// +build rpctest package main import ( "bytes" "crypto/rand" "crypto/sha256" "encoding/hex" "fmt" "io" "io/ioutil" "math" "os" "path/filepath" "reflect" "strings" "sync/atomic" "testing" "time" "github.com/btcsuite/btcd/btcjson" "github.com/btcsuite/btcd/chaincfg" "github.com/btcsuite/btcd/chaincfg/chainhash" "github.com/btcsuite/btcd/integration/rpctest" "github.com/btcsuite/btcd/rpcclient" "github.com/btcsuite/btcd/wire" "github.com/btcsuite/btcutil" "github.com/davecgh/go-spew/spew" "github.com/go-errors/errors" "github.com/lightningnetwork/lnd/lnrpc" "github.com/lightningnetwork/lnd/lntest" "github.com/lightningnetwork/lnd/lnwire" "golang.org/x/net/context" "google.golang.org/grpc" ) var ( harnessNetParams = &chaincfg.SimNetParams ) const ( testFeeBase = 1e+6 defaultCSV = lntest.DefaultCSV defaultTimeout = lntest.DefaultTimeout minerMempoolTimeout = lntest.MinerMempoolTimeout channelOpenTimeout = lntest.ChannelOpenTimeout channelCloseTimeout = lntest.ChannelCloseTimeout ) // harnessTest wraps a regular testing.T providing enhanced error detection // and propagation. All error will be augmented with a full stack-trace in // order to aid in debugging. Additionally, any panics caused by active // test cases will also be handled and represented as fatals. type harnessTest struct { t *testing.T // testCase is populated during test execution and represents the // current test case. testCase *testCase } // newHarnessTest creates a new instance of a harnessTest from a regular // testing.T instance. func newHarnessTest(t *testing.T) *harnessTest { return &harnessTest{t, nil} } // Fatalf causes the current active test case to fail with a fatal error. All // integration tests should mark test failures solely with this method due to // the error stack traces it produces. func (h *harnessTest) Fatalf(format string, a ...interface{}) { stacktrace := errors.Wrap(fmt.Sprintf(format, a...), 1).ErrorStack() if h.testCase != nil { h.t.Fatalf("Failed: (%v): exited with error: \n"+ "%v", h.testCase.name, stacktrace) } else { h.t.Fatalf("Error outside of test: %v", stacktrace) } } // RunTestCase executes a harness test case. Any errors or panics will be // represented as fatal. func (h *harnessTest) RunTestCase(testCase *testCase, net *lntest.NetworkHarness) { h.testCase = testCase defer func() { h.testCase = nil }() defer func() { if err := recover(); err != nil { description := errors.Wrap(err, 2).ErrorStack() h.t.Fatalf("Failed: (%v) panicked with: \n%v", h.testCase.name, description) } }() testCase.test(net, h) return } func (h *harnessTest) Logf(format string, args ...interface{}) { h.t.Logf(format, args...) } func (h *harnessTest) Log(args ...interface{}) { h.t.Log(args...) } func assertTxInBlock(t *harnessTest, block *wire.MsgBlock, txid *chainhash.Hash) { for _, tx := range block.Transactions { sha := tx.TxHash() if bytes.Equal(txid[:], sha[:]) { return } } t.Fatalf("tx was not included in block") } // mineBlocks mine 'num' of blocks and check that blocks are present in // node blockchain. numTxs should be set to the number of transactions // (excluding the coinbase) we expect to be included in the first mined block. func mineBlocks(t *harnessTest, net *lntest.NetworkHarness, num uint32, numTxs int) []*wire.MsgBlock { // If we expect transactions to be included in the blocks we'll mine, // we wait here until they are seen in the miner's mempool. var txids []*chainhash.Hash var err error if numTxs > 0 { txids, err = waitForNTxsInMempool( net.Miner.Node, numTxs, minerMempoolTimeout, ) if err != nil { t.Fatalf("unable to find txns in mempool: %v", err) } } blocks := make([]*wire.MsgBlock, num) blockHashes, err := net.Miner.Node.Generate(num) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } for i, blockHash := range blockHashes { block, err := net.Miner.Node.GetBlock(blockHash) if err != nil { t.Fatalf("unable to get block: %v", err) } blocks[i] = block } // Finally, assert that all the transactions were included in the first // block. for _, txid := range txids { assertTxInBlock(t, blocks[0], txid) } return blocks } // openChannelAndAssert attempts to open a channel with the specified // parameters extended from Alice to Bob. Additionally, two items are asserted // after the channel is considered open: the funding transaction should be // found within a block, and that Alice can report the status of the new // channel. func openChannelAndAssert(ctx context.Context, t *harnessTest, net *lntest.NetworkHarness, alice, bob *lntest.HarnessNode, p lntest.OpenChannelParams) *lnrpc.ChannelPoint { chanOpenUpdate, err := net.OpenChannel( ctx, alice, bob, p, ) if err != nil { t.Fatalf("unable to open channel: %v", err) } // Mine 6 blocks, then wait for Alice's node to notify us that the // channel has been opened. The funding transaction should be found // within the first newly mined block. We mine 6 blocks so that in the // case that the channel is public, it is announced to the network. block := mineBlocks(t, net, 6, 1)[0] fundingChanPoint, err := net.WaitForChannelOpen(ctx, chanOpenUpdate) if err != nil { t.Fatalf("error while waiting for channel open: %v", err) } txidHash, err := getChanPointFundingTxid(fundingChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } fundingTxID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } assertTxInBlock(t, block, fundingTxID) // The channel should be listed in the peer information returned by // both peers. chanPoint := wire.OutPoint{ Hash: *fundingTxID, Index: fundingChanPoint.OutputIndex, } if err := net.AssertChannelExists(ctx, alice, &chanPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } if err := net.AssertChannelExists(ctx, bob, &chanPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } return fundingChanPoint } // closeChannelAndAssert attempts to close a channel identified by the passed // channel point owned by the passed Lightning node. A fully blocking channel // closure is attempted, therefore the passed context should be a child derived // via timeout from a base parent. Additionally, once the channel has been // detected as closed, an assertion checks that the transaction is found within // a block. func closeChannelAndAssert(ctx context.Context, t *harnessTest, net *lntest.NetworkHarness, node *lntest.HarnessNode, fundingChanPoint *lnrpc.ChannelPoint, force bool) *chainhash.Hash { closeUpdates, _, err := net.CloseChannel(ctx, node, fundingChanPoint, force) if err != nil { t.Fatalf("unable to close channel: %v", err) } txidHash, err := getChanPointFundingTxid(fundingChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to convert to chainhash: %v", err) } chanPointStr := fmt.Sprintf("%v:%v", txid, fundingChanPoint.OutputIndex) // At this point, the channel should now be marked as being in the // state of "waiting close". pendingChansRequest := &lnrpc.PendingChannelsRequest{} pendingChanResp, err := node.PendingChannels(ctx, pendingChansRequest) if err != nil { t.Fatalf("unable to query for pending channels: %v", err) } var found bool for _, pendingClose := range pendingChanResp.WaitingCloseChannels { if pendingClose.Channel.ChannelPoint == chanPointStr { found = true break } } if !found { t.Fatalf("channel not marked as waiting close") } // We'll now, generate a single block, wait for the final close status // update, then ensure that the closing transaction was included in the // block. block := mineBlocks(t, net, 1, 1)[0] closingTxid, err := net.WaitForChannelClose(ctx, closeUpdates) if err != nil { t.Fatalf("error while waiting for channel close: %v", err) } assertTxInBlock(t, block, closingTxid) // Finally, the transaction should no longer be in the waiting close // state as we've just mined a block that should include the closing // transaction. err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} pendingChanResp, err := node.PendingChannels( ctx, pendingChansRequest, ) if err != nil { return false } for _, pendingClose := range pendingChanResp.WaitingCloseChannels { if pendingClose.Channel.ChannelPoint == chanPointStr { return false } } return true }, time.Second*15) if err != nil { t.Fatalf("closing transaction not marked as fully closed") } return closingTxid } // waitForChannelPendingForceClose waits for the node to report that the // channel is pending force close, and that the UTXO nursery is aware of it. func waitForChannelPendingForceClose(ctx context.Context, node *lntest.HarnessNode, fundingChanPoint *lnrpc.ChannelPoint) error { txidHash, err := getChanPointFundingTxid(fundingChanPoint) if err != nil { return err } txid, err := chainhash.NewHash(txidHash) if err != nil { return err } op := wire.OutPoint{ Hash: *txid, Index: fundingChanPoint.OutputIndex, } var predErr error err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} pendingChanResp, err := node.PendingChannels( ctx, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to get pending "+ "channels: %v", err) return false } forceClose, err := findForceClosedChannel(pendingChanResp, &op) if err != nil { predErr = err return false } // We must wait until the UTXO nursery has received the channel // and is aware of its maturity height. if forceClose.MaturityHeight == 0 { predErr = fmt.Errorf("channel had maturity height of 0") return false } return true }, time.Second*15) if err != nil { return predErr } return nil } // cleanupForceClose mines a force close commitment found in the mempool and // the following sweep transaction from the force closing node. func cleanupForceClose(t *harnessTest, net *lntest.NetworkHarness, node *lntest.HarnessNode, chanPoint *lnrpc.ChannelPoint) { ctxb := context.Background() // Wait for the channel to be marked pending force close. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err := waitForChannelPendingForceClose(ctxt, node, chanPoint) if err != nil { t.Fatalf("channel not pending force close: %v", err) } // Mine enough blocks for the node to sweep its funds from the force // closed channel. _, err = net.Miner.Node.Generate(defaultCSV) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } // The node should now sweep the funds, clean up by mining the sweeping // tx. mineBlocks(t, net, 1, 1) } // numOpenChannelsPending sends an RPC request to a node to get a count of the // node's channels that are currently in a pending state (with a broadcast, but // not confirmed funding transaction). func numOpenChannelsPending(ctxt context.Context, node *lntest.HarnessNode) (int, error) { pendingChansRequest := &lnrpc.PendingChannelsRequest{} resp, err := node.PendingChannels(ctxt, pendingChansRequest) if err != nil { return 0, err } return len(resp.PendingOpenChannels), nil } // assertNumOpenChannelsPending asserts that a pair of nodes have the expected // number of pending channels between them. func assertNumOpenChannelsPending(ctxt context.Context, t *harnessTest, alice, bob *lntest.HarnessNode, expected int) { const nPolls = 10 ticker := time.NewTicker(200 * time.Millisecond) defer ticker.Stop() for i := 0; i < nPolls; i++ { aliceNumChans, err := numOpenChannelsPending(ctxt, alice) if err != nil { t.Fatalf("error fetching alice's node (%v) pending channels %v", alice.NodeID, err) } bobNumChans, err := numOpenChannelsPending(ctxt, bob) if err != nil { t.Fatalf("error fetching bob's node (%v) pending channels %v", bob.NodeID, err) } isLastIteration := i == nPolls-1 aliceStateCorrect := aliceNumChans == expected if !aliceStateCorrect && isLastIteration { t.Fatalf("number of pending channels for alice incorrect. "+ "expected %v, got %v", expected, aliceNumChans) } bobStateCorrect := bobNumChans == expected if !bobStateCorrect && isLastIteration { t.Fatalf("number of pending channels for bob incorrect. "+ "expected %v, got %v", expected, bobNumChans) } if aliceStateCorrect && bobStateCorrect { return } <-ticker.C } } // assertNumConnections asserts number current connections between two peers. func assertNumConnections(t *harnessTest, alice, bob *lntest.HarnessNode, expected int) { ctxb := context.Background() const nPolls = 10 tick := time.NewTicker(300 * time.Millisecond) defer tick.Stop() for i := nPolls - 1; i >= 0; i-- { select { case <-tick.C: ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) aNumPeers, err := alice.ListPeers(ctxt, &lnrpc.ListPeersRequest{}) if err != nil { t.Fatalf("unable to fetch alice's node (%v) list peers %v", alice.NodeID, err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bNumPeers, err := bob.ListPeers(ctxt, &lnrpc.ListPeersRequest{}) if err != nil { t.Fatalf("unable to fetch bob's node (%v) list peers %v", bob.NodeID, err) } if len(aNumPeers.Peers) != expected { // Continue polling if this is not the final // loop. if i > 0 { continue } t.Fatalf("number of peers connected to alice is incorrect: "+ "expected %v, got %v", expected, len(aNumPeers.Peers)) } if len(bNumPeers.Peers) != expected { // Continue polling if this is not the final // loop. if i > 0 { continue } t.Fatalf("number of peers connected to bob is incorrect: "+ "expected %v, got %v", expected, len(bNumPeers.Peers)) } // Alice and Bob both have the required number of // peers, stop polling and return to caller. return } } } // shutdownAndAssert shuts down the given node and asserts that no errors // occur. func shutdownAndAssert(net *lntest.NetworkHarness, t *harnessTest, node *lntest.HarnessNode) { if err := net.ShutdownNode(node); err != nil { t.Fatalf("unable to shutdown %v: %v", node.Name(), err) } } // calcStaticFee calculates appropriate fees for commitment transactions. This // function provides a simple way to allow test balance assertions to take fee // calculations into account. // // TODO(bvu): Refactor when dynamic fee estimation is added. // TODO(conner) remove code duplication func calcStaticFee(numHTLCs int) btcutil.Amount { const ( commitWeight = btcutil.Amount(724) htlcWeight = 172 feePerKw = btcutil.Amount(50 * 1000 / 4) ) return feePerKw * (commitWeight + btcutil.Amount(htlcWeight*numHTLCs)) / 1000 } // completePaymentRequests sends payments from a lightning node to complete all // payment requests. If the awaitResponse parameter is true, this function // does not return until all payments successfully complete without errors. func completePaymentRequests(ctx context.Context, client lnrpc.LightningClient, paymentRequests []string, awaitResponse bool) error { ctx, cancel := context.WithCancel(ctx) defer cancel() payStream, err := client.SendPayment(ctx) if err != nil { return err } for _, payReq := range paymentRequests { sendReq := &lnrpc.SendRequest{PaymentRequest: payReq} err := payStream.Send(sendReq) if err != nil { return err } } if awaitResponse { for range paymentRequests { resp, err := payStream.Recv() if err != nil { return err } if resp.PaymentError != "" { return fmt.Errorf("received payment error: %v", resp.PaymentError) } } } else { // We are not waiting for feedback in the form of a response, but we // should still wait long enough for the server to receive and handle // the send before cancelling the request. time.Sleep(200 * time.Millisecond) } return nil } // makeFakePayHash creates random pre image hash func makeFakePayHash(t *harnessTest) []byte { randBuf := make([]byte, 32) if _, err := rand.Read(randBuf); err != nil { t.Fatalf("internal error, cannot generate random string: %v", err) } return randBuf } // createPayReqs is a helper method that will create a slice of payment // requests for the given node. func createPayReqs(ctx context.Context, node *lntest.HarnessNode, paymentAmt btcutil.Amount, numInvoices int) ([]string, [][]byte, []*lnrpc.Invoice, error) { payReqs := make([]string, numInvoices) rHashes := make([][]byte, numInvoices) invoices := make([]*lnrpc.Invoice, numInvoices) for i := 0; i < numInvoices; i++ { preimage := make([]byte, 32) _, err := rand.Read(preimage) if err != nil { return nil, nil, nil, fmt.Errorf("unable to generate "+ "preimage: %v", err) } invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: preimage, Value: int64(paymentAmt), } resp, err := node.AddInvoice(ctx, invoice) if err != nil { return nil, nil, nil, fmt.Errorf("unable to add "+ "invoice: %v", err) } payReqs[i] = resp.PaymentRequest rHashes[i] = resp.RHash invoices[i] = invoice } return payReqs, rHashes, invoices, nil } // getChanInfo is a helper method for getting channel info for a node's sole // channel. func getChanInfo(ctx context.Context, node *lntest.HarnessNode) ( *lnrpc.Channel, error) { req := &lnrpc.ListChannelsRequest{} channelInfo, err := node.ListChannels(ctx, req) if err != nil { return nil, err } if len(channelInfo.Channels) != 1 { return nil, fmt.Errorf("node should only have a single "+ "channel, instead he has %v", len(channelInfo.Channels)) } return channelInfo.Channels[0], nil } const ( AddrTypeWitnessPubkeyHash = lnrpc.AddressType_WITNESS_PUBKEY_HASH AddrTypeNestedPubkeyHash = lnrpc.AddressType_NESTED_PUBKEY_HASH ) // testOnchainFundRecovery checks lnd's ability to rescan for onchain outputs // when providing a valid aezeed that owns outputs on the chain. This test // performs multiple restorations using the same seed and various recovery // windows to ensure we detect funds properly. func testOnchainFundRecovery(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, create a new node with strong passphrase and grab the mnemonic // used for key derivation. This will bring up Carol with an empty // wallet, and such that she is synced up. password := []byte("The Magic Words are Squeamish Ossifrage") carol, mnemonic, err := net.NewNodeWithSeed("Carol", nil, password) if err != nil { t.Fatalf("unable to create node with seed; %v", err) } shutdownAndAssert(net, t, carol) // Create a closure for testing the recovery of Carol's wallet. This // method takes the expected value of Carol's balance when using the // given recovery window. Additionally, the caller can specify an action // to perform on the restored node before the node is shutdown. restoreCheckBalance := func(expAmount int64, expectedNumUTXOs int, recoveryWindow int32, fn func(*lntest.HarnessNode)) { // Restore Carol, passing in the password, mnemonic, and // desired recovery window. node, err := net.RestoreNodeWithSeed( "Carol", nil, password, mnemonic, recoveryWindow, ) if err != nil { t.Fatalf("unable to restore node: %v", err) } // Query carol for her current wallet balance, and also that we // gain the expected number of UTXOs. var ( currBalance int64 currNumUTXOs uint32 ) err = lntest.WaitPredicate(func() bool { req := &lnrpc.WalletBalanceRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) resp, err := node.WalletBalance(ctxt, req) if err != nil { t.Fatalf("unable to query wallet balance: %v", err) } // Verify that Carol's balance matches our expected // amount. currBalance = resp.ConfirmedBalance if expAmount != currBalance { return false } utxoReq := &lnrpc.ListUnspentRequest{ MaxConfs: math.MaxInt32, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) utxoResp, err := node.ListUnspent(ctxt, utxoReq) if err != nil { t.Fatalf("unable to query utxos: %v", err) } currNumUTXOs := len(utxoResp.Utxos) if currNumUTXOs != expectedNumUTXOs { return false } return true }, 15*time.Second) if err != nil { t.Fatalf("expected restored node to have %d satoshis, "+ "instead has %d satoshis, expected %d utxos "+ "instead has %d", expAmount, currBalance, expectedNumUTXOs, currNumUTXOs) } // If the user provided a callback, execute the commands against // the restored Carol. if fn != nil { fn(node) } // Lastly, shutdown this Carol so we can move on to the next // restoration. shutdownAndAssert(net, t, node) } // Create a closure-factory for building closures that can generate and // skip a configurable number of addresses, before finally sending coins // to a next generated address. The returned closure will apply the same // behavior to both default P2WKH and NP2WKH scopes. skipAndSend := func(nskip int) func(*lntest.HarnessNode) { return func(node *lntest.HarnessNode) { newP2WKHAddrReq := &lnrpc.NewAddressRequest{ Type: AddrTypeWitnessPubkeyHash, } newNP2WKHAddrReq := &lnrpc.NewAddressRequest{ Type: AddrTypeNestedPubkeyHash, } // Generate and skip the number of addresses requested. for i := 0; i < nskip; i++ { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) _, err = node.NewAddress(ctxt, newP2WKHAddrReq) if err != nil { t.Fatalf("unable to generate new "+ "p2wkh address: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, err = node.NewAddress(ctxt, newNP2WKHAddrReq) if err != nil { t.Fatalf("unable to generate new "+ "np2wkh address: %v", err) } } // Send one BTC to the next P2WKH address. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins( ctxt, btcutil.SatoshiPerBitcoin, node, ) if err != nil { t.Fatalf("unable to send coins to node: %v", err) } // And another to the next NP2WKH address. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoinsNP2WKH( ctxt, btcutil.SatoshiPerBitcoin, node, ) if err != nil { t.Fatalf("unable to send coins to node: %v", err) } } } // Restore Carol with a recovery window of 0. Since no coins have been // sent, her balance should be zero. // // After, one BTC is sent to both her first external P2WKH and NP2WKH // addresses. restoreCheckBalance(0, 0, 0, skipAndSend(0)) // Check that restoring without a look-ahead results in having no funds // in the wallet, even though they exist on-chain. restoreCheckBalance(0, 0, 0, nil) // Now, check that using a look-ahead of 1 recovers the balance from // the two transactions above. We should also now have 2 UTXOs in the // wallet at the end of the recovery attempt. // // After, we will generate and skip 9 P2WKH and NP2WKH addresses, and // send another BTC to the subsequent 10th address in each derivation // path. restoreCheckBalance(2*btcutil.SatoshiPerBitcoin, 2, 1, skipAndSend(9)) // Check that using a recovery window of 9 does not find the two most // recent txns. restoreCheckBalance(2*btcutil.SatoshiPerBitcoin, 2, 9, nil) // Extending our recovery window to 10 should find the most recent // transactions, leaving the wallet with 4 BTC total. We should also // learn of the two additional UTXOs created above. // // After, we will skip 19 more addrs, sending to the 20th address past // our last found address, and repeat the same checks. restoreCheckBalance(4*btcutil.SatoshiPerBitcoin, 4, 10, skipAndSend(19)) // Check that recovering with a recovery window of 19 fails to find the // most recent transactions. restoreCheckBalance(4*btcutil.SatoshiPerBitcoin, 4, 19, nil) // Ensure that using a recovery window of 20 succeeds with all UTXOs // found and the final balance reflected. restoreCheckBalance(6*btcutil.SatoshiPerBitcoin, 6, 20, nil) } // testBasicChannelFunding performs a test exercising expected behavior from a // basic funding workflow. The test creates a new channel between Alice and // Bob, then immediately closes the channel after asserting some expected post // conditions. Finally, the chain itself is checked to ensure the closing // transaction was mined. func testBasicChannelFunding(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() chanAmt := maxBtcFundingAmount pushAmt := btcutil.Amount(100000) // First establish a channel with a capacity of 0.5 BTC between Alice // and Bob with Alice pushing 100k satoshis to Bob's side during // funding. This function will block until the channel itself is fully // open or an error occurs in the funding process. A series of // assertions will be executed to ensure the funding process completed // successfully. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } // With the channel open, ensure that the amount specified above has // properly been pushed to Bob. balReq := &lnrpc.ChannelBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceBal, err := net.Alice.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get alice's balance: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobBal, err := net.Bob.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get bobs's balance: %v", err) } if aliceBal.Balance != int64(chanAmt-pushAmt-calcStaticFee(0)) { t.Fatalf("alice's balance is incorrect: expected %v got %v", chanAmt-pushAmt-calcStaticFee(0), aliceBal) } if bobBal.Balance != int64(pushAmt) { t.Fatalf("bob's balance is incorrect: expected %v got %v", pushAmt, bobBal.Balance) } // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // testUnconfirmedChannelFunding tests that unconfirmed outputs that pay to us // can be used to fund channels. func testUnconfirmedChannelFunding(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = maxBtcFundingAmount pushAmt = btcutil.Amount(100000) ) // We'll start off by creating a node for Carol. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) // We'll send her some funds that should not confirm. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoinsUnconfirmed(ctxt, 2*chanAmt, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } // Make sure the unconfirmed tx is seen in the mempool. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to find tx in miner mempool: %v", err) } // Now, we'll connect her to Alice so that they can open a channel // together. The funding flow should select Carol's unconfirmed output // as she doesn't have any other funds since it's a new node. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanOpenUpdate, err := net.OpenChannel( ctxt, carol, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, SpendUnconfirmed: true, }, ) if err != nil { t.Fatalf("unable to open channel between carol and alice: %v", err) } // Confirm the channel and wait for it to be recognized by both // parties. Two transactions should be mined, the unconfirmed spend and // the funding tx. mineBlocks(t, net, 6, 2) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanPoint, err := net.WaitForChannelOpen(ctxt, chanOpenUpdate) if err != nil { t.Fatalf("error while waiting for channel open: %v", err) } // With the channel open, we'll check the balances on each side of the // channel as a sanity check to ensure things worked out as intended. balReq := &lnrpc.ChannelBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBal, err := carol.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceBal, err := net.Alice.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get alice's balance: %v", err) } if carolBal.Balance != int64(chanAmt-pushAmt-calcStaticFee(0)) { t.Fatalf("carol's balance is incorrect: expected %v got %v", chanAmt-pushAmt-calcStaticFee(0), carolBal) } if aliceBal.Balance != int64(pushAmt) { t.Fatalf("alice's balance is incorrect: expected %v got %v", pushAmt, aliceBal.Balance) } // Now that we're done with the test, the channel can be closed. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPoint, false) } // txStr returns the string representation of the channel's funding transaction. func txStr(chanPoint *lnrpc.ChannelPoint) string { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { return "" } fundingTxID, err := chainhash.NewHash(txidHash) if err != nil { return "" } cp := wire.OutPoint{ Hash: *fundingTxID, Index: chanPoint.OutputIndex, } return cp.String() } // expectedChanUpdate houses params we expect a ChannelUpdate to advertise. type expectedChanUpdate struct { advertisingNode string expectedPolicy *lnrpc.RoutingPolicy chanPoint *lnrpc.ChannelPoint } // waitForChannelUpdate waits for a node to receive the expected channel // updates. func waitForChannelUpdate(t *harnessTest, subscription graphSubscription, expUpdates []expectedChanUpdate) { // Create an array indicating which expected channel updates we have // received. found := make([]bool, len(expUpdates)) out: for { select { case graphUpdate := <-subscription.updateChan: for _, update := range graphUpdate.ChannelUpdates { // For each expected update, check if it matches // the update we just received. for i, exp := range expUpdates { fundingTxStr := txStr(update.ChanPoint) if fundingTxStr != txStr(exp.chanPoint) { continue } if update.AdvertisingNode != exp.advertisingNode { continue } err := checkChannelPolicy( update.RoutingPolicy, exp.expectedPolicy, ) if err != nil { continue } // We got a policy update that matched // the values and channel point of what // we expected, mark it as found. found[i] = true // If we have no more channel updates // we are waiting for, break out of the // loop. rem := 0 for _, f := range found { if !f { rem++ } } if rem == 0 { break out } // Since we found a match among the // expected updates, break out of the // inner loop. break } } case err := <-subscription.errChan: t.Fatalf("unable to recv graph update: %v", err) case <-time.After(20 * time.Second): t.Fatalf("did not receive channel update") } } } // assertChannelPolicy asserts that the passed node's known channel policy for // the passed chanPoint is consistent with the expected policy values. func assertChannelPolicy(t *harnessTest, node *lntest.HarnessNode, advertisingNode string, expectedPolicy *lnrpc.RoutingPolicy, chanPoints ...*lnrpc.ChannelPoint) { ctxb := context.Background() descReq := &lnrpc.ChannelGraphRequest{ IncludeUnannounced: true, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) chanGraph, err := node.DescribeGraph(ctxt, descReq) if err != nil { t.Fatalf("unable to query for alice's graph: %v", err) } out: for _, chanPoint := range chanPoints { for _, e := range chanGraph.Edges { if e.ChanPoint != txStr(chanPoint) { continue } var err error if e.Node1Pub == advertisingNode { err = checkChannelPolicy( e.Node1Policy, expectedPolicy, ) } else { err = checkChannelPolicy( e.Node2Policy, expectedPolicy, ) } if err != nil { t.Fatalf(err.Error()) } continue out } // If we've iterated over all the known edges and we weren't // able to find this specific one, then we'll fail. t.Fatalf("did not find edge %v", txStr(chanPoint)) } } // checkChannelPolicy checks that the policy matches the expected one. func checkChannelPolicy(policy, expectedPolicy *lnrpc.RoutingPolicy) error { if policy.FeeBaseMsat != expectedPolicy.FeeBaseMsat { return fmt.Errorf("expected base fee %v, got %v", expectedPolicy.FeeBaseMsat, policy.FeeBaseMsat) } if policy.FeeRateMilliMsat != expectedPolicy.FeeRateMilliMsat { return fmt.Errorf("expected fee rate %v, got %v", expectedPolicy.FeeRateMilliMsat, policy.FeeRateMilliMsat) } if policy.TimeLockDelta != expectedPolicy.TimeLockDelta { return fmt.Errorf("expected time lock delta %v, got %v", expectedPolicy.TimeLockDelta, policy.TimeLockDelta) } if policy.MinHtlc != expectedPolicy.MinHtlc { return fmt.Errorf("expected min htlc %v, got %v", expectedPolicy.MinHtlc, policy.MinHtlc) } if policy.Disabled != expectedPolicy.Disabled { return errors.New("edge should be disabled but isn't") } return nil } // testUpdateChannelPolicy tests that policy updates made to a channel // gets propagated to other nodes in the network. func testUpdateChannelPolicy(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( defaultFeeBase = 1000 defaultFeeRate = 1 defaultTimeLockDelta = 144 defaultMinHtlc = 1000 ) // Launch notification clients for all nodes, such that we can // get notified when they discover new channels and updates in the // graph. aliceSub := subscribeGraphNotifications(t, ctxb, net.Alice) defer close(aliceSub.quit) bobSub := subscribeGraphNotifications(t, ctxb, net.Bob) defer close(bobSub.quit) chanAmt := maxBtcFundingAmount pushAmt := chanAmt / 2 // Create a channel Alice->Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) // We add all the nodes' update channels to a slice, such that we can // make sure they all receive the expected updates. graphSubs := []graphSubscription{aliceSub, bobSub} nodes := []*lntest.HarnessNode{net.Alice, net.Bob} // Alice and Bob should see each other's ChannelUpdates, advertising the // default routing policies. expectedPolicy := &lnrpc.RoutingPolicy{ FeeBaseMsat: defaultFeeBase, FeeRateMilliMsat: defaultFeeRate, TimeLockDelta: defaultTimeLockDelta, MinHtlc: defaultMinHtlc, } for _, graphSub := range graphSubs { waitForChannelUpdate( t, graphSub, []expectedChanUpdate{ {net.Alice.PubKeyStr, expectedPolicy, chanPoint}, {net.Bob.PubKeyStr, expectedPolicy, chanPoint}, }, ) } // They should now know about the default policies. for _, node := range nodes { assertChannelPolicy( t, node, net.Alice.PubKeyStr, expectedPolicy, chanPoint, ) assertChannelPolicy( t, node, net.Bob.PubKeyStr, expectedPolicy, chanPoint, ) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } // Create Carol and a new channel Bob->Carol. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) carolSub := subscribeGraphNotifications(t, ctxb, carol) defer close(carolSub.quit) graphSubs = append(graphSubs, carolSub) nodes = append(nodes, carol) // Send some coins to Carol that can be used for channel funding. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } if err := net.ConnectNodes(ctxb, carol, net.Bob); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } // Open the channel Carol->Bob with a custom min_htlc value set. Since // Carol is opening the channel, she will require Bob to not forward // HTLCs smaller than this value, and hence he should advertise it as // part of his ChannelUpdate. const customMinHtlc = 5000 ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint2 := openChannelAndAssert( ctxt, t, net, carol, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, MinHtlc: customMinHtlc, }, ) expectedPolicyBob := &lnrpc.RoutingPolicy{ FeeBaseMsat: defaultFeeBase, FeeRateMilliMsat: defaultFeeRate, TimeLockDelta: defaultTimeLockDelta, MinHtlc: customMinHtlc, } expectedPolicyCarol := &lnrpc.RoutingPolicy{ FeeBaseMsat: defaultFeeBase, FeeRateMilliMsat: defaultFeeRate, TimeLockDelta: defaultTimeLockDelta, MinHtlc: defaultMinHtlc, } for _, graphSub := range graphSubs { waitForChannelUpdate( t, graphSub, []expectedChanUpdate{ {net.Bob.PubKeyStr, expectedPolicyBob, chanPoint2}, {carol.PubKeyStr, expectedPolicyCarol, chanPoint2}, }, ) } // Check that all nodes now know about the updated policies. for _, node := range nodes { assertChannelPolicy( t, node, net.Bob.PubKeyStr, expectedPolicyBob, chanPoint2, ) assertChannelPolicy( t, node, carol.PubKeyStr, expectedPolicyCarol, chanPoint2, ) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint2) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint2) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint2) if err != nil { t.Fatalf("carol didn't report channel: %v", err) } // First we'll try to send a payment from Alice to Carol with an amount // less than the min_htlc value required by Carol. This payment should // fail, as the channel Bob->Carol cannot carry HTLCs this small. payAmt := btcutil.Amount(4) invoice := &lnrpc.Invoice{ Memo: "testing", Value: int64(payAmt), } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := carol.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, net.Alice, []string{resp.PaymentRequest}, true, ) // Alice knows about the channel policy of Carol and should therefore // not be able to find a path during routing. if err == nil || !strings.Contains(err.Error(), "unable to find a path") { t.Fatalf("expected payment to fail, instead got %v", err) } // Now we try to send a payment over the channel with a value too low // to be accepted. First we query for a route to route a payment of // 5000 mSAT, as this is accepted. payAmt = btcutil.Amount(5) routesReq := &lnrpc.QueryRoutesRequest{ PubKey: carol.PubKeyStr, Amt: int64(payAmt), NumRoutes: 1, FinalCltvDelta: 144, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) routes, err := net.Alice.QueryRoutes(ctxt, routesReq) if err != nil { t.Fatalf("unable to get route: %v", err) } if len(routes.Routes) != 1 { t.Fatalf("expected to find 1 route, got %v", len(routes.Routes)) } // We change the route to carry a payment of 4000 mSAT instead of 5000 // mSAT. payAmt = btcutil.Amount(4) amtSat := int64(payAmt) amtMSat := int64(lnwire.NewMSatFromSatoshis(payAmt)) routes.Routes[0].Hops[0].AmtToForward = amtSat routes.Routes[0].Hops[0].AmtToForwardMsat = amtMSat routes.Routes[0].Hops[1].AmtToForward = amtSat routes.Routes[0].Hops[1].AmtToForwardMsat = amtMSat // Send the payment with the modified value. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayStream, err := net.Alice.SendToRoute(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } sendReq := &lnrpc.SendToRouteRequest{ PaymentHash: resp.RHash, Routes: routes.Routes, } err = alicePayStream.Send(sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } // We expect this payment to fail, and that the min_htlc value is // communicated back to us, since the attempted HTLC value was too low. sendResp, err := alicePayStream.Recv() if err != nil { t.Fatalf("unable to send payment: %v", err) } // Expected as part of the error message. substrs := []string{ "AmountBelowMinimum", "HtlcMinimumMsat: (lnwire.MilliSatoshi) 5000 mSAT", } for _, s := range substrs { if !strings.Contains(sendResp.PaymentError, s) { t.Fatalf("expected error to contain \"%v\", instead "+ "got %v", s, sendResp.PaymentError) } } // Make sure sending using the original value succeeds. payAmt = btcutil.Amount(5) amtSat = int64(payAmt) amtMSat = int64(lnwire.NewMSatFromSatoshis(payAmt)) routes.Routes[0].Hops[0].AmtToForward = amtSat routes.Routes[0].Hops[0].AmtToForwardMsat = amtMSat routes.Routes[0].Hops[1].AmtToForward = amtSat routes.Routes[0].Hops[1].AmtToForwardMsat = amtMSat sendReq = &lnrpc.SendToRouteRequest{ PaymentHash: resp.RHash, Routes: routes.Routes, } err = alicePayStream.Send(sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } sendResp, err = alicePayStream.Recv() if err != nil { t.Fatalf("unable to send payment: %v", err) } if sendResp.PaymentError != "" { t.Fatalf("expected payment to succeed, instead got %v", sendResp.PaymentError) } // With our little cluster set up, we'll update the fees for the // channel Bob side of the Alice->Bob channel, and make sure all nodes // learn about it. baseFee := int64(1500) feeRate := int64(12) timeLockDelta := uint32(66) expectedPolicy = &lnrpc.RoutingPolicy{ FeeBaseMsat: baseFee, FeeRateMilliMsat: testFeeBase * feeRate, TimeLockDelta: timeLockDelta, MinHtlc: defaultMinHtlc, } req := &lnrpc.PolicyUpdateRequest{ BaseFeeMsat: baseFee, FeeRate: float64(feeRate), TimeLockDelta: timeLockDelta, Scope: &lnrpc.PolicyUpdateRequest_ChanPoint{ ChanPoint: chanPoint, }, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if _, err := net.Bob.UpdateChannelPolicy(ctxt, req); err != nil { t.Fatalf("unable to get alice's balance: %v", err) } // Wait for all nodes to have seen the policy update done by Bob. for _, graphSub := range graphSubs { waitForChannelUpdate( t, graphSub, []expectedChanUpdate{ {net.Bob.PubKeyStr, expectedPolicy, chanPoint}, }, ) } // Check that all nodes now know about Bob's updated policy. for _, node := range nodes { assertChannelPolicy( t, node, net.Bob.PubKeyStr, expectedPolicy, chanPoint, ) } // Now that all nodes have received the new channel update, we'll try // to send a payment from Alice to Carol to ensure that Alice has // internalized this fee update. This shouldn't affect the route that // Alice takes though: we updated the Alice -> Bob channel and she // doesn't pay for transit over that channel as it's direct. // Note that the payment amount is >= the min_htlc value for the // channel Bob->Carol, so it should successfully be forwarded. payAmt = btcutil.Amount(5) invoice = &lnrpc.Invoice{ Memo: "testing", Value: int64(payAmt), } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err = carol.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, net.Alice, []string{resp.PaymentRequest}, true, ) if err != nil { t.Fatalf("unable to send payment: %v", err) } // We'll now open a channel from Alice directly to Carol. if err := net.ConnectNodes(ctxb, net.Alice, carol); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint3 := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint3) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint3) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } // Make a global update, and check that both channels' new policies get // propagated. baseFee = int64(800) feeRate = int64(123) timeLockDelta = uint32(22) expectedPolicy.FeeBaseMsat = baseFee expectedPolicy.FeeRateMilliMsat = testFeeBase * feeRate expectedPolicy.TimeLockDelta = timeLockDelta req = &lnrpc.PolicyUpdateRequest{ BaseFeeMsat: baseFee, FeeRate: float64(feeRate), TimeLockDelta: timeLockDelta, } req.Scope = &lnrpc.PolicyUpdateRequest_Global{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, err = net.Alice.UpdateChannelPolicy(ctxt, req) if err != nil { t.Fatalf("unable to get alice's balance: %v", err) } // Wait for all nodes to have seen the policy updates for both of // Alice's channels. for _, graphSub := range graphSubs { waitForChannelUpdate( t, graphSub, []expectedChanUpdate{ {net.Alice.PubKeyStr, expectedPolicy, chanPoint}, {net.Alice.PubKeyStr, expectedPolicy, chanPoint3}, }, ) } // And finally check that all nodes remembers the policy update they // received. for _, node := range nodes { assertChannelPolicy( t, node, net.Alice.PubKeyStr, expectedPolicy, chanPoint, chanPoint3, ) } // Close the channels. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPoint2, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint3, false) } // waitForNodeBlockHeight queries the node for its current block height until // it reaches the passed height. func waitForNodeBlockHeight(ctx context.Context, node *lntest.HarnessNode, height int32) error { var predErr error err := lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctx, 10*time.Second) info, err := node.GetInfo(ctxt, &lnrpc.GetInfoRequest{}) if err != nil { predErr = err return false } if int32(info.BlockHeight) != height { predErr = fmt.Errorf("expected block height to "+ "be %v, was %v", height, info.BlockHeight) return false } return true }, 15*time.Second) if err != nil { return predErr } return nil } // assertMinerBlockHeightDelta ensures that tempMiner is 'delta' blocks ahead // of miner. func assertMinerBlockHeightDelta(t *harnessTest, miner, tempMiner *rpctest.Harness, delta int32) { // Ensure the chain lengths are what we expect. var predErr error err := lntest.WaitPredicate(func() bool { _, tempMinerHeight, err := tempMiner.Node.GetBestBlock() if err != nil { predErr = fmt.Errorf("unable to get current "+ "blockheight %v", err) return false } _, minerHeight, err := miner.Node.GetBestBlock() if err != nil { predErr = fmt.Errorf("unable to get current "+ "blockheight %v", err) return false } if tempMinerHeight != minerHeight+delta { predErr = fmt.Errorf("expected new miner(%d) to be %d "+ "blocks ahead of original miner(%d)", tempMinerHeight, delta, minerHeight) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } } // testOpenChannelAfterReorg tests that in the case where we have an open // channel where the funding tx gets reorged out, the channel will no // longer be present in the node's routing table. func testOpenChannelAfterReorg(net *lntest.NetworkHarness, t *harnessTest) { var ( ctxb = context.Background() temp = "temp" perm = "perm" ) // Set up a new miner that we can use to cause a reorg. args := []string{"--rejectnonstd", "--txindex"} tempMiner, err := rpctest.New(harnessNetParams, &rpcclient.NotificationHandlers{}, args) if err != nil { t.Fatalf("unable to create mining node: %v", err) } if err := tempMiner.SetUp(false, 0); err != nil { t.Fatalf("unable to set up mining node: %v", err) } defer tempMiner.TearDown() // We start by connecting the new miner to our original miner, // such that it will sync to our original chain. err = net.Miner.Node.Node( btcjson.NConnect, tempMiner.P2PAddress(), &temp, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } nodeSlice := []*rpctest.Harness{net.Miner, tempMiner} if err := rpctest.JoinNodes(nodeSlice, rpctest.Blocks); err != nil { t.Fatalf("unable to join node on blocks: %v", err) } // The two miners should be on the same blockheight. assertMinerBlockHeightDelta(t, net.Miner, tempMiner, 0) // We disconnect the two miners, such that we can mine two different // chains and can cause a reorg later. err = net.Miner.Node.Node( btcjson.NDisconnect, tempMiner.P2PAddress(), &temp, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } // Create a new channel that requires 1 confs before it's considered // open, then broadcast the funding transaction chanAmt := maxBtcFundingAmount pushAmt := btcutil.Amount(0) ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) pendingUpdate, err := net.OpenPendingChannel(ctxt, net.Alice, net.Bob, chanAmt, pushAmt) if err != nil { t.Fatalf("unable to open channel: %v", err) } // Wait for miner to have seen the funding tx. The temporary miner is // disconnected, and won't see the transaction. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to find funding tx in mempool: %v", err) } // At this point, the channel's funding transaction will have been // broadcast, but not confirmed, and the channel should be pending. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 1) fundingTxID, err := chainhash.NewHash(pendingUpdate.Txid) if err != nil { t.Fatalf("unable to convert funding txid into chainhash.Hash:"+ " %v", err) } // We now cause a fork, by letting our original miner mine 10 blocks, // and our new miner mine 15. This will also confirm our pending // channel on the original miner's chain, which should be considered // open. block := mineBlocks(t, net, 10, 1)[0] assertTxInBlock(t, block, fundingTxID) if _, err := tempMiner.Node.Generate(15); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Ensure the chain lengths are what we expect, with the temp miner // being 5 blocks ahead. assertMinerBlockHeightDelta(t, net.Miner, tempMiner, 5) // Wait for Alice to sync to the original miner's chain. _, minerHeight, err := net.Miner.Node.GetBestBlock() if err != nil { t.Fatalf("unable to get current blockheight %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = waitForNodeBlockHeight(ctxt, net.Alice, minerHeight) if err != nil { t.Fatalf("unable to sync to chain: %v", err) } chanPoint := &lnrpc.ChannelPoint{ FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{ FundingTxidBytes: pendingUpdate.Txid, }, OutputIndex: pendingUpdate.OutputIndex, } // Ensure channel is no longer pending. assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 0) // Wait for Alice and Bob to recognize and advertise the new channel // generated above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't advertise channel before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't advertise channel before "+ "timeout: %v", err) } // Alice should now have 1 edge in her graph. req := &lnrpc.ChannelGraphRequest{ IncludeUnannounced: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err := net.Alice.DescribeGraph(ctxt, req) if err != nil { t.Fatalf("unable to query for alice's routing table: %v", err) } numEdges := len(chanGraph.Edges) if numEdges != 1 { t.Fatalf("expected to find one edge in the graph, found %d", numEdges) } // Now we disconnect Alice's chain backend from the original miner, and // connect the two miners together. Since the temporary miner knows // about a longer chain, both miners should sync to that chain. err = net.Miner.Node.Node( btcjson.NRemove, net.BackendCfg.P2PAddr(), &perm, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } // Connecting to the temporary miner should now cause our original // chain to be re-orged out. err = net.Miner.Node.Node( btcjson.NConnect, tempMiner.P2PAddress(), &temp, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } nodes := []*rpctest.Harness{tempMiner, net.Miner} if err := rpctest.JoinNodes(nodes, rpctest.Blocks); err != nil { t.Fatalf("unable to join node on blocks: %v", err) } // Once again they should be on the same chain. assertMinerBlockHeightDelta(t, net.Miner, tempMiner, 0) // Now we disconnect the two miners, and connect our original miner to // our chain backend once again. err = net.Miner.Node.Node( btcjson.NDisconnect, tempMiner.P2PAddress(), &temp, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } err = net.Miner.Node.Node( btcjson.NConnect, net.BackendCfg.P2PAddr(), &perm, ) if err != nil { t.Fatalf("unable to remove node: %v", err) } // This should have caused a reorg, and Alice should sync to the longer // chain, where the funding transaction is not confirmed. _, tempMinerHeight, err := tempMiner.Node.GetBestBlock() if err != nil { t.Fatalf("unable to get current blockheight %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = waitForNodeBlockHeight(ctxt, net.Alice, tempMinerHeight) if err != nil { t.Fatalf("unable to sync to chain: %v", err) } // Since the fundingtx was reorged out, Alice should now have no edges // in her graph. req = &lnrpc.ChannelGraphRequest{ IncludeUnannounced: true, } var predErr error err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err = net.Alice.DescribeGraph(ctxt, req) if err != nil { predErr = fmt.Errorf("unable to query for alice's routing table: %v", err) return false } numEdges = len(chanGraph.Edges) if numEdges != 0 { predErr = fmt.Errorf("expected to find no edge in the graph, found %d", numEdges) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // Cleanup by mining the funding tx again, then closing the channel. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, fundingTxID) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // testDisconnectingTargetPeer performs a test which // disconnects Alice-peer from Bob-peer and then re-connects them again func testDisconnectingTargetPeer(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // Check existing connection. assertNumConnections(t, net.Alice, net.Bob, 1) chanAmt := maxBtcFundingAmount pushAmt := btcutil.Amount(0) // Create a new channel that requires 1 confs before it's considered // open, then broadcast the funding transaction const numConfs = 1 ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) pendingUpdate, err := net.OpenPendingChannel(ctxt, net.Alice, net.Bob, chanAmt, pushAmt) if err != nil { t.Fatalf("unable to open channel: %v", err) } // At this point, the channel's funding transaction will have // been broadcast, but not confirmed. Alice and Bob's nodes // should reflect this when queried via RPC. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 1) // Disconnect Alice-peer from Bob-peer and get error // causes by one pending channel with detach node is existing. if err := net.DisconnectNodes(ctxt, net.Alice, net.Bob); err == nil { t.Fatalf("Bob's peer was disconnected from Alice's"+ " while one pending channel is existing: err %v", err) } time.Sleep(time.Millisecond * 300) // Check existing connection. assertNumConnections(t, net.Alice, net.Bob, 1) fundingTxID, err := chainhash.NewHash(pendingUpdate.Txid) if err != nil { t.Fatalf("unable to convert funding txid into chainhash.Hash:"+ " %v", err) } // Mine a block, then wait for Alice's node to notify us that the // channel has been opened. The funding transaction should be found // within the newly mined block. block := mineBlocks(t, net, numConfs, 1)[0] assertTxInBlock(t, block, fundingTxID) // At this point, the channel should be fully opened and there should // be no pending channels remaining for either node. time.Sleep(time.Millisecond * 300) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, net.Bob, 0) // The channel should be listed in the peer information returned by // both peers. outPoint := wire.OutPoint{ Hash: *fundingTxID, Index: pendingUpdate.OutputIndex, } // Check both nodes to ensure that the channel is ready for operation. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.AssertChannelExists(ctxt, net.Alice, &outPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.AssertChannelExists(ctxt, net.Bob, &outPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. chanPoint := &lnrpc.ChannelPoint{ FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{ FundingTxidBytes: pendingUpdate.Txid, }, OutputIndex: pendingUpdate.OutputIndex, } // Disconnect Alice-peer from Bob-peer and get error // causes by one active channel with detach node is existing. if err := net.DisconnectNodes(ctxt, net.Alice, net.Bob); err == nil { t.Fatalf("Bob's peer was disconnected from Alice's"+ " while one active channel is existing: err %v", err) } // Check existing connection. assertNumConnections(t, net.Alice, net.Bob, 1) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, true) // Disconnect Alice-peer from Bob-peer without getting error // about existing channels. var predErr error err = lntest.WaitPredicate(func() bool { if err := net.DisconnectNodes(ctxt, net.Alice, net.Bob); err != nil { predErr = err return false } return true }, time.Second*15) if err != nil { t.Fatalf("unable to disconnect Bob's peer from Alice's: err %v", predErr) } // Check zero peer connections. assertNumConnections(t, net.Alice, net.Bob, 0) // Finally, re-connect both nodes. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, net.Bob); err != nil { t.Fatalf("unable to connect Alice's peer to Bob's: err %v", err) } // Check existing connection. assertNumConnections(t, net.Alice, net.Bob, 1) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Alice, chanPoint) } // testFundingPersistence is intended to ensure that the Funding Manager // persists the state of new channels prior to broadcasting the channel's // funding transaction. This ensures that the daemon maintains an up-to-date // representation of channels if the system is restarted or disconnected. // testFundingPersistence mirrors testBasicChannelFunding, but adds restarts // and checks for the state of channels with unconfirmed funding transactions. func testChannelFundingPersistence(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() chanAmt := maxBtcFundingAmount pushAmt := btcutil.Amount(0) // As we need to create a channel that requires more than 1 // confirmation before it's open, with the current set of defaults, // we'll need to create a new node instance. const numConfs = 5 carolArgs := []string{fmt.Sprintf("--bitcoin.defaultchanconfs=%v", numConfs)} carol, err := net.NewNode("Carol", carolArgs) if err != nil { t.Fatalf("unable to create new node: %v", err) } // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } // Create a new channel that requires 5 confs before it's considered // open, then broadcast the funding transaction ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) pendingUpdate, err := net.OpenPendingChannel(ctxt, net.Alice, carol, chanAmt, pushAmt) if err != nil { t.Fatalf("unable to open channel: %v", err) } // At this point, the channel's funding transaction will have been // broadcast, but not confirmed. Alice and Bob's nodes should reflect // this when queried via RPC. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, carol, 1) // Restart both nodes to test that the appropriate state has been // persisted and that both nodes recover gracefully. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } fundingTxID, err := chainhash.NewHash(pendingUpdate.Txid) if err != nil { t.Fatalf("unable to convert funding txid into chainhash.Hash:"+ " %v", err) } // Mine a block, then wait for Alice's node to notify us that the // channel has been opened. The funding transaction should be found // within the newly mined block. block := mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, fundingTxID) // Restart both nodes to test that the appropriate state has been // persisted and that both nodes recover gracefully. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // The following block ensures that after both nodes have restarted, // they have reconnected before the execution of the next test. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.EnsureConnected(ctxt, net.Alice, carol); err != nil { t.Fatalf("peers unable to reconnect after restart: %v", err) } // Next, mine enough blocks s.t the channel will open with a single // additional block mined. if _, err := net.Miner.Node.Generate(3); err != nil { t.Fatalf("unable to mine blocks: %v", err) } // Both nodes should still show a single channel as pending. time.Sleep(time.Second * 1) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, carol, 1) // Finally, mine the last block which should mark the channel as open. if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to mine blocks: %v", err) } // At this point, the channel should be fully opened and there should // be no pending channels remaining for either node. time.Sleep(time.Second * 1) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) assertNumOpenChannelsPending(ctxt, t, net.Alice, carol, 0) // The channel should be listed in the peer information returned by // both peers. outPoint := wire.OutPoint{ Hash: *fundingTxID, Index: pendingUpdate.OutputIndex, } // Check both nodes to ensure that the channel is ready for operation. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.AssertChannelExists(ctxt, net.Alice, &outPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.AssertChannelExists(ctxt, carol, &outPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. chanPoint := &lnrpc.ChannelPoint{ FundingTxid: &lnrpc.ChannelPoint_FundingTxidBytes{ FundingTxidBytes: pendingUpdate.Txid, }, OutputIndex: pendingUpdate.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // testChannelBalance creates a new channel between Alice and Bob, then // checks channel balance to be equal amount specified while creation of channel. func testChannelBalance(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // Open a channel with 0.16 BTC between Alice and Bob, ensuring the // channel has been opened properly. amount := maxBtcFundingAmount // Creates a helper closure to be used below which asserts the proper // response to a channel balance RPC. checkChannelBalance := func(node lnrpc.LightningClient, amount btcutil.Amount) { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) response, err := node.ChannelBalance(ctxt, &lnrpc.ChannelBalanceRequest{}) if err != nil { t.Fatalf("unable to get channel balance: %v", err) } balance := btcutil.Amount(response.Balance) if balance != amount { t.Fatalf("channel balance wrong: %v != %v", balance, amount) } } // Before beginning, make sure alice and bob are connected. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.EnsureConnected(ctxt, net.Alice, net.Bob); err != nil { t.Fatalf("unable to connect alice and bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: amount, }, ) // Wait for both Alice and Bob to recognize this new channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't advertise channel before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't advertise channel before "+ "timeout: %v", err) } // As this is a single funder channel, Alice's balance should be // exactly 0.5 BTC since now state transitions have taken place yet. checkChannelBalance(net.Alice, amount-calcStaticFee(0)) // Ensure Bob currently has no available balance within the channel. checkChannelBalance(net.Bob, 0) // Finally close the channel between Alice and Bob, asserting that the // channel has been properly closed on-chain. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // testChannelUnsettledBalance will test that the UnsettledBalance field // is updated according to the number of Pending Htlcs. // Alice will send Htlcs to Carol while she is in hodl mode. This will result // in a build of pending Htlcs. We expect the channels unsettled balance to // equal the sum of all the Pending Htlcs. func testChannelUnsettledBalance(net *lntest.NetworkHarness, t *harnessTest) { const chanAmt = btcutil.Amount(1000000) ctxb := context.Background() // Create carol in hodl mode. carol, err := net.NewNode("Carol", []string{ "--debughtlc", "--hodl.exit-settle", }) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) // Connect Alice to Carol. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxb, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } // Open a channel between Alice and Carol. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Wait for Alice and Carol to receive the channel edge from the // funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("alice didn't see the alice->carol channel before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("alice didn't see the alice->carol channel before "+ "timeout: %v", err) } // Channel should be ready for payments. const ( payAmt = 100 numInvoices = 6 ) // Create a paystream from Alice to Carol to enable Alice to make // a series of payments. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayStream, err := net.Alice.SendPayment(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } // Send payments from Alice to Carol a number of numInvoices // times. carolPubKey := carol.PubKey[:] for i := 0; i < numInvoices; i++ { err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(payAmt), PaymentHash: makeFakePayHash(t), FinalCltvDelta: defaultBitcoinTimeLockDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } } // Test that the UnsettledBalance for both Alice and Carol // is equal to the amount of invoices * payAmt. var unsettledErr error nodes := []*lntest.HarnessNode{net.Alice, carol} err = lntest.WaitPredicate(func() bool { // There should be a number of PendingHtlcs equal // to the amount of Invoices sent. unsettledErr = assertNumActiveHtlcs(nodes, numInvoices) if unsettledErr != nil { return false } // Set the amount expected for the Unsettled Balance for // this channel. expectedBalance := numInvoices * payAmt // Check each nodes UnsettledBalance field. for _, node := range nodes { // Get channel info for the node. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanInfo, err := getChanInfo(ctxt, node) if err != nil { unsettledErr = err return false } // Check that UnsettledBalance is what we expect. if int(chanInfo.UnsettledBalance) != expectedBalance { unsettledErr = fmt.Errorf("unsettled balance failed "+ "expected: %v, received: %v", expectedBalance, chanInfo.UnsettledBalance) return false } } return true }, defaultTimeout) if err != nil { t.Fatalf("unsettled balace error: %v", unsettledErr) } // Force and assert the channel closure. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Alice, chanPointAlice) } // findForceClosedChannel searches a pending channel response for a particular // channel, returning the force closed channel upon success. func findForceClosedChannel(pendingChanResp *lnrpc.PendingChannelsResponse, op *wire.OutPoint) (*lnrpc.PendingChannelsResponse_ForceClosedChannel, error) { for _, forceClose := range pendingChanResp.PendingForceClosingChannels { if forceClose.Channel.ChannelPoint == op.String() { return forceClose, nil } } return nil, errors.New("channel not marked as force closed") } // findWaitingCloseChannel searches a pending channel response for a particular // channel, returning the waiting close channel upon success. func findWaitingCloseChannel(pendingChanResp *lnrpc.PendingChannelsResponse, op *wire.OutPoint) (*lnrpc.PendingChannelsResponse_WaitingCloseChannel, error) { for _, waitingClose := range pendingChanResp.WaitingCloseChannels { if waitingClose.Channel.ChannelPoint == op.String() { return waitingClose, nil } } return nil, errors.New("channel not marked as waiting close") } func checkCommitmentMaturity( forceClose *lnrpc.PendingChannelsResponse_ForceClosedChannel, maturityHeight uint32, blocksTilMaturity int32) error { if forceClose.MaturityHeight != maturityHeight { return fmt.Errorf("expected commitment maturity height to be "+ "%d, found %d instead", maturityHeight, forceClose.MaturityHeight) } if forceClose.BlocksTilMaturity != blocksTilMaturity { return fmt.Errorf("expected commitment blocks til maturity to "+ "be %d, found %d instead", blocksTilMaturity, forceClose.BlocksTilMaturity) } return nil } // checkForceClosedChannelNumHtlcs verifies that a force closed channel has the // proper number of htlcs. func checkPendingChannelNumHtlcs( forceClose *lnrpc.PendingChannelsResponse_ForceClosedChannel, expectedNumHtlcs int) error { if len(forceClose.PendingHtlcs) != expectedNumHtlcs { return fmt.Errorf("expected force closed channel to have %d "+ "pending htlcs, found %d instead", expectedNumHtlcs, len(forceClose.PendingHtlcs)) } return nil } // checkNumForceClosedChannels checks that a pending channel response has the // expected number of force closed channels. func checkNumForceClosedChannels(pendingChanResp *lnrpc.PendingChannelsResponse, expectedNumChans int) error { if len(pendingChanResp.PendingForceClosingChannels) != expectedNumChans { return fmt.Errorf("expected to find %d force closed channels, "+ "got %d", expectedNumChans, len(pendingChanResp.PendingForceClosingChannels)) } return nil } // checkNumWaitingCloseChannels checks that a pending channel response has the // expected number of channels waiting for closing tx to confirm. func checkNumWaitingCloseChannels(pendingChanResp *lnrpc.PendingChannelsResponse, expectedNumChans int) error { if len(pendingChanResp.WaitingCloseChannels) != expectedNumChans { return fmt.Errorf("expected to find %d channels waiting "+ "closure, got %d", expectedNumChans, len(pendingChanResp.WaitingCloseChannels)) } return nil } // checkPendingHtlcStageAndMaturity uniformly tests all pending htlc's belonging // to a force closed channel, testing for the expected stage number, blocks till // maturity, and the maturity height. func checkPendingHtlcStageAndMaturity( forceClose *lnrpc.PendingChannelsResponse_ForceClosedChannel, stage, maturityHeight uint32, blocksTillMaturity int32) error { for _, pendingHtlc := range forceClose.PendingHtlcs { if pendingHtlc.Stage != stage { return fmt.Errorf("expected pending htlc to be stage "+ "%d, found %d", stage, pendingHtlc.Stage) } if pendingHtlc.MaturityHeight != maturityHeight { return fmt.Errorf("expected pending htlc maturity "+ "height to be %d, instead has %d", maturityHeight, pendingHtlc.MaturityHeight) } if pendingHtlc.BlocksTilMaturity != blocksTillMaturity { return fmt.Errorf("expected pending htlc blocks til "+ "maturity to be %d, instead has %d", blocksTillMaturity, pendingHtlc.BlocksTilMaturity) } } return nil } // testChannelForceClosure performs a test to exercise the behavior of "force" // closing a channel or unilaterally broadcasting the latest local commitment // state on-chain. The test creates a new channel between Alice and Carol, then // force closes the channel after some cursory assertions. Within the test, a // total of 3 + n transactions will be broadcast, representing the commitment // transaction, a transaction sweeping the local CSV delayed output, a // transaction sweeping the CSV delayed 2nd-layer htlcs outputs, and n // htlc success transactions, where n is the number of payments Alice attempted // to send to Carol. This test includes several restarts to ensure that the // transaction output states are persisted throughout the forced closure // process. // // TODO(roasbeef): also add an unsettled HTLC before force closing. func testChannelForceClosure(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = btcutil.Amount(10e6) pushAmt = btcutil.Amount(5e6) paymentAmt = 100000 numInvoices = 6 ) // TODO(roasbeef): should check default value in config here // instead, or make delay a param defaultCLTV := uint32(defaultBitcoinTimeLockDelta) // Since we'd like to test failure scenarios with outstanding htlcs, // we'll introduce another node into our test network: Carol. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) // We must let Alice have an open channel before she can send a node // announcement, so we open a channel with Carol, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } // Before we start, obtain Carol's current wallet balance, we'll check // to ensure that at the end of the force closure by Alice, Carol // recognizes his new on-chain output. carolBalReq := &lnrpc.WalletBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err := carol.WalletBalance(ctxt, carolBalReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolStartingBalance := carolBalResp.ConfirmedBalance ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) // Wait for Alice and Carol to receive the channel edge from the // funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't see the alice->carol channel before "+ "timeout: %v", err) } err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't see the alice->carol channel before "+ "timeout: %v", err) } // Send payments from Alice to Carol, since Carol is htlchodl mode, the // htlc outputs should be left unsettled, and should be swept by the // utxo nursery. ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } carolPubKey := carol.PubKey[:] for i := 0; i < numInvoices; i++ { err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(paymentAmt), PaymentHash: makeFakePayHash(t), FinalCltvDelta: defaultBitcoinTimeLockDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } } // Once the HTLC has cleared, all the nodes n our mini network should // show that the HTLC has been locked in. nodes := []*lntest.HarnessNode{net.Alice, carol} var predErr error err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numInvoices) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Fetch starting height of this test so we can compute the block // heights we expect certain events to take place. _, curHeight, err := net.Miner.Node.GetBestBlock() if err != nil { t.Fatalf("unable to get best block height") } // Using the current height of the chain, derive the relevant heights // for incubating two-stage htlcs. var ( startHeight = uint32(curHeight) commCsvMaturityHeight = startHeight + 1 + defaultCSV htlcExpiryHeight = startHeight + defaultCLTV htlcCsvMaturityHeight = startHeight + defaultCLTV + 1 + defaultCSV ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceChan, err := getChanInfo(ctxt, net.Alice) if err != nil { t.Fatalf("unable to get alice's channel info: %v", err) } if aliceChan.NumUpdates == 0 { t.Fatalf("alice should see at least one update to her channel") } // Now that the channel is open and we have unsettled htlcs, immediately // execute a force closure of the channel. This will also assert that // the commitment transaction was immediately broadcast in order to // fulfill the force closure request. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) _, closingTxID, err := net.CloseChannel(ctxt, net.Alice, chanPoint, true) if err != nil { t.Fatalf("unable to execute force channel closure: %v", err) } // Now that the channel has been force closed, it should show up in the // PendingChannels RPC under the waiting close section. pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels(ctxt, pendingChansRequest) if err != nil { t.Fatalf("unable to query for pending channels: %v", err) } err = checkNumWaitingCloseChannels(pendingChanResp, 1) if err != nil { t.Fatalf(err.Error()) } // Compute the outpoint of the channel, which we will use repeatedly to // locate the pending channel information in the rpc responses. txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } op := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } waitingClose, err := findWaitingCloseChannel(pendingChanResp, &op) if err != nil { t.Fatalf(err.Error()) } // Immediately after force closing, all of the funds should be in limbo. if waitingClose.LimboBalance == 0 { t.Fatalf("all funds should still be in limbo") } // The several restarts in this test are intended to ensure that when a // channel is force-closed, the UTXO nursery has persisted the state of // the channel in the closure process and will recover the correct state // when the system comes back on line. This restart tests state // persistence at the beginning of the process, when the commitment // transaction has been broadcast but not yet confirmed in a block. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Mine a block which should confirm the commitment transaction // broadcast as a result of the force closure. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to find commitment in miner mempool: %v", err) } if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to generate block: %v", err) } // Now that the commitment has been confirmed, the channel should be // marked as force closed. err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } predErr = checkNumForceClosedChannels(pendingChanResp, 1) if predErr != nil { return false } forceClose, predErr := findForceClosedChannel( pendingChanResp, &op, ) if predErr != nil { return false } // Now that the channel has been force closed, it should now // have the height and number of blocks to confirm populated. predErr = checkCommitmentMaturity( forceClose, commCsvMaturityHeight, int32(defaultCSV), ) if predErr != nil { return false } // None of our outputs have been swept, so they should all be in // limbo. if forceClose.LimboBalance == 0 { predErr = errors.New("all funds should still be in " + "limbo") return false } if forceClose.RecoveredBalance != 0 { predErr = errors.New("no funds should yet be shown " + "as recovered") return false } return true }, 15*time.Second) if err != nil { t.Fatalf(predErr.Error()) } // The following restart is intended to ensure that outputs from the // force close commitment transaction have been persisted once the // transaction has been confirmed, but before the outputs are spendable // (the "kindergarten" bucket.) if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Carol's sweep tx should be in the mempool already, as her output is // not timelocked. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to find Carol's sweep in miner mempool: %v", err) } // Currently within the codebase, the default CSV is 4 relative blocks. // For the persistence test, we generate three blocks, then trigger // a restart and then generate the final block that should trigger // the creation of the sweep transaction. if _, err := net.Miner.Node.Generate(defaultCSV - 1); err != nil { t.Fatalf("unable to mine blocks: %v", err) } // The following restart checks to ensure that outputs in the // kindergarten bucket are persisted while waiting for the required // number of confirmations to be reported. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Alice should see the channel in her set of pending force closed // channels with her funds still in limbo. err = lntest.WaitNoError(func() error { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { return fmt.Errorf("unable to query for pending "+ "channels: %v", err) } err = checkNumForceClosedChannels(pendingChanResp, 1) if err != nil { return err } forceClose, err := findForceClosedChannel( pendingChanResp, &op, ) if err != nil { return err } // At this point, the nursery should show that the commitment // output has 1 block left before its CSV delay expires. In // total, we have mined exactly defaultCSV blocks, so the htlc // outputs should also reflect that this many blocks have // passed. err = checkCommitmentMaturity( forceClose, commCsvMaturityHeight, 1, ) if err != nil { return err } // All funds should still be shown in limbo. if forceClose.LimboBalance == 0 { return errors.New("all funds should still be in " + "limbo") } if forceClose.RecoveredBalance != 0 { return errors.New("no funds should yet be shown " + "as recovered") } return nil }, 15*time.Second) if err != nil { t.Fatalf(err.Error()) } // Generate an additional block, which should cause the CSV delayed // output from the commitment txn to expire. if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to mine blocks: %v", err) } // At this point, the sweeping transaction should now be broadcast. So // we fetch the node's mempool to ensure it has been properly // broadcast. sweepingTXID, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to get sweep tx from mempool: %v", err) } // Fetch the sweep transaction, all input it's spending should be from // the commitment transaction which was broadcast on-chain. sweepTx, err := net.Miner.Node.GetRawTransaction(sweepingTXID) if err != nil { t.Fatalf("unable to fetch sweep tx: %v", err) } for _, txIn := range sweepTx.MsgTx().TxIn { if !closingTxID.IsEqual(&txIn.PreviousOutPoint.Hash) { t.Fatalf("sweep transaction not spending from commit "+ "tx %v, instead spending %v", closingTxID, txIn.PreviousOutPoint) } } // Restart Alice to ensure that she resumes watching the finalized // commitment sweep txid. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Next, we mine an additional block which should include the sweep // transaction as the input scripts and the sequence locks on the // inputs should be properly met. blockHash, err := net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate block: %v", err) } block, err := net.Miner.Node.GetBlock(blockHash[0]) if err != nil { t.Fatalf("unable to get block: %v", err) } assertTxInBlock(t, block, sweepTx.Hash()) // Update current height _, curHeight, err = net.Miner.Node.GetBestBlock() if err != nil { t.Fatalf("unable to get best block height") } err = lntest.WaitPredicate(func() bool { // Now that the commit output has been fully swept, check to see // that the channel remains open for the pending htlc outputs. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } err = checkNumForceClosedChannels(pendingChanResp, 1) if err != nil { predErr = err return false } // The commitment funds will have been recovered after the // commit txn was included in the last block. The htlc funds // will be shown in limbo. forceClose, err := findForceClosedChannel(pendingChanResp, &op) if err != nil { predErr = err return false } predErr = checkPendingChannelNumHtlcs(forceClose, numInvoices) if predErr != nil { return false } predErr = checkPendingHtlcStageAndMaturity( forceClose, 1, htlcExpiryHeight, int32(htlcExpiryHeight)-curHeight, ) if predErr != nil { return false } if forceClose.LimboBalance == 0 { predErr = fmt.Errorf("expected funds in limbo, found 0") return false } return true }, 15*time.Second) if err != nil { t.Fatalf(predErr.Error()) } // Compute the height preceding that which will cause the htlc CLTV // timeouts will expire. The outputs entered at the same height as the // output spending from the commitment txn, so we must deduct the number // of blocks we have generated since adding it to the nursery, and take // an additional block off so that we end up one block shy of the expiry // height. cltvHeightDelta := defaultCLTV - defaultCSV - 2 - 1 // Advance the blockchain until just before the CLTV expires, nothing // exciting should have happened during this time. blockHash, err = net.Miner.Node.Generate(cltvHeightDelta) if err != nil { t.Fatalf("unable to generate block: %v", err) } // We now restart Alice, to ensure that she will broadcast the presigned // htlc timeout txns after the delay expires after experiencing a while // waiting for the htlc outputs to incubate. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Alice should now see the channel in her set of pending force closed // channels with one pending HTLC. err = lntest.WaitNoError(func() error { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { return fmt.Errorf("unable to query for pending "+ "channels: %v", err) } err = checkNumForceClosedChannels(pendingChanResp, 1) if err != nil { return err } forceClose, err := findForceClosedChannel( pendingChanResp, &op, ) if err != nil { return err } // We should now be at the block just before the utxo nursery // will attempt to broadcast the htlc timeout transactions. err = checkPendingChannelNumHtlcs(forceClose, numInvoices) if err != nil { return err } err = checkPendingHtlcStageAndMaturity( forceClose, 1, htlcExpiryHeight, 1, ) if err != nil { return err } // Now that our commitment confirmation depth has been // surpassed, we should now see a non-zero recovered balance. // All htlc outputs are still left in limbo, so it should be // non-zero as well. if forceClose.LimboBalance == 0 { return errors.New("htlc funds should still be in " + "limbo") } return nil }, 15*time.Second) if err != nil { t.Fatalf(err.Error()) } // Now, generate the block which will cause Alice to broadcast the // presigned htlc timeout txns. blockHash, err = net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate block: %v", err) } // Since Alice had numInvoices (6) htlcs extended to Carol before force // closing, we expect Alice to broadcast an htlc timeout txn for each // one. Wait for them all to show up in the mempool. htlcTxIDs, err := waitForNTxsInMempool(net.Miner.Node, numInvoices, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find htlc timeout txns in mempool: %v", err) } // Retrieve each htlc timeout txn from the mempool, and ensure it is // well-formed. This entails verifying that each only spends from // output, and that that output is from the commitment txn. for _, htlcTxID := range htlcTxIDs { // Fetch the sweep transaction, all input it's spending should // be from the commitment transaction which was broadcast // on-chain. htlcTx, err := net.Miner.Node.GetRawTransaction(htlcTxID) if err != nil { t.Fatalf("unable to fetch sweep tx: %v", err) } // Ensure the htlc transaction only has one input. if len(htlcTx.MsgTx().TxIn) != 1 { t.Fatalf("htlc transaction should only have one txin, "+ "has %d", len(htlcTx.MsgTx().TxIn)) } // Ensure the htlc transaction is spending from the commitment // transaction. txIn := htlcTx.MsgTx().TxIn[0] if !closingTxID.IsEqual(&txIn.PreviousOutPoint.Hash) { t.Fatalf("htlc transaction not spending from commit "+ "tx %v, instead spending %v", closingTxID, txIn.PreviousOutPoint) } } // With the htlc timeout txns still in the mempool, we restart Alice to // verify that she can resume watching the htlc txns she broadcasted // before crashing. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Generate a block that mines the htlc timeout txns. Doing so now // activates the 2nd-stage CSV delayed outputs. blockHash, err = net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate block: %v", err) } // Alice is restarted here to ensure that she promptly moved the crib // outputs to the kindergarten bucket after the htlc timeout txns were // confirmed. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Advance the chain until just before the 2nd-layer CSV delays expire. blockHash, err = net.Miner.Node.Generate(defaultCSV - 1) if err != nil { t.Fatalf("unable to generate block: %v", err) } // Restart Alice to ensure that she can recover from a failure before // having graduated the htlc outputs in the kindergarten bucket. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Now that the channel has been fully swept, it should no longer show // incubated, check to see that Alice's node still reports the channel // as pending force closed. err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err = net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } err = checkNumForceClosedChannels(pendingChanResp, 1) if err != nil { predErr = err return false } forceClose, err := findForceClosedChannel(pendingChanResp, &op) if err != nil { predErr = err return false } if forceClose.LimboBalance == 0 { predErr = fmt.Errorf("htlc funds should still be in limbo") return false } predErr = checkPendingChannelNumHtlcs(forceClose, numInvoices) if predErr != nil { return false } return true }, 15*time.Second) if err != nil { t.Fatalf(predErr.Error()) } // Generate a block that causes Alice to sweep the htlc outputs in the // kindergarten bucket. blockHash, err = net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate block: %v", err) } // Wait for the single sweep txn to appear in the mempool. htlcSweepTxID, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("failed to get sweep tx from mempool: %v", err) } // Construct a map of the already confirmed htlc timeout txids, that // will count the number of times each is spent by the sweep txn. We // prepopulate it in this way so that we can later detect if we are // spending from an output that was not a confirmed htlc timeout txn. var htlcTxIDSet = make(map[chainhash.Hash]int) for _, htlcTxID := range htlcTxIDs { htlcTxIDSet[*htlcTxID] = 0 } // Fetch the htlc sweep transaction from the mempool. htlcSweepTx, err := net.Miner.Node.GetRawTransaction(htlcSweepTxID) if err != nil { t.Fatalf("unable to fetch sweep tx: %v", err) } // Ensure the htlc sweep transaction only has one input for each htlc // Alice extended before force closing. if len(htlcSweepTx.MsgTx().TxIn) != numInvoices { t.Fatalf("htlc transaction should have %d txin, "+ "has %d", numInvoices, len(htlcSweepTx.MsgTx().TxIn)) } // Ensure that each output spends from exactly one htlc timeout txn. for _, txIn := range htlcSweepTx.MsgTx().TxIn { outpoint := txIn.PreviousOutPoint.Hash // Check that the input is a confirmed htlc timeout txn. if _, ok := htlcTxIDSet[outpoint]; !ok { t.Fatalf("htlc sweep output not spending from htlc "+ "tx, instead spending output %v", outpoint) } // Increment our count for how many times this output was spent. htlcTxIDSet[outpoint]++ // Check that each is only spent once. if htlcTxIDSet[outpoint] > 1 { t.Fatalf("htlc sweep tx has multiple spends from "+ "outpoint %v", outpoint) } } // The following restart checks to ensure that the nursery store is // storing the txid of the previously broadcast htlc sweep txn, and that // it begins watching that txid after restarting. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Now that the channel has been fully swept, it should no longer show // incubated, check to see that Alice's node still reports the channel // as pending force closed. err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } err = checkNumForceClosedChannels(pendingChanResp, 1) if err != nil { predErr = err return false } // All htlcs should show zero blocks until maturity, as // evidenced by having checked the sweep transaction in the // mempool. forceClose, err := findForceClosedChannel(pendingChanResp, &op) if err != nil { predErr = err return false } predErr = checkPendingChannelNumHtlcs(forceClose, numInvoices) if predErr != nil { return false } err = checkPendingHtlcStageAndMaturity( forceClose, 2, htlcCsvMaturityHeight, 0, ) if err != nil { predErr = err return false } return true }, 15*time.Second) if err != nil { t.Fatalf(predErr.Error()) } // Generate the final block that sweeps all htlc funds into the user's // wallet. blockHash, err = net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate block: %v", err) } // Now that the channel has been fully swept, it should no longer show // up within the pending channels RPC. err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } predErr = checkNumForceClosedChannels(pendingChanResp, 0) if predErr != nil { return false } // In addition to there being no pending channels, we verify // that pending channels does not report any money still in // limbo. if pendingChanResp.TotalLimboBalance != 0 { predErr = errors.New("no user funds should be left " + "in limbo after incubation") return false } return true }, 15*time.Second) if err != nil { t.Fatalf(predErr.Error()) } // At this point, Bob should now be aware of his new immediately // spendable on-chain balance, as it was Alice who broadcast the // commitment transaction. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err = net.Bob.WalletBalance(ctxt, carolBalReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolExpectedBalance := btcutil.Amount(carolStartingBalance) + pushAmt if btcutil.Amount(carolBalResp.ConfirmedBalance) < carolExpectedBalance { t.Fatalf("carol's balance is incorrect: expected %v got %v", carolExpectedBalance, carolBalResp.ConfirmedBalance) } } // testSphinxReplayPersistence verifies that replayed onion packets are rejected // by a remote peer after a restart. We use a combination of unsafe // configuration arguments to force Carol to replay the same sphinx packet after // reconnecting to Dave, and compare the returned failure message with what we // expect for replayed onion packets. func testSphinxReplayPersistence(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // Open a channel with 100k satoshis between Carol and Dave with Carol being // the sole funder of the channel. chanAmt := btcutil.Amount(100000) // First, we'll create Dave, the receiver, and start him in hodl mode. dave, err := net.NewNode("Dave", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } // We must remember to shutdown the nodes we created for the duration // of the tests, only leaving the two seed nodes (Alice and Bob) within // our test network. defer shutdownAndAssert(net, t, dave) // Next, we'll create Carol and establish a channel to from her to // Dave. Carol is started in both unsafe-replay and unsafe-disconnect, // which will cause her to replay any pending Adds held in memory upon // reconnection. carol, err := net.NewNode("Carol", []string{"--unsafe-replay"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) assertAmountSent := func(amt btcutil.Amount) { // Both channels should also have properly accounted from the // amount that has been sent/received over the channel. listReq := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolListChannels, err := carol.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to query for alice's channel list: %v", err) } carolSatoshisSent := carolListChannels.Channels[0].TotalSatoshisSent if carolSatoshisSent != int64(amt) { t.Fatalf("Carol's satoshis sent is incorrect got %v, expected %v", carolSatoshisSent, amt) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) daveListChannels, err := dave.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to query for Dave's channel list: %v", err) } daveSatoshisReceived := daveListChannels.Channels[0].TotalSatoshisReceived if daveSatoshisReceived != int64(amt) { t.Fatalf("Dave's satoshis received is incorrect got %v, expected %v", daveSatoshisReceived, amt) } } // Now that the channel is open, create an invoice for Dave which // expects a payment of 1000 satoshis from Carol paid via a particular // preimage. const paymentAmt = 1000 preimage := bytes.Repeat([]byte("A"), 32) invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: preimage, Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) invoiceResp, err := dave.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } // Wait for Carol to recognize and advertise the new channel generated // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't advertise channel before "+ "timeout: %v", err) } err = dave.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't advertise channel before "+ "timeout: %v", err) } // With the invoice for Dave added, send a payment from Carol paying // to the above generated invoice. ctx, cancel := context.WithCancel(ctxb) defer cancel() payStream, err := carol.SendPayment(ctx) if err != nil { t.Fatalf("unable to open payment stream: %v", err) } sendReq := &lnrpc.SendRequest{PaymentRequest: invoiceResp.PaymentRequest} err = payStream.Send(sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } time.Sleep(200 * time.Millisecond) // Dave's invoice should not be marked as settled. payHash := &lnrpc.PaymentHash{ RHash: invoiceResp.RHash, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) dbInvoice, err := dave.LookupInvoice(ctxt, payHash) if err != nil { t.Fatalf("unable to lookup invoice: %v", err) } if dbInvoice.Settled { t.Fatalf("dave's invoice should not be marked as settled: %v", spew.Sdump(dbInvoice)) } // With the payment sent but hedl, all balance related stats should not // have changed. time.Sleep(time.Millisecond * 200) assertAmountSent(0) // With the first payment sent, restart dave to make sure he is // persisting the information required to detect replayed sphinx // packets. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to restart dave: %v", err) } // Carol should retransmit the Add hedl in her mailbox on startup. Dave // should not accept the replayed Add, and actually fail back the // pending payment. Even though he still holds the original settle, if // he does fail, it is almost certainly caused by the sphinx replay // protection, as it is the only validation we do in hodl mode. resp, err := payStream.Recv() if err != nil { t.Fatalf("unable to receive payment response: %v", err) } // Construct the response we expect after sending a duplicate packet // that fails due to sphinx replay detection. replayErr := fmt.Sprintf("unable to route payment to destination: "+ "TemporaryChannelFailure: unable to de-obfuscate onion failure, "+ "htlc with hash(%x): unable to retrieve onion failure", invoiceResp.RHash) if resp.PaymentError != replayErr { t.Fatalf("received payment error: %v", resp.PaymentError) } // Since the payment failed, the balance should still be left // unaltered. assertAmountSent(0) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPoint, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, carol, chanPoint) } func testSingleHopInvoice(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // Open a channel with 100k satoshis between Alice and Bob with Alice being // the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanAmt := btcutil.Amount(100000) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) assertAmountSent := func(amt btcutil.Amount) { // Both channels should also have properly accounted from the // amount that has been sent/received over the channel. listReq := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceListChannels, err := net.Alice.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to query for alice's channel list: %v", err) } aliceSatoshisSent := aliceListChannels.Channels[0].TotalSatoshisSent if aliceSatoshisSent != int64(amt) { t.Fatalf("Alice's satoshis sent is incorrect got %v, expected %v", aliceSatoshisSent, amt) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobListChannels, err := net.Bob.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to query for bob's channel list: %v", err) } bobSatoshisReceived := bobListChannels.Channels[0].TotalSatoshisReceived if bobSatoshisReceived != int64(amt) { t.Fatalf("Bob's satoshis received is incorrect got %v, expected %v", bobSatoshisReceived, amt) } } // Now that the channel is open, create an invoice for Bob which // expects a payment of 1000 satoshis from Alice paid via a particular // preimage. const paymentAmt = 1000 preimage := bytes.Repeat([]byte("A"), 32) invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: preimage, Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) invoiceResp, err := net.Bob.AddInvoice(ctxb, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } // Wait for Alice to recognize and advertise the new channel generated // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't advertise channel before "+ "timeout: %v", err) } err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't advertise channel before "+ "timeout: %v", err) } // With the invoice for Bob added, send a payment towards Alice paying // to the above generated invoice. sendReq := &lnrpc.SendRequest{ PaymentRequest: invoiceResp.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } // Ensure we obtain the proper preimage in the response. if resp.PaymentError != "" { t.Fatalf("error when attempting recv: %v", resp.PaymentError) } else if !bytes.Equal(preimage, resp.PaymentPreimage) { t.Fatalf("preimage mismatch: expected %v, got %v", preimage, resp.GetPaymentPreimage()) } // Bob's invoice should now be found and marked as settled. payHash := &lnrpc.PaymentHash{ RHash: invoiceResp.RHash, } ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) dbInvoice, err := net.Bob.LookupInvoice(ctxt, payHash) if err != nil { t.Fatalf("unable to lookup invoice: %v", err) } if !dbInvoice.Settled { t.Fatalf("bob's invoice should be marked as settled: %v", spew.Sdump(dbInvoice)) } // With the payment completed all balance related stats should be // properly updated. time.Sleep(time.Millisecond * 200) assertAmountSent(paymentAmt) // Create another invoice for Bob, this time leaving off the preimage // to one will be randomly generated. We'll test the proper // encoding/decoding of the zpay32 payment requests. invoice = &lnrpc.Invoice{ Memo: "test3", Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) invoiceResp, err = net.Bob.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } // Next send another payment, but this time using a zpay32 encoded // invoice rather than manually specifying the payment details. sendReq = &lnrpc.SendRequest{ PaymentRequest: invoiceResp.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err = net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError != "" { t.Fatalf("error when attempting recv: %v", resp.PaymentError) } // The second payment should also have succeeded, with the balances // being update accordingly. time.Sleep(time.Millisecond * 200) assertAmountSent(paymentAmt * 2) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } func testListPayments(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First start by deleting all payments that Alice knows of. This will // allow us to execute the test with a clean state for Alice. delPaymentsReq := &lnrpc.DeleteAllPaymentsRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if _, err := net.Alice.DeleteAllPayments(ctxt, delPaymentsReq); err != nil { t.Fatalf("unable to delete payments: %v", err) } // Check that there are no payments before test. reqInit := &lnrpc.ListPaymentsRequest{} ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) paymentsRespInit, err := net.Alice.ListPayments(ctxt, reqInit) if err != nil { t.Fatalf("error when obtaining Alice payments: %v", err) } if len(paymentsRespInit.Payments) != 0 { t.Fatalf("incorrect number of payments, got %v, want %v", len(paymentsRespInit.Payments), 0) } // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. chanAmt := btcutil.Amount(100000) ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Now that the channel is open, create an invoice for Bob which // expects a payment of 1000 satoshis from Alice paid via a particular // preimage. const paymentAmt = 1000 preimage := bytes.Repeat([]byte("B"), 32) invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: preimage, Value: paymentAmt, } addInvoiceCtxt, _ := context.WithTimeout(ctxb, defaultTimeout) invoiceResp, err := net.Bob.AddInvoice(addInvoiceCtxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } // Wait for Alice to recognize and advertise the new channel generated // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint); err != nil { t.Fatalf("alice didn't advertise channel before "+ "timeout: %v", err) } if err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint); err != nil { t.Fatalf("bob didn't advertise channel before "+ "timeout: %v", err) } // With the invoice for Bob added, send a payment towards Alice paying // to the above generated invoice. sendReq := &lnrpc.SendRequest{ PaymentRequest: invoiceResp.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError != "" { t.Fatalf("error when attempting recv: %v", resp.PaymentError) } // Grab Alice's list of payments, she should show the existence of // exactly one payment. req := &lnrpc.ListPaymentsRequest{} ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) paymentsResp, err := net.Alice.ListPayments(ctxt, req) if err != nil { t.Fatalf("error when obtaining Alice payments: %v", err) } if len(paymentsResp.Payments) != 1 { t.Fatalf("incorrect number of payments, got %v, want %v", len(paymentsResp.Payments), 1) } p := paymentsResp.Payments[0] // Ensure that the stored path shows a direct payment to Bob with no // other nodes in-between. expectedPath := []string{ net.Bob.PubKeyStr, } if !reflect.DeepEqual(p.Path, expectedPath) { t.Fatalf("incorrect path, got %v, want %v", p.Path, expectedPath) } // The payment amount should also match our previous payment directly. if p.Value != paymentAmt { t.Fatalf("incorrect amount, got %v, want %v", p.Value, paymentAmt) } // The payment hash (or r-hash) should have been stored correctly. correctRHash := hex.EncodeToString(invoiceResp.RHash) if !reflect.DeepEqual(p.PaymentHash, correctRHash) { t.Fatalf("incorrect RHash, got %v, want %v", p.PaymentHash, correctRHash) } // Finally, as we made a single-hop direct payment, there should have // been no fee applied. if p.Fee != 0 { t.Fatalf("incorrect Fee, got %v, want %v", p.Fee, 0) } // Delete all payments from Alice. DB should have no payments. delReq := &lnrpc.DeleteAllPaymentsRequest{} ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) _, err = net.Alice.DeleteAllPayments(ctxt, delReq) if err != nil { t.Fatalf("Can't delete payments at the end: %v", err) } // Check that there are no payments before test. listReq := &lnrpc.ListPaymentsRequest{} ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) paymentsResp, err = net.Alice.ListPayments(ctxt, listReq) if err != nil { t.Fatalf("error when obtaining Alice payments: %v", err) } if len(paymentsResp.Payments) != 0 { t.Fatalf("incorrect number of payments, got %v, want %v", len(paymentsRespInit.Payments), 0) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // assertAmountPaid checks that the ListChannels command of the provided // node list the total amount sent and received as expected for the // provided channel. func assertAmountPaid(t *harnessTest, channelName string, node *lntest.HarnessNode, chanPoint wire.OutPoint, amountSent, amountReceived int64) { ctxb := context.Background() checkAmountPaid := func() error { listReq := &lnrpc.ListChannelsRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) resp, err := node.ListChannels(ctxt, listReq) if err != nil { return fmt.Errorf("unable to for node's "+ "channels: %v", err) } for _, channel := range resp.Channels { if channel.ChannelPoint != chanPoint.String() { continue } if channel.TotalSatoshisSent != amountSent { return fmt.Errorf("%v: incorrect amount"+ " sent: %v != %v", channelName, channel.TotalSatoshisSent, amountSent) } if channel.TotalSatoshisReceived != amountReceived { return fmt.Errorf("%v: incorrect amount"+ " received: %v != %v", channelName, channel.TotalSatoshisReceived, amountReceived) } return nil } return fmt.Errorf("channel not found") } // As far as HTLC inclusion in commitment transaction might be // postponed we will try to check the balance couple of times, // and then if after some period of time we receive wrong // balance return the error. // TODO(roasbeef): remove sleep after invoice notification hooks // are in place var timeover uint32 go func() { <-time.After(time.Second * 20) atomic.StoreUint32(&timeover, 1) }() for { isTimeover := atomic.LoadUint32(&timeover) == 1 if err := checkAmountPaid(); err != nil { if isTimeover { t.Fatalf("Check amount Paid failed: %v", err) } } else { break } } } // updateChannelPolicy updates the channel policy of node to the // given fees and timelock delta. This function blocks until // listenerNode has received the policy update. func updateChannelPolicy(t *harnessTest, node *lntest.HarnessNode, chanPoint *lnrpc.ChannelPoint, baseFee int64, feeRate int64, timeLockDelta uint32, listenerNode *lntest.HarnessNode) { ctxb := context.Background() expectedPolicy := &lnrpc.RoutingPolicy{ FeeBaseMsat: baseFee, FeeRateMilliMsat: feeRate, TimeLockDelta: timeLockDelta, MinHtlc: 1000, // default value } updateFeeReq := &lnrpc.PolicyUpdateRequest{ BaseFeeMsat: baseFee, FeeRate: float64(feeRate) / testFeeBase, TimeLockDelta: timeLockDelta, Scope: &lnrpc.PolicyUpdateRequest_ChanPoint{ ChanPoint: chanPoint, }, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if _, err := node.UpdateChannelPolicy(ctxt, updateFeeReq); err != nil { t.Fatalf("unable to update chan policy: %v", err) } // Wait for listener node to receive the channel update from node. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) graphSub := subscribeGraphNotifications(t, ctxt, listenerNode) defer close(graphSub.quit) waitForChannelUpdate( t, graphSub, []expectedChanUpdate{ {node.PubKeyStr, expectedPolicy, chanPoint}, }, ) } func testMultiHopPayments(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // As preliminary setup, we'll create two new nodes: Carol and Dave, // such that we now have a 4 ndoe, 3 channel topology. Dave will make // a channel with Alice, and Carol with Dave. After this setup, the // network topology should now look like: // Carol -> Dave -> Alice -> Bob // // First, we'll create Dave and establish a channel to Alice. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel to from her to // Dave. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Create 5 invoices for Bob, which expect a payment from Carol for 1k // satoshis with a different preimage each time. const numPayments = 5 const paymentAmt = 1000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointDave) if err != nil { t.Fatalf("dave didn't advertise his channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel in time: %v", err) } time.Sleep(time.Millisecond * 50) // Set the fee policies of the Alice -> Bob and the Dave -> Alice // channel edges to relatively large non default values. This makes it // possible to pick up more subtle fee calculation errors. updateChannelPolicy(t, net.Alice, chanPointAlice, 1000, 100000, 144, carol) updateChannelPolicy(t, dave, chanPointDave, 5000, 150000, 144, carol) // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Bob, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Carol->David->Alice->Bob, order is Bob, // Alice, David, Carol. // The final node bob expects to get paid five times 1000 sat. expectedAmountPaidAtoB := int64(5 * 1000) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Bob, aliceFundPoint, int64(0), expectedAmountPaidAtoB) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Alice, aliceFundPoint, expectedAmountPaidAtoB, int64(0)) // To forward a payment of 1000 sat, Alice is charging a fee of // 1 sat + 10% = 101 sat. const expectedFeeAlice = 5 * 101 // Dave needs to pay what Alice pays plus Alice's fee. expectedAmountPaidDtoA := expectedAmountPaidAtoB + expectedFeeAlice assertAmountPaid(t, "Dave(local) => Alice(remote)", net.Alice, daveFundPoint, int64(0), expectedAmountPaidDtoA) assertAmountPaid(t, "Dave(local) => Alice(remote)", dave, daveFundPoint, expectedAmountPaidDtoA, int64(0)) // To forward a payment of 1101 sat, Dave is charging a fee of // 5 sat + 15% = 170.15 sat. This is rounded down in rpcserver to 170. const expectedFeeDave = 5 * 170 // Carol needs to pay what Dave pays plus Dave's fee. expectedAmountPaidCtoD := expectedAmountPaidDtoA + expectedFeeDave assertAmountPaid(t, "Carol(local) => Dave(remote)", dave, carolFundPoint, int64(0), expectedAmountPaidCtoD) assertAmountPaid(t, "Carol(local) => Dave(remote)", carol, carolFundPoint, expectedAmountPaidCtoD, int64(0)) // Now that we know all the balances have been settled out properly, // we'll ensure that our internal record keeping for completed circuits // was properly updated. // First, check that the FeeReport response shows the proper fees // accrued over each time range. Dave should've earned 170 satoshi for // each of the forwarded payments. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) feeReport, err := dave.FeeReport(ctxt, &lnrpc.FeeReportRequest{}) if err != nil { t.Fatalf("unable to query for fee report: %v", err) } if feeReport.DayFeeSum != uint64(expectedFeeDave) { t.Fatalf("fee mismatch: expected %v, got %v", expectedFeeDave, feeReport.DayFeeSum) } if feeReport.WeekFeeSum != uint64(expectedFeeDave) { t.Fatalf("fee mismatch: expected %v, got %v", expectedFeeDave, feeReport.WeekFeeSum) } if feeReport.MonthFeeSum != uint64(expectedFeeDave) { t.Fatalf("fee mismatch: expected %v, got %v", expectedFeeDave, feeReport.MonthFeeSum) } // Next, ensure that if we issue the vanilla query for the forwarding // history, it returns 5 values, and each entry is formatted properly. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) fwdingHistory, err := dave.ForwardingHistory( ctxt, &lnrpc.ForwardingHistoryRequest{}, ) if err != nil { t.Fatalf("unable to query for fee report: %v", err) } if len(fwdingHistory.ForwardingEvents) != 5 { t.Fatalf("wrong number of forwarding event: expected %v, "+ "got %v", 5, len(fwdingHistory.ForwardingEvents)) } expectedForwardingFee := uint64(expectedFeeDave / numPayments) for _, event := range fwdingHistory.ForwardingEvents { // Each event should show a fee of 170 satoshi. if event.Fee != expectedForwardingFee { t.Fatalf("fee mismatch: expected %v, got %v", expectedForwardingFee, event.Fee) } } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testSingleHopSendToRoute tests that payments are properly processed // through a provided route with a single hop. We'll create the // following network topology: // Alice --100k--> Bob // We'll query the daemon for routes from Alice to Bob and then // send payments through the route. func testSingleHopSendToRoute(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob} nodeNames := []string{"Alice", "Bob"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Query for routes to pay from Alice to Bob. // We set FinalCltvDelta to 144 since by default QueryRoutes returns // the last hop with a final cltv delta of 9 where as the default in // htlcswitch is 144. const paymentAmt = 1000 routesReq := &lnrpc.QueryRoutesRequest{ PubKey: net.Bob.PubKeyStr, Amt: paymentAmt, NumRoutes: 1, FinalCltvDelta: 144, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) routes, err := net.Alice.QueryRoutes(ctxt, routesReq) if err != nil { t.Fatalf("unable to get route: %v", err) } // Create 5 invoices for Bob, which expect a payment from Alice for 1k // satoshis with a different preimage each time. const numPayments = 5 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, rHashes, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("alice didn't advertise her channel in time: %v", err) } time.Sleep(time.Millisecond * 50) // Using Alice as the source, pay to the 5 invoices from Carol created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayStream, err := net.Alice.SendToRoute(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } for _, rHash := range rHashes { sendReq := &lnrpc.SendToRouteRequest{ PaymentHash: rHash, Routes: routes.Routes, } err := alicePayStream.Send(sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } } for range rHashes { resp, err := alicePayStream.Recv() if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError != "" { t.Fatalf("received payment error: %v", resp.PaymentError) } } // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Bob, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Alice->Bob, order is Bob and then Alice. const amountPaid = int64(5000) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Bob, aliceFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Alice, aliceFundPoint, amountPaid, int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) } // testMultiHopSendToRoute tests that payments are properly processed // through a provided route. We'll create the following network topology: // Alice --100k--> Bob --100k--> Carol // We'll query the daemon for routes from Alice to Carol and then // send payments through the routes. func testMultiHopSendToRoute(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // Create Carol and establish a channel from Bob. Bob is the sole funder // of the channel with 100k satoshis. The network topology should look like: // Alice -> Bob -> Carol carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Bob); err != nil { t.Fatalf("unable to connect carol to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, net.Bob) if err != nil { t.Fatalf("unable to send coins to bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointBob := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointBob) txidHash, err = getChanPointFundingTxid(chanPointBob) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } bobFundPoint := wire.OutPoint{ Hash: *bobChanTXID, Index: chanPointBob.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} nodeNames := []string{"Alice", "Bob", "Carol"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Query for routes to pay from Alice to Carol. // We set FinalCltvDelta to 144 since by default QueryRoutes returns // the last hop with a final cltv delta of 9 where as the default in // htlcswitch is 144. const paymentAmt = 1000 routesReq := &lnrpc.QueryRoutesRequest{ PubKey: carol.PubKeyStr, Amt: paymentAmt, NumRoutes: 1, FinalCltvDelta: 144, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) routes, err := net.Alice.QueryRoutes(ctxt, routesReq) if err != nil { t.Fatalf("unable to get route: %v", err) } // Create 5 invoices for Carol, which expect a payment from Alice for 1k // satoshis with a different preimage each time. const numPayments = 5 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, rHashes, _, err := createPayReqs( ctxt, carol, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointBob) if err != nil { t.Fatalf("bob didn't advertise his channel in time: %v", err) } time.Sleep(time.Millisecond * 50) // Using Alice as the source, pay to the 5 invoices from Carol created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayStream, err := net.Alice.SendToRoute(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } for _, rHash := range rHashes { sendReq := &lnrpc.SendToRouteRequest{ PaymentHash: rHash, Routes: routes.Routes, } err := alicePayStream.Send(sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } } for range rHashes { resp, err := alicePayStream.Recv() if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError != "" { t.Fatalf("received payment error: %v", resp.PaymentError) } } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Carol, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Alice->Bob->Carol, order is Carol, Bob, // Alice. const amountPaid = int64(5000) assertAmountPaid(t, "Bob(local) => Carol(remote)", carol, bobFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Bob(local) => Carol(remote)", net.Bob, bobFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Bob, aliceFundPoint, int64(0), amountPaid+(baseFee*numPayments)) assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Alice, aliceFundPoint, amountPaid+(baseFee*numPayments), int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointBob, false) } // testSendToRouteErrorPropagation tests propagation of errors that occur // while processing a multi-hop payment through an unknown route. func testSendToRouteErrorPropagation(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("alice didn't advertise her channel: %v", err) } // Create a new nodes (Carol and Charlie), load her with some funds, // then establish a connection between Carol and Charlie with a channel // that has identical capacity to the one created above.Then we will // get route via queryroutes call which will be fake route for Alice -> // Bob graph. // // The network topology should now look like: Alice -> Bob; Carol -> Charlie. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } charlie, err := net.NewNode("Charlie", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, charlie) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, charlie) if err != nil { t.Fatalf("unable to send coins to charlie: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, charlie); err != nil { t.Fatalf("unable to connect carol to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, charlie, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel: %v", err) } // Query routes from Carol to Charlie which will be an invalid route // for Alice -> Bob. fakeReq := &lnrpc.QueryRoutesRequest{ PubKey: charlie.PubKeyStr, Amt: int64(1), NumRoutes: 1, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) fakeRoute, err := carol.QueryRoutes(ctxt, fakeReq) if err != nil { t.Fatalf("unable get fake route: %v", err) } // Create 1 invoices for Bob, which expect a payment from Alice for 1k // satoshis const paymentAmt = 1000 invoice := &lnrpc.Invoice{ Memo: "testing", Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Bob.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } rHash := resp.RHash // Using Alice as the source, pay to the 5 invoices from Bob created above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayStream, err := net.Alice.SendToRoute(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } sendReq := &lnrpc.SendToRouteRequest{ PaymentHash: rHash, Routes: fakeRoute.Routes, } if err := alicePayStream.Send(sendReq); err != nil { t.Fatalf("unable to send payment: %v", err) } // At this place we should get an rpc error with notification // that edge is not found on hop(0) if _, err := alicePayStream.Recv(); err != nil && strings.Contains(err.Error(), "edge not found") { } else if err != nil { t.Fatalf("payment stream has been closed but fake route has consumed: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testUnannouncedChannels checks unannounced channels are not returned by // describeGraph RPC request unless explicity asked for. func testUnannouncedChannels(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() amount := maxBtcFundingAmount // Open a channel between Alice and Bob, ensuring the // channel has been opened properly. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanOpenUpdate, err := net.OpenChannel( ctxt, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: amount, }, ) if err != nil { t.Fatalf("unable to open channel: %v", err) } // Mine 2 blocks, and check that the channel is opened but not yet // announced to the network. mineBlocks(t, net, 2, 1) // One block is enough to make the channel ready for use, since the // nodes have defaultNumConfs=1 set. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) fundingChanPoint, err := net.WaitForChannelOpen(ctxt, chanOpenUpdate) if err != nil { t.Fatalf("error while waiting for channel open: %v", err) } // Alice should have 1 edge in her graph. req := &lnrpc.ChannelGraphRequest{ IncludeUnannounced: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err := net.Alice.DescribeGraph(ctxt, req) if err != nil { t.Fatalf("unable to query alice's graph: %v", err) } numEdges := len(chanGraph.Edges) if numEdges != 1 { t.Fatalf("expected to find 1 edge in the graph, found %d", numEdges) } // Channels should not be announced yet, hence Alice should have no // announced edges in her graph. req.IncludeUnannounced = false ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err = net.Alice.DescribeGraph(ctxt, req) if err != nil { t.Fatalf("unable to query alice's graph: %v", err) } numEdges = len(chanGraph.Edges) if numEdges != 0 { t.Fatalf("expected to find 0 announced edges in the graph, found %d", numEdges) } // Mine 4 more blocks, and check that the channel is now announced. mineBlocks(t, net, 4, 0) // Give the network a chance to learn that auth proof is confirmed. var predErr error err = lntest.WaitPredicate(func() bool { // The channel should now be announced. Check that Alice has 1 // announced edge. req.IncludeUnannounced = false ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err = net.Alice.DescribeGraph(ctxt, req) if err != nil { predErr = fmt.Errorf("unable to query alice's graph: %v", err) return false } numEdges = len(chanGraph.Edges) if numEdges != 1 { predErr = fmt.Errorf("expected to find 1 announced edge in "+ "the graph, found %d", numEdges) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // The channel should now be announced. Check that Alice has 1 announced // edge. req.IncludeUnannounced = false ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanGraph, err = net.Alice.DescribeGraph(ctxt, req) if err != nil { t.Fatalf("unable to query alice's graph: %v", err) } numEdges = len(chanGraph.Edges) if numEdges != 1 { t.Fatalf("expected to find 1 announced edge in the graph, found %d", numEdges) } // Close the channel used during the test. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, fundingChanPoint, false) } // testPrivateChannels tests that a private channel can be used for // routing by the two endpoints of the channel, but is not known by // the rest of the nodes in the graph. func testPrivateChannels(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) var networkChans []*lnrpc.ChannelPoint // We create the following topology: // // Dave --100k--> Alice --200k--> Bob // ^ ^ // | | // 100k 100k // | | // +---- Carol ----+ // // where the 100k channel between Carol and Alice is private. // Open a channel with 200k satoshis between Alice and Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt * 2, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // Create Dave, and a channel to Alice of 100k. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel from her to // Dave of 100k. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all these channels, as they // are all public. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Now create a _private_ channel directly between Carol and // Alice of 100k. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanOpenUpdate, err := net.OpenChannel( ctxt, carol, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, Private: true, }, ) if err != nil { t.Fatalf("unable to open channel: %v", err) } // One block is enough to make the channel ready for use, since the // nodes have defaultNumConfs=1 set. block := mineBlocks(t, net, 1, 1)[0] ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanPointPrivate, err := net.WaitForChannelOpen(ctxt, chanOpenUpdate) if err != nil { t.Fatalf("error while waiting for channel open: %v", err) } txidHash, err = getChanPointFundingTxid(chanPointPrivate) if err != nil { t.Fatalf("unable to get txid: %v", err) } fundingTxID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } assertTxInBlock(t, block, fundingTxID) // The channel should be listed in the peer information returned by // both peers. privateFundPoint := wire.OutPoint{ Hash: *fundingTxID, Index: chanPointPrivate.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.AssertChannelExists(ctxt, carol, &privateFundPoint) if err != nil { t.Fatalf("unable to assert channel existence: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.AssertChannelExists(ctxt, net.Alice, &privateFundPoint) if err != nil { t.Fatalf("unable to assert channel existence: %v", err) } // The channel should be available for payments between Carol and Alice. // We check this by sending payments from Carol to Bob, that // collectively would deplete at least one of Carol's channels. // Create 2 invoices for Bob, each of 70k satoshis. Since each of // Carol's channels is of size 100k, these payments cannot succeed // by only using one of the channels. const numPayments = 2 const paymentAmt = 70000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } time.Sleep(time.Millisecond * 50) // Let Carol pay the invoices. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // Bob should have received 140k satoshis from Alice. assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Bob, aliceFundPoint, int64(0), 2*paymentAmt) // Alice sent 140k to Bob. assertAmountPaid(t, "Alice(local) => Bob(remote)", net.Alice, aliceFundPoint, 2*paymentAmt, int64(0)) // Alice received 70k + fee from Dave. assertAmountPaid(t, "Dave(local) => Alice(remote)", net.Alice, daveFundPoint, int64(0), paymentAmt+baseFee) // Dave sent 70k+fee to Alice. assertAmountPaid(t, "Dave(local) => Alice(remote)", dave, daveFundPoint, paymentAmt+baseFee, int64(0)) // Dave received 70k+fee of two hops from Carol. assertAmountPaid(t, "Carol(local) => Dave(remote)", dave, carolFundPoint, int64(0), paymentAmt+baseFee*2) // Carol sent 70k+fee of two hops to Dave. assertAmountPaid(t, "Carol(local) => Dave(remote)", carol, carolFundPoint, paymentAmt+baseFee*2, int64(0)) // Alice received 70k+fee from Carol. assertAmountPaid(t, "Carol(local) [private=>] Alice(remote)", net.Alice, privateFundPoint, int64(0), paymentAmt+baseFee) // Carol sent 70k+fee to Alice. assertAmountPaid(t, "Carol(local) [private=>] Alice(remote)", carol, privateFundPoint, paymentAmt+baseFee, int64(0)) // Alice should also be able to route payments using this channel, // so send two payments of 60k back to Carol. const paymentAmt60k = 60000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err = createPayReqs( ctxt, carol, paymentAmt60k, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } time.Sleep(time.Millisecond * 50) // Let Bob pay the invoices. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Alice, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Finally, we make sure Dave and Bob does not know about the // private channel between Carol and Alice. We first mine // plenty of blocks, such that the channel would have been // announced in case it was public. mineBlocks(t, net, 10, 0) // We create a helper method to check how many edges each of the // nodes know about. Carol and Alice should know about 4, while // Bob and Dave should only know about 3, since one channel is // private. numChannels := func(node *lntest.HarnessNode, includeUnannounced bool) int { req := &lnrpc.ChannelGraphRequest{ IncludeUnannounced: includeUnannounced, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) chanGraph, err := node.DescribeGraph(ctxt, req) if err != nil { t.Fatalf("unable go describegraph: %v", err) } return len(chanGraph.Edges) } var predErr error err = lntest.WaitPredicate(func() bool { aliceChans := numChannels(net.Alice, true) if aliceChans != 4 { predErr = fmt.Errorf("expected Alice to know 4 edges, "+ "had %v", aliceChans) return false } alicePubChans := numChannels(net.Alice, false) if alicePubChans != 3 { predErr = fmt.Errorf("expected Alice to know 3 public edges, "+ "had %v", alicePubChans) return false } bobChans := numChannels(net.Bob, true) if bobChans != 3 { predErr = fmt.Errorf("expected Bob to know 3 edges, "+ "had %v", bobChans) return false } carolChans := numChannels(carol, true) if carolChans != 4 { predErr = fmt.Errorf("expected Carol to know 4 edges, "+ "had %v", carolChans) return false } carolPubChans := numChannels(carol, false) if carolPubChans != 3 { predErr = fmt.Errorf("expected Carol to know 3 public edges, "+ "had %v", carolPubChans) return false } daveChans := numChannels(dave, true) if daveChans != 3 { predErr = fmt.Errorf("expected Dave to know 3 edges, "+ "had %v", daveChans) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // Close all channels. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointPrivate, false) } // testInvoiceRoutingHints tests that the routing hints for an invoice are // created properly. func testInvoiceRoutingHints(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) // Throughout this test, we'll be opening a channel between Alice and // several other parties. // // First, we'll create a private channel between Alice and Bob. This // will be the only channel that will be considered as a routing hint // throughout this test. We'll include a push amount since we currently // require channels to have enough remote balance to cover the invoice's // payment. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointBob := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: chanAmt / 2, Private: true, }, ) // Then, we'll create Carol's node and open a public channel between her // and Alice. This channel will not be considered as a routing hint due // to it being public. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: chanAmt / 2, }, ) // We'll also create a public channel between Bob and Carol to ensure // that Bob gets selected as the only routing hint. We do this as // we should only include routing hints for nodes that are publicly // advertised, otherwise we'd end up leaking information about nodes // that wish to stay unadvertised. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointBobCarol := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: chanAmt / 2, }, ) // Then, we'll create Dave's node and open a private channel between him // and Alice. We will not include a push amount in order to not consider // this channel as a routing hint as it will not have enough remote // balance for the invoice's amount. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create dave's node: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, dave); err != nil { t.Fatalf("unable to connect alice to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, net.Alice, dave, lntest.OpenChannelParams{ Amt: chanAmt, Private: true, }, ) // Finally, we'll create Eve's node and open a private channel between // her and Alice. This time though, we'll take Eve's node down after the // channel has been created to avoid populating routing hints for // inactive channels. eve, err := net.NewNode("Eve", nil) if err != nil { t.Fatalf("unable to create eve's node: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, eve); err != nil { t.Fatalf("unable to connect alice to eve: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointEve := openChannelAndAssert( ctxt, t, net, net.Alice, eve, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: chanAmt / 2, Private: true, }, ) // Make sure all the channels have been opened. nodeNames := []string{"bob", "carol", "dave", "eve"} aliceChans := []*lnrpc.ChannelPoint{ chanPointBob, chanPointCarol, chanPointBobCarol, chanPointDave, chanPointEve, } for i, chanPoint := range aliceChans { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("timed out waiting for channel open between "+ "alice and %s: %v", nodeNames[i], err) } } // Now that the channels are open, we'll take down Eve's node. shutdownAndAssert(net, t, eve) // Create an invoice for Alice that will populate the routing hints. invoice := &lnrpc.Invoice{ Memo: "routing hints", Value: int64(chanAmt / 4), Private: true, } // Due to the way the channels were set up above, the channel between // Alice and Bob should be the only channel used as a routing hint. var predErr error var decoded *lnrpc.PayReq err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Alice.AddInvoice(ctxt, invoice) if err != nil { predErr = fmt.Errorf("unable to add invoice: %v", err) return false } // We'll decode the invoice's payment request to determine which // channels were used as routing hints. payReq := &lnrpc.PayReqString{ PayReq: resp.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) decoded, err = net.Alice.DecodePayReq(ctxt, payReq) if err != nil { predErr = fmt.Errorf("unable to decode payment "+ "request: %v", err) return false } if len(decoded.RouteHints) != 1 { predErr = fmt.Errorf("expected one route hint, got %d", len(decoded.RouteHints)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } hops := decoded.RouteHints[0].HopHints if len(hops) != 1 { t.Fatalf("expected one hop in route hint, got %d", len(hops)) } chanID := hops[0].ChanId // We'll need the short channel ID of the channel between Alice and Bob // to make sure the routing hint is for this channel. listReq := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) listResp, err := net.Alice.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to retrieve alice's channels: %v", err) } var aliceBobChanID uint64 for _, channel := range listResp.Channels { if channel.RemotePubkey == net.Bob.PubKeyStr { aliceBobChanID = channel.ChanId } } if aliceBobChanID == 0 { t.Fatalf("channel between alice and bob not found") } if chanID != aliceBobChanID { t.Fatalf("expected channel ID %d, got %d", aliceBobChanID, chanID) } // Now that we've confirmed the routing hints were added correctly, we // can close all the channels and shut down all the nodes created. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointBob, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointCarol, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPointBobCarol, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointDave, false) // The channel between Alice and Eve should be force closed since Eve // is offline. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointEve, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Alice, chanPointEve) } // testMultiHopOverPrivateChannels tests that private channels can be used as // intermediate hops in a route for payments. func testMultiHopOverPrivateChannels(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // We'll test that multi-hop payments over private channels work as // intended. To do so, we'll create the following topology: // private public private // Alice <--100k--> Bob <--100k--> Carol <--100k--> Dave const chanAmt = btcutil.Amount(100000) // First, we'll open a private channel between Alice and Bob with Alice // being the funder. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, Private: true, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("alice didn't see the channel alice <-> bob before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPointAlice) if err != nil { t.Fatalf("bob didn't see the channel alice <-> bob before "+ "timeout: %v", err) } // Retrieve Alice's funding outpoint. txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // Next, we'll create Carol's node and open a public channel between // her and Bob with Bob being the funder. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, carol); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointBob := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPointBob) if err != nil { t.Fatalf("bob didn't see the channel bob <-> carol before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointBob) if err != nil { t.Fatalf("carol didn't see the channel bob <-> carol before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointBob) if err != nil { t.Fatalf("alice didn't see the channel bob <-> carol before "+ "timeout: %v", err) } // Retrieve Bob's funding outpoint. txidHash, err = getChanPointFundingTxid(chanPointBob) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } bobFundPoint := wire.OutPoint{ Hash: *bobChanTXID, Index: chanPointBob.OutputIndex, } // Next, we'll create Dave's node and open a private channel between him // and Carol with Carol being the funder. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create dave's node: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, Private: true, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't see the channel carol <-> dave before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("dave didn't see the channel carol <-> dave before "+ "timeout: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointBob) if err != nil { t.Fatalf("dave didn't see the channel bob <-> carol before "+ "timeout: %v", err) } // Retrieve Carol's funding point. txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Now that all the channels are set up according to the topology from // above, we can proceed to test payments. We'll create an invoice for // Dave of 20k satoshis and pay it with Alice. Since there is no public // route from Alice to Dave, we'll need to use the private channel // between Carol and Dave as a routing hint encoded in the invoice. const paymentAmt = 20000 // Create the invoice for Dave. invoice := &lnrpc.Invoice{ Memo: "two hopz!", Value: paymentAmt, Private: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := dave.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice for dave: %v", err) } // Let Alice pay the invoice. payReqs := []string{resp.PaymentRequest} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Alice, payReqs, true) if err != nil { t.Fatalf("unable to send payments from alice to dave: %v", err) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when opening // the channels. const baseFee = 1 // Dave should have received 20k satoshis from Carol. assertAmountPaid(t, "Carol(local) [private=>] Dave(remote)", dave, carolFundPoint, 0, paymentAmt) // Carol should have sent 20k satoshis to Dave. assertAmountPaid(t, "Carol(local) [private=>] Dave(remote)", carol, carolFundPoint, paymentAmt, 0) // Carol should have received 20k satoshis + fee for one hop from Bob. assertAmountPaid(t, "Bob(local) => Carol(remote)", carol, bobFundPoint, 0, paymentAmt+baseFee) // Bob should have sent 20k satoshis + fee for one hop to Carol. assertAmountPaid(t, "Bob(local) => Carol(remote)", net.Bob, bobFundPoint, paymentAmt+baseFee, 0) // Bob should have received 20k satoshis + fee for two hops from Alice. assertAmountPaid(t, "Alice(local) [private=>] Bob(remote)", net.Bob, aliceFundPoint, 0, paymentAmt+baseFee*2) // Alice should have sent 20k satoshis + fee for two hops to Bob. assertAmountPaid(t, "Alice(local) [private=>] Bob(remote)", net.Alice, aliceFundPoint, paymentAmt+baseFee*2, 0) // At this point, the payment was successful. We can now close all the // channels and shutdown the nodes created throughout this test. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPointBob, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } func testInvoiceSubscriptions(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(500000) // Open a channel with 500k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Next create a new invoice for Bob requesting 1k satoshis. // TODO(roasbeef): make global list of invoices for each node to re-use // and avoid collisions const paymentAmt = 1000 invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: makeFakePayHash(t), Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) invoiceResp, err := net.Bob.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } lastAddIndex := invoiceResp.AddIndex // Create a new invoice subscription client for Bob, the notification // should be dispatched shortly below. req := &lnrpc.InvoiceSubscription{} ctx, cancelInvoiceSubscription := context.WithCancel(ctxb) bobInvoiceSubscription, err := net.Bob.SubscribeInvoices(ctx, req) if err != nil { t.Fatalf("unable to subscribe to bob's invoice updates: %v", err) } var settleIndex uint64 quit := make(chan struct{}) updateSent := make(chan struct{}) go func() { invoiceUpdate, err := bobInvoiceSubscription.Recv() select { case <-quit: // Received cancellation return default: } if err != nil { t.Fatalf("unable to recv invoice update: %v", err) } // The invoice update should exactly match the invoice created // above, but should now be settled and have SettleDate if !invoiceUpdate.Settled { t.Fatalf("invoice not settled but should be") } if invoiceUpdate.SettleDate == 0 { t.Fatalf("invoice should have non zero settle date, but doesn't") } if !bytes.Equal(invoiceUpdate.RPreimage, invoice.RPreimage) { t.Fatalf("payment preimages don't match: expected %v, got %v", invoice.RPreimage, invoiceUpdate.RPreimage) } if invoiceUpdate.SettleIndex == 0 { t.Fatalf("invoice should have settle index") } settleIndex = invoiceUpdate.SettleIndex close(updateSent) }() // Wait for the channel to be recognized by both Alice and Bob before // continuing the rest of the test. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { // TODO(roasbeef): will need to make num blocks to advertise a // node param close(quit) t.Fatalf("channel not seen by alice before timeout: %v", err) } // With the assertion above set up, send a payment from Alice to Bob // which should finalize and settle the invoice. sendReq := &lnrpc.SendRequest{ PaymentRequest: invoiceResp.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { close(quit) t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError != "" { close(quit) t.Fatalf("error when attempting recv: %v", resp.PaymentError) } select { case <-time.After(time.Second * 10): close(quit) t.Fatalf("update not sent after 10 seconds") case <-updateSent: // Fall through on success } // With the base case working, we'll now cancel Bob's current // subscription in order to exercise the backlog fill behavior. cancelInvoiceSubscription() // We'll now add 3 more invoices to Bob's invoice registry. const numInvoices = 3 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, newInvoices, err := createPayReqs( ctxt, net.Bob, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Now that the set of invoices has been added, we'll re-register for // streaming invoice notifications for Bob, this time specifying the // add invoice of the last prior invoice. req = &lnrpc.InvoiceSubscription{ AddIndex: lastAddIndex, } ctx, cancelInvoiceSubscription = context.WithCancel(ctxb) bobInvoiceSubscription, err = net.Bob.SubscribeInvoices(ctx, req) if err != nil { t.Fatalf("unable to subscribe to bob's invoice updates: %v", err) } // Since we specified a value of the prior add index above, we should // now immediately get the invoices we just added as we should get the // backlog of notifications. for i := 0; i < numInvoices; i++ { invoiceUpdate, err := bobInvoiceSubscription.Recv() if err != nil { t.Fatalf("unable to receive subscription") } // We should now get the ith invoice we added, as they should // be returned in order. if invoiceUpdate.Settled { t.Fatalf("should have only received add events") } originalInvoice := newInvoices[i] rHash := sha256.Sum256(originalInvoice.RPreimage[:]) if !bytes.Equal(invoiceUpdate.RHash, rHash[:]) { t.Fatalf("invoices have mismatched payment hashes: "+ "expected %x, got %x", rHash[:], invoiceUpdate.RHash) } } cancelInvoiceSubscription() // We'll now have Bob settle out the remainder of these invoices so we // can test that all settled invoices are properly notified. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, net.Alice, payReqs, true, ) if err != nil { t.Fatalf("unable to send payment: %v", err) } // With the set of invoices paid, we'll now cancel the old // subscription, and create a new one for Bob, this time using the // settle index to obtain the backlog of settled invoices. req = &lnrpc.InvoiceSubscription{ SettleIndex: settleIndex, } ctx, cancelInvoiceSubscription = context.WithCancel(ctxb) bobInvoiceSubscription, err = net.Bob.SubscribeInvoices(ctx, req) if err != nil { t.Fatalf("unable to subscribe to bob's invoice updates: %v", err) } defer cancelInvoiceSubscription() // As we specified the index of the past settle index, we should now // receive notifications for the three HTLCs that we just settled. As // the order that the HTLCs will be settled in is partially randomized, // we'll use a map to assert that the proper set has been settled. settledInvoices := make(map[[32]byte]struct{}) for _, invoice := range newInvoices { rHash := sha256.Sum256(invoice.RPreimage[:]) settledInvoices[rHash] = struct{}{} } for i := 0; i < numInvoices; i++ { invoiceUpdate, err := bobInvoiceSubscription.Recv() if err != nil { t.Fatalf("unable to receive subscription") } // We should now get the ith invoice we added, as they should // be returned in order. if !invoiceUpdate.Settled { t.Fatalf("should have only received settle events") } var rHash [32]byte copy(rHash[:], invoiceUpdate.RHash) if _, ok := settledInvoices[rHash]; !ok { t.Fatalf("unknown invoice settled: %x", rHash) } delete(settledInvoices, rHash) } // At this point, all the invoices should be fully settled. if len(settledInvoices) != 0 { t.Fatalf("not all invoices settled") } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // channelSubscription houses the proxied update and error chans for a node's // channel subscriptions. type channelSubscription struct { updateChan chan *lnrpc.ChannelEventUpdate errChan chan error quit chan struct{} } // subscribeChannelNotifications subscribes to channel updates and launches a // goroutine that forwards these to the returned channel. func subscribeChannelNotifications(ctxb context.Context, t *harnessTest, node *lntest.HarnessNode) channelSubscription { // We'll first start by establishing a notification client which will // send us notifications upon channels becoming active, inactive or // closed. req := &lnrpc.ChannelEventSubscription{} ctx, cancelFunc := context.WithCancel(ctxb) chanUpdateClient, err := node.SubscribeChannelEvents(ctx, req) if err != nil { t.Fatalf("unable to create channel update client: %v", err) } // We'll launch a goroutine that will be responsible for proxying all // notifications recv'd from the client into the channel below. errChan := make(chan error, 1) quit := make(chan struct{}) chanUpdates := make(chan *lnrpc.ChannelEventUpdate, 20) go func() { defer cancelFunc() for { select { case <-quit: return default: chanUpdate, err := chanUpdateClient.Recv() select { case <-quit: return default: } if err == io.EOF { return } else if err != nil { select { case errChan <- err: case <-quit: } return } select { case chanUpdates <- chanUpdate: case <-quit: return } } } }() return channelSubscription{ updateChan: chanUpdates, errChan: errChan, quit: quit, } } // verifyCloseUpdate is used to verify that a closed channel update is of the // expected type. func verifyCloseUpdate(chanUpdate *lnrpc.ChannelEventUpdate, force bool, forceType lnrpc.ChannelCloseSummary_ClosureType) error { // We should receive one inactive and one closed notification // for each channel. switch update := chanUpdate.Channel.(type) { case *lnrpc.ChannelEventUpdate_InactiveChannel: if chanUpdate.Type != lnrpc.ChannelEventUpdate_INACTIVE_CHANNEL { return fmt.Errorf("update type mismatch: expected %v, got %v", lnrpc.ChannelEventUpdate_INACTIVE_CHANNEL, chanUpdate.Type) } case *lnrpc.ChannelEventUpdate_ClosedChannel: if chanUpdate.Type != lnrpc.ChannelEventUpdate_CLOSED_CHANNEL { return fmt.Errorf("update type mismatch: expected %v, got %v", lnrpc.ChannelEventUpdate_CLOSED_CHANNEL, chanUpdate.Type) } switch force { case true: if update.ClosedChannel.CloseType != forceType { return fmt.Errorf("channel closure type mismatch: "+ "expected %v, got %v", forceType, update.ClosedChannel.CloseType) } case false: if update.ClosedChannel.CloseType != lnrpc.ChannelCloseSummary_COOPERATIVE_CLOSE { return fmt.Errorf("channel closure type "+ "mismatch: expected %v, got %v", lnrpc.ChannelCloseSummary_COOPERATIVE_CLOSE, update.ClosedChannel.CloseType) } } default: return fmt.Errorf("channel update channel of wrong type, "+ "expected closed channel, got %T", update) } return nil } // testBasicChannelCreationAndUpdates tests multiple channel opening and closing, // and ensures that if a node is subscribed to channel updates they will be // received correctly for both cooperative and force closed channels. func testBasicChannelCreationAndUpdates(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( numChannels = 2 amount = maxBtcFundingAmount ) // Let Bob subscribe to channel notifications. bobChanSub := subscribeChannelNotifications(ctxb, t, net.Bob) defer close(bobChanSub.quit) // Open the channel between Alice and Bob, asserting that the // channel has been properly open on-chain. chanPoints := make([]*lnrpc.ChannelPoint, numChannels) for i := 0; i < numChannels; i++ { ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoints[i] = openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: amount, }, ) } // Since each of the channels just became open, Bob should we receive an // open and an active notification for each channel. var numChannelUpds int for numChannelUpds < 2*numChannels { select { case update := <-bobChanSub.updateChan: switch update.Type { case lnrpc.ChannelEventUpdate_ACTIVE_CHANNEL: case lnrpc.ChannelEventUpdate_OPEN_CHANNEL: default: t.Fatalf("update type mismatch: expected open or active "+ "channel notification, got: %v", update.Type) } numChannelUpds++ case <-time.After(time.Second * 10): t.Fatalf("timeout waiting for channel notifications, "+ "only received %d/%d chanupds", numChannelUpds, numChannels) } } // Subscribe Alice to channel updates so we can test that both remote // and local force close notifications are received correctly. aliceChanSub := subscribeChannelNotifications(ctxb, t, net.Alice) defer close(aliceChanSub.quit) // Close the channel between Alice and Bob, asserting that the channel // has been properly closed on-chain. for i, chanPoint := range chanPoints { ctx, _ := context.WithTimeout(context.Background(), defaultTimeout) // Force close half of the channels. force := i%2 == 0 closeChannelAndAssert(ctx, t, net, net.Alice, chanPoint, force) if force { cleanupForceClose(t, net, net.Alice, chanPoint) } } // verifyCloseUpdatesReceived is used to verify that Alice and Bob // receive the correct channel updates in order. verifyCloseUpdatesReceived := func(sub channelSubscription, forceType lnrpc.ChannelCloseSummary_ClosureType) error { // Ensure one inactive and one closed notification is received for each // closed channel. numChannelUpds := 0 for numChannelUpds < 2*numChannels { // Every other channel should be force closed. force := (numChannelUpds/2)%2 == 0 select { case chanUpdate := <-sub.updateChan: err := verifyCloseUpdate(chanUpdate, force, forceType) if err != nil { return err } numChannelUpds++ case err := <-sub.errChan: return err case <-time.After(time.Second * 10): return fmt.Errorf("timeout waiting for channel "+ "notifications, only received %d/%d "+ "chanupds", numChannelUpds, 2*numChannels) } } return nil } // Verify Bob receives all closed channel notifications. He should // receive a remote force close notification for force closed channels. if err := verifyCloseUpdatesReceived(bobChanSub, lnrpc.ChannelCloseSummary_REMOTE_FORCE_CLOSE); err != nil { t.Fatalf("errored verifying close updates: %v", err) } // Verify Alice receives all closed channel notifications. She should // receive a remote force close notification for force closed channels. if err := verifyCloseUpdatesReceived(aliceChanSub, lnrpc.ChannelCloseSummary_LOCAL_FORCE_CLOSE); err != nil { t.Fatalf("errored verifying close updates: %v", err) } } // testMaxPendingChannels checks that error is returned from remote peer if // max pending channel number was exceeded and that '--maxpendingchannels' flag // exists and works properly. func testMaxPendingChannels(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() maxPendingChannels := defaultMaxPendingChannels + 1 amount := maxBtcFundingAmount // Create a new node (Carol) with greater number of max pending // channels. args := []string{ fmt.Sprintf("--maxpendingchannels=%v", maxPendingChannels), } carol, err := net.NewNode("Carol", args) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect carol to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalance := btcutil.Amount(maxPendingChannels) * amount if err := net.SendCoins(ctxt, carolBalance, carol); err != nil { t.Fatalf("unable to send coins to carol: %v", err) } // Send open channel requests without generating new blocks thereby // increasing pool of pending channels. Then check that we can't open // the channel if the number of pending channels exceed max value. openStreams := make([]lnrpc.Lightning_OpenChannelClient, maxPendingChannels) for i := 0; i < maxPendingChannels; i++ { ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) stream, err := net.OpenChannel( ctxt, net.Alice, carol, lntest.OpenChannelParams{ Amt: amount, }, ) if err != nil { t.Fatalf("unable to open channel: %v", err) } openStreams[i] = stream } // Carol exhausted available amount of pending channels, next open // channel request should cause ErrorGeneric to be sent back to Alice. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) _, err = net.OpenChannel( ctxt, net.Alice, carol, lntest.OpenChannelParams{ Amt: amount, }, ) if err == nil { t.Fatalf("error wasn't received") } else if grpc.Code(err) != lnwire.ErrMaxPendingChannels.ToGrpcCode() { t.Fatalf("not expected error was received: %v", err) } // For now our channels are in pending state, in order to not interfere // with other tests we should clean up - complete opening of the // channel and then close it. // Mine 6 blocks, then wait for node's to notify us that the channel has // been opened. The funding transactions should be found within the // first newly mined block. 6 blocks make sure the funding transaction // has enough confirmations to be announced publicly. block := mineBlocks(t, net, 6, maxPendingChannels)[0] chanPoints := make([]*lnrpc.ChannelPoint, maxPendingChannels) for i, stream := range openStreams { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) fundingChanPoint, err := net.WaitForChannelOpen(ctxt, stream) if err != nil { t.Fatalf("error while waiting for channel open: %v", err) } txidHash, err := getChanPointFundingTxid(fundingChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } fundingTxID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } // Ensure that the funding transaction enters a block, and is // properly advertised by Alice. assertTxInBlock(t, block, fundingTxID) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, fundingChanPoint) if err != nil { t.Fatalf("channel not seen on network before "+ "timeout: %v", err) } // The channel should be listed in the peer information // returned by both peers. chanPoint := wire.OutPoint{ Hash: *fundingTxID, Index: fundingChanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.AssertChannelExists(ctxt, net.Alice, &chanPoint); err != nil { t.Fatalf("unable to assert channel existence: %v", err) } chanPoints[i] = fundingChanPoint } // Next, close the channel between Alice and Carol, asserting that the // channel has been properly closed on-chain. for _, chanPoint := range chanPoints { ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } } // waitForTxInMempool polls until finding one transaction in the provided // miner's mempool. An error is returned if *one* transaction isn't found within // the given timeout. func waitForTxInMempool(miner *rpcclient.Client, timeout time.Duration) (*chainhash.Hash, error) { txs, err := waitForNTxsInMempool(miner, 1, timeout) if err != nil { return nil, err } return txs[0], err } // waitForNTxsInMempool polls until finding the desired number of transactions // in the provided miner's mempool. An error is returned if this number is not // met after the given timeout. func waitForNTxsInMempool(miner *rpcclient.Client, n int, timeout time.Duration) ([]*chainhash.Hash, error) { breakTimeout := time.After(timeout) ticker := time.NewTicker(50 * time.Millisecond) defer ticker.Stop() var err error var mempool []*chainhash.Hash for { select { case <-breakTimeout: return nil, fmt.Errorf("wanted %v, found %v txs "+ "in mempool: %v", n, len(mempool), mempool) case <-ticker.C: mempool, err = miner.GetRawMempool() if err != nil { return nil, err } if len(mempool) == n { return mempool, nil } } } } // testFailingChannel tests that we will fail the channel by force closing ii // in the case where a counterparty tries to settle an HTLC with the wrong // preimage. func testFailingChannel(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( paymentAmt = 10000 ) chanAmt := maxFundingAmount // We'll introduce Carol, which will settle any incoming invoice with a // totally unrelated preimage. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.bogus-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) // Let Alice connect and open a channel to Carol, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // With the channel open, we'll create a invoice for Carol that Alice // will attempt to pay. preimage := bytes.Repeat([]byte{byte(192)}, 32) invoice := &lnrpc.Invoice{ Memo: "testing", RPreimage: preimage, Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := carol.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } carolPayReqs := []string{resp.PaymentRequest} // Wait for Alice to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't see the alice->carol channel before "+ "timeout: %v", err) } // Send the payment from Alice to Carol. We expect Carol to attempt to // settle this payment with the wrong preimage. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Alice, carolPayReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Since Alice detects that Carol is trying to trick her by providing a // fake preimage, she should fail and force close the channel. var predErr error err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } n := len(pendingChanResp.WaitingCloseChannels) if n != 1 { predErr = fmt.Errorf("Expected to find %d channels "+ "waiting close, found %d", 1, n) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // Mine a block to confirm the broadcasted commitment. block := mineBlocks(t, net, 1, 1)[0] if len(block.Transactions) != 2 { t.Fatalf("transaction wasn't mined") } // The channel should now show up as force closed both for Alice and // Carol. err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } n := len(pendingChanResp.WaitingCloseChannels) if n != 0 { predErr = fmt.Errorf("Expected to find %d channels "+ "waiting close, found %d", 0, n) return false } n = len(pendingChanResp.PendingForceClosingChannels) if n != 1 { predErr = fmt.Errorf("expected to find %d channel "+ "pending force close, found %d", 1, n) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := carol.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } n := len(pendingChanResp.PendingForceClosingChannels) if n != 1 { predErr = fmt.Errorf("expected to find %d channel "+ "pending force close, found %d", 1, n) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // Carol will use the correct preimage to resolve the HTLC on-chain. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's resolve tx in mempool: %v", err) } // Mine enough blocks for Alice to sweep her funds from the force // closed channel. _, err = net.Miner.Node.Generate(defaultCSV) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Wait for the sweeping tx to be broadcast. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Alice's sweep tx in mempool: %v", err) } // Mine the sweep. _, err = net.Miner.Node.Generate(1) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } // No pending channels should be left. err = lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } n := len(pendingChanResp.PendingForceClosingChannels) if n != 0 { predErr = fmt.Errorf("expected to find %d channel "+ "pending force close, found %d", 0, n) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } } // testGarbageCollectLinkNodes tests that we properly garbase collect link nodes // from the database and the set of persistent connections within the server. func testGarbageCollectLinkNodes(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = 1000000 ) // Open a channel between Alice and Bob which will later be // cooperatively closed. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) coopChanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Create Carol's node and connect Alice to her. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice and carol: %v", err) } // Open a channel between Alice and Carol which will later be force // closed. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) forceCloseChanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Now, create Dave's a node and also open a channel between Alice and // him. This link will serve as the only persistent link throughout // restarts in this test. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create dave's node: %v", err) } defer shutdownAndAssert(net, t, dave) if err := net.ConnectNodes(ctxt, net.Alice, dave); err != nil { t.Fatalf("unable to connect alice to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) persistentChanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // isConnected is a helper closure that checks if a peer is connected to // Alice. isConnected := func(pubKey string) bool { req := &lnrpc.ListPeersRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := net.Alice.ListPeers(ctxt, req) if err != nil { t.Fatalf("unable to retrieve alice's peers: %v", err) } for _, peer := range resp.Peers { if peer.PubKey == pubKey { return true } } return false } // Restart both Bob and Carol to ensure Alice is able to reconnect to // them. if err := net.RestartNode(net.Bob, nil); err != nil { t.Fatalf("unable to restart bob's node: %v", err) } if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("unable to restart carol's node: %v", err) } err = lntest.WaitPredicate(func() bool { return isConnected(net.Bob.PubKeyStr) }, 15*time.Second) if err != nil { t.Fatalf("alice did not reconnect to bob") } err = lntest.WaitPredicate(func() bool { return isConnected(carol.PubKeyStr) }, 15*time.Second) if err != nil { t.Fatalf("alice did not reconnect to carol") } // We'll also restart Alice to ensure she can reconnect to her peers // with open channels. if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("unable to restart alice's node: %v", err) } err = lntest.WaitPredicate(func() bool { return isConnected(net.Bob.PubKeyStr) }, 15*time.Second) if err != nil { t.Fatalf("alice did not reconnect to bob") } err = lntest.WaitPredicate(func() bool { return isConnected(carol.PubKeyStr) }, 15*time.Second) if err != nil { t.Fatalf("alice did not reconnect to carol") } err = lntest.WaitPredicate(func() bool { return isConnected(dave.PubKeyStr) }, 15*time.Second) if err != nil { t.Fatalf("alice did not reconnect to dave") } // testReconnection is a helper closure that restarts the nodes at both // ends of a channel to ensure they do not reconnect after restarting. // When restarting Alice, we'll first need to ensure she has // reestablished her connection with Dave, as they still have an open // channel together. testReconnection := func(node *lntest.HarnessNode) { // Restart both nodes, to trigger the pruning logic. if err := net.RestartNode(node, nil); err != nil { t.Fatalf("unable to restart %v's node: %v", node.Name(), err) } if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("unable to restart alice's node: %v", err) } // Now restart both nodes and make sure they don't reconnect. if err := net.RestartNode(node, nil); err != nil { t.Fatalf("unable to restart %v's node: %v", node.Name(), err) } err = lntest.WaitInvariant(func() bool { return !isConnected(node.PubKeyStr) }, 5*time.Second) if err != nil { t.Fatalf("alice reconnected to %v", node.Name()) } if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("unable to restart alice's node: %v", err) } err = lntest.WaitPredicate(func() bool { return isConnected(dave.PubKeyStr) }, 20*time.Second) if err != nil { t.Fatalf("alice didn't reconnect to Dave") } err = lntest.WaitInvariant(func() bool { return !isConnected(node.PubKeyStr) }, 5*time.Second) if err != nil { t.Fatalf("alice reconnected to %v", node.Name()) } } // Now, we'll close the channel between Alice and Bob and ensure there // is no reconnection logic between the both once the channel is fully // closed. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, coopChanPoint, false) testReconnection(net.Bob) // We'll do the same with Alice and Carol, but this time we'll force // close the channel instead. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, forceCloseChanPoint, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Alice, forceCloseChanPoint) // We'll need to mine some blocks in order to mark the channel fully // closed. _, err = net.Miner.Node.Generate(defaultBitcoinTimeLockDelta - defaultCSV) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Before we test reconnection, we'll ensure that the channel has been // fully cleaned up for both Carol and Alice. var predErr error pendingChansRequest := &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Alice.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } predErr = checkNumForceClosedChannels(pendingChanResp, 0) if predErr != nil { return false } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err = carol.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } predErr = checkNumForceClosedChannels(pendingChanResp, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("channels not marked as fully resolved: %v", predErr) } testReconnection(carol) // Finally, we'll ensure that Bob and Carol no longer show in Alice's // channel graph. describeGraphReq := &lnrpc.ChannelGraphRequest{ IncludeUnannounced: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) channelGraph, err := net.Alice.DescribeGraph(ctxt, describeGraphReq) if err != nil { t.Fatalf("unable to query for alice's channel graph: %v", err) } for _, node := range channelGraph.Nodes { if node.PubKey == net.Bob.PubKeyStr { t.Fatalf("did not expect to find bob in the channel " + "graph, but did") } if node.PubKey == carol.PubKeyStr { t.Fatalf("did not expect to find carol in the channel " + "graph, but did") } } // Now that the test is done, we can also close the persistent link. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, persistentChanPoint, false) } // testRevokedCloseRetribution tests that Carol is able carry out // retribution in the event that she fails immediately after detecting Bob's // breach txn in the mempool. func testRevokedCloseRetribution(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = maxBtcFundingAmount paymentAmt = 10000 numInvoices = 6 ) // Carol will be the breached party. We set --nolisten to ensure Bob // won't be able to connect to her and trigger the channel data // protection logic automatically. carol, err := net.NewNode( "Carol", []string{"--debughtlc", "--hodl.exit-settle", "--nolisten"}, ) if err != nil { t.Fatalf("unable to create new carol node: %v", err) } defer shutdownAndAssert(net, t, carol) // We must let Bob communicate with Carol before they are able to open // channel, so we connect Bob and Carol, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Bob); err != nil { t.Fatalf("unable to connect dave to carol: %v", err) } // Before we make a channel, we'll load up Carol with some coins sent // directly from the miner. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } // In order to test Carol's response to an uncooperative channel // closure by Bob, we'll first open up a channel between them with a // 0.5 BTC value. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, carol, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // With the channel open, we'll create a few invoices for Bob that // Carol will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobPayReqs, _, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Wait for Carol to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("carol didn't see the carol->bob channel before "+ "timeout: %v", err) } // Send payments from Carol to Bob using 3 of Bob's payment hashes // generated above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, bobPayReqs[:numInvoices/2], true) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Next query for Bob's channel state, as we sent 3 payments of 10k // satoshis each, Bob should now see his balance as being 30k satoshis. var bobChan *lnrpc.Channel var predErr error err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bChan, err := getChanInfo(ctxt, net.Bob) if err != nil { t.Fatalf("unable to get bob's channel info: %v", err) } if bChan.LocalBalance != 30000 { predErr = fmt.Errorf("bob's balance is incorrect, "+ "got %v, expected %v", bChan.LocalBalance, 30000) return false } bobChan = bChan return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // Grab Bob's current commitment height (update number), we'll later // revert him to this state after additional updates to force him to // broadcast this soon to be revoked state. bobStateNumPreCopy := bobChan.NumUpdates // Create a temporary file to house Bob's database state at this // particular point in history. bobTempDbPath, err := ioutil.TempDir("", "bob-past-state") if err != nil { t.Fatalf("unable to create temp db folder: %v", err) } bobTempDbFile := filepath.Join(bobTempDbPath, "channel.db") defer os.Remove(bobTempDbPath) // With the temporary file created, copy Bob's current state into the // temporary file we created above. Later after more updates, we'll // restore this state. if err := lntest.CopyFile(bobTempDbFile, net.Bob.DBPath()); err != nil { t.Fatalf("unable to copy database files: %v", err) } // Finally, send payments from Carol to Bob, consuming Bob's remaining // payment hashes. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, bobPayReqs[numInvoices/2:], true) if err != nil { t.Fatalf("unable to send payments: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobChan, err = getChanInfo(ctxt, net.Bob) if err != nil { t.Fatalf("unable to get bob chan info: %v", err) } // Now we shutdown Bob, copying over the his temporary database state // which has the *prior* channel state over his current most up to date // state. With this, we essentially force Bob to travel back in time // within the channel's history. if err = net.RestartNode(net.Bob, func() error { return os.Rename(bobTempDbFile, net.Bob.DBPath()) }); err != nil { t.Fatalf("unable to restart node: %v", err) } // Now query for Bob's channel state, it should show that he's at a // state number in the past, not the *latest* state. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobChan, err = getChanInfo(ctxt, net.Bob) if err != nil { t.Fatalf("unable to get bob chan info: %v", err) } if bobChan.NumUpdates != bobStateNumPreCopy { t.Fatalf("db copy failed: %v", bobChan.NumUpdates) } // Now force Bob to execute a *force* channel closure by unilaterally // broadcasting his current channel state. This is actually the // commitment transaction of a prior *revoked* state, so he'll soon // feel the wrath of Carol's retribution. var closeUpdates lnrpc.Lightning_CloseChannelClient force := true err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, channelCloseTimeout) closeUpdates, _, err = net.CloseChannel(ctxt, net.Bob, chanPoint, force) if err != nil { predErr = err return false } return true }, time.Second*10) if err != nil { t.Fatalf("unable to close channel: %v", predErr) } // Wait for Bob's breach transaction to show up in the mempool to ensure // that Carol's node has started waiting for confirmations. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Bob's breach tx in mempool: %v", err) } // Here, Carol sees Bob's breach transaction in the mempool, but is waiting // for it to confirm before continuing her retribution. We restart Carol to // ensure that she is persisting her retribution state and continues // watching for the breach transaction to confirm even after her node // restarts. if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("unable to restart Carol's node: %v", err) } // Finally, generate a single block, wait for the final close status // update, then ensure that the closing transaction was included in the // block. block := mineBlocks(t, net, 1, 1)[0] ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) breachTXID, err := net.WaitForChannelClose(ctxt, closeUpdates) if err != nil { t.Fatalf("error while waiting for channel close: %v", err) } assertTxInBlock(t, block, breachTXID) // Query the mempool for Carol's justice transaction, this should be // broadcast as Bob's contract breaching transaction gets confirmed // above. justiceTXID, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's justice tx in mempool: %v", err) } time.Sleep(100 * time.Millisecond) // Query for the mempool transaction found above. Then assert that all // the inputs of this transaction are spending outputs generated by // Bob's breach transaction above. justiceTx, err := net.Miner.Node.GetRawTransaction(justiceTXID) if err != nil { t.Fatalf("unable to query for justice tx: %v", err) } for _, txIn := range justiceTx.MsgTx().TxIn { if !bytes.Equal(txIn.PreviousOutPoint.Hash[:], breachTXID[:]) { t.Fatalf("justice tx not spending commitment utxo "+ "instead is: %v", txIn.PreviousOutPoint) } } // We restart Carol here to ensure that she persists her retribution state // and successfully continues exacting retribution after restarting. At // this point, Carol has broadcast the justice transaction, but it hasn't // been confirmed yet; when Carol restarts, she should start waiting for // the justice transaction to confirm again. if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("unable to restart Carol's node: %v", err) } // Now mine a block, this transaction should include Carol's justice // transaction which was just accepted into the mempool. block = mineBlocks(t, net, 1, 1)[0] // The block should have exactly *two* transactions, one of which is // the justice transaction. if len(block.Transactions) != 2 { t.Fatalf("transaction wasn't mined") } justiceSha := block.Transactions[1].TxHash() if !bytes.Equal(justiceTx.Hash()[:], justiceSha[:]) { t.Fatalf("justice tx wasn't mined") } assertNodeNumChannels(t, carol, 0) } // testRevokedCloseRetributionZeroValueRemoteOutput tests that Dave is able // carry out retribution in the event that she fails in state where the remote // commitment output has zero-value. func testRevokedCloseRetributionZeroValueRemoteOutput(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = maxBtcFundingAmount paymentAmt = 10000 numInvoices = 6 ) // Since we'd like to test some multi-hop failure scenarios, we'll // introduce another node into our test network: Carol. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) // Dave will be the breached party. We set --nolisten to ensure Carol // won't be able to connect to him and trigger the channel data // protection logic automatically. dave, err := net.NewNode( "Dave", []string{"--debughtlc", "--hodl.exit-settle", "--nolisten"}, ) if err != nil { t.Fatalf("unable to create new node: %v", err) } defer shutdownAndAssert(net, t, dave) // We must let Dave have an open channel before she can send a node // announcement, so we open a channel with Carol, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, carol); err != nil { t.Fatalf("unable to connect dave to carol: %v", err) } // Before we make a channel, we'll load up Dave with some coins sent // directly from the miner. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } // In order to test Dave's response to an uncooperative channel // closure by Carol, we'll first open up a channel between them with a // 0.5 BTC value. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, dave, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // With the channel open, we'll create a few invoices for Carol that // Dave will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolPayReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Wait for Dave to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("dave didn't see the dave->carol channel before "+ "timeout: %v", err) } // Next query for Carol's channel state, as we sent 0 payments, Carol // should now see her balance as being 0 satoshis. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err := getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol's channel info: %v", err) } if carolChan.LocalBalance != 0 { t.Fatalf("carol's balance is incorrect, got %v, expected %v", carolChan.LocalBalance, 0) } // Grab Carol's current commitment height (update number), we'll later // revert her to this state after additional updates to force him to // broadcast this soon to be revoked state. carolStateNumPreCopy := carolChan.NumUpdates // Create a temporary file to house Carol's database state at this // particular point in history. carolTempDbPath, err := ioutil.TempDir("", "carol-past-state") if err != nil { t.Fatalf("unable to create temp db folder: %v", err) } carolTempDbFile := filepath.Join(carolTempDbPath, "channel.db") defer os.Remove(carolTempDbPath) // With the temporary file created, copy Carol's current state into the // temporary file we created above. Later after more updates, we'll // restore this state. if err := lntest.CopyFile(carolTempDbFile, carol.DBPath()); err != nil { t.Fatalf("unable to copy database files: %v", err) } // Finally, send payments from Dave to Carol, consuming Carol's remaining // payment hashes. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, dave, carolPayReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err = getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol chan info: %v", err) } // Now we shutdown Carol, copying over the his temporary database state // which has the *prior* channel state over his current most up to date // state. With this, we essentially force Carol to travel back in time // within the channel's history. if err = net.RestartNode(carol, func() error { return os.Rename(carolTempDbFile, carol.DBPath()) }); err != nil { t.Fatalf("unable to restart node: %v", err) } // Now query for Carol's channel state, it should show that he's at a // state number in the past, not the *latest* state. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err = getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol chan info: %v", err) } if carolChan.NumUpdates != carolStateNumPreCopy { t.Fatalf("db copy failed: %v", carolChan.NumUpdates) } // Now force Carol to execute a *force* channel closure by unilaterally // broadcasting his current channel state. This is actually the // commitment transaction of a prior *revoked* state, so he'll soon // feel the wrath of Dave's retribution. var ( closeUpdates lnrpc.Lightning_CloseChannelClient closeTxId *chainhash.Hash closeErr error force bool = true ) err = lntest.WaitPredicate(func() bool { ctxt, _ := context.WithTimeout(ctxb, channelCloseTimeout) closeUpdates, closeTxId, closeErr = net.CloseChannel( ctxt, carol, chanPoint, force, ) return closeErr == nil }, time.Second*15) if err != nil { t.Fatalf("unable to close channel: %v", closeErr) } // Query the mempool for the breaching closing transaction, this should // be broadcast by Carol when she force closes the channel above. txid, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's force close tx in mempool: %v", err) } if *txid != *closeTxId { t.Fatalf("expected closeTx(%v) in mempool, instead found %v", closeTxId, txid) } // Finally, generate a single block, wait for the final close status // update, then ensure that the closing transaction was included in the // block. block := mineBlocks(t, net, 1, 1)[0] // Here, Dave receives a confirmation of Carol's breach transaction. // We restart Dave to ensure that she is persisting her retribution // state and continues exacting justice after her node restarts. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to stop Dave's node: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) breachTXID, err := net.WaitForChannelClose(ctxt, closeUpdates) if err != nil { t.Fatalf("error while waiting for channel close: %v", err) } assertTxInBlock(t, block, breachTXID) // Query the mempool for Dave's justice transaction, this should be // broadcast as Carol's contract breaching transaction gets confirmed // above. justiceTXID, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Dave's justice tx in mempool: %v", err) } time.Sleep(100 * time.Millisecond) // Query for the mempool transaction found above. Then assert that all // the inputs of this transaction are spending outputs generated by // Carol's breach transaction above. justiceTx, err := net.Miner.Node.GetRawTransaction(justiceTXID) if err != nil { t.Fatalf("unable to query for justice tx: %v", err) } for _, txIn := range justiceTx.MsgTx().TxIn { if !bytes.Equal(txIn.PreviousOutPoint.Hash[:], breachTXID[:]) { t.Fatalf("justice tx not spending commitment utxo "+ "instead is: %v", txIn.PreviousOutPoint) } } // We restart Dave here to ensure that he persists her retribution state // and successfully continues exacting retribution after restarting. At // this point, Dave has broadcast the justice transaction, but it hasn't // been confirmed yet; when Dave restarts, she should start waiting for // the justice transaction to confirm again. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to restart Dave's node: %v", err) } // Now mine a block, this transaction should include Dave's justice // transaction which was just accepted into the mempool. block = mineBlocks(t, net, 1, 1)[0] // The block should have exactly *two* transactions, one of which is // the justice transaction. if len(block.Transactions) != 2 { t.Fatalf("transaction wasn't mined") } justiceSha := block.Transactions[1].TxHash() if !bytes.Equal(justiceTx.Hash()[:], justiceSha[:]) { t.Fatalf("justice tx wasn't mined") } assertNodeNumChannels(t, dave, 0) } // testRevokedCloseRetributionRemoteHodl tests that Dave properly responds to a // channel breach made by the remote party, specifically in the case that the // remote party breaches before settling extended HTLCs. func testRevokedCloseRetributionRemoteHodl(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = maxBtcFundingAmount pushAmt = 200000 paymentAmt = 10000 numInvoices = 6 ) // Since this test will result in the counterparty being left in a // weird state, we will introduce another node into our test network: // Carol. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) // We'll also create a new node Dave, who will have a channel with // Carol, and also use similar settings so we can broadcast a commit // with active HTLCs. Dave will be the breached party. We set // --nolisten to ensure Carol won't be able to connect to him and // trigger the channel data protection logic automatically. dave, err := net.NewNode( "Dave", []string{"--debughtlc", "--hodl.exit-settle", "--nolisten"}, ) if err != nil { t.Fatalf("unable to create new dave node: %v", err) } defer shutdownAndAssert(net, t, dave) // We must let Dave communicate with Carol before they are able to open // channel, so we connect Dave and Carol, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, carol); err != nil { t.Fatalf("unable to connect dave to carol: %v", err) } // Before we make a channel, we'll load up Dave with some coins sent // directly from the miner. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } // In order to test Dave's response to an uncooperative channel closure // by Carol, we'll first open up a channel between them with a // maxBtcFundingAmount (2^24) satoshis value. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, dave, carol, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) // With the channel open, we'll create a few invoices for Carol that // Dave will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolPayReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll introduce a closure to validate that Carol's current balance // matches the given expected amount. checkCarolBalance := func(expectedAmt int64) { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err := getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol's channel info: %v", err) } if carolChan.LocalBalance != expectedAmt { t.Fatalf("carol's balance is incorrect, "+ "got %v, expected %v", carolChan.LocalBalance, expectedAmt) } } // We'll introduce another closure to validate that Carol's current // number of updates is at least as large as the provided minimum // number. checkCarolNumUpdatesAtLeast := func(minimum uint64) { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err := getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol's channel info: %v", err) } if carolChan.NumUpdates < minimum { t.Fatalf("carol's numupdates is incorrect, want %v "+ "to be at least %v", carolChan.NumUpdates, minimum) } } // Wait for Dave to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("dave didn't see the dave->carol channel before "+ "timeout: %v", err) } // Ensure that carol's balance starts with the amount we pushed to her. checkCarolBalance(pushAmt) // Send payments from Dave to Carol using 3 of Carol's payment hashes // generated above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, dave, carolPayReqs[:numInvoices/2], false, ) if err != nil { t.Fatalf("unable to send payments: %v", err) } // At this point, we'll also send over a set of HTLC's from Carol to // Dave. This ensures that the final revoked transaction has HTLC's in // both directions. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) davePayReqs, _, _, err := createPayReqs( ctxt, dave, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Send payments from Carol to Dave using 3 of Dave's payment hashes // generated above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, carol, davePayReqs[:numInvoices/2], false, ) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Next query for Carol's channel state, as we sent 3 payments of 10k // satoshis each, however Carol should now see her balance as being // equal to the push amount in satoshis since she has not settled. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err := getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol's channel info: %v", err) } // Grab Carol's current commitment height (update number), we'll later // revert her to this state after additional updates to force her to // broadcast this soon to be revoked state. carolStateNumPreCopy := carolChan.NumUpdates // Ensure that carol's balance still reflects the original amount we // pushed to her, minus the HTLCs she just sent to Dave. checkCarolBalance(pushAmt - 3*paymentAmt) // Since Carol has not settled, she should only see at least one update // to her channel. checkCarolNumUpdatesAtLeast(1) // Create a temporary file to house Carol's database state at this // particular point in history. carolTempDbPath, err := ioutil.TempDir("", "carol-past-state") if err != nil { t.Fatalf("unable to create temp db folder: %v", err) } carolTempDbFile := filepath.Join(carolTempDbPath, "channel.db") defer os.Remove(carolTempDbPath) // With the temporary file created, copy Carol's current state into the // temporary file we created above. Later after more updates, we'll // restore this state. if err := lntest.CopyFile(carolTempDbFile, carol.DBPath()); err != nil { t.Fatalf("unable to copy database files: %v", err) } // Finally, send payments from Dave to Carol, consuming Carol's // remaining payment hashes. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests( ctxt, dave, carolPayReqs[numInvoices/2:], false, ) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Ensure that carol's balance still shows the amount we originally // pushed to her (minus the HTLCs she sent to Bob), and that at least // one more update has occurred. time.Sleep(500 * time.Millisecond) checkCarolBalance(pushAmt - 3*paymentAmt) checkCarolNumUpdatesAtLeast(carolStateNumPreCopy + 1) // Now we shutdown Carol, copying over the her temporary database state // which has the *prior* channel state over her current most up to date // state. With this, we essentially force Carol to travel back in time // within the channel's history. if err = net.RestartNode(carol, func() error { return os.Rename(carolTempDbFile, carol.DBPath()) }); err != nil { t.Fatalf("unable to restart node: %v", err) } time.Sleep(200 * time.Millisecond) // Ensure that Carol's view of the channel is consistent with the state // of the channel just before it was snapshotted. checkCarolBalance(pushAmt - 3*paymentAmt) checkCarolNumUpdatesAtLeast(1) // Now query for Carol's channel state, it should show that she's at a // state number in the past, *not* the latest state. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolChan, err = getChanInfo(ctxt, carol) if err != nil { t.Fatalf("unable to get carol chan info: %v", err) } if carolChan.NumUpdates != carolStateNumPreCopy { t.Fatalf("db copy failed: %v", carolChan.NumUpdates) } // Now force Carol to execute a *force* channel closure by unilaterally // broadcasting her current channel state. This is actually the // commitment transaction of a prior *revoked* state, so she'll soon // feel the wrath of Dave's retribution. force := true ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeUpdates, closeTxId, err := net.CloseChannel(ctxt, carol, chanPoint, force) if err != nil { t.Fatalf("unable to close channel: %v", err) } // Query the mempool for the breaching closing transaction, this should // be broadcast by Carol when she force closes the channel above. txid, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's force close tx in mempool: %v", err) } if *txid != *closeTxId { t.Fatalf("expected closeTx(%v) in mempool, instead found %v", closeTxId, txid) } time.Sleep(200 * time.Millisecond) // Generate a single block to mine the breach transaction. block := mineBlocks(t, net, 1, 1)[0] // Wait so Dave receives a confirmation of Carol's breach transaction. time.Sleep(200 * time.Millisecond) // We restart Dave to ensure that he is persisting his retribution // state and continues exacting justice after her node restarts. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to stop Dave's node: %v", err) } // Finally, wait for the final close status update, then ensure that // the closing transaction was included in the block. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) breachTXID, err := net.WaitForChannelClose(ctxt, closeUpdates) if err != nil { t.Fatalf("error while waiting for channel close: %v", err) } if *breachTXID != *closeTxId { t.Fatalf("expected breach ID(%v) to be equal to close ID (%v)", breachTXID, closeTxId) } assertTxInBlock(t, block, breachTXID) // Query the mempool for Dave's justice transaction, this should be // broadcast as Carol's contract breaching transaction gets confirmed // above. Since Carol might have had the time to take some of the HTLC // outputs to the second level before Dave broadcasts his justice tx, // we'll search through the mempool for a tx that matches the number of // expected inputs in the justice tx. var predErr error var justiceTxid *chainhash.Hash errNotFound := errors.New("justice tx not found") findJusticeTx := func() (*chainhash.Hash, error) { mempool, err := net.Miner.Node.GetRawMempool() if err != nil { return nil, fmt.Errorf("unable to get mempool from "+ "miner: %v", err) } for _, txid := range mempool { // Check that the justice tx has the appropriate number // of inputs. tx, err := net.Miner.Node.GetRawTransaction(txid) if err != nil { return nil, fmt.Errorf("unable to query for "+ "txs: %v", err) } exNumInputs := 2 + numInvoices if len(tx.MsgTx().TxIn) == exNumInputs { return txid, nil } } return nil, errNotFound } err = lntest.WaitPredicate(func() bool { txid, err := findJusticeTx() if err != nil { predErr = err return false } justiceTxid = txid return true }, time.Second*10) if err != nil && predErr == errNotFound { // If Dave is unable to broadcast his justice tx on first // attempt because of the second layer transactions, he will // wait until the next block epoch before trying again. Because // of this, we'll mine a block if we cannot find the justice tx // immediately. mineBlocks(t, net, 1, 1) err = lntest.WaitPredicate(func() bool { txid, err := findJusticeTx() if err != nil { predErr = err return false } justiceTxid = txid return true }, time.Second*10) } if err != nil { t.Fatalf(predErr.Error()) } justiceTx, err := net.Miner.Node.GetRawTransaction(justiceTxid) if err != nil { t.Fatalf("unable to query for justice tx: %v", err) } // isSecondLevelSpend checks that the passed secondLevelTxid is a // potentitial second level spend spending from the commit tx. isSecondLevelSpend := func(commitTxid, secondLevelTxid *chainhash.Hash) bool { secondLevel, err := net.Miner.Node.GetRawTransaction( secondLevelTxid) if err != nil { t.Fatalf("unable to query for tx: %v", err) } // A second level spend should have only one input, and one // output. if len(secondLevel.MsgTx().TxIn) != 1 { return false } if len(secondLevel.MsgTx().TxOut) != 1 { return false } // The sole input should be spending from the commit tx. txIn := secondLevel.MsgTx().TxIn[0] if !bytes.Equal(txIn.PreviousOutPoint.Hash[:], commitTxid[:]) { return false } return true } // Check that all the inputs of this transaction are spending outputs // generated by Carol's breach transaction above. for _, txIn := range justiceTx.MsgTx().TxIn { if bytes.Equal(txIn.PreviousOutPoint.Hash[:], breachTXID[:]) { continue } // If the justice tx is spending from an output that was not on // the breach tx, Carol might have had the time to take an // output to the second level. In that case, check that the // justice tx is spending this second level output. if isSecondLevelSpend(breachTXID, &txIn.PreviousOutPoint.Hash) { continue } t.Fatalf("justice tx not spending commitment utxo "+ "instead is: %v", txIn.PreviousOutPoint) } time.Sleep(100 * time.Millisecond) // We restart Dave here to ensure that he persists he retribution state // and successfully continues exacting retribution after restarting. At // this point, Dave has broadcast the justice transaction, but it // hasn't been confirmed yet; when Dave restarts, he should start // waiting for the justice transaction to confirm again. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to restart Dave's node: %v", err) } // Now mine a block, this transaction should include Dave's justice // transaction which was just accepted into the mempool. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, justiceTxid) // Dave should have no open channels. assertNodeNumChannels(t, dave, 0) } // assertNumPendingChannels checks that a PendingChannels response from the // node reports the expected number of pending channels. func assertNumPendingChannels(t *harnessTest, node *lntest.HarnessNode, expWaitingClose, expPendingForceClose int) { ctxb := context.Background() var predErr error err := lntest.WaitPredicate(func() bool { pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := node.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } n := len(pendingChanResp.WaitingCloseChannels) if n != expWaitingClose { predErr = fmt.Errorf("Expected to find %d channels "+ "waiting close, found %d", expWaitingClose, n) return false } n = len(pendingChanResp.PendingForceClosingChannels) if n != expPendingForceClose { predErr = fmt.Errorf("expected to find %d channel "+ "pending force close, found %d", expPendingForceClose, n) return false } return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } } // testDataLossProtection tests that if one of the nodes in a channel // relationship lost state, they will detect this during channel sync, and the // up-to-date party will force close the channel, giving the outdated party the // oppurtunity to sweep its output. func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = maxBtcFundingAmount paymentAmt = 10000 numInvoices = 6 ) // Carol will be the up-to-date party. We set --nolisten to ensure Dave // won't be able to connect to her and trigger the channel data // protection logic automatically. carol, err := net.NewNode("Carol", []string{"--nolisten"}) if err != nil { t.Fatalf("unable to create new carol node: %v", err) } defer shutdownAndAssert(net, t, carol) // Dave will be the party losing his state. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create new node: %v", err) } defer shutdownAndAssert(net, t, dave) // Before we make a channel, we'll load up Carol with some coins sent // directly from the miner. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } // timeTravel is a method that will make Carol open a channel to the // passed node, settle a series of payments, then reset the node back // to the state before the payments happened. When this method returns // the node will be unaware of the new state updates. The returned // function can be used to restart the node in this state. timeTravel := func(node *lntest.HarnessNode) (func() error, *lnrpc.ChannelPoint, int64, error) { // We must let the node communicate with Carol before they are // able to open channel, so we connect them. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.EnsureConnected(ctxt, carol, node); err != nil { t.Fatalf("unable to connect %v to carol: %v", node.Name(), err) } // We'll first open up a channel between them with a 0.5 BTC // value. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, carol, node, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // With the channel open, we'll create a few invoices for the // node that Carol will pay to in order to advance the state of // the channel. // TODO(halseth): have dangling HTLCs on the commitment, able to // retrive funds? ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, node, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Wait for Carol to receive the channel edge from the funding // manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("carol didn't see the carol->%s channel "+ "before timeout: %v", node.Name(), err) } // Send payments from Carol using 3 of the payment hashes // generated above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, payReqs[:numInvoices/2], true) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Next query for the node's channel state, as we sent 3 // payments of 10k satoshis each, it should now see his balance // as being 30k satoshis. var nodeChan *lnrpc.Channel var predErr error err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bChan, err := getChanInfo(ctxt, node) if err != nil { t.Fatalf("unable to get channel info: %v", err) } if bChan.LocalBalance != 30000 { predErr = fmt.Errorf("balance is incorrect, "+ "got %v, expected %v", bChan.LocalBalance, 30000) return false } nodeChan = bChan return true }, time.Second*15) if err != nil { t.Fatalf("%v", predErr) } // Grab the current commitment height (update number), we'll // later revert him to this state after additional updates to // revoke this state. stateNumPreCopy := nodeChan.NumUpdates // Create a temporary file to house the database state at this // particular point in history. tempDbPath, err := ioutil.TempDir("", node.Name()+"-past-state") if err != nil { t.Fatalf("unable to create temp db folder: %v", err) } tempDbFile := filepath.Join(tempDbPath, "channel.db") defer os.Remove(tempDbPath) // With the temporary file created, copy the current state into // the temporary file we created above. Later after more // updates, we'll restore this state. if err := lntest.CopyFile(tempDbFile, node.DBPath()); err != nil { t.Fatalf("unable to copy database files: %v", err) } // Finally, send more payments from , using the remaining // payment hashes. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, carol, payReqs[numInvoices/2:], true) if err != nil { t.Fatalf("unable to send payments: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) nodeChan, err = getChanInfo(ctxt, node) if err != nil { t.Fatalf("unable to get dave chan info: %v", err) } // Now we shutdown the node, copying over the its temporary // database state which has the *prior* channel state over his // current most up to date state. With this, we essentially // force the node to travel back in time within the channel's // history. if err = net.RestartNode(node, func() error { return os.Rename(tempDbFile, node.DBPath()) }); err != nil { t.Fatalf("unable to restart node: %v", err) } // Now query for the channel state, it should show that it's at // a state number in the past, not the *latest* state. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) nodeChan, err = getChanInfo(ctxt, node) if err != nil { t.Fatalf("unable to get dave chan info: %v", err) } if nodeChan.NumUpdates != stateNumPreCopy { t.Fatalf("db copy failed: %v", nodeChan.NumUpdates) } assertNodeNumChannels(t, node, 1) balReq := &lnrpc.WalletBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) balResp, err := node.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get dave's balance: %v", err) } restart, err := net.SuspendNode(node) if err != nil { t.Fatalf("unable to suspend node: %v", err) } return restart, chanPoint, balResp.ConfirmedBalance, nil } // Reset Dave to a state where he has an outdated channel state. restartDave, _, daveStartingBalance, err := timeTravel(dave) if err != nil { t.Fatalf("unable to time travel dave: %v", err) } // We a´make a note of the nodes' current on-chain balances, to make // sure they are able to retrieve the channel funds eventually, balReq := &lnrpc.WalletBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err := carol.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolStartingBalance := carolBalResp.ConfirmedBalance // Restart Dave to trigger a channel resync. if err := restartDave(); err != nil { t.Fatalf("unable to restart dave: %v", err) } // Upon reconnection, the nodes should detect that Dave is out of sync. // Carol should force close the channel using her latest commitment. forceClose, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's force close tx in mempool: %v", err) } // Channel should be in the state "waiting close" for Carol since she // broadcasted the force close tx. assertNumPendingChannels(t, carol, 1, 0) // Dave should also consider the channel "waiting close", as he noticed // the channel was out of sync, and is now waiting for a force close to // hit the chain. assertNumPendingChannels(t, dave, 1, 0) // Restart Dave to make sure he is able to sweep the funds after // shutdown. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Generate a single block, which should confirm the closing tx. block := mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, forceClose) // Dave should sweep his funds immediately, as they are not timelocked. daveSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Dave's sweep tx in mempool: %v", err) } // Dave should consider the channel pending force close (since he is // waiting for his sweep to confirm). assertNumPendingChannels(t, dave, 0, 1) // Carol is considering it "pending force close", as whe must wait // before she can sweep her outputs. assertNumPendingChannels(t, carol, 0, 1) // Mine the sweep tx. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, daveSweep) // Now Dave should consider the channel fully closed. assertNumPendingChannels(t, dave, 0, 0) // We query Dave's balance to make sure it increased after the channel // closed. This checks that he was able to sweep the funds he had in // the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) daveBalResp, err := dave.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get dave's balance: %v", err) } daveBalance := daveBalResp.ConfirmedBalance if daveBalance <= daveStartingBalance { t.Fatalf("expected dave to have balance above %d, intead had %v", daveStartingBalance, daveBalance) } // After the Carol's output matures, she should also reclaim her funds. mineBlocks(t, net, defaultCSV-1, 0) carolSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's sweep tx in mempool: %v", err) } block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, carolSweep) // Now the channel should be fully closed also from Carol's POV. assertNumPendingChannels(t, carol, 0, 0) // Make sure Carol got her balance back. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err = carol.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolBalance := carolBalResp.ConfirmedBalance if carolBalance <= carolStartingBalance { t.Fatalf("expected carol to have balance above %d, "+ "instead had %v", carolStartingBalance, carolBalance) } assertNodeNumChannels(t, dave, 0) assertNodeNumChannels(t, carol, 0) // As a second part of this test, we will test the the scenario where a // channel is closed while Dave is offline, loses his state and comes // back online. In this case the node should attempt to resync the // channel, and the peer should resend a channel sync message for the // closed channel, such that Dave can retrieve his funds. // // We start by letting Dave time travel back to an outdated state. restartDave, chanPoint2, daveStartingBalance, err := timeTravel(dave) if err != nil { t.Fatalf("unable to time travel eve: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err = carol.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolStartingBalance = carolBalResp.ConfirmedBalance // Now let Carol force close the channel while Dave is offline. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPoint2, true) // Wait for the channel to be marked pending force close. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = waitForChannelPendingForceClose(ctxt, carol, chanPoint2) if err != nil { t.Fatalf("channel not pending force close: %v", err) } // Mine enough blocks for Carol to sweep her funds. mineBlocks(t, net, defaultCSV, 0) carolSweep, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's sweep tx in mempool: %v", err) } block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, carolSweep) // Now the channel should be fully closed also from Carol's POV. assertNumPendingChannels(t, carol, 0, 0) // Make sure Carol got her balance back. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolBalResp, err = carol.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get carol's balance: %v", err) } carolBalance = carolBalResp.ConfirmedBalance if carolBalance <= carolStartingBalance { t.Fatalf("expected carol to have balance above %d, "+ "instead had %v", carolStartingBalance, carolBalance) } assertNodeNumChannels(t, carol, 0) // When Dave comes online, he will reconnect to Carol, try to resync // the channel, but it will already be closed. Carol should resend the // information Dave needs to sweep his funds. if err := restartDave(); err != nil { t.Fatalf("unabel to restart Eve: %v", err) } // Dave should sweep his funds. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Dave's sweep tx in mempool: %v", err) } // Mine a block to confirm the sweep, and make sure Dave got his // balance back. mineBlocks(t, net, 1, 1) assertNodeNumChannels(t, dave, 0) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) daveBalResp, err = dave.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get dave's balance: %v", err) } daveBalance = daveBalResp.ConfirmedBalance if daveBalance <= daveStartingBalance { t.Fatalf("expected dave to have balance above %d, intead had %v", daveStartingBalance, daveBalance) } } // assertNodeNumChannels polls the provided node's list channels rpc until it // reaches the desired number of total channels. func assertNodeNumChannels(t *harnessTest, node *lntest.HarnessNode, numChannels int) { ctxb := context.Background() // Poll node for its list of channels. req := &lnrpc.ListChannelsRequest{} var predErr error pred := func() bool { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) chanInfo, err := node.ListChannels(ctxt, req) if err != nil { predErr = fmt.Errorf("unable to query for node's "+ "channels: %v", err) return false } // Return true if the query returned the expected number of // channels. num := len(chanInfo.Channels) if num != numChannels { predErr = fmt.Errorf("expected %v channels, got %v", numChannels, num) return false } return true } if err := lntest.WaitPredicate(pred, time.Second*15); err != nil { t.Fatalf("node has incorrect number of channels: %v", predErr) } } func testHtlcErrorPropagation(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // In this test we wish to exercise the daemon's correct parsing, // handling, and propagation of errors that occur while processing a // multi-hop payment. const chanAmt = maxBtcFundingAmount // First establish a channel with a capacity of 0.5 BTC between Alice // and Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointAlice); err != nil { t.Fatalf("channel not seen by alice before timeout: %v", err) } commitFee := calcStaticFee(0) assertBaseBalance := func() { balReq := &lnrpc.ChannelBalanceRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceBal, err := net.Alice.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get channel balance: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobBal, err := net.Bob.ChannelBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get channel balance: %v", err) } if aliceBal.Balance != int64(chanAmt-commitFee) { t.Fatalf("alice has an incorrect balance: expected %v got %v", int64(chanAmt-commitFee), aliceBal) } if bobBal.Balance != int64(chanAmt-commitFee) { t.Fatalf("bob has an incorrect balance: expected %v got %v", int64(chanAmt-commitFee), bobBal) } } // Since we'd like to test some multi-hop failure scenarios, we'll // introduce another node into our test network: Carol. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } // Next, we'll create a connection from Bob to Carol, and open a // channel between them so we have the topology: Alice -> Bob -> Carol. // The channel created will be of lower capacity that the one created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, carol); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) const bobChanAmt = maxBtcFundingAmount chanPointBob := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Ensure that Alice has Carol in her routing table before proceeding. nodeInfoReq := &lnrpc.NodeInfoRequest{ PubKey: carol.PubKeyStr, } checkTableTimeout := time.After(time.Second * 10) checkTableTicker := time.NewTicker(100 * time.Millisecond) defer checkTableTicker.Stop() out: // TODO(roasbeef): make into async hook for node announcements for { select { case <-checkTableTicker.C: ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, err := net.Alice.GetNodeInfo(ctxt, nodeInfoReq) if err != nil && strings.Contains(err.Error(), "unable to find") { continue } break out case <-checkTableTimeout: t.Fatalf("carol's node announcement didn't propagate within " + "the timeout period") } } // With the channels, open we can now start to test our multi-hop error // scenarios. First, we'll generate an invoice from carol that we'll // use to test some error cases. const payAmt = 10000 invoiceReq := &lnrpc.Invoice{ Memo: "kek99", Value: payAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } // Before we send the payment, ensure that the announcement of the new // channel has been processed by Alice. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPointBob); err != nil { t.Fatalf("channel not seen by alice before timeout: %v", err) } // For the first scenario, we'll test the cancellation of an HTLC with // an unknown payment hash. // TODO(roasbeef): return failure response rather than failing entire // stream on payment error. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) sendReq := &lnrpc.SendRequest{ PaymentHashString: hex.EncodeToString(makeFakePayHash(t)), DestString: hex.EncodeToString(carol.PubKey[:]), Amt: payAmt, } resp, err := net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } // The payment should have resulted in an error since we sent it with the // wrong payment hash. if resp.PaymentError == "" { t.Fatalf("payment should have been rejected due to invalid " + "payment hash") } expectedErrorCode := lnwire.CodeUnknownPaymentHash.String() if !strings.Contains(resp.PaymentError, expectedErrorCode) { // TODO(roasbeef): make into proper gRPC error code t.Fatalf("payment should have failed due to unknown payment hash, "+ "instead failed due to: %v", resp.PaymentError) } // The balances of all parties should be the same as initially since // the HTLC was cancelled. assertBaseBalance() // Next, we'll test the case of a recognized payHash but, an incorrect // value on the extended HTLC. htlcAmt := lnwire.NewMSatFromSatoshis(1000) sendReq = &lnrpc.SendRequest{ PaymentHashString: hex.EncodeToString(carolInvoice.RHash), DestString: hex.EncodeToString(carol.PubKey[:]), Amt: int64(htlcAmt.ToSatoshis()), // 10k satoshis are expected. } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err = net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } // The payment should fail with an error since we sent 1k satoshis isn't of // 10k as was requested. if resp.PaymentError == "" { t.Fatalf("payment should have been rejected due to wrong " + "HTLC amount") } expectedErrorCode = lnwire.CodeUnknownPaymentHash.String() if !strings.Contains(resp.PaymentError, expectedErrorCode) { t.Fatalf("payment should have failed due to wrong amount, "+ "instead failed due to: %v", resp.PaymentError) } // We'll also ensure that the encoded error includes the invlaid HTLC // amount. if !strings.Contains(resp.PaymentError, htlcAmt.String()) { t.Fatalf("error didn't include expected payment amt of %v: "+ "%v", htlcAmt, resp.PaymentError) } // The balances of all parties should be the same as initially since // the HTLC was cancelled. assertBaseBalance() // Next we'll test an error that occurs mid-route due to an outgoing // link having insufficient capacity. In order to do so, we'll first // need to unbalance the link connecting Bob<->Carol. ctx, cancel := context.WithCancel(ctxb) defer cancel() bobPayStream, err := net.Bob.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream: %v", err) } // To do so, we'll push most of the funds in the channel over to // Alice's side, leaving on 10k satoshis of available balance for bob. // There's a max payment amount, so we'll have to do this // incrementally. chanReserve := int64(chanAmt / 100) amtToSend := int64(chanAmt) - chanReserve - 20000 amtSent := int64(0) for amtSent != amtToSend { // We'll send in chunks of the max payment amount. If we're // about to send too much, then we'll only send the amount // remaining. toSend := int64(maxPaymentMSat.ToSatoshis()) if toSend+amtSent > amtToSend { toSend = amtToSend - amtSent } invoiceReq = &lnrpc.Invoice{ Value: toSend, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolInvoice2, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } if err := bobPayStream.Send(&lnrpc.SendRequest{ PaymentRequest: carolInvoice2.PaymentRequest, }); err != nil { t.Fatalf("unable to send payment: %v", err) } if resp, err := bobPayStream.Recv(); err != nil { t.Fatalf("payment stream has been closed: %v", err) } else if resp.PaymentError != "" { t.Fatalf("bob's payment failed: %v", resp.PaymentError) } amtSent += toSend } // At this point, Alice has 50mil satoshis on her side of the channel, // but Bob only has 10k available on his side of the channel. So a // payment from Alice to Carol worth 100k satoshis should fail. invoiceReq = &lnrpc.Invoice{ Value: 100000, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolInvoice3, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } sendReq = &lnrpc.SendRequest{ PaymentRequest: carolInvoice3.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err = net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError == "" { t.Fatalf("payment should fail due to insufficient "+ "capacity: %v", err) } else if !strings.Contains(resp.PaymentError, lnwire.CodeTemporaryChannelFailure.String()) { t.Fatalf("payment should fail due to insufficient capacity, "+ "instead: %v", resp.PaymentError) } // Generate new invoice to not pay same invoice twice. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) carolInvoice, err = carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } // For our final test, we'll ensure that if a target link isn't // available for what ever reason then the payment fails accordingly. // // We'll attempt to complete the original invoice we created with Carol // above, but before we do so, Carol will go offline, resulting in a // failed payment. shutdownAndAssert(net, t, carol) // TODO(roasbeef): mission control time.Sleep(time.Second * 5) sendReq = &lnrpc.SendRequest{ PaymentRequest: carolInvoice.PaymentRequest, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err = net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } if resp.PaymentError == "" { t.Fatalf("payment should have failed") } expectedErrorCode = lnwire.CodeUnknownNextPeer.String() if !strings.Contains(resp.PaymentError, expectedErrorCode) { t.Fatalf("payment should fail due to unknown hop, instead: %v", resp.PaymentError) } // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) // Force close Bob's final channel. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPointBob, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Bob, chanPointBob) } // graphSubscription houses the proxied update and error chans for a node's // graph subscriptions. type graphSubscription struct { updateChan chan *lnrpc.GraphTopologyUpdate errChan chan error quit chan struct{} } // subscribeGraphNotifications subscribes to channel graph updates and launches // a goroutine that forwards these to the returned channel. func subscribeGraphNotifications(t *harnessTest, ctxb context.Context, node *lntest.HarnessNode) graphSubscription { // We'll first start by establishing a notification client which will // send us notifications upon detected changes in the channel graph. req := &lnrpc.GraphTopologySubscription{} ctx, cancelFunc := context.WithCancel(ctxb) topologyClient, err := node.SubscribeChannelGraph(ctx, req) if err != nil { t.Fatalf("unable to create topology client: %v", err) } // We'll launch a goroutine that will be responsible for proxying all // notifications recv'd from the client into the channel below. errChan := make(chan error, 1) quit := make(chan struct{}) graphUpdates := make(chan *lnrpc.GraphTopologyUpdate, 20) go func() { for { defer cancelFunc() select { case <-quit: return default: graphUpdate, err := topologyClient.Recv() select { case <-quit: return default: } if err == io.EOF { return } else if err != nil { select { case errChan <- err: case <-quit: } return } select { case graphUpdates <- graphUpdate: case <-quit: return } } } }() return graphSubscription{ updateChan: graphUpdates, errChan: errChan, quit: quit, } } func testGraphTopologyNotifications(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = maxBtcFundingAmount // Let Alice subscribe to graph notifications. graphSub := subscribeGraphNotifications( t, ctxb, net.Alice, ) defer close(graphSub.quit) // Open a new channel between Alice and Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // The channel opening above should have triggered a few notifications // sent to the notification client. We'll expect two channel updates, // and two node announcements. var numChannelUpds int var numNodeAnns int for numChannelUpds < 2 && numNodeAnns < 2 { select { // Ensure that a new update for both created edges is properly // dispatched to our registered client. case graphUpdate := <-graphSub.updateChan: // Process all channel updates prsented in this update // message. for _, chanUpdate := range graphUpdate.ChannelUpdates { switch chanUpdate.AdvertisingNode { case net.Alice.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown advertising node: %v", chanUpdate.AdvertisingNode) } switch chanUpdate.ConnectingNode { case net.Alice.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown connecting node: %v", chanUpdate.ConnectingNode) } if chanUpdate.Capacity != int64(chanAmt) { t.Fatalf("channel capacities mismatch:"+ " expected %v, got %v", chanAmt, btcutil.Amount(chanUpdate.Capacity)) } numChannelUpds++ } for _, nodeUpdate := range graphUpdate.NodeUpdates { switch nodeUpdate.IdentityKey { case net.Alice.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown node: %v", nodeUpdate.IdentityKey) } numNodeAnns++ } case err := <-graphSub.errChan: t.Fatalf("unable to recv graph update: %v", err) case <-time.After(time.Second * 10): t.Fatalf("timeout waiting for graph notifications, "+ "only received %d/2 chanupds and %d/2 nodeanns", numChannelUpds, numNodeAnns) } } _, blockHeight, err := net.Miner.Node.GetBestBlock() if err != nil { t.Fatalf("unable to get current blockheight %v", err) } // Now we'll test that updates are properly sent after channels are closed // within the network. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) // Now that the channel has been closed, we should receive a // notification indicating so. out: for { select { case graphUpdate := <-graphSub.updateChan: if len(graphUpdate.ClosedChans) != 1 { continue } closedChan := graphUpdate.ClosedChans[0] if closedChan.ClosedHeight != uint32(blockHeight+1) { t.Fatalf("close heights of channel mismatch: "+ "expected %v, got %v", blockHeight+1, closedChan.ClosedHeight) } chanPointTxid, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } closedChanTxid, err := getChanPointFundingTxid( closedChan.ChanPoint, ) if err != nil { t.Fatalf("unable to get txid: %v", err) } if !bytes.Equal(closedChanTxid, chanPointTxid) { t.Fatalf("channel point hash mismatch: "+ "expected %v, got %v", chanPointTxid, closedChanTxid) } if closedChan.ChanPoint.OutputIndex != chanPoint.OutputIndex { t.Fatalf("output index mismatch: expected %v, "+ "got %v", chanPoint.OutputIndex, closedChan.ChanPoint) } break out case err := <-graphSub.errChan: t.Fatalf("unable to recv graph update: %v", err) case <-time.After(time.Second * 10): t.Fatalf("notification for channel closure not " + "sent") } } // For the final portion of the test, we'll ensure that once a new node // appears in the network, the proper notification is dispatched. Note // that a node that does not have any channels open is ignored, so first // we disconnect Alice and Bob, open a channel between Bob and Carol, // and finally connect Alice to Bob again. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.DisconnectNodes(ctxt, net.Alice, net.Bob); err != nil { t.Fatalf("unable to disconnect alice and bob: %v", err) } carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, carol); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint = openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Reconnect Alice and Bob. This should result in the nodes syncing up // their respective graph state, with the new addition being the // existence of Carol in the graph, and also the channel between Bob // and Carol. Note that we will also receive a node announcement from // Bob, since a node will update its node announcement after a new // channel is opened. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.EnsureConnected(ctxt, net.Alice, net.Bob); err != nil { t.Fatalf("unable to connect alice to bob: %v", err) } // We should receive an update advertising the newly connected node, // Bob's new node announcement, and the channel between Bob and Carol. numNodeAnns = 0 numChannelUpds = 0 for numChannelUpds < 2 && numNodeAnns < 1 { select { case graphUpdate := <-graphSub.updateChan: for _, nodeUpdate := range graphUpdate.NodeUpdates { switch nodeUpdate.IdentityKey { case carol.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown node update pubey: %v", nodeUpdate.IdentityKey) } numNodeAnns++ } for _, chanUpdate := range graphUpdate.ChannelUpdates { switch chanUpdate.AdvertisingNode { case carol.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown advertising node: %v", chanUpdate.AdvertisingNode) } switch chanUpdate.ConnectingNode { case carol.PubKeyStr: case net.Bob.PubKeyStr: default: t.Fatalf("unknown connecting node: %v", chanUpdate.ConnectingNode) } if chanUpdate.Capacity != int64(chanAmt) { t.Fatalf("channel capacities mismatch:"+ " expected %v, got %v", chanAmt, btcutil.Amount(chanUpdate.Capacity)) } numChannelUpds++ } case err := <-graphSub.errChan: t.Fatalf("unable to recv graph update: %v", err) case <-time.After(time.Second * 10): t.Fatalf("timeout waiting for graph notifications, "+ "only received %d/2 chanupds and %d/2 nodeanns", numChannelUpds, numNodeAnns) } } // Close the channel between Bob and Carol. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPoint, false) } // testNodeAnnouncement ensures that when a node is started with one or more // external IP addresses specified on the command line, that those addresses // announced to the network and reported in the network graph. func testNodeAnnouncement(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() aliceSub := subscribeGraphNotifications(t, ctxb, net.Alice) defer close(aliceSub.quit) advertisedAddrs := []string{ "192.168.1.1:8333", "[2001:db8:85a3:8d3:1319:8a2e:370:7348]:8337", "bkb6azqggsaiskzi.onion:9735", "fomvuglh6h6vcag73xo5t5gv56ombih3zr2xvplkpbfd7wrog4swjwid.onion:1234", } var lndArgs []string for _, addr := range advertisedAddrs { lndArgs = append(lndArgs, "--externalip="+addr) } dave, err := net.NewNode("Dave", lndArgs) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) // We must let Dave have an open channel before he can send a node // announcement, so we open a channel with Bob, ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, dave); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Bob, dave, lntest.OpenChannelParams{ Amt: 1000000, }, ) // When Alice now connects with Dave, Alice will get his node // announcement. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, dave); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } assertAddrs := func(addrsFound []string, targetAddrs ...string) { addrs := make(map[string]struct{}, len(addrsFound)) for _, addr := range addrsFound { addrs[addr] = struct{}{} } for _, addr := range targetAddrs { if _, ok := addrs[addr]; !ok { t.Fatalf("address %v not found in node "+ "announcement", addr) } } } waitForAddrsInUpdate := func(graphSub graphSubscription, nodePubKey string, targetAddrs ...string) { for { select { case graphUpdate := <-graphSub.updateChan: for _, update := range graphUpdate.NodeUpdates { if update.IdentityKey == nodePubKey { assertAddrs( update.Addresses, targetAddrs..., ) return } } case err := <-graphSub.errChan: t.Fatalf("unable to recv graph update: %v", err) case <-time.After(20 * time.Second): t.Fatalf("did not receive node ann update") } } } waitForAddrsInUpdate( aliceSub, dave.PubKeyStr, advertisedAddrs..., ) // Close the channel between Bob and Dave. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPoint, false) } func testNodeSignVerify(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() chanAmt := maxBtcFundingAmount pushAmt := btcutil.Amount(100000) // Create a channel between alice and bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) aliceBobCh := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) aliceMsg := []byte("alice msg") // alice signs "alice msg" and sends her signature to bob. sigReq := &lnrpc.SignMessageRequest{Msg: aliceMsg} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) sigResp, err := net.Alice.SignMessage(ctxt, sigReq) if err != nil { t.Fatalf("SignMessage rpc call failed: %v", err) } aliceSig := sigResp.Signature // bob verifying alice's signature should succeed since alice and bob are // connected. verifyReq := &lnrpc.VerifyMessageRequest{Msg: aliceMsg, Signature: aliceSig} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) verifyResp, err := net.Bob.VerifyMessage(ctxt, verifyReq) if err != nil { t.Fatalf("VerifyMessage failed: %v", err) } if !verifyResp.Valid { t.Fatalf("alice's signature didn't validate") } if verifyResp.Pubkey != net.Alice.PubKeyStr { t.Fatalf("alice's signature doesn't contain alice's pubkey.") } // carol is a new node that is unconnected to alice or bob. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new node: %v", err) } defer shutdownAndAssert(net, t, carol) carolMsg := []byte("carol msg") // carol signs "carol msg" and sends her signature to bob. sigReq = &lnrpc.SignMessageRequest{Msg: carolMsg} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) sigResp, err = carol.SignMessage(ctxt, sigReq) if err != nil { t.Fatalf("SignMessage rpc call failed: %v", err) } carolSig := sigResp.Signature // bob verifying carol's signature should fail since they are not connected. verifyReq = &lnrpc.VerifyMessageRequest{Msg: carolMsg, Signature: carolSig} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) verifyResp, err = net.Bob.VerifyMessage(ctxt, verifyReq) if err != nil { t.Fatalf("VerifyMessage failed: %v", err) } if verifyResp.Valid { t.Fatalf("carol's signature should not be valid") } if verifyResp.Pubkey != carol.PubKeyStr { t.Fatalf("carol's signature doesn't contain her pubkey") } // Close the channel between alice and bob. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, aliceBobCh, false) } // testAsyncPayments tests the performance of the async payments, and also // checks that balances of both sides can't be become negative under stress // payment strikes. func testAsyncPayments(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( paymentAmt = 100 ) // First establish a channel with a capacity equals to the overall // amount of payments, between Alice and Bob, at the end of the test // Alice should send all money from her side to Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) channelCapacity := btcutil.Amount(paymentAmt * 2000) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: channelCapacity, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) info, err := getChanInfo(ctxt, net.Alice) if err != nil { t.Fatalf("unable to get alice channel info: %v", err) } // Calculate the number of invoices. We will deplete the channel // all the way down to the channel reserve. chanReserve := channelCapacity / 100 availableBalance := btcutil.Amount(info.LocalBalance) - chanReserve numInvoices := int(availableBalance / paymentAmt) bobAmt := int64(numInvoices * paymentAmt) aliceAmt := info.LocalBalance - bobAmt // Send one more payment in order to cause insufficient capacity error. numInvoices++ // With the channel open, we'll create invoices for Bob that Alice // will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobPayReqs, _, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Wait for Alice to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't see the alice->bob channel before "+ "timeout: %v", err) } // Open up a payment stream to Alice that we'll use to send payment to // Bob. We also create a small helper function to send payments to Bob, // consuming the payment hashes we generated above. ctxt, _ = context.WithTimeout(ctxb, time.Minute) alicePayStream, err := net.Alice.SendPayment(ctxt) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } // Send payments from Alice to Bob using of Bob's payment hashes // generated above. now := time.Now() for i := 0; i < numInvoices; i++ { sendReq := &lnrpc.SendRequest{ PaymentRequest: bobPayReqs[i], } if err := alicePayStream.Send(sendReq); err != nil { t.Fatalf("unable to send payment: "+ "stream has been closed: %v", err) } } // We should receive one insufficient capacity error, because we sent // one more payment than we can actually handle with the current // channel capacity. errorReceived := false for i := 0; i < numInvoices; i++ { if resp, err := alicePayStream.Recv(); err != nil { t.Fatalf("payment stream have been closed: %v", err) } else if resp.PaymentError != "" { if errorReceived { t.Fatalf("redundant payment error: %v", resp.PaymentError) } errorReceived = true continue } } if !errorReceived { t.Fatalf("insufficient capacity error haven't been received") } // All payments have been sent, mark the finish time. timeTaken := time.Since(now) // Next query for Bob's and Alice's channel states, in order to confirm // that all payment have been successful transmitted. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceChan, err := getChanInfo(ctxt, net.Alice) if len(aliceChan.PendingHtlcs) != 0 { t.Fatalf("alice's pending htlcs is incorrect, got %v, "+ "expected %v", len(aliceChan.PendingHtlcs), 0) } if err != nil { t.Fatalf("unable to get bob's channel info: %v", err) } if aliceChan.RemoteBalance != bobAmt { t.Fatalf("alice's remote balance is incorrect, got %v, "+ "expected %v", aliceChan.RemoteBalance, bobAmt) } if aliceChan.LocalBalance != aliceAmt { t.Fatalf("alice's local balance is incorrect, got %v, "+ "expected %v", aliceChan.LocalBalance, aliceAmt) } // Wait for Bob to receive revocation from Alice. time.Sleep(2 * time.Second) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobChan, err := getChanInfo(ctxt, net.Bob) if err != nil { t.Fatalf("unable to get bob's channel info: %v", err) } if len(bobChan.PendingHtlcs) != 0 { t.Fatalf("bob's pending htlcs is incorrect, got %v, "+ "expected %v", len(bobChan.PendingHtlcs), 0) } if bobChan.LocalBalance != bobAmt { t.Fatalf("bob's local balance is incorrect, got %v, expected"+ " %v", bobChan.LocalBalance, bobAmt) } if bobChan.RemoteBalance != aliceAmt { t.Fatalf("bob's remote balance is incorrect, got %v, "+ "expected %v", bobChan.RemoteBalance, aliceAmt) } t.Log("\tBenchmark info: Elapsed time: ", timeTaken) t.Log("\tBenchmark info: TPS: ", float64(numInvoices)/float64(timeTaken.Seconds())) // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // testBidirectionalAsyncPayments tests that nodes are able to send the // payments to each other in async manner without blocking. func testBidirectionalAsyncPayments(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( paymentAmt = 1000 ) // First establish a channel with a capacity equals to the overall // amount of payments, between Alice and Bob, at the end of the test // Alice should send all money from her side to Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: paymentAmt * 2000, PushAmt: paymentAmt * 1000, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) info, err := getChanInfo(ctxt, net.Alice) if err != nil { t.Fatalf("unable to get alice channel info: %v", err) } // Calculate the number of invoices. numInvoices := int(info.LocalBalance / paymentAmt) // Nodes should exchange the same amount of money and because of this // at the end balances should remain the same. aliceAmt := info.LocalBalance bobAmt := info.RemoteBalance // With the channel open, we'll create invoices for Bob that Alice // will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobPayReqs, _, _, err := createPayReqs( ctxt, net.Bob, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // With the channel open, we'll create invoices for Alice that Bob // will pay to in order to advance the state of the channel. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePayReqs, _, _, err := createPayReqs( ctxt, net.Alice, paymentAmt, numInvoices, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // Wait for Alice to receive the channel edge from the funding manager. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err = net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint); err != nil { t.Fatalf("alice didn't see the alice->bob channel before "+ "timeout: %v", err) } if err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint); err != nil { t.Fatalf("bob didn't see the bob->alice channel before "+ "timeout: %v", err) } // Open up a payment streams to Alice and to Bob, that we'll use to // send payment between nodes. ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } ctx, cancel = context.WithCancel(ctxb) defer cancel() bobPayStream, err := net.Bob.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for bob: %v", err) } // Send payments from Alice to Bob and from Bob to Alice in async // manner. for i := 0; i < numInvoices; i++ { aliceSendReq := &lnrpc.SendRequest{ PaymentRequest: bobPayReqs[i], } bobSendReq := &lnrpc.SendRequest{ PaymentRequest: alicePayReqs[i], } if err := alicePayStream.Send(aliceSendReq); err != nil { t.Fatalf("unable to send payment: "+ "%v", err) } if err := bobPayStream.Send(bobSendReq); err != nil { t.Fatalf("unable to send payment: "+ "%v", err) } } errChan := make(chan error) go func() { for i := 0; i < numInvoices; i++ { if resp, err := alicePayStream.Recv(); err != nil { errChan <- errors.Errorf("payment stream has"+ " been closed: %v", err) return } else if resp.PaymentError != "" { errChan <- errors.Errorf("unable to send "+ "payment from alice to bob: %v", resp.PaymentError) return } } errChan <- nil }() go func() { for i := 0; i < numInvoices; i++ { if resp, err := bobPayStream.Recv(); err != nil { errChan <- errors.Errorf("payment stream has"+ " been closed: %v", err) return } else if resp.PaymentError != "" { errChan <- errors.Errorf("unable to send "+ "payment from bob to alice: %v", resp.PaymentError) return } } errChan <- nil }() // Wait for Alice and Bob receive their payments, and throw and error // if something goes wrong. maxTime := 60 * time.Second for i := 0; i < 2; i++ { select { case err := <-errChan: if err != nil { t.Fatalf(err.Error()) } case <-time.After(maxTime): t.Fatalf("waiting for payments to finish too long "+ "(%v)", maxTime) } } // Wait for Alice and Bob to receive revocations messages, and update // states, i.e. balance info. time.Sleep(1 * time.Second) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceInfo, err := getChanInfo(ctxt, net.Alice) if err != nil { t.Fatalf("unable to get bob's channel info: %v", err) } if aliceInfo.RemoteBalance != bobAmt { t.Fatalf("alice's remote balance is incorrect, got %v, "+ "expected %v", aliceInfo.RemoteBalance, bobAmt) } if aliceInfo.LocalBalance != aliceAmt { t.Fatalf("alice's local balance is incorrect, got %v, "+ "expected %v", aliceInfo.LocalBalance, aliceAmt) } if len(aliceInfo.PendingHtlcs) != 0 { t.Fatalf("alice's pending htlcs is incorrect, got %v, "+ "expected %v", len(aliceInfo.PendingHtlcs), 0) } // Next query for Bob's and Alice's channel states, in order to confirm // that all payment have been successful transmitted. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) bobInfo, err := getChanInfo(ctxt, net.Bob) if err != nil { t.Fatalf("unable to get bob's channel info: %v", err) } if bobInfo.LocalBalance != bobAmt { t.Fatalf("bob's local balance is incorrect, got %v, expected"+ " %v", bobInfo.LocalBalance, bobAmt) } if bobInfo.RemoteBalance != aliceAmt { t.Fatalf("bob's remote balance is incorrect, got %v, "+ "expected %v", bobInfo.RemoteBalance, aliceAmt) } if len(bobInfo.PendingHtlcs) != 0 { t.Fatalf("bob's pending htlcs is incorrect, got %v, "+ "expected %v", len(bobInfo.PendingHtlcs), 0) } // Finally, immediately close the channel. This function will also // block until the channel is closed and will additionally assert the // relevant channel closing post conditions. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPoint, false) } // assertActiveHtlcs makes sure all the passed nodes have the _exact_ HTLCs // matching payHashes on _all_ their channels. func assertActiveHtlcs(nodes []*lntest.HarnessNode, payHashes ...[]byte) error { ctxb := context.Background() req := &lnrpc.ListChannelsRequest{} for _, node := range nodes { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) nodeChans, err := node.ListChannels(ctxt, req) if err != nil { return fmt.Errorf("unable to get node chans: %v", err) } for _, channel := range nodeChans.Channels { // Record all payment hashes active for this channel. htlcHashes := make(map[string]struct{}) for _, htlc := range channel.PendingHtlcs { _, ok := htlcHashes[string(htlc.HashLock)] if ok { return fmt.Errorf("duplicate HashLock") } htlcHashes[string(htlc.HashLock)] = struct{}{} } // Channel should have exactly the payHashes active. if len(payHashes) != len(htlcHashes) { return fmt.Errorf("node %x had %v htlcs active, "+ "expected %v", node.PubKey[:], len(htlcHashes), len(payHashes)) } // Make sure all the payHashes are active. for _, payHash := range payHashes { if _, ok := htlcHashes[string(payHash)]; ok { continue } return fmt.Errorf("node %x didn't have the "+ "payHash %v active", node.PubKey[:], payHash) } } } return nil } func assertNumActiveHtlcsChanPoint(node *lntest.HarnessNode, chanPoint wire.OutPoint, numHtlcs int) error { ctxb := context.Background() req := &lnrpc.ListChannelsRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) nodeChans, err := node.ListChannels(ctxt, req) if err != nil { return err } for _, channel := range nodeChans.Channels { if channel.ChannelPoint != chanPoint.String() { continue } if len(channel.PendingHtlcs) != numHtlcs { return fmt.Errorf("expected %v active HTLCs, got %v", numHtlcs, len(channel.PendingHtlcs)) } return nil } return fmt.Errorf("channel point %v not found", chanPoint) } func assertNumActiveHtlcs(nodes []*lntest.HarnessNode, numHtlcs int) error { ctxb := context.Background() req := &lnrpc.ListChannelsRequest{} for _, node := range nodes { ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) nodeChans, err := node.ListChannels(ctxt, req) if err != nil { return err } for _, channel := range nodeChans.Channels { if len(channel.PendingHtlcs) != numHtlcs { return fmt.Errorf("expected %v HTLCs, got %v", numHtlcs, len(channel.PendingHtlcs)) } } } return nil } func assertSpendingTxInMempool(t *harnessTest, miner *rpcclient.Client, timeout time.Duration, chanPoint wire.OutPoint) { breakTimeout := time.After(timeout) ticker := time.NewTicker(50 * time.Millisecond) defer ticker.Stop() for { select { case <-breakTimeout: t.Fatalf("didn't find tx in mempool") case <-ticker.C: mempool, err := miner.GetRawMempool() if err != nil { t.Fatalf("unable to get mempool: %v", err) } if len(mempool) == 0 { continue } for _, txid := range mempool { tx, err := miner.GetRawTransaction(txid) if err != nil { t.Fatalf("unable to fetch tx: %v", err) } for _, txIn := range tx.MsgTx().TxIn { if txIn.PreviousOutPoint == chanPoint { return } } } } } } func createThreeHopHodlNetwork(t *harnessTest, net *lntest.NetworkHarness) (*lnrpc.ChannelPoint, *lnrpc.ChannelPoint, *lntest.HarnessNode) { ctxb := context.Background() // We'll start the test by creating a channel between Alice and Bob, // which will act as the first leg for out multi-hop HTLC. const chanAmt = 1000000 ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) aliceChanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, aliceChanPoint) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, aliceChanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } // Next, we'll create a new node "carol" and have Bob connect to her. // In this test, we'll make carol always hold onto the HTLC, this way // it'll force Bob to go to chain to resolve the HTLC. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new node: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, carol); err != nil { t.Fatalf("unable to connect bob to carol: %v", err) } // We'll then create a channel from Bob to Carol. After this channel is // open, our topology looks like: A -> B -> C. ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) bobChanPoint := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Bob.WaitForNetworkChannelOpen(ctxt, bobChanPoint) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, bobChanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.Alice.WaitForNetworkChannelOpen(ctxt, bobChanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } return aliceChanPoint, bobChanPoint, carol } // testMultiHopHtlcLocalTimeout tests that in a multi-hop HTLC scenario, if the // outgoing HTLC is about to time out, then we'll go to chain in order to claim // it. Any dust HTLC's should be immediately cancelled backwards. Once the // timeout has been reached, then we should sweep it on-chain, and cancel the // HTLC backwards. func testMultiHopHtlcLocalTimeout(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) time.Sleep(time.Second * 1) // Now that our channels are set up, we'll send two HTLC's from Alice // to Carol. The first HTLC will be universally considered "dust", // while the second will be a proper fully valued HTLC. const ( dustHtlcAmt = btcutil.Amount(100) htlcAmt = btcutil.Amount(30000) finalCltvDelta = 40 ) ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } // We'll create two random payment hashes unknown to carol, then send // each of them by manually specifying the HTLC details. carolPubKey := carol.PubKey[:] dustPayHash := makeFakePayHash(t) payHash := makeFakePayHash(t) err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(dustHtlcAmt), PaymentHash: dustPayHash, FinalCltvDelta: finalCltvDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(htlcAmt), PaymentHash: payHash, FinalCltvDelta: finalCltvDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } // Verify that all nodes in the path now have two HTLC's with the // proper parameters. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, dustPayHash, payHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // We'll now mine enough blocks to trigger Bob's broadcast of his // commitment transaction due to the fact that the HTLC is about to // timeout. numBlocks := uint32(finalCltvDelta - defaultBroadcastDelta) if _, err := net.Miner.Node.Generate(numBlocks); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Bob's force close transaction should now be found in the mempool. txidHash, err := getChanPointFundingTxid(bobChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobFundingTxid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } assertSpendingTxInMempool( t, net.Miner.Node, minerMempoolTimeout, wire.OutPoint{ Hash: *bobFundingTxid, Index: bobChanPoint.OutputIndex, }, ) // Mine a block to confirm the closing transaction. mineBlocks(t, net, 1, 1) // At this point, Bob should have cancelled backwards the dust HTLC // that we sent earlier. This means Alice should now only have a single // HTLC on her channel. nodes = []*lntest.HarnessNode{net.Alice} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, payHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // We'll mine defaultCSV blocks in order to generate the sweep transaction // of Bob's funding output. if _, err := net.Miner.Node.Generate(defaultCSV); err != nil { t.Fatalf("unable to generate blocks: %v", err) } _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's funding output sweep tx: %v", err) } // We'll now mine the remaining blocks to cause the HTLC itself to // timeout. if _, err := net.Miner.Node.Generate(defaultBroadcastDelta - defaultCSV); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // The second layer HTLC timeout transaction should now have been // broadcast on-chain. secondLayerHash, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's second layer transaction") } // Bob's pending channel report should show that he has a commitment // output awaiting sweeping, and also that there's an outgoing HTLC // output pending. pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels(ctxt, pendingChansRequest) if err != nil { t.Fatalf("unable to query for pending channels: %v", err) } if len(pendingChanResp.PendingForceClosingChannels) == 0 { t.Fatalf("bob should have pending for close chan but doesn't") } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if forceCloseChan.LimboBalance == 0 { t.Fatalf("bob should have nonzero limbo balance instead "+ "has: %v", forceCloseChan.LimboBalance) } if len(forceCloseChan.PendingHtlcs) == 0 { t.Fatalf("bob should have pending htlc but doesn't") } // Now we'll mine an additional block, which should include the second // layer sweep tx. block := mineBlocks(t, net, 1, 1)[0] // The block should have confirmed Bob's second layer sweeping // transaction. Therefore, at this point, there should be no active // HTLC's on the commitment transaction from Alice -> Bob. assertTxInBlock(t, block, secondLayerHash) nodes = []*lntest.HarnessNode{net.Alice} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("alice's channel still has active htlc's: %v", predErr) } // At this point, Bob should show that the pending HTLC has advanced to // the second stage and is to be swept. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err = net.Bob.PendingChannels(ctxt, pendingChansRequest) if err != nil { t.Fatalf("unable to query for pending channels: %v", err) } forceCloseChan = pendingChanResp.PendingForceClosingChannels[0] if forceCloseChan.PendingHtlcs[0].Stage != 2 { t.Fatalf("bob's htlc should have advanced to the second stage: %v", err) } // We'll now mine four more blocks. After the 4th block, a transaction // sweeping the HTLC output should be broadcast. if _, err := net.Miner.Node.Generate(4); err != nil { t.Fatalf("unable to generate blocks: %v", err) } _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's sweeping transaction: %v", err) } // Next, we'll mine a final block that should confirm the second-layer // sweeping transaction. if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Once this transaction has been confirmed, Bob should detect that he // no longer has any pending channels. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err = net.Bob.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob still has pending "+ "channels but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, aliceChanPoint, false) } // testMultiHopReceiverChainClaim tests that in the multi-hop setting, if the // receiver of an HTLC knows the preimage, but wasn't able to settle the HTLC // off-chain, then it goes on chain to claim the HTLC. In this scenario, the // node that sent the outgoing HTLC should extract the preimage from the sweep // transaction, and finish settling the HTLC backwards into the route. func testMultiHopReceiverChainClaim(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) // With the network active, we'll now add a new invoice at Carol's end. const invoiceAmt = 100000 invoiceReq := &lnrpc.Invoice{ Value: invoiceAmt, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } // Now that we've created the invoice, we'll send a single payment from // Alice to Carol. We won't wait for the response however, as Carol // will not immediately settle the payment. ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } err = alicePayStream.Send(&lnrpc.SendRequest{ PaymentRequest: carolInvoice.PaymentRequest, }) if err != nil { t.Fatalf("unable to send payment: %v", err) } // At this point, all 3 nodes should now have an active channel with // the created HTLC pending on all of them. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, carolInvoice.RHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Now we'll mine enough blocks to prompt carol to actually go to the // chain in order to sweep her HTLC since the value is high enough. // TODO(roasbeef): modify once go to chain policy changes numBlocks := uint32(defaultBitcoinTimeLockDelta - (2 * defaultBroadcastDelta)) if _, err := net.Miner.Node.Generate(numBlocks); err != nil { t.Fatalf("unable to generate blocks") } // At this point, Carol should broadcast her active commitment // transaction in order to go to the chain and sweep her HTLC. txids, err := waitForNTxsInMempool(net.Miner.Node, 1, minerMempoolTimeout) if err != nil { t.Fatalf("expected transaction not found in mempool: %v", err) } txidHash, err := getChanPointFundingTxid(bobChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobFundingTxid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundingPoint := wire.OutPoint{ Hash: *bobFundingTxid, Index: bobChanPoint.OutputIndex, } // The commitment transaction should be spending from the funding // transaction. commitHash := txids[0] tx, err := net.Miner.Node.GetRawTransaction(commitHash) if err != nil { t.Fatalf("unable to get txn: %v", err) } commitTx := tx.MsgTx() if commitTx.TxIn[0].PreviousOutPoint != carolFundingPoint { t.Fatalf("commit transaction not spending from expected "+ "outpoint: %v", spew.Sdump(commitTx)) } // Confirm the commitment. mineBlocks(t, net, 1, 1) // After the force close transaction is mined, Carol should broadcast // her second level HTLC transaction. Bob will broadcast a sweep tx to // sweep his output in the channel with Carol. When Bob notices Carol's // second level transaction in the mempool, he will extract the // preimage and settle the HTLC back off-chain. secondLevelHashes, err := waitForNTxsInMempool(net.Miner.Node, 2, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } // Carol's second level transaction should be spending from // the commitment transaction. var secondLevelHash *chainhash.Hash for _, txid := range secondLevelHashes { tx, err := net.Miner.Node.GetRawTransaction(txid) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash == *commitHash { secondLevelHash = txid } } if secondLevelHash == nil { t.Fatalf("Carol's second level tx not found") } // We'll now mine an additional block which should confirm both the // second layer transactions. if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to generate block: %v", err) } time.Sleep(time.Second * 4) // TODO(roasbeef): assert bob pending state as well // Carol's pending channel report should now show two outputs under // limbo: her commitment output, as well as the second-layer claim // output. pendingChansRequest := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := carol.PendingChannels(ctxt, pendingChansRequest) if err != nil { t.Fatalf("unable to query for pending channels: %v", err) } if len(pendingChanResp.PendingForceClosingChannels) == 0 { t.Fatalf("carol should have pending for close chan but doesn't") } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if forceCloseChan.LimboBalance == 0 { t.Fatalf("carol should have nonzero limbo balance instead "+ "has: %v", forceCloseChan.LimboBalance) } // The pending HTLC carol has should also now be in stage 2. if len(forceCloseChan.PendingHtlcs) != 1 { t.Fatalf("carol should have pending htlc but doesn't") } if forceCloseChan.PendingHtlcs[0].Stage != 2 { t.Fatalf("carol's htlc should have advanced to the second "+ "stage: %v", err) } // Once the second-level transaction confirmed, Bob should have // extracted the preimage from the chain, and sent it back to Alice, // clearing the HTLC off-chain. nodes = []*lntest.HarnessNode{net.Alice} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // If we mine 4 additional blocks, then both outputs should now be // mature. if _, err := net.Miner.Node.Generate(defaultCSV); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // We should have a new transaction in the mempool. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's sweeping transaction: %v", err) } // Finally, if we mine an additional block to confirm these two sweep // transactions, Carol should not show a pending channel in her report // afterwards. if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to mine block: %v", err) } err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err = carol.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("carol still has pending channels: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // The invoice should show as settled for Carol, indicating that it was // swept on-chain. invoicesReq := &lnrpc.ListInvoiceRequest{} invoicesResp, err := carol.ListInvoices(ctxb, invoicesReq) if err != nil { t.Fatalf("unable to retrieve invoices: %v", err) } if len(invoicesResp.Invoices) != 1 { t.Fatalf("expected 1 invoice, got %d", len(invoicesResp.Invoices)) } invoice := invoicesResp.Invoices[0] if invoice.State != lnrpc.Invoice_SETTLED { t.Fatalf("expected invoice to be settled on chain") } if invoice.AmtPaidSat != invoiceAmt { t.Fatalf("expected invoice to be settled with %d sat, got "+ "%d sat", invoiceAmt, invoice.AmtPaidSat) } // We'll close out the channel between Alice and Bob, then shutdown // carol to conclude the test. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, aliceChanPoint, false) } // testMultiHopLocalForceCloseOnChainHtlcTimeout tests that in a multi-hop HTLC // scenario, if the node that extended the HTLC to the final node closes their // commitment on-chain early, then it eventually recognizes this HTLC as one // that's timed out. At this point, the node should timeout the HTLC, then // cancel it backwards as normal. func testMultiHopLocalForceCloseOnChainHtlcTimeout(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) // With our channels set up, we'll then send a single HTLC from Alice // to Carol. As Carol is in hodl mode, she won't settle this HTLC which // opens up the base for out tests. const ( finalCltvDelta = 40 htlcAmt = btcutil.Amount(30000) ) ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } // We'll now send a single HTLC across our multi-hop network. carolPubKey := carol.PubKey[:] payHash := makeFakePayHash(t) err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(htlcAmt), PaymentHash: payHash, FinalCltvDelta: finalCltvDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } // Once the HTLC has cleared, all channels in our mini network should // have the it locked in. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, payHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", err) } // Now that all parties have the HTLC locked in, we'll immediately // force close the Bob -> Carol channel. This should trigger contract // resolution mode for both of them. ctxt, _ := context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, bobChanPoint, true) // At this point, Bob should have a pending force close channel as he // just went to chain. pendingChansRequest := &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels(ctxt, pendingChansRequest) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending for " + "close chan but doesn't") return false } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if forceCloseChan.LimboBalance == 0 { predErr = fmt.Errorf("bob should have nonzero limbo "+ "balance instead has: %v", forceCloseChan.LimboBalance) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // We'll mine defaultCSV blocks in order to generate the sweep transaction // of Bob's funding output. if _, err := net.Miner.Node.Generate(defaultCSV); err != nil { t.Fatalf("unable to generate blocks: %v", err) } _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's funding output sweep tx: %v", err) } // We'll now mine enough blocks for the HTLC to expire. After this, Bob // should hand off the now expired HTLC output to the utxo nursery. if _, err := net.Miner.Node.Generate(finalCltvDelta - defaultCSV - 1); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Bob's pending channel report should show that he has a single HTLC // that's now in stage one. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending force " + "close chan but doesn't") return false } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if len(forceCloseChan.PendingHtlcs) != 1 { predErr = fmt.Errorf("bob should have pending htlc " + "but doesn't") return false } if forceCloseChan.PendingHtlcs[0].Stage != 1 { predErr = fmt.Errorf("bob's htlc should have "+ "advanced to the first stage: %v", err) return false } return true }, time.Second*15) if err != nil { t.Fatalf("bob didn't hand off time-locked HTLC: %v", predErr) } // We should also now find a transaction in the mempool, as Bob should // have broadcast his second layer timeout transaction. timeoutTx, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's htlc timeout tx: %v", err) } // Next, we'll mine an additional block. This should serve to confirm // the second layer timeout transaction. block := mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, timeoutTx) // With the second layer timeout transaction confirmed, Bob should have // cancelled backwards the HTLC that carol sent. nodes = []*lntest.HarnessNode{net.Alice} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("alice's channel still has active htlc's: %v", predErr) } // Additionally, Bob should now show that HTLC as being advanced to the // second stage. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending for " + "close chan but doesn't") return false } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if len(forceCloseChan.PendingHtlcs) != 1 { predErr = fmt.Errorf("bob should have pending htlc " + "but doesn't") return false } if forceCloseChan.PendingHtlcs[0].Stage != 2 { predErr = fmt.Errorf("bob's htlc should have "+ "advanced to the second stage: %v", err) return false } return true }, time.Second*15) if err != nil { t.Fatalf("bob didn't hand off time-locked HTLC: %v", predErr) } // We'll now mine 4 additional blocks. This should be enough for Bob's // CSV timelock to expire and the sweeping transaction of the HTLC to be // broadcast. if _, err := net.Miner.Node.Generate(defaultCSV); err != nil { t.Fatalf("unable to mine blocks: %v", err) } sweepTx, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's htlc sweep tx: %v", err) } // We'll then mine a final block which should confirm this second layer // sweep transaction. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, sweepTx) // At this point, Bob should no longer show any channels as pending // close. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob still has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, aliceChanPoint, false) } // testMultiHopRemoteForceCloseOnChainHtlcTimeout tests that if we extend a // multi-hop HTLC, and the final destination of the HTLC force closes the // channel, then we properly timeout the HTLC on *their* commitment transaction // once the timeout has expired. Once we sweep the transaction, we should also // cancel back the initial HTLC. func testMultiHopRemoteForceCloseOnChainHtlcTimeout(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) // With our channels set up, we'll then send a single HTLC from Alice // to Carol. As Carol is in hodl mode, she won't settle this HTLC which // opens up the base for out tests. const ( finalCltvDelta = 40 htlcAmt = btcutil.Amount(30000) ) ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } // We'll now send a single HTLC across our multi-hop network. carolPubKey := carol.PubKey[:] payHash := makeFakePayHash(t) err = alicePayStream.Send(&lnrpc.SendRequest{ Dest: carolPubKey, Amt: int64(htlcAmt), PaymentHash: payHash, FinalCltvDelta: finalCltvDelta, }) if err != nil { t.Fatalf("unable to send alice htlc: %v", err) } // Once the HTLC has cleared, all the nodes in our mini network should // show that the HTLC has been locked in. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, payHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // At this point, we'll now instruct Carol to force close the // transaction. This will let us exercise that Bob is able to sweep the // expired HTLC on Carol's version of the commitment transaction. ctxt, _ := context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, bobChanPoint, true) // At this point, Bob should have a pending force close channel as // Carol has gone directly to chain. pendingChansRequest := &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for "+ "pending channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending " + "force close channels but doesn't") return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // Bob can sweep his output immediately. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's funding output sweep tx: %v", err) } // Next, we'll mine enough blocks for the HTLC to expire. At this // point, Bob should hand off the output to his internal utxo nursery, // which will broadcast a sweep transaction. if _, err := net.Miner.Node.Generate(finalCltvDelta - 1); err != nil { t.Fatalf("unable to generate blocks: %v", err) } // If we check Bob's pending channel report, it should show that he has // a single HTLC that's now in the second stage, as skip the initial // first stage since this is a direct HTLC. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending for " + "close chan but doesn't") return false } forceCloseChan := pendingChanResp.PendingForceClosingChannels[0] if len(forceCloseChan.PendingHtlcs) != 1 { predErr = fmt.Errorf("bob should have pending htlc " + "but doesn't") return false } if forceCloseChan.PendingHtlcs[0].Stage != 2 { predErr = fmt.Errorf("bob's htlc should have "+ "advanced to the second stage: %v", err) return false } return true }, time.Second*15) if err != nil { t.Fatalf("bob didn't hand off time-locked HTLC: %v", predErr) } // Bob's sweeping transaction should now be found in the mempool at // this point. sweepTx, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { // If Bob's transaction isn't yet in the mempool, then due to // internal message passing and the low period between blocks // being mined, it may have been detected as a late // registration. As a result, we'll mine another block and // repeat the check. If it doesn't go through this time, then // we'll fail. // TODO(halseth): can we use waitForChannelPendingForceClose to // avoid this hack? if _, err := net.Miner.Node.Generate(1); err != nil { t.Fatalf("unable to generate block: %v", err) } sweepTx, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's sweeping transaction: "+ "%v", err) } } // If we mine an additional block, then this should confirm Bob's // transaction which sweeps the direct HTLC output. block := mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, sweepTx) // Now that the sweeping transaction has been confirmed, Bob should // cancel back that HTLC. As a result, Alice should not know of any // active HTLC's. nodes = []*lntest.HarnessNode{net.Alice} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("alice's channel still has active htlc's: %v", predErr) } // Now we'll check Bob's pending channel report. Since this was Carol's // commitment, he doesn't have to wait for any CSV delays. As a result, // he should show no additional pending transactions. err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob still has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // We'll close out the test by closing the channel from Alice to Bob, // and then shutting down the new node we created as its no longer // needed. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, aliceChanPoint, false) } // testMultiHopHtlcLocalChainClaim tests that in a multi-hop HTLC scenario, if // we're forced to go to chain with an incoming HTLC, then when we find out the // preimage via the witness beacon, we properly settle the HTLC on-chain in // order to ensure we don't lose any funds. func testMultiHopHtlcLocalChainClaim(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) // With the network active, we'll now add a new invoice at Carol's end. invoiceReq := &lnrpc.Invoice{ Value: 100000, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } // Now that we've created the invoice, we'll send a single payment from // Alice to Carol. We won't wait for the response however, as Carol // will not immediately settle the payment. ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } err = alicePayStream.Send(&lnrpc.SendRequest{ PaymentRequest: carolInvoice.PaymentRequest, }) if err != nil { t.Fatalf("unable to send payment: %v", err) } // We'll now wait until all 3 nodes have the HTLC as just sent fully // locked in. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, carolInvoice.RHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", err) } // At this point, Bob decides that he wants to exit the channel // immediately, so he force closes his commitment transaction. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) bobForceClose := closeChannelAndAssert(ctxt, t, net, net.Bob, aliceChanPoint, true) // Alice will sweep her output immediately. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find alice's sweep tx in miner mempool: %v", err) } // We'll now mine enough blocks so Carol decides that she needs to go // on-chain to claim the HTLC as Bob has been inactive. numBlocks := uint32(defaultBitcoinTimeLockDelta - (2 * defaultBroadcastDelta)) if _, err := net.Miner.Node.Generate(numBlocks); err != nil { t.Fatalf("unable to generate blocks") } // Carol's commitment transaction should now be in the mempool. txids, err := waitForNTxsInMempool(net.Miner.Node, 1, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } txidHash, err := getChanPointFundingTxid(bobChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobFundingTxid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundingPoint := wire.OutPoint{ Hash: *bobFundingTxid, Index: bobChanPoint.OutputIndex, } // The tx should be spending from the funding transaction, commitHash := txids[0] tx1, err := net.Miner.Node.GetRawTransaction(commitHash) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx1.MsgTx().TxIn[0].PreviousOutPoint != carolFundingPoint { t.Fatalf("commit transaction not spending fundingtx: %v", spew.Sdump(tx1)) } // Mine a block that should confirm the commit tx. block := mineBlocks(t, net, 1, 1)[0] if len(block.Transactions) != 2 { t.Fatalf("expected 2 transactions in block, got %v", len(block.Transactions)) } assertTxInBlock(t, block, commitHash) // After the force close transacion is mined, Carol should broadcast // her second level HTLC transacion. Bob will broadcast a sweep tx to // sweep his output in the channel with Carol. He can do this // immediately, as the output is not timelocked since Carol was the one // force closing. commitSpends, err := waitForNTxsInMempool(net.Miner.Node, 2, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } // Both Carol's second level transaction and Bob's sweep should be // spending from the commitment transaction. for _, txid := range commitSpends { tx, err := net.Miner.Node.GetRawTransaction(txid) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash != *commitHash { t.Fatalf("tx did not spend from commitment tx") } } // Mine a block to confirm the two transactions (+ the coinbase). block = mineBlocks(t, net, 1, 2)[0] if len(block.Transactions) != 3 { t.Fatalf("expected 3 transactions in block, got %v", len(block.Transactions)) } for _, txid := range commitSpends { assertTxInBlock(t, block, txid) } // Keep track of the second level tx maturity. carolSecondLevelCSV := uint32(defaultCSV) // When Bob notices Carol's second level transaction in the block, he // will extract the preimage and broadcast a second level tx to claim // the HTLC in his (already closed) channel with Alice. bobSecondLvlTx, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } // It should spend from the commitment in the channel with Alice. tx, err := net.Miner.Node.GetRawTransaction(bobSecondLvlTx) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash != *bobForceClose { t.Fatalf("tx did not spend from bob's force close tx") } // At this point, Bob should have broadcast his second layer success // transaction, and should have sent it to the nursery for incubation. pendingChansRequest := &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) == 0 { predErr = fmt.Errorf("bob should have pending for " + "close chan but doesn't") return false } for _, forceCloseChan := range pendingChanResp.PendingForceClosingChannels { if forceCloseChan.Channel.LocalBalance != 0 { continue } if len(forceCloseChan.PendingHtlcs) != 1 { predErr = fmt.Errorf("bob should have pending htlc " + "but doesn't") return false } stage := forceCloseChan.PendingHtlcs[0].Stage if stage != 1 { predErr = fmt.Errorf("bob's htlc should have "+ "advanced to the first stage but was "+ "stage: %v", stage) return false } } return true }, time.Second*15) if err != nil { t.Fatalf("bob didn't hand off time-locked HTLC: %v", predErr) } // We'll now mine a block which should confirm Bob's second layer // transaction. block = mineBlocks(t, net, 1, 1)[0] if len(block.Transactions) != 2 { t.Fatalf("expected 2 transactions in block, got %v", len(block.Transactions)) } assertTxInBlock(t, block, bobSecondLvlTx) // Keep track of Bob's second level maturity, and decrement our track // of Carol's. bobSecondLevelCSV := uint32(defaultCSV) carolSecondLevelCSV-- // If we then mine 3 additional blocks, Carol's second level tx should // mature, and she can pull the funds from it with a sweep tx. if _, err := net.Miner.Node.Generate(carolSecondLevelCSV); err != nil { t.Fatalf("unable to generate block: %v", err) } bobSecondLevelCSV -= carolSecondLevelCSV carolSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's sweeping transaction: %v", err) } // Mining one additional block, Bob's second level tx is mature, and he // can sweep the output. block = mineBlocks(t, net, bobSecondLevelCSV, 1)[0] assertTxInBlock(t, block, carolSweep) bobSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find bob's sweeping transaction") } // Make sure it spends from the second level tx. tx, err = net.Miner.Node.GetRawTransaction(bobSweep) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash != *bobSecondLvlTx { t.Fatalf("tx did not spend from bob's second level tx") } // When we mine one additional block, that will confirm Bob's sweep. // Now Bob should have no pending channels anymore, as this just // resolved it by the confirmation of the sweep transaction. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, bobSweep) err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob still has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } req := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanInfo, err := net.Bob.ListChannels(ctxt, req) if err != nil { predErr = fmt.Errorf("unable to query for open "+ "channels: %v", err) return false } if len(chanInfo.Channels) != 0 { predErr = fmt.Errorf("Bob should have no open "+ "channels, instead he has %v", len(chanInfo.Channels)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // Also Carol should have no channels left (open nor pending). err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := carol.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob carol has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } req := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) chanInfo, err := carol.ListChannels(ctxt, req) if err != nil { predErr = fmt.Errorf("unable to query for open "+ "channels: %v", err) return false } if len(chanInfo.Channels) != 0 { predErr = fmt.Errorf("carol should have no open "+ "channels, instead she has %v", len(chanInfo.Channels)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } } // testMultiHopHtlcRemoteChainClaim tests that in the multi-hop HTLC scenario, // if the remote party goes to chain while we have an incoming HTLC, then when // we found out the preimage via the witness beacon, we properly settle the // HTLC on-chain in order to ensure that we don't lose any funds. func testMultiHopHtlcRemoteChainClaim(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll create a three hop network: Alice -> Bob -> Carol, with // Carol refusing to actually settle or directly cancel any HTLC's // self. aliceChanPoint, bobChanPoint, carol := createThreeHopHodlNetwork(t, net) // Clean up carol's node when the test finishes. defer shutdownAndAssert(net, t, carol) // With the network active, we'll now add a new invoice at Carol's end. const invoiceAmt = 100000 invoiceReq := &lnrpc.Invoice{ Value: invoiceAmt, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq) if err != nil { t.Fatalf("unable to generate carol invoice: %v", err) } // Now that we've created the invoice, we'll send a single payment from // Alice to Carol. We won't wait for the response however, as Carol // will not immediately settle the payment. ctx, cancel := context.WithCancel(ctxb) defer cancel() alicePayStream, err := net.Alice.SendPayment(ctx) if err != nil { t.Fatalf("unable to create payment stream for alice: %v", err) } err = alicePayStream.Send(&lnrpc.SendRequest{ PaymentRequest: carolInvoice.PaymentRequest, }) if err != nil { t.Fatalf("unable to send payment: %v", err) } // We'll now wait until all 3 nodes have the HTLC as just sent fully // locked in. var predErr error nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol} err = lntest.WaitPredicate(func() bool { predErr = assertActiveHtlcs(nodes, carolInvoice.RHash) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", err) } // Next, Alice decides that she wants to exit the channel, so she'll // immediately force close the channel by broadcast her commitment // transaction. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) aliceForceClose := closeChannelAndAssert(ctxt, t, net, net.Alice, aliceChanPoint, true) // Wait for the channel to be marked pending force close. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = waitForChannelPendingForceClose(ctxt, net.Alice, aliceChanPoint) if err != nil { t.Fatalf("channel not pending force close: %v", err) } // Mine enough blocks for Alice to sweep her funds from the force // closed channel. _, err = net.Miner.Node.Generate(defaultCSV) if err != nil { t.Fatalf("unable to generate blocks: %v", err) } // Alice should now sweep her funds. _, err = waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find sweeping tx in mempool: %v", err) } // We'll now mine enough blocks so Carol decides that she needs to go // on-chain to claim the HTLC as Bob has been inactive. claimDelta := uint32(2 * defaultBroadcastDelta) numBlocks := uint32(defaultBitcoinTimeLockDelta-claimDelta) - defaultCSV if _, err := net.Miner.Node.Generate(numBlocks); err != nil { t.Fatalf("unable to generate blocks") } // Carol's commitment transaction should now be in the mempool. txids, err := waitForNTxsInMempool(net.Miner.Node, 1, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } txidHash, err := getChanPointFundingTxid(bobChanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } bobFundingTxid, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundingPoint := wire.OutPoint{ Hash: *bobFundingTxid, Index: bobChanPoint.OutputIndex, } // The transaction should be spending from the funding transaction commitHash := txids[0] tx1, err := net.Miner.Node.GetRawTransaction(commitHash) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx1.MsgTx().TxIn[0].PreviousOutPoint != carolFundingPoint { t.Fatalf("commit transaction not spending fundingtx: %v", spew.Sdump(tx1)) } // Mine a block, which should contain the commitment. block := mineBlocks(t, net, 1, 1)[0] if len(block.Transactions) != 2 { t.Fatalf("expected 2 transactions in block, got %v", len(block.Transactions)) } assertTxInBlock(t, block, commitHash) // After the force close transacion is mined, Carol should broadcast // her second level HTLC transacion. Bob will broadcast a sweep tx to // sweep his output in the channel with Carol. He can do this // immediately, as the output is not timelocked since Carol was the one // force closing. commitSpends, err := waitForNTxsInMempool(net.Miner.Node, 2, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } // Both Carol's second level transaction and Bob's sweep should be // spending from the commitment transaction. for _, txid := range commitSpends { tx, err := net.Miner.Node.GetRawTransaction(txid) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash != *commitHash { t.Fatalf("tx did not spend from commitment tx") } } // Mine a block to confirm the two transactions (+ coinbase). block = mineBlocks(t, net, 1, 2)[0] if len(block.Transactions) != 3 { t.Fatalf("expected 3 transactions in block, got %v", len(block.Transactions)) } for _, txid := range commitSpends { assertTxInBlock(t, block, txid) } // Keep track of the second level tx maturity. carolSecondLevelCSV := uint32(defaultCSV) // When Bob notices Carol's second level transaction in the block, he // will extract the preimage and broadcast a sweep tx to directly claim // the HTLC in his (already closed) channel with Alice. bobHtlcSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("transactions not found in mempool: %v", err) } // It should spend from the commitment in the channel with Alice. tx, err := net.Miner.Node.GetRawTransaction(bobHtlcSweep) if err != nil { t.Fatalf("unable to get txn: %v", err) } if tx.MsgTx().TxIn[0].PreviousOutPoint.Hash != *aliceForceClose { t.Fatalf("tx did not spend from alice's force close tx") } // We'll now mine a block which should confirm Bob's HTLC sweep // transaction. block = mineBlocks(t, net, 1, 1)[0] if len(block.Transactions) != 2 { t.Fatalf("expected 2 transactions in block, got %v", len(block.Transactions)) } assertTxInBlock(t, block, bobHtlcSweep) carolSecondLevelCSV-- // Now that the sweeping transaction has been confirmed, Bob should now // recognize that all contracts have been fully resolved, and show no // pending close channels. pendingChansRequest := &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := net.Bob.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("bob still has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // If we then mine 3 additional blocks, Carol's second level tx will // mature, and she should pull the funds. if _, err := net.Miner.Node.Generate(carolSecondLevelCSV); err != nil { t.Fatalf("unable to generate block: %v", err) } carolSweep, err := waitForTxInMempool(net.Miner.Node, minerMempoolTimeout) if err != nil { t.Fatalf("unable to find Carol's sweeping transaction: %v", err) } // When Carol's sweep gets confirmed, she should have no more pending // channels. block = mineBlocks(t, net, 1, 1)[0] assertTxInBlock(t, block, carolSweep) pendingChansRequest = &lnrpc.PendingChannelsRequest{} err = lntest.WaitPredicate(func() bool { ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) pendingChanResp, err := carol.PendingChannels( ctxt, pendingChansRequest, ) if err != nil { predErr = fmt.Errorf("unable to query for pending "+ "channels: %v", err) return false } if len(pendingChanResp.PendingForceClosingChannels) != 0 { predErr = fmt.Errorf("carol still has pending channels "+ "but shouldn't: %v", spew.Sdump(pendingChanResp)) return false } return true }, time.Second*15) if err != nil { t.Fatalf(predErr.Error()) } // The invoice should show as settled for Carol, indicating that it was // swept on-chain. invoicesReq := &lnrpc.ListInvoiceRequest{} invoicesResp, err := carol.ListInvoices(ctxb, invoicesReq) if err != nil { t.Fatalf("unable to retrieve invoices: %v", err) } if len(invoicesResp.Invoices) != 1 { t.Fatalf("expected 1 invoice, got %d", len(invoicesResp.Invoices)) } invoice := invoicesResp.Invoices[0] if invoice.State != lnrpc.Invoice_SETTLED { t.Fatalf("expected invoice to be settled on chain") } if invoice.AmtPaidSat != invoiceAmt { t.Fatalf("expected invoice to be settled with %d sat, got "+ "%d sat", invoiceAmt, invoice.AmtPaidSat) } } // testSwitchCircuitPersistence creates a multihop network to ensure the sender // and intermediaries are persisting their open payment circuits. After // forwarding a packet via an outgoing link, all are restarted, and expected to // forward a response back from the receiver once back online. // // The general flow of this test: // 1. Carol --> Dave --> Alice --> Bob forward payment // 2. X X X Bob restart sender and intermediaries // 3. Carol <-- Dave <-- Alice <-- Bob expect settle to propagate func testSwitchCircuitPersistence(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(1000000) const pushAmt = btcutil.Amount(900000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // As preliminary setup, we'll create two new nodes: Carol and Dave, // such that we now have a 4 ndoe, 3 channel topology. Dave will make // a channel with Alice, and Carol with Dave. After this setup, the // network topology should now look like: // Carol -> Dave -> Alice -> Bob // // First, we'll create Dave and establish a channel to Alice. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel to from her to // Dave. Carol is started in htlchodl mode so that we can disconnect the // intermediary hops before starting the settle. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Create 5 invoices for Carol, which expect a payment from Bob for 1k // satoshis with a different preimage each time. const numPayments = 5 const paymentAmt = 1000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointDave) if err != nil { t.Fatalf("dave didn't advertise his channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel in time: %v", err) } time.Sleep(time.Millisecond * 50) // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Wait until all nodes in the network have 5 outstanding htlcs. var predErr error err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Restart the intermediaries and the sender. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } if err := net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } if err := net.RestartNode(net.Bob, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Ensure all of the intermediate links are reconnected. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, net.Alice, dave) if err != nil { t.Fatalf("unable to reconnect alice and dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, net.Bob, net.Alice) if err != nil { t.Fatalf("unable to reconnect bob and alice: %v", err) } // Ensure all nodes in the network still have 5 outstanding htlcs. err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Now restart carol without hodl mode, to settle back the outstanding // payments. carol.SetExtraArgs(nil) if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, dave, carol) if err != nil { t.Fatalf("unable to reconnect dave and carol: %v", err) } // After the payments settle, there should be no active htlcs on any of // the nodes in the network. err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Carol, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Bob->Alice->David->Carol, order is Carol, // David, Alice, Bob. var amountPaid = int64(5000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*numPayments)) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*numPayments), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*numPayments)*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*numPayments)*2, int64(0)) // Lastly, we will send one more payment to ensure all channels are // still functioning properly. finalInvoice := &lnrpc.Invoice{ Memo: "testing", Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := carol.AddInvoice(ctxt, finalInvoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } payReqs = []string{resp.PaymentRequest} // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } amountPaid = int64(6000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*(numPayments+1))) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*(numPayments+1)), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*(numPayments+1))*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*(numPayments+1))*2, int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testSwitchOfflineDelivery constructs a set of multihop payments, and tests // that the returning payments are not lost if a peer on the backwards path is // offline when the settle/fails are received. We expect the payments to be // buffered in memory, and transmitted as soon as the disconnect link comes back // online. // // The general flow of this test: // 1. Carol --> Dave --> Alice --> Bob forward payment // 2. Carol --- Dave X Alice --- Bob disconnect intermediaries // 3. Carol --- Dave X Alice <-- Bob settle last hop // 4. Carol <-- Dave <-- Alice --- Bob reconnect, expect settle to propagate func testSwitchOfflineDelivery(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(1000000) const pushAmt = btcutil.Amount(900000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // As preliminary setup, we'll create two new nodes: Carol and Dave, // such that we now have a 4 ndoe, 3 channel topology. Dave will make // a channel with Alice, and Carol with Dave. After this setup, the // network topology should now look like: // Carol -> Dave -> Alice -> Bob // // First, we'll create Dave and establish a channel to Alice. dave, err := net.NewNode("Dave", []string{"--unsafe-disconnect"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel to from her to // Dave. Carol is started in htlchodl mode so that we can disconnect the // intermediary hops before starting the settle. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Create 5 invoices for Carol, which expect a payment from Bob for 1k // satoshis with a different preimage each time. const numPayments = 5 const paymentAmt = 1000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointDave) if err != nil { t.Fatalf("dave didn't advertise his channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel in time: %v", err) } time.Sleep(time.Millisecond * 50) // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Wait for all of the payments to reach Carol. var predErr error err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // First, disconnect Dave and Alice so that their link is broken. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.DisconnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to disconnect alice from dave: %v", err) } // Then, reconnect them to ensure Dave doesn't just fail back the htlc. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to reconnect alice to dave: %v", err) } // Wait to ensure that the payment remain are not failed back after // reconnecting. All node should report the number payments initiated // for the duration of the interval. err = lntest.WaitInvariant(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*2) if err != nil { t.Fatalf("htlc change: %v", predErr) } // Now, disconnect Dave from Alice again before settling back the // payment. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.DisconnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to disconnect alice from dave: %v", err) } // Now restart carol without hodl mode, to settle back the outstanding // payments. carol.SetExtraArgs(nil) if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Wait for Carol to report no outstanding htlcs. carolNode := []*lntest.HarnessNode{carol} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(carolNode, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Now that the settles have reached Dave, reconnect him with Alice, // allowing the settles to return to the sender. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.EnsureConnected(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to reconnect alice to dave: %v", err) } // Wait until all outstanding htlcs in the network have been settled. err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Carol, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Bob->Alice->David->Carol, order is Carol, // David, Alice, Bob. var amountPaid = int64(5000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*numPayments)) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*numPayments), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*numPayments)*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*numPayments)*2, int64(0)) // Lastly, we will send one more payment to ensure all channels are // still functioning properly. finalInvoice := &lnrpc.Invoice{ Memo: "testing", Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := carol.AddInvoice(ctxt, finalInvoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } payReqs = []string{resp.PaymentRequest} // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } amountPaid = int64(6000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*(numPayments+1))) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*(numPayments+1)), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*(numPayments+1))*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*(numPayments+1))*2, int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testSwitchOfflineDeliveryPersistence constructs a set of multihop payments, // and tests that the returning payments are not lost if a peer on the backwards // path is offline when the settle/fails are received AND the peer buffering the // responses is completely restarts. We expect the payments to be reloaded from // disk, and transmitted as soon as the intermediaries are reconnected. // // The general flow of this test: // 1. Carol --> Dave --> Alice --> Bob forward payment // 2. Carol --- Dave X Alice --- Bob disconnect intermediaries // 3. Carol --- Dave X Alice <-- Bob settle last hop // 4. Carol --- Dave X X Bob restart Alice // 5. Carol <-- Dave <-- Alice --- Bob expect settle to propagate func testSwitchOfflineDeliveryPersistence(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(1000000) const pushAmt = btcutil.Amount(900000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // As preliminary setup, we'll create two new nodes: Carol and Dave, // such that we now have a 4 ndoe, 3 channel topology. Dave will make // a channel with Alice, and Carol with Dave. After this setup, the // network topology should now look like: // Carol -> Dave -> Alice -> Bob // // First, we'll create Dave and establish a channel to Alice. dave, err := net.NewNode("Dave", []string{"--unsafe-disconnect"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel to from her to // Dave. Carol is started in htlchodl mode so that we can disconnect the // intermediary hops before starting the settle. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Create 5 invoices for Carol, which expect a payment from Bob for 1k // satoshis with a different preimage each time. const numPayments = 5 const paymentAmt = 1000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointDave) if err != nil { t.Fatalf("dave didn't advertise his channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel in time: %v", err) } // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } var predErr error err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Disconnect the two intermediaries, Alice and Dave, by shutting down // Alice. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.StopNode(net.Alice); err != nil { t.Fatalf("unable to shutdown alice: %v", err) } // Now restart carol without hodl mode, to settle back the outstanding // payments. carol.SetExtraArgs(nil) if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Make Carol and Dave are reconnected before waiting for the htlcs to // clear. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, dave, carol) if err != nil { t.Fatalf("unable to reconnect dave and carol: %v", err) } // Wait for Carol to report no outstanding htlcs, and also for Dav to // receive all the settles from Carol. carolNode := []*lntest.HarnessNode{carol} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(carolNode, 0) if predErr != nil { return false } predErr = assertNumActiveHtlcsChanPoint(dave, carolFundPoint, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Finally, restart dave who received the settles, but was unable to // deliver them to Alice since they were disconnected. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to restart dave: %v", err) } if err = net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("unable to restart alice: %v", err) } // Force Dave and Alice to reconnect before waiting for the htlcs to // clear. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, dave, net.Alice) if err != nil { t.Fatalf("unable to reconnect dave and carol: %v", err) } // After reconnection succeeds, the settles should be propagated all // the way back to the sender. All nodes should report no active htlcs. err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point all the channels within our proto network should be // shifted by 5k satoshis in the direction of Carol, the sink within the // payment flow generated above. The order of asserts corresponds to // increasing of time is needed to embed the HTLC in commitment // transaction, in channel Bob->Alice->David->Carol, order is Carol, // David, Alice, Bob. var amountPaid = int64(5000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*numPayments)) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*numPayments), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*numPayments)*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*numPayments)*2, int64(0)) // Lastly, we will send one more payment to ensure all channels are // still functioning properly. finalInvoice := &lnrpc.Invoice{ Memo: "testing", Value: paymentAmt, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) resp, err := carol.AddInvoice(ctxt, finalInvoice) if err != nil { t.Fatalf("unable to add invoice: %v", err) } payReqs = []string{resp.PaymentRequest} // Before completing the final payment request, ensure that the // connection between Dave and Carol has been healed. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, dave, carol) if err != nil { t.Fatalf("unable to reconnect dave and carol: %v", err) } // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, true) if err != nil { t.Fatalf("unable to send payments: %v", err) } amountPaid = int64(6000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*(numPayments+1))) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*(numPayments+1)), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*(numPayments+1))*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*(numPayments+1))*2, int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testSwitchOfflineDeliveryOutgoingOffline constructs a set of multihop payments, // and tests that the returning payments are not lost if a peer on the backwards // path is offline when the settle/fails are received AND the peer buffering the // responses is completely restarts. We expect the payments to be reloaded from // disk, and transmitted as soon as the intermediaries are reconnected. // // The general flow of this test: // 1. Carol --> Dave --> Alice --> Bob forward payment // 2. Carol --- Dave X Alice --- Bob disconnect intermediaries // 3. Carol --- Dave X Alice <-- Bob settle last hop // 4. Carol --- Dave X X shutdown Bob, restart Alice // 5. Carol <-- Dave <-- Alice X expect settle to propagate func testSwitchOfflineDeliveryOutgoingOffline( net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(1000000) const pushAmt = btcutil.Amount(900000) var networkChans []*lnrpc.ChannelPoint // Open a channel with 100k satoshis between Alice and Bob with Alice // being the sole funder of the channel. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointAlice) txidHash, err := getChanPointFundingTxid(chanPointAlice) if err != nil { t.Fatalf("unable to get txid: %v", err) } aliceChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } aliceFundPoint := wire.OutPoint{ Hash: *aliceChanTXID, Index: chanPointAlice.OutputIndex, } // As preliminary setup, we'll create two new nodes: Carol and Dave, // such that we now have a 4 ndoe, 3 channel topology. Dave will make // a channel with Alice, and Carol with Dave. After this setup, the // network topology should now look like: // Carol -> Dave -> Alice -> Bob // // First, we'll create Dave and establish a channel to Alice. dave, err := net.NewNode("Dave", []string{"--unsafe-disconnect"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Alice); err != nil { t.Fatalf("unable to connect dave to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, dave) if err != nil { t.Fatalf("unable to send coins to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointDave := openChannelAndAssert( ctxt, t, net, dave, net.Alice, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointDave) txidHash, err = getChanPointFundingTxid(chanPointDave) if err != nil { t.Fatalf("unable to get txid: %v", err) } daveChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } daveFundPoint := wire.OutPoint{ Hash: *daveChanTXID, Index: chanPointDave.OutputIndex, } // Next, we'll create Carol and establish a channel to from her to // Dave. Carol is started in htlchodl mode so that we can disconnect the // intermediary hops before starting the settle. carol, err := net.NewNode("Carol", []string{"--debughtlc", "--hodl.exit-settle"}) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, PushAmt: pushAmt, }, ) networkChans = append(networkChans, chanPointCarol) txidHash, err = getChanPointFundingTxid(chanPointCarol) if err != nil { t.Fatalf("unable to get txid: %v", err) } carolChanTXID, err := chainhash.NewHash(txidHash) if err != nil { t.Fatalf("unable to create sha hash: %v", err) } carolFundPoint := wire.OutPoint{ Hash: *carolChanTXID, Index: chanPointCarol.OutputIndex, } // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Create 5 invoices for Carol, which expect a payment from Bob for 1k // satoshis with a different preimage each time. const numPayments = 5 const paymentAmt = 1000 ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) payReqs, _, _, err := createPayReqs( ctxt, carol, paymentAmt, numPayments, ) if err != nil { t.Fatalf("unable to create pay reqs: %v", err) } // We'll wait for all parties to recognize the new channels within the // network. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = dave.WaitForNetworkChannelOpen(ctxt, chanPointDave) if err != nil { t.Fatalf("dave didn't advertise his channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = carol.WaitForNetworkChannelOpen(ctxt, chanPointCarol) if err != nil { t.Fatalf("carol didn't advertise her channel in time: %v", err) } // Using Carol as the source, pay to the 5 invoices from Bob created // above. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = completePaymentRequests(ctxt, net.Bob, payReqs, false) if err != nil { t.Fatalf("unable to send payments: %v", err) } // Wait for all payments to reach Carol. var predErr error err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodes, numPayments) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Disconnect the two intermediaries, Alice and Dave, so that when carol // restarts, the response will be held by Dave. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.StopNode(net.Alice); err != nil { t.Fatalf("unable to shutdown alice: %v", err) } // Now restart carol without hodl mode, to settle back the outstanding // payments. carol.SetExtraArgs(nil) if err := net.RestartNode(carol, nil); err != nil { t.Fatalf("Node restart failed: %v", err) } // Wait for Carol to report no outstanding htlcs. carolNode := []*lntest.HarnessNode{carol} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(carolNode, 0) if predErr != nil { return false } predErr = assertNumActiveHtlcsChanPoint(dave, carolFundPoint, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // Now check that the total amount was transferred from Dave to Carol. // The amount transferred should be exactly equal to the invoice total // payment amount, 5k satsohis. const amountPaid = int64(5000) assertAmountPaid(t, "Dave(local) => Carol(remote)", carol, carolFundPoint, int64(0), amountPaid) assertAmountPaid(t, "Dave(local) => Carol(remote)", dave, carolFundPoint, amountPaid, int64(0)) // Shutdown carol and leave her offline for the rest of the test. This // is critical, as we wish to see if Dave can propragate settles even if // the outgoing link is never revived. shutdownAndAssert(net, t, carol) // Now restart Dave, ensuring he is both persisting the settles, and is // able to reforward them to Alice after recovering from a restart. if err := net.RestartNode(dave, nil); err != nil { t.Fatalf("unable to restart dave: %v", err) } if err = net.RestartNode(net.Alice, nil); err != nil { t.Fatalf("unable to restart alice: %v", err) } // Ensure that Dave is reconnected to Alice before waiting for the htlcs // to clear. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.EnsureConnected(ctxt, dave, net.Alice) if err != nil { t.Fatalf("unable to reconnect alice and dave: %v", err) } // Since Carol has been shutdown permanently, we will wait until all // other nodes in the network report no active htlcs. nodesMinusCarol := []*lntest.HarnessNode{net.Bob, net.Alice, dave} err = lntest.WaitPredicate(func() bool { predErr = assertNumActiveHtlcs(nodesMinusCarol, 0) if predErr != nil { return false } return true }, time.Second*15) if err != nil { t.Fatalf("htlc mismatch: %v", predErr) } // When asserting the amount of satoshis moved, we'll factor in the // default base fee, as we didn't modify the fee structure when // creating the seed nodes in the network. const baseFee = 1 // At this point, all channels (minus Carol, who is shutdown) should // show a shift of 5k satoshis towards Carol. The order of asserts // corresponds to increasing of time is needed to embed the HTLC in // commitment transaction, in channel Bob->Alice->David, order is David, // Alice, Bob. assertAmountPaid(t, "Alice(local) => Dave(remote)", dave, daveFundPoint, int64(0), amountPaid+(baseFee*numPayments)) assertAmountPaid(t, "Alice(local) => Dave(remote)", net.Alice, daveFundPoint, amountPaid+(baseFee*numPayments), int64(0)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Alice, aliceFundPoint, int64(0), amountPaid+((baseFee*numPayments)*2)) assertAmountPaid(t, "Bob(local) => Alice(remote)", net.Bob, aliceFundPoint, amountPaid+(baseFee*numPayments)*2, int64(0)) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, dave, chanPointDave, false) } // computeFee calculates the payment fee as specified in BOLT07 func computeFee(baseFee, feeRate, amt lnwire.MilliSatoshi) lnwire.MilliSatoshi { return baseFee + amt*feeRate/1000000 } // testQueryRoutes checks the response of queryroutes. // We'll create the following network topology: // Alice --> Bob --> Carol --> Dave // and query the daemon for routes from Alice to Dave. func testQueryRoutes(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const chanAmt = btcutil.Amount(100000) var networkChans []*lnrpc.ChannelPoint // Open a channel between Alice and Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAlice := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointAlice) // Create Carol and establish a channel from Bob. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Bob); err != nil { t.Fatalf("unable to connect carol to bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, net.Bob) if err != nil { t.Fatalf("unable to send coins to bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointBob := openChannelAndAssert( ctxt, t, net, net.Bob, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointBob) // Create Dave and establish a channel from Carol. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create new nodes: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, carol); err != nil { t.Fatalf("unable to connect dave to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarol := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) networkChans = append(networkChans, chanPointCarol) // Wait for all nodes to have seen all channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"Alice", "Bob", "Carol", "Dave"} for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } point := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d): timeout waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, point, err) } } } // Query for routes to pay from Alice to Dave. const paymentAmt = 1000 routesReq := &lnrpc.QueryRoutesRequest{ PubKey: dave.PubKeyStr, Amt: paymentAmt, NumRoutes: 1, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) routesRes, err := net.Alice.QueryRoutes(ctxt, routesReq) if err != nil { t.Fatalf("unable to get route: %v", err) } const mSat = 1000 feePerHopMSat := computeFee(1000, 1, paymentAmt*mSat) for i, route := range routesRes.Routes { expectedTotalFeesMSat := lnwire.MilliSatoshi(len(route.Hops)-1) * feePerHopMSat expectedTotalAmtMSat := (paymentAmt * mSat) + expectedTotalFeesMSat if route.TotalFees != route.TotalFeesMsat/mSat { t.Fatalf("route %v: total fees %v (msat) does not "+ "round down to %v (sat)", i, route.TotalFeesMsat, route.TotalFees) } if route.TotalFeesMsat != int64(expectedTotalFeesMSat) { t.Fatalf("route %v: total fees in msat expected %v got %v", i, expectedTotalFeesMSat, route.TotalFeesMsat) } if route.TotalAmt != route.TotalAmtMsat/mSat { t.Fatalf("route %v: total amt %v (msat) does not "+ "round down to %v (sat)", i, route.TotalAmtMsat, route.TotalAmt) } if route.TotalAmtMsat != int64(expectedTotalAmtMSat) { t.Fatalf("route %v: total amt in msat expected %v got %v", i, expectedTotalAmtMSat, route.TotalAmtMsat) } // For all hops except the last, we check that fee equals feePerHop // and amount to forward deducts feePerHop on each hop. expectedAmtToForwardMSat := expectedTotalAmtMSat for j, hop := range route.Hops[:len(route.Hops)-1] { expectedAmtToForwardMSat -= feePerHopMSat if hop.Fee != hop.FeeMsat/mSat { t.Fatalf("route %v hop %v: fee %v (msat) does not "+ "round down to %v (sat)", i, j, hop.FeeMsat, hop.Fee) } if hop.FeeMsat != int64(feePerHopMSat) { t.Fatalf("route %v hop %v: fee in msat expected %v got %v", i, j, feePerHopMSat, hop.FeeMsat) } if hop.AmtToForward != hop.AmtToForwardMsat/mSat { t.Fatalf("route %v hop %v: amt to forward %v (msat) does not "+ "round down to %v (sat)", i, j, hop.AmtToForwardMsat, hop.AmtToForward) } if hop.AmtToForwardMsat != int64(expectedAmtToForwardMSat) { t.Fatalf("route %v hop %v: amt to forward in msat "+ "expected %v got %v", i, j, expectedAmtToForwardMSat, hop.AmtToForwardMsat) } } // Last hop should have zero fee and amount to forward should equal // payment amount. hop := route.Hops[len(route.Hops)-1] if hop.Fee != 0 || hop.FeeMsat != 0 { t.Fatalf("route %v hop %v: fee expected 0 got %v (sat) %v (msat)", i, len(route.Hops)-1, hop.Fee, hop.FeeMsat) } if hop.AmtToForward != hop.AmtToForwardMsat/mSat { t.Fatalf("route %v hop %v: amt to forward %v (msat) does not "+ "round down to %v (sat)", i, len(route.Hops)-1, hop.AmtToForwardMsat, hop.AmtToForward) } if hop.AmtToForwardMsat != paymentAmt*mSat { t.Fatalf("route %v hop %v: amt to forward in msat "+ "expected %v got %v", i, len(route.Hops)-1, paymentAmt*mSat, hop.AmtToForwardMsat) } } // We clean up the test case by closing channels that were created for // the duration of the tests. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAlice, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPointBob, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarol, false) } // testRouteFeeCutoff tests that we are able to prevent querying routes and // sending payments that incur a fee higher than the fee limit. func testRouteFeeCutoff(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // For this test, we'll create the following topology: // // --- Bob --- // / \ // Alice ---- ---- Dave // \ / // -- Carol -- // // Alice will attempt to send payments to Dave that should not incur a // fee greater than the fee limit expressed as a percentage of the // amount and as a fixed amount of satoshis. const chanAmt = btcutil.Amount(100000) // Open a channel between Alice and Bob. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAliceBob := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Create Carol's node and open a channel between her and Alice with // Alice being the funder. carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, net.Alice); err != nil { t.Fatalf("unable to connect carol to alice: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, carol) if err != nil { t.Fatalf("unable to send coins to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointAliceCarol := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Create Dave's node and open a channel between him and Bob with Bob // being the funder. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create dave's node: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, dave, net.Bob); err != nil { t.Fatalf("unable to connect dave to bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointBobDave := openChannelAndAssert( ctxt, t, net, net.Bob, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Open a channel between Carol and Dave. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, carol, dave); err != nil { t.Fatalf("unable to connect carol to dave: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointCarolDave := openChannelAndAssert( ctxt, t, net, carol, dave, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Now that all the channels were set up, we'll wait for all the nodes // to have seen all the channels. nodes := []*lntest.HarnessNode{net.Alice, net.Bob, carol, dave} nodeNames := []string{"alice", "bob", "carol", "dave"} networkChans := []*lnrpc.ChannelPoint{ chanPointAliceBob, chanPointAliceCarol, chanPointBobDave, chanPointCarolDave, } for _, chanPoint := range networkChans { for i, node := range nodes { txidHash, err := getChanPointFundingTxid(chanPoint) if err != nil { t.Fatalf("unable to get txid: %v", err) } txid, e := chainhash.NewHash(txidHash) if e != nil { t.Fatalf("unable to create sha hash: %v", e) } outpoint := wire.OutPoint{ Hash: *txid, Index: chanPoint.OutputIndex, } ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = node.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("%s(%d) timed out waiting for "+ "channel(%s) open: %v", nodeNames[i], node.NodeID, outpoint, err) } } } // The payments should only be successful across the route: // Alice -> Bob -> Dave // Therefore, we'll update the fee policy on Carol's side for the // channel between her and Dave to invalidate the route: // Alice -> Carol -> Dave baseFee := int64(10000) feeRate := int64(5) timeLockDelta := uint32(144) expectedPolicy := &lnrpc.RoutingPolicy{ FeeBaseMsat: baseFee, FeeRateMilliMsat: testFeeBase * feeRate, TimeLockDelta: timeLockDelta, MinHtlc: 1000, // default value } updateFeeReq := &lnrpc.PolicyUpdateRequest{ BaseFeeMsat: baseFee, FeeRate: float64(feeRate), TimeLockDelta: timeLockDelta, Scope: &lnrpc.PolicyUpdateRequest_ChanPoint{ ChanPoint: chanPointCarolDave, }, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if _, err := carol.UpdateChannelPolicy(ctxt, updateFeeReq); err != nil { t.Fatalf("unable to update chan policy: %v", err) } // Wait for Alice to receive the channel update from Carol. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceSub := subscribeGraphNotifications(t, ctxt, net.Alice) defer close(aliceSub.quit) waitForChannelUpdate( t, aliceSub, []expectedChanUpdate{ {carol.PubKeyStr, expectedPolicy, chanPointCarolDave}, }, ) // We'll also need the channel IDs for Bob's channels in order to // confirm the route of the payments. listReq := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) listResp, err := net.Bob.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to retrieve bob's channels: %v", err) } var aliceBobChanID, bobDaveChanID uint64 for _, channel := range listResp.Channels { switch channel.RemotePubkey { case net.Alice.PubKeyStr: aliceBobChanID = channel.ChanId case dave.PubKeyStr: bobDaveChanID = channel.ChanId } } if aliceBobChanID == 0 { t.Fatalf("channel between alice and bob not found") } if bobDaveChanID == 0 { t.Fatalf("channel between bob and dave not found") } hopChanIDs := []uint64{aliceBobChanID, bobDaveChanID} // checkRoute is a helper closure to ensure the route contains the // correct intermediate hops. checkRoute := func(route *lnrpc.Route) { if len(route.Hops) != 2 { t.Fatalf("expected two hops, got %d", len(route.Hops)) } for i, hop := range route.Hops { if hop.ChanId != hopChanIDs[i] { t.Fatalf("expected chan id %d, got %d", hopChanIDs[i], hop.ChanId) } } } // We'll be attempting to send two payments from Alice to Dave. One will // have a fee cutoff expressed as a percentage of the amount and the // other will have it expressed as a fixed amount of satoshis. const paymentAmt = 100 carolFee := computeFee(lnwire.MilliSatoshi(baseFee), 1, paymentAmt) // testFeeCutoff is a helper closure that will ensure the different // types of fee limits work as intended when querying routes and sending // payments. testFeeCutoff := func(feeLimit *lnrpc.FeeLimit) { queryRoutesReq := &lnrpc.QueryRoutesRequest{ PubKey: dave.PubKeyStr, Amt: paymentAmt, FeeLimit: feeLimit, NumRoutes: 2, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) routesResp, err := net.Alice.QueryRoutes(ctxt, queryRoutesReq) if err != nil { t.Fatalf("unable to get routes: %v", err) } if len(routesResp.Routes) != 1 { t.Fatalf("expected one route, got %d", len(routesResp.Routes)) } checkRoute(routesResp.Routes[0]) invoice := &lnrpc.Invoice{Value: paymentAmt} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) invoiceResp, err := dave.AddInvoice(ctxt, invoice) if err != nil { t.Fatalf("unable to create invoice: %v", err) } sendReq := &lnrpc.SendRequest{ PaymentRequest: invoiceResp.PaymentRequest, FeeLimit: feeLimit, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) paymentResp, err := net.Alice.SendPaymentSync(ctxt, sendReq) if err != nil { t.Fatalf("unable to send payment: %v", err) } if paymentResp.PaymentError != "" { t.Fatalf("unable to send payment: %v", paymentResp.PaymentError) } checkRoute(paymentResp.PaymentRoute) } // We'll start off using percentages first. Since the fee along the // route using Carol as an intermediate hop is 10% of the payment's // amount, we'll use a lower percentage in order to invalid that route. feeLimitPercent := &lnrpc.FeeLimit{ Limit: &lnrpc.FeeLimit_Percent{baseFee/1000 - 1}, } testFeeCutoff(feeLimitPercent) // Now we'll test using fixed fee limit amounts. Since we computed the // fee for the route using Carol as an intermediate hop earlier, we can // use a smaller value in order to invalidate that route. feeLimitFixed := &lnrpc.FeeLimit{ Limit: &lnrpc.FeeLimit_Fixed{int64(carolFee.ToSatoshis()) - 1}, } testFeeCutoff(feeLimitFixed) // Once we're done, close the channels and shut down the nodes created // throughout this test. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAliceBob, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Alice, chanPointAliceCarol, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPointBobDave, false) ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, carol, chanPointCarolDave, false) } // testSendUpdateDisableChannel ensures that a channel update with the disable // flag set is sent once a channel has been either unilaterally or cooperatively // closed. func testSendUpdateDisableChannel(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() const ( chanAmt = 100000 ) // Open a channel between Alice and Bob and Alice and Carol. These will // be closed later on in order to trigger channel update messages // marking the channels as disabled. ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPointAliceBob := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, lntest.OpenChannelParams{ Amt: chanAmt, }, ) carol, err := net.NewNode("Carol", nil) if err != nil { t.Fatalf("unable to create carol's node: %v", err) } defer shutdownAndAssert(net, t, carol) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Alice, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointAliceCarol := openChannelAndAssert( ctxt, t, net, net.Alice, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // We create a new node Eve that has an inactive channel timeout of // just 2 seconds (down from the default 20m). It will be used to test // channel updates for channels going inactive. eve, err := net.NewNode("Eve", []string{"--inactivechantimeout=2s"}) if err != nil { t.Fatalf("unable to create eve's node: %v", err) } defer shutdownAndAssert(net, t, eve) // Give Eve some coins. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, eve) if err != nil { t.Fatalf("unable to send coins to eve: %v", err) } // Connect Eve to Carol and Bob, and open a channel to carol. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, eve, carol); err != nil { t.Fatalf("unable to connect alice to carol: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, eve, net.Bob); err != nil { t.Fatalf("unable to connect eve to bob: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelOpenTimeout) chanPointEveCarol := openChannelAndAssert( ctxt, t, net, eve, carol, lntest.OpenChannelParams{ Amt: chanAmt, }, ) // Launch a node for Dave which will connect to Bob in order to receive // graph updates from. This will ensure that the channel updates are // propagated throughout the network. dave, err := net.NewNode("Dave", nil) if err != nil { t.Fatalf("unable to create dave's node: %v", err) } defer shutdownAndAssert(net, t, dave) ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) if err := net.ConnectNodes(ctxt, net.Bob, dave); err != nil { t.Fatalf("unable to connect bob to dave: %v", err) } daveSub := subscribeGraphNotifications(t, ctxb, dave) defer close(daveSub.quit) // We should expect to see a channel update with the default routing // policy, except that it should indicate the channel is disabled. expectedPolicy := &lnrpc.RoutingPolicy{ FeeBaseMsat: int64(defaultBitcoinBaseFeeMSat), FeeRateMilliMsat: int64(defaultBitcoinFeeRate), TimeLockDelta: defaultBitcoinTimeLockDelta, MinHtlc: 1000, // default value Disabled: true, } // Let Carol go offline. Since Eve has an inactive timeout of 2s, we // expect her to send an update disabling the channel. restartCarol, err := net.SuspendNode(carol) if err != nil { t.Fatalf("unable to suspend carol: %v", err) } waitForChannelUpdate( t, daveSub, []expectedChanUpdate{ {eve.PubKeyStr, expectedPolicy, chanPointEveCarol}, }, ) // We restart Carol. Since the channel now becomes active again, Eve // should send a ChannelUpdate setting the channel no longer disabled. if err := restartCarol(); err != nil { t.Fatalf("unable to restart carol: %v", err) } expectedPolicy.Disabled = false waitForChannelUpdate( t, daveSub, []expectedChanUpdate{ {eve.PubKeyStr, expectedPolicy, chanPointEveCarol}, }, ) // Close Alice's channels with Bob and Carol cooperatively and // unilaterally respectively. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) _, _, err = net.CloseChannel(ctxt, net.Alice, chanPointAliceBob, false) if err != nil { t.Fatalf("unable to close channel: %v", err) } ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) _, _, err = net.CloseChannel(ctxt, net.Alice, chanPointAliceCarol, true) if err != nil { t.Fatalf("unable to close channel: %v", err) } // Now that the channel close processes have been started, we should // receive an update marking each as disabled. expectedPolicy.Disabled = true waitForChannelUpdate( t, daveSub, []expectedChanUpdate{ {net.Alice.PubKeyStr, expectedPolicy, chanPointAliceBob}, {net.Alice.PubKeyStr, expectedPolicy, chanPointAliceCarol}, }, ) // Finally, close the channels by mining the closing transactions. mineBlocks(t, net, 1, 2) // Also do this check for Eve's channel with Carol. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) _, _, err = net.CloseChannel(ctxt, eve, chanPointEveCarol, false) if err != nil { t.Fatalf("unable to close channel: %v", err) } waitForChannelUpdate( t, daveSub, []expectedChanUpdate{ {eve.PubKeyStr, expectedPolicy, chanPointEveCarol}, }, ) mineBlocks(t, net, 1, 1) } // testAbandonChannel abandones a channel and asserts that it is no // longer open and not in one of the pending closure states. It also // verifies that the abandoned channel is reported as closed with close // type 'abandoned'. func testAbandonChannel(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First establish a channel between Alice and Bob. channelParam := lntest.OpenChannelParams{ Amt: maxBtcFundingAmount, PushAmt: btcutil.Amount(100000), } ctxt, _ := context.WithTimeout(ctxb, channelOpenTimeout) chanPoint := openChannelAndAssert( ctxt, t, net, net.Alice, net.Bob, channelParam) // Wait for channel to be confirmed open. ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err := net.Alice.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("alice didn't report channel: %v", err) } err = net.Bob.WaitForNetworkChannelOpen(ctxt, chanPoint) if err != nil { t.Fatalf("bob didn't report channel: %v", err) } // Send request to abandon channel. abandonChannelRequest := &lnrpc.AbandonChannelRequest{ ChannelPoint: chanPoint, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, err = net.Alice.AbandonChannel(ctxt, abandonChannelRequest) if err != nil { t.Fatalf("unable to abandon channel: %v", err) } // Assert that channel in no longer open. listReq := &lnrpc.ListChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceChannelList, err := net.Alice.ListChannels(ctxt, listReq) if err != nil { t.Fatalf("unable to list channels: %v", err) } if len(aliceChannelList.Channels) != 0 { t.Fatalf("alice should only have no channels open, "+ "instead she has %v", len(aliceChannelList.Channels)) } // Assert that channel is not pending closure. pendingReq := &lnrpc.PendingChannelsRequest{} ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) alicePendingList, err := net.Alice.PendingChannels(ctxt, pendingReq) if err != nil { t.Fatalf("unable to list pending channels: %v", err) } if len(alicePendingList.PendingClosingChannels) != 0 { t.Fatalf("alice should only have no pending closing channels, "+ "instead she has %v", len(alicePendingList.PendingClosingChannels)) } if len(alicePendingList.PendingForceClosingChannels) != 0 { t.Fatalf("alice should only have no pending force closing "+ "channels instead she has %v", len(alicePendingList.PendingForceClosingChannels)) } if len(alicePendingList.WaitingCloseChannels) != 0 { t.Fatalf("alice should only have no waiting close "+ "channels instead she has %v", len(alicePendingList.WaitingCloseChannels)) } // Assert that channel is listed as abandoned. closedReq := &lnrpc.ClosedChannelsRequest{ Abandoned: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) aliceClosedList, err := net.Alice.ClosedChannels(ctxt, closedReq) if err != nil { t.Fatalf("unable to list closed channels: %v", err) } if len(aliceClosedList.Channels) != 1 { t.Fatalf("alice should only have a single abandoned channel, "+ "instead she has %v", len(aliceClosedList.Channels)) } // Now that we're done with the test, the channel can be closed. This is // necessary to avoid unexpected outcomes of other tests that use Bob's // lnd instance. ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) closeChannelAndAssert(ctxt, t, net, net.Bob, chanPoint, true) // Cleanup by mining the force close and sweep transaction. cleanupForceClose(t, net, net.Bob, chanPoint) } // testSweepAllCoins tests that we're able to properly sweep all coins from the // wallet into a single target address at the specified fee rate. func testSweepAllCoins(net *lntest.NetworkHarness, t *harnessTest) { ctxb := context.Background() // First, we'll make a new node, ainz who'll we'll use to test wallet // sweeping. ainz, err := net.NewNode("Ainz", nil) if err != nil { t.Fatalf("unable to create new node: %v", err) } defer shutdownAndAssert(net, t, ainz) // Next, we'll give Ainz exactly 2 utxos of 1 BTC each, with one of // them being p2wkh and the other being a n2wpkh address. ctxt, _ := context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoins(ctxt, btcutil.SatoshiPerBitcoin, ainz) if err != nil { t.Fatalf("unable to send coins to eve: %v", err) } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) err = net.SendCoinsNP2WKH(ctxt, btcutil.SatoshiPerBitcoin, ainz) if err != nil { t.Fatalf("unable to send coins to eve: %v", err) } // With the two coins above mined, we'll now instruct ainz to sweep all // the coins to an external address not under its control. minerAddr, err := net.Miner.NewAddress() if err != nil { t.Fatalf("unable to create new miner addr: %v", err) } sweepReq := &lnrpc.SendCoinsRequest{ Addr: minerAddr.String(), SendAll: true, } ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) _, err = ainz.SendCoins(ctxt, sweepReq) if err != nil { t.Fatalf("unable to sweep coins: %v", err) } // We'll mine a block wish should include the sweep transaction we // generated above. block := mineBlocks(t, net, 1, 1)[0] // The sweep transaction should have exactly two inputs as we only had // two UTXOs in the wallet. sweepTx := block.Transactions[1] if len(sweepTx.TxIn) != 2 { t.Fatalf("expected 2 inputs instead have %v", len(sweepTx.TxIn)) } // Finally, Ainz should now have no coins at all within his wallet. balReq := &lnrpc.WalletBalanceRequest{} resp, err := ainz.WalletBalance(ctxt, balReq) if err != nil { t.Fatalf("unable to get ainz's balance: %v", err) } switch { case resp.ConfirmedBalance != 0: t.Fatalf("expected no confirmed balance, instead have %v", resp.ConfirmedBalance) case resp.UnconfirmedBalance != 0: t.Fatalf("expected no unconfirmed balance, instead have %v", resp.UnconfirmedBalance) } // If we try again, but this time specifying an amount, then the call // should fail. sweepReq.Amount = 10000 _, err = ainz.SendCoins(ctxt, sweepReq) if err == nil { t.Fatalf("sweep attempt should fail") } } type testCase struct { name string test func(net *lntest.NetworkHarness, t *harnessTest) } var testsCases = []*testCase{ { name: "sweep coins", test: testSweepAllCoins, }, { name: "onchain fund recovery", test: testOnchainFundRecovery, }, { name: "basic funding flow", test: testBasicChannelFunding, }, { name: "unconfirmed channel funding", test: testUnconfirmedChannelFunding, }, { name: "update channel policy", test: testUpdateChannelPolicy, }, { name: "open channel reorg test", test: testOpenChannelAfterReorg, }, { name: "disconnecting target peer", test: testDisconnectingTargetPeer, }, { name: "graph topology notifications", test: testGraphTopologyNotifications, }, { name: "funding flow persistence", test: testChannelFundingPersistence, }, { name: "channel force closure", test: testChannelForceClosure, }, { name: "channel balance", test: testChannelBalance, }, { name: "channel unsettled balance", test: testChannelUnsettledBalance, }, { name: "single hop invoice", test: testSingleHopInvoice, }, { name: "sphinx replay persistence", test: testSphinxReplayPersistence, }, { name: "list outgoing payments", test: testListPayments, }, { name: "max pending channel", test: testMaxPendingChannels, }, { name: "multi-hop payments", test: testMultiHopPayments, }, { name: "single-hop send to route", test: testSingleHopSendToRoute, }, { name: "multi-hop send to route", test: testMultiHopSendToRoute, }, { name: "send to route error propagation", test: testSendToRouteErrorPropagation, }, { name: "unannounced channels", test: testUnannouncedChannels, }, { name: "private channels", test: testPrivateChannels, }, { name: "invoice routing hints", test: testInvoiceRoutingHints, }, { name: "multi-hop payments over private channels", test: testMultiHopOverPrivateChannels, }, { name: "multiple channel creation and update subscription", test: testBasicChannelCreationAndUpdates, }, { name: "invoice update subscription", test: testInvoiceSubscriptions, }, { name: "multi-hop htlc error propagation", test: testHtlcErrorPropagation, }, // TODO(roasbeef): multi-path integration test { name: "node announcement", test: testNodeAnnouncement, }, { name: "node sign verify", test: testNodeSignVerify, }, { name: "async payments benchmark", test: testAsyncPayments, }, { name: "async bidirectional payments", test: testBidirectionalAsyncPayments, }, { // bob: outgoing our commit timeout // carol: incoming their commit watch and see timeout name: "test multi-hop htlc local force close immediate expiry", test: testMultiHopHtlcLocalTimeout, }, { // bob: outgoing watch and see, they sweep on chain // carol: incoming our commit, know preimage name: "test multi-hop htlc receiver chain claim", test: testMultiHopReceiverChainClaim, }, { // bob: outgoing our commit watch and see timeout // carol: incoming their commit watch and see timeout name: "test multi-hop local force close on-chain htlc timeout", test: testMultiHopLocalForceCloseOnChainHtlcTimeout, }, { // bob: outgoing their commit watch and see timeout // carol: incoming our commit watch and see timeout name: "test multi-hop remote force close on-chain htlc timeout", test: testMultiHopRemoteForceCloseOnChainHtlcTimeout, }, { // bob: outgoing our commit watch and see, they sweep on chain // bob: incoming our commit watch and learn preimage // carol: incoming their commit know preimage name: "test multi-hop htlc local chain claim", test: testMultiHopHtlcLocalChainClaim, }, { // bob: outgoing their commit watch and see, they sweep on chain // bob: incoming their commit watch and learn preimage // carol: incoming our commit know preimage name: "test multi-hop htlc remote chain claim", test: testMultiHopHtlcRemoteChainClaim, }, { name: "switch circuit persistence", test: testSwitchCircuitPersistence, }, { name: "switch offline delivery", test: testSwitchOfflineDelivery, }, { name: "switch offline delivery persistence", test: testSwitchOfflineDeliveryPersistence, }, { name: "switch offline delivery outgoing offline", test: testSwitchOfflineDeliveryOutgoingOffline, }, { // TODO(roasbeef): test always needs to be last as Bob's state // is borked since we trick him into attempting to cheat Alice? name: "revoked uncooperative close retribution", test: testRevokedCloseRetribution, }, { name: "failing link", test: testFailingChannel, }, { name: "garbage collect link nodes", test: testGarbageCollectLinkNodes, }, { name: "abandonchannel", test: testAbandonChannel, }, { name: "revoked uncooperative close retribution zero value remote output", test: testRevokedCloseRetributionZeroValueRemoteOutput, }, { name: "revoked uncooperative close retribution remote hodl", test: testRevokedCloseRetributionRemoteHodl, }, { name: "data loss protection", test: testDataLossProtection, }, { name: "query routes", test: testQueryRoutes, }, { name: "route fee cutoff", test: testRouteFeeCutoff, }, { name: "send update disable channel", test: testSendUpdateDisableChannel, }, } // TestLightningNetworkDaemon performs a series of integration tests amongst a // programmatically driven network of lnd nodes. func TestLightningNetworkDaemon(t *testing.T) { ht := newHarnessTest(t) // Start a btcd chain backend. chainBackend, cleanUp, err := lntest.NewBtcdBackend() if err != nil { ht.Fatalf("unable to start btcd: %v", err) } defer cleanUp() // Declare the network harness here to gain access to its // 'OnTxAccepted' call back. var lndHarness *lntest.NetworkHarness // Create an instance of the btcd's rpctest.Harness that will act as // the miner for all tests. This will be used to fund the wallets of // the nodes within the test network and to drive blockchain related // events within the network. Revert the default setting of accepting // non-standard transactions on simnet to reject them. Transactions on // the lightning network should always be standard to get better // guarantees of getting included in to blocks. // // We will also connect it to our chain backend. minerLogDir := "./.minerlogs" args := []string{ "--rejectnonstd", "--txindex", "--debuglevel=debug", "--logdir=" + minerLogDir, "--trickleinterval=100ms", "--connect=" + chainBackend.P2PAddr(), } handlers := &rpcclient.NotificationHandlers{ OnTxAccepted: func(hash *chainhash.Hash, amt btcutil.Amount) { lndHarness.OnTxAccepted(hash) }, } miner, err := rpctest.New(harnessNetParams, handlers, args) if err != nil { ht.Fatalf("unable to create mining node: %v", err) } defer func() { miner.TearDown() // After shutting down the miner, we'll make a copy of the log // file before deleting the temporary log dir. logFile := fmt.Sprintf( "%s/%s/btcd.log", minerLogDir, harnessNetParams.Name, ) err := lntest.CopyFile("./output_btcd_miner.log", logFile) if err != nil { fmt.Printf("unable to copy file: %v\n", err) } if err = os.RemoveAll(minerLogDir); err != nil { fmt.Printf("Cannot remove dir %s: %v\n", minerLogDir, err) } }() if err := miner.SetUp(true, 50); err != nil { ht.Fatalf("unable to set up mining node: %v", err) } if err := miner.Node.NotifyNewTransactions(false); err != nil { ht.Fatalf("unable to request transaction notifications: %v", err) } // Now we can set up our test harness (LND instance), with the chain // backend we just created. lndHarness, err = lntest.NewNetworkHarness(miner, chainBackend) if err != nil { ht.Fatalf("unable to create lightning network harness: %v", err) } defer lndHarness.TearDownAll() // Spawn a new goroutine to watch for any fatal errors that any of the // running lnd processes encounter. If an error occurs, then the test // case should naturally as a result and we log the server error here to // help debug. go func() { for { select { case err, more := <-lndHarness.ProcessErrors(): if !more { return } ht.Logf("lnd finished with error (stderr):\n%v", err) } } }() // Next mine enough blocks in order for segwit and the CSV package // soft-fork to activate on SimNet. numBlocks := chaincfg.SimNetParams.MinerConfirmationWindow * 2 if _, err := miner.Node.Generate(numBlocks); err != nil { ht.Fatalf("unable to generate blocks: %v", err) } // With the btcd harness created, we can now complete the // initialization of the network. args - list of lnd arguments, // example: "--debuglevel=debug" // TODO(roasbeef): create master balanced channel with all the monies? if err = lndHarness.SetUp(nil); err != nil { ht.Fatalf("unable to set up test lightning network: %v", err) } t.Logf("Running %v integration tests", len(testsCases)) for _, testCase := range testsCases { logLine := fmt.Sprintf("STARTING ============ %v ============\n", testCase.name) err := lndHarness.EnsureConnected( context.Background(), lndHarness.Alice, lndHarness.Bob, ) if err != nil { t.Fatalf("unable to connect alice to bob: %v", err) } if err := lndHarness.Alice.AddToLog(logLine); err != nil { t.Fatalf("unable to add to log: %v", err) } if err := lndHarness.Bob.AddToLog(logLine); err != nil { t.Fatalf("unable to add to log: %v", err) } success := t.Run(testCase.name, func(t1 *testing.T) { ht := newHarnessTest(t1) ht.RunTestCase(testCase, lndHarness) }) // Stop at the first failure. Mimic behavior of original test // framework. if !success { break } } }