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275 lines
9.5 KiB
275 lines
9.5 KiB
package itest |
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import ( |
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"context" |
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"github.com/btcsuite/btcd/wire" |
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"github.com/lightningnetwork/lnd/lncfg" |
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"github.com/lightningnetwork/lnd/lnrpc" |
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"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc" |
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"github.com/lightningnetwork/lnd/lnrpc/routerrpc" |
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"github.com/lightningnetwork/lnd/lntest" |
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"github.com/lightningnetwork/lnd/lntest/wait" |
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"github.com/lightningnetwork/lnd/lntypes" |
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"github.com/stretchr/testify/require" |
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) |
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// testMultiHopHtlcRemoteChainClaim tests that in the multi-hop HTLC scenario, |
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// if the remote party goes to chain while we have an incoming HTLC, then when |
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// we found out the preimage via the witness beacon, we properly settle the |
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// HTLC directly on-chain using the preimage in order to ensure that we don't |
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// lose any funds. |
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func testMultiHopHtlcRemoteChainClaim(net *lntest.NetworkHarness, t *harnessTest, |
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alice, bob *lntest.HarnessNode, c commitType) { |
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ctxb := context.Background() |
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// First, we'll create a three hop network: Alice -> Bob -> Carol, with |
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// Carol refusing to actually settle or directly cancel any HTLC's |
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// self. |
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aliceChanPoint, bobChanPoint, carol := createThreeHopNetwork( |
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t, net, alice, bob, false, c, |
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) |
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// Clean up carol's node when the test finishes. |
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defer shutdownAndAssert(net, t, carol) |
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// With the network active, we'll now add a new hodl invoice at Carol's |
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// end. Make sure the cltv expiry delta is large enough, otherwise Bob |
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// won't send out the outgoing htlc. |
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const invoiceAmt = 100000 |
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preimage := lntypes.Preimage{1, 2, 5} |
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payHash := preimage.Hash() |
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invoiceReq := &invoicesrpc.AddHoldInvoiceRequest{ |
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Value: invoiceAmt, |
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CltvExpiry: 40, |
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Hash: payHash[:], |
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} |
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ctxt, cancel := context.WithTimeout(ctxb, defaultTimeout) |
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defer cancel() |
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carolInvoice, err := carol.AddHoldInvoice(ctxt, invoiceReq) |
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require.NoError(t.t, err) |
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// Now that we've created the invoice, we'll send a single payment from |
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// Alice to Carol. We won't wait for the response however, as Carol |
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// will not immediately settle the payment. |
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ctx, cancel := context.WithCancel(ctxb) |
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defer cancel() |
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_, err = alice.RouterClient.SendPaymentV2( |
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ctx, &routerrpc.SendPaymentRequest{ |
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PaymentRequest: carolInvoice.PaymentRequest, |
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TimeoutSeconds: 60, |
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FeeLimitMsat: noFeeLimitMsat, |
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}, |
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) |
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require.NoError(t.t, err) |
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// At this point, all 3 nodes should now have an active channel with |
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// the created HTLC pending on all of them. |
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nodes := []*lntest.HarnessNode{alice, bob, carol} |
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err = wait.NoError(func() error { |
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return assertActiveHtlcs(nodes, payHash[:]) |
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}, defaultTimeout) |
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require.NoError(t.t, err) |
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// Wait for carol to mark invoice as accepted. There is a small gap to |
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// bridge between adding the htlc to the channel and executing the exit |
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// hop logic. |
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waitForInvoiceAccepted(t, carol, payHash) |
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// Increase the fee estimate so that the following force close tx will |
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// be cpfp'ed. |
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net.SetFeeEstimate(30000) |
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// Next, Alice decides that she wants to exit the channel, so she'll |
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// immediately force close the channel by broadcast her commitment |
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// transaction. |
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ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout) |
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aliceForceClose := closeChannelAndAssertType( |
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ctxt, t, net, alice, aliceChanPoint, c == commitTypeAnchors, |
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true, |
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) |
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// Wait for the channel to be marked pending force close. |
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ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) |
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err = waitForChannelPendingForceClose(ctxt, alice, aliceChanPoint) |
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require.NoError(t.t, err) |
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// After closeChannelAndAssertType returns, it has mined a block so now |
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// bob will attempt to redeem his anchor commitment (if the channel |
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// type is of that type). |
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if c == commitTypeAnchors { |
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_, err = waitForNTxsInMempool( |
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net.Miner.Client, 1, minerMempoolTimeout, |
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) |
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if err != nil { |
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t.Fatalf("unable to find bob's anchor commit sweep: %v", |
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err) |
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} |
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} |
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// Mine enough blocks for Alice to sweep her funds from the force |
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// closed channel. closeChannelAndAssertType() already mined a block |
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// containing the commitment tx and the commit sweep tx will be |
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// broadcast immediately before it can be included in a block, so mine |
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// one less than defaultCSV in order to perform mempool assertions. |
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_, err = net.Miner.Client.Generate(defaultCSV - 1) |
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require.NoError(t.t, err) |
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// Alice should now sweep her funds. |
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_, err = waitForNTxsInMempool( |
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net.Miner.Client, 1, minerMempoolTimeout, |
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) |
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require.NoError(t.t, err) |
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// Suspend bob, so Carol is forced to go on chain. |
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restartBob, err := net.SuspendNode(bob) |
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require.NoError(t.t, err) |
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// Settle invoice. This will just mark the invoice as settled, as there |
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// is no link anymore to remove the htlc from the commitment tx. For |
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// this test, it is important to actually settle and not leave the |
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// invoice in the accepted state, because without a known preimage, the |
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// channel arbitrator won't go to chain. |
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ctx, cancel = context.WithTimeout(ctxb, defaultTimeout) |
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defer cancel() |
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_, err = carol.SettleInvoice(ctx, &invoicesrpc.SettleInvoiceMsg{ |
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Preimage: preimage[:], |
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}) |
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require.NoError(t.t, err) |
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// We'll now mine enough blocks so Carol decides that she needs to go |
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// on-chain to claim the HTLC as Bob has been inactive. |
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numBlocks := padCLTV(uint32( |
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invoiceReq.CltvExpiry-lncfg.DefaultIncomingBroadcastDelta, |
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) - defaultCSV) |
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_, err = net.Miner.Client.Generate(numBlocks) |
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require.NoError(t.t, err) |
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expectedTxes := 1 |
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if c == commitTypeAnchors { |
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expectedTxes = 2 |
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} |
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// Carol's commitment transaction should now be in the mempool. If |
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// there are anchors, Carol also sweeps her anchor. |
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_, err = waitForNTxsInMempool( |
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net.Miner.Client, expectedTxes, minerMempoolTimeout, |
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) |
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require.NoError(t.t, err) |
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bobFundingTxid, err := lnrpc.GetChanPointFundingTxid(bobChanPoint) |
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require.NoError(t.t, err) |
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carolFundingPoint := wire.OutPoint{ |
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Hash: *bobFundingTxid, |
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Index: bobChanPoint.OutputIndex, |
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} |
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// The closing transaction should be spending from the funding |
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// transaction. |
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closingTx := getSpendingTxInMempool( |
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t, net.Miner.Client, minerMempoolTimeout, carolFundingPoint, |
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) |
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closingTxid := closingTx.TxHash() |
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// Mine a block, which should contain: the commitment, possibly an |
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// anchor sweep and the coinbase tx. |
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block := mineBlocks(t, net, 1, expectedTxes)[0] |
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require.Len(t.t, block.Transactions, expectedTxes+1) |
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assertTxInBlock(t, block, &closingTxid) |
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// Restart bob again. |
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err = restartBob() |
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require.NoError(t.t, err) |
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// After the force close transacion is mined, Carol should broadcast her |
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// second level HTLC transacion. Bob will broadcast a sweep tx to sweep |
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// his output in the channel with Carol. He can do this immediately, as |
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// the output is not timelocked since Carol was the one force closing. |
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// If there are anchors, Bob should also sweep his. |
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expectedTxes = 2 |
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if c == commitTypeAnchors { |
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expectedTxes = 3 |
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} |
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txes, err := getNTxsFromMempool( |
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net.Miner.Client, expectedTxes, minerMempoolTimeout, |
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) |
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require.NoError(t.t, err) |
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// All transactions should be pending from the commitment transaction. |
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assertAllTxesSpendFrom(t, txes, closingTxid) |
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// Mine a block to confirm the two transactions (+ coinbase). |
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block = mineBlocks(t, net, 1, expectedTxes)[0] |
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require.Len(t.t, block.Transactions, expectedTxes+1) |
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// Keep track of the second level tx maturity. |
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carolSecondLevelCSV := uint32(defaultCSV) |
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// When Bob notices Carol's second level transaction in the block, he |
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// will extract the preimage and broadcast a sweep tx to directly claim |
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// the HTLC in his (already closed) channel with Alice. |
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bobHtlcSweep, err := waitForTxInMempool( |
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net.Miner.Client, minerMempoolTimeout, |
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) |
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require.NoError(t.t, err) |
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// It should spend from the commitment in the channel with Alice. |
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tx, err := net.Miner.Client.GetRawTransaction(bobHtlcSweep) |
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require.NoError(t.t, err) |
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require.Equal( |
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t.t, *aliceForceClose, tx.MsgTx().TxIn[0].PreviousOutPoint.Hash, |
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) |
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// We'll now mine a block which should confirm Bob's HTLC sweep |
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// transaction. |
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block = mineBlocks(t, net, 1, 1)[0] |
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require.Len(t.t, block.Transactions, 2) |
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assertTxInBlock(t, block, bobHtlcSweep) |
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carolSecondLevelCSV-- |
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// Now that the sweeping transaction has been confirmed, Bob should now |
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// recognize that all contracts have been fully resolved, and show no |
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// pending close channels. |
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ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) |
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err = waitForNumChannelPendingForceClose(ctxt, bob, 0, nil) |
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require.NoError(t.t, err) |
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// If we then mine 3 additional blocks, Carol's second level tx will |
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// mature, and she should pull the funds. |
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_, err = net.Miner.Client.Generate(carolSecondLevelCSV) |
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require.NoError(t.t, err) |
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carolSweep, err := waitForTxInMempool( |
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net.Miner.Client, minerMempoolTimeout, |
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) |
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require.NoError(t.t, err) |
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// When Carol's sweep gets confirmed, she should have no more pending |
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// channels. |
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block = mineBlocks(t, net, 1, 1)[0] |
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assertTxInBlock(t, block, carolSweep) |
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ctxt, _ = context.WithTimeout(ctxb, defaultTimeout) |
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err = waitForNumChannelPendingForceClose(ctxt, carol, 0, nil) |
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require.NoError(t.t, err) |
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// The invoice should show as settled for Carol, indicating that it was |
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// swept on-chain. |
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invoicesReq := &lnrpc.ListInvoiceRequest{} |
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invoicesResp, err := carol.ListInvoices(ctxb, invoicesReq) |
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require.NoError(t.t, err) |
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require.Len(t.t, invoicesResp.Invoices, 1) |
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invoice := invoicesResp.Invoices[0] |
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require.Equal(t.t, lnrpc.Invoice_SETTLED, invoice.State) |
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require.Equal(t.t, int64(invoiceAmt), invoice.AmtPaidSat) |
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// Finally, check that the Alice's payment is correctly marked |
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// succeeded. |
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ctxt, _ = context.WithTimeout(ctxt, defaultTimeout) |
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err = checkPaymentStatus( |
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ctxt, alice, preimage, lnrpc.Payment_SUCCEEDED, |
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) |
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require.NoError(t.t, err) |
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}
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