lnd test: refactor testDataLossProtection
This extracts part of the test into a new helper method timeTravel, which can be used to easily reset a node back to a state where channel state is lost.
This commit is contained in:
Johan T. Halseth
parent
0ca7c8c5f8
commit
13098a595a
311
lnd_test.go
311
lnd_test.go
@ -7005,12 +7005,6 @@ func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) {
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}
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defer shutdownAndAssert(net, t, dave)
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// We must let Dave communicate with Carol before they are able to open
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// channel, so we connect them.
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if err := net.ConnectNodes(ctxb, carol, dave); err != nil {
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t.Fatalf("unable to connect dave to carol: %v", err)
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}
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// Before we make a channel, we'll load up Carol with some coins sent
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// directly from the miner.
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err = net.SendCoins(ctxb, btcutil.SatoshiPerBitcoin, carol)
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@ -7018,15 +7012,165 @@ func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) {
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t.Fatalf("unable to send coins to carol: %v", err)
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}
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// We'll first open up a channel between them with a 0.5 BTC value.
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// timeTravel is a method that will make Carol open a channel to the
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// passed node, settle a series of payments, then reset the node back
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// to the state before the payments happened. When this method returns
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// the node will be unaware of the new state updates. The returned
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// function can be used to restart the node in this state.
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timeTravel := func(node *lntest.HarnessNode) (func() error,
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*lnrpc.ChannelPoint, int64, error) {
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// We must let the node communicate with Carol before they are
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// able to open channel, so we connect them.
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if err := net.EnsureConnected(ctxb, carol, node); err != nil {
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t.Fatalf("unable to connect %v to carol: %v",
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node.Name(), err)
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}
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// We'll first open up a channel between them with a 0.5 BTC
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// value.
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ctxt, _ := context.WithTimeout(ctxb, timeout)
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chanPoint := openChannelAndAssert(
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ctxt, t, net, carol, dave,
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ctxt, t, net, carol, node,
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lntest.OpenChannelParams{
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Amt: chanAmt,
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},
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)
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// With the channel open, we'll create a few invoices for the
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// node that Carol will pay to in order to advance the state of
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// the channel.
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// TODO(halseth): have dangling HTLCs on the commitment, able to
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// retrive funds?
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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payReqs, _, _, err := createPayReqs(
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ctxt, node, paymentAmt, numInvoices,
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)
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if err != nil {
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t.Fatalf("unable to create pay reqs: %v", err)
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}
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// Wait for Carol to receive the channel edge from the funding
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// manager.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint)
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if err != nil {
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t.Fatalf("carol didn't see the carol->%s channel "+
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"before timeout: %v", node.Name(), err)
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}
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// Send payments from Carol using 3 of the payment hashes
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// generated above.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = completePaymentRequests(ctxt, carol,
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payReqs[:numInvoices/2], true)
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if err != nil {
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t.Fatalf("unable to send payments: %v", err)
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}
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// Next query for the node's channel state, as we sent 3
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// payments of 10k satoshis each, it should now see his balance
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// as being 30k satoshis.
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var nodeChan *lnrpc.Channel
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var predErr error
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err = lntest.WaitPredicate(func() bool {
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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bChan, err := getChanInfo(ctxt, node)
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if err != nil {
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t.Fatalf("unable to get channel info: %v", err)
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}
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if bChan.LocalBalance != 30000 {
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predErr = fmt.Errorf("balance is incorrect, "+
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"got %v, expected %v",
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bChan.LocalBalance, 30000)
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return false
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}
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nodeChan = bChan
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return true
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}, time.Second*15)
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if err != nil {
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t.Fatalf("%v", predErr)
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}
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// Grab the current commitment height (update number), we'll
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// later revert him to this state after additional updates to
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// revoke this state.
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stateNumPreCopy := nodeChan.NumUpdates
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// Create a temporary file to house the database state at this
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// particular point in history.
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tempDbPath, err := ioutil.TempDir("", node.Name()+"-past-state")
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if err != nil {
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t.Fatalf("unable to create temp db folder: %v", err)
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}
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tempDbFile := filepath.Join(tempDbPath, "channel.db")
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defer os.Remove(tempDbPath)
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// With the temporary file created, copy the current state into
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// the temporary file we created above. Later after more
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// updates, we'll restore this state.
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if err := copyFile(tempDbFile, node.DBPath()); err != nil {
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t.Fatalf("unable to copy database files: %v", err)
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}
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// Finally, send more payments from , using the remaining
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// payment hashes.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = completePaymentRequests(ctxt, carol,
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payReqs[numInvoices/2:], true)
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if err != nil {
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t.Fatalf("unable to send payments: %v", err)
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}
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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nodeChan, err = getChanInfo(ctxt, node)
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if err != nil {
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t.Fatalf("unable to get dave chan info: %v", err)
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}
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// Now we shutdown the node, copying over the its temporary
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// database state which has the *prior* channel state over his
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// current most up to date state. With this, we essentially
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// force the node to travel back in time within the channel's
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// history.
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if err = net.RestartNode(node, func() error {
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return os.Rename(tempDbFile, node.DBPath())
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}); err != nil {
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t.Fatalf("unable to restart node: %v", err)
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}
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// Now query for the channel state, it should show that it's at
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// a state number in the past, not the *latest* state.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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nodeChan, err = getChanInfo(ctxt, node)
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if err != nil {
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t.Fatalf("unable to get dave chan info: %v", err)
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}
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if nodeChan.NumUpdates != stateNumPreCopy {
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t.Fatalf("db copy failed: %v", nodeChan.NumUpdates)
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}
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assertNodeNumChannels(t, ctxb, node, 1)
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balReq := &lnrpc.WalletBalanceRequest{}
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balResp, err := node.WalletBalance(ctxb, balReq)
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if err != nil {
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t.Fatalf("unable to get dave's balance: %v", err)
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}
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restart, err := net.SuspendNode(node)
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if err != nil {
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t.Fatalf("unable to suspend node: %v", err)
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}
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return restart, chanPoint, balResp.ConfirmedBalance, nil
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}
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// Reset Dave to a state where he has an outdated channel state.
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restartDave, _, daveStartingBalance, err := timeTravel(dave)
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if err != nil {
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t.Fatalf("unable to time travel dave: %v", err)
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}
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// We a´make a note of the nodes' current on-chain balances, to make
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// sure they are able to retrieve the channel funds eventually,
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balReq := &lnrpc.WalletBalanceRequest{}
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@ -7036,152 +7180,14 @@ func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) {
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}
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carolStartingBalance := carolBalResp.ConfirmedBalance
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daveBalResp, err := dave.WalletBalance(ctxb, balReq)
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if err != nil {
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t.Fatalf("unable to get dave's balance: %v", err)
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// Restart Dave to trigger a channel resync.
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if err := restartDave(); err != nil {
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t.Fatalf("unable to restart dave: %v", err)
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}
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daveStartingBalance := daveBalResp.ConfirmedBalance
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// With the channel open, we'll create a few invoices for Dave that
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// Carol will pay to in order to advance the state of the channel.
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// TODO(halseth): have dangling HTLCs on the commitment, able to
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// retrive funds?
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davePayReqs := make([]string, numInvoices)
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for i := 0; i < numInvoices; i++ {
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preimage := bytes.Repeat([]byte{byte(17 - i)}, 32)
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invoice := &lnrpc.Invoice{
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Memo: "testing",
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RPreimage: preimage,
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Value: paymentAmt,
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}
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resp, err := dave.AddInvoice(ctxb, invoice)
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if err != nil {
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t.Fatalf("unable to add invoice: %v", err)
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}
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davePayReqs[i] = resp.PaymentRequest
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}
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// As we'll be querying the state of Dave's channels frequently we'll
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// create a closure helper function for the purpose.
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getDaveChanInfo := func() (*lnrpc.Channel, error) {
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req := &lnrpc.ListChannelsRequest{}
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daveChannelInfo, err := dave.ListChannels(ctxb, req)
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if err != nil {
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return nil, err
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}
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if len(daveChannelInfo.Channels) != 1 {
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t.Fatalf("dave should only have a single channel, "+
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"instead he has %v",
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len(daveChannelInfo.Channels))
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}
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return daveChannelInfo.Channels[0], nil
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}
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// Wait for Carol to receive the channel edge from the funding manager.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = carol.WaitForNetworkChannelOpen(ctxt, chanPoint)
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if err != nil {
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t.Fatalf("carol didn't see the carol->dave channel before "+
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"timeout: %v", err)
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}
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// Send payments from Carol to Dave using 3 of Dave's payment hashes
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// generated above.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = completePaymentRequests(ctxt, carol, davePayReqs[:numInvoices/2],
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true)
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if err != nil {
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t.Fatalf("unable to send payments: %v", err)
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}
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// Next query for Dave's channel state, as we sent 3 payments of 10k
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// satoshis each, Dave should now see his balance as being 30k satoshis.
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var daveChan *lnrpc.Channel
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var predErr error
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err = lntest.WaitPredicate(func() bool {
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bChan, err := getDaveChanInfo()
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if err != nil {
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t.Fatalf("unable to get dave's channel info: %v", err)
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}
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if bChan.LocalBalance != 30000 {
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predErr = fmt.Errorf("dave's balance is incorrect, "+
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"got %v, expected %v", bChan.LocalBalance,
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30000)
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return false
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}
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daveChan = bChan
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return true
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}, time.Second*15)
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if err != nil {
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t.Fatalf("%v", predErr)
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}
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// Grab Dave's current commitment height (update number), we'll later
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// revert him to this state after additional updates to revoke this
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// state.
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daveStateNumPreCopy := daveChan.NumUpdates
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// Create a temporary file to house Dave's database state at this
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// particular point in history.
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daveTempDbPath, err := ioutil.TempDir("", "dave-past-state")
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if err != nil {
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t.Fatalf("unable to create temp db folder: %v", err)
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}
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daveTempDbFile := filepath.Join(daveTempDbPath, "channel.db")
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defer os.Remove(daveTempDbPath)
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// With the temporary file created, copy Dave's current state into the
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// temporary file we created above. Later after more updates, we'll
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// restore this state.
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if err := copyFile(daveTempDbFile, dave.DBPath()); err != nil {
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t.Fatalf("unable to copy database files: %v", err)
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}
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// Finally, send payments from Carol to Dave, consuming Dave's remaining
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// payment hashes.
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ctxt, _ = context.WithTimeout(ctxb, timeout)
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err = completePaymentRequests(ctxt, carol, davePayReqs[numInvoices/2:],
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true)
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if err != nil {
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t.Fatalf("unable to send payments: %v", err)
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}
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daveChan, err = getDaveChanInfo()
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if err != nil {
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t.Fatalf("unable to get dave chan info: %v", err)
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}
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// Now we shutdown Dave, copying over the his temporary database state
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// which has the *prior* channel state over his current most up to date
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// state. With this, we essentially force Dave to travel back in time
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// within the channel's history.
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if err = net.RestartNode(dave, func() error {
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return os.Rename(daveTempDbFile, dave.DBPath())
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}); err != nil {
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t.Fatalf("unable to restart node: %v", err)
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}
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// Now query for Dave's channel state, it should show that he's at a
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// state number in the past, not the *latest* state.
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daveChan, err = getDaveChanInfo()
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if err != nil {
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t.Fatalf("unable to get dave chan info: %v", err)
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}
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if daveChan.NumUpdates != daveStateNumPreCopy {
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t.Fatalf("db copy failed: %v", daveChan.NumUpdates)
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}
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assertNodeNumChannels(t, ctxb, dave, 1)
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// Upon reconnection, the nodes should detect that Dave is out of sync.
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if err := net.ConnectNodes(ctxb, carol, dave); err != nil {
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t.Fatalf("unable to connect dave to carol: %v", err)
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}
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// Carol should force close the channel using her latest commitment.
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forceClose, err := waitForTxInMempool(net.Miner.Node, 5*time.Second)
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forceClose, err := waitForTxInMempool(net.Miner.Node, 15*time.Second)
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if err != nil {
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t.Fatalf("unable to find Carol's force close tx in mempool: %v",
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err)
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@ -7229,10 +7235,11 @@ func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) {
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// We query Dave's balance to make sure it increased after the channel
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// closed. This checks that he was able to sweep the funds he had in
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// the channel.
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daveBalResp, err = dave.WalletBalance(ctxb, balReq)
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daveBalResp, err := dave.WalletBalance(ctxb, balReq)
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if err != nil {
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t.Fatalf("unable to get dave's balance: %v", err)
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}
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daveBalance := daveBalResp.ConfirmedBalance
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if daveBalance <= daveStartingBalance {
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t.Fatalf("expected dave to have balance above %d, intead had %v",
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@ -7241,7 +7248,7 @@ func testDataLossProtection(net *lntest.NetworkHarness, t *harnessTest) {
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// After the Carol's output matures, she should also reclaim her funds.
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mineBlocks(t, net, defaultCSV-1)
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carolSweep, err := waitForTxInMempool(net.Miner.Node, 5*time.Second)
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carolSweep, err := waitForTxInMempool(net.Miner.Node, 15*time.Second)
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if err != nil {
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t.Fatalf("unable to find Carol's sweep tx in mempool: %v", err)
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}
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