mirror of
https://github.com/lightninglabs/loop
synced 2024-11-04 06:00:21 +00:00
596 lines
17 KiB
Go
596 lines
17 KiB
Go
package loop
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import (
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"context"
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"errors"
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"reflect"
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"testing"
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"time"
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"github.com/btcsuite/btcd/blockchain"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/lightninglabs/lndclient"
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"github.com/lightninglabs/loop/loopdb"
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"github.com/lightninglabs/loop/sweep"
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"github.com/lightninglabs/loop/test"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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"github.com/stretchr/testify/require"
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)
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// TestLoopOutPaymentParameters tests the first part of the loop out process up
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// to the point where the off-chain payments are made.
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func TestLoopOutPaymentParameters(t *testing.T) {
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defer test.Guard(t)()
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// Set up test context objects.
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lnd := test.NewMockLnd()
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ctx := test.NewContext(t, lnd)
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server := newServerMock(lnd)
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store := newStoreMock(t)
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expiryChan := make(chan time.Time)
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timerFactory := func(_ time.Duration) <-chan time.Time {
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return expiryChan
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}
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height := int32(600)
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cfg := &swapConfig{
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lnd: &lnd.LndServices,
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store: store,
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server: server,
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}
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sweeper := &sweep.Sweeper{Lnd: &lnd.LndServices}
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blockEpochChan := make(chan interface{})
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statusChan := make(chan SwapInfo)
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const maxParts = 5
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// Initiate the swap.
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req := *testRequest
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req.OutgoingChanSet = loopdb.ChannelSet{2, 3}
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initResult, err := newLoopOutSwap(
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context.Background(), cfg, height, &req,
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)
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if err != nil {
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t.Fatal(err)
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}
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swap := initResult.swap
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// Execute the swap in its own goroutine.
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errChan := make(chan error)
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swapCtx, cancel := context.WithCancel(context.Background())
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go func() {
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err := swap.execute(swapCtx, &executeConfig{
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statusChan: statusChan,
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sweeper: sweeper,
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blockEpochChan: blockEpochChan,
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timerFactory: timerFactory,
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loopOutMaxParts: maxParts,
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}, height)
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if err != nil {
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log.Error(err)
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}
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errChan <- err
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}()
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store.assertLoopOutStored()
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state := <-statusChan
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if state.State != loopdb.StateInitiated {
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t.Fatal("unexpected state")
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}
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// Intercept the swap and prepay payments. Order is undefined.
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payments := []test.RouterPaymentChannelMessage{
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<-ctx.Lnd.RouterSendPaymentChannel,
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<-ctx.Lnd.RouterSendPaymentChannel,
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}
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// Find the swap payment.
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var swapPayment test.RouterPaymentChannelMessage
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for _, p := range payments {
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if p.Invoice == swap.SwapInvoice {
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swapPayment = p
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}
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}
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// Assert that it is sent as a multi-part payment.
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if swapPayment.MaxParts != maxParts {
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t.Fatalf("Expected %v parts, but got %v",
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maxParts, swapPayment.MaxParts)
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}
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// Verify the outgoing channel set restriction.
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if !reflect.DeepEqual(
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[]uint64(req.OutgoingChanSet), swapPayment.OutgoingChanIds,
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) {
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t.Fatalf("Unexpected outgoing channel set")
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}
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// Swap is expected to register for confirmation of the htlc. Assert
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// this to prevent a blocked channel in the mock.
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ctx.AssertRegisterConf(false, defaultConfirmations)
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// Cancel the swap. There is nothing else we need to assert. The payment
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// parameters don't play a role in the remainder of the swap process.
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cancel()
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// Expect the swap to signal that it was cancelled.
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err = <-errChan
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if err != context.Canceled {
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t.Fatal(err)
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}
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}
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// TestLateHtlcPublish tests that the client is not revealing the preimage if
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// there are not enough blocks left.
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func TestLateHtlcPublish(t *testing.T) {
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defer test.Guard(t)()
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lnd := test.NewMockLnd()
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ctx := test.NewContext(t, lnd)
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server := newServerMock(lnd)
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store := newStoreMock(t)
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expiryChan := make(chan time.Time)
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timerFactory := func(expiry time.Duration) <-chan time.Time {
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return expiryChan
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}
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height := int32(600)
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cfg := newSwapConfig(&lnd.LndServices, store, server)
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testRequest.Expiry = height + testLoopOutMinOnChainCltvDelta
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initResult, err := newLoopOutSwap(
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context.Background(), cfg, height, testRequest,
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)
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if err != nil {
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t.Fatal(err)
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}
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swap := initResult.swap
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sweeper := &sweep.Sweeper{Lnd: &lnd.LndServices}
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blockEpochChan := make(chan interface{})
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statusChan := make(chan SwapInfo)
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errChan := make(chan error)
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go func() {
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err := swap.execute(context.Background(), &executeConfig{
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statusChan: statusChan,
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sweeper: sweeper,
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blockEpochChan: blockEpochChan,
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timerFactory: timerFactory,
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}, height)
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if err != nil {
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log.Error(err)
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}
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errChan <- err
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}()
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store.assertLoopOutStored()
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state := <-statusChan
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if state.State != loopdb.StateInitiated {
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t.Fatal("unexpected state")
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}
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signalSwapPaymentResult := ctx.AssertPaid(swapInvoiceDesc)
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signalPrepaymentResult := ctx.AssertPaid(prepayInvoiceDesc)
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// Expect client to register for conf
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ctx.AssertRegisterConf(false, defaultConfirmations)
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// // Wait too long before publishing htlc.
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blockEpochChan <- int32(swap.CltvExpiry - 10)
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signalSwapPaymentResult(
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errors.New(lndclient.PaymentResultUnknownPaymentHash),
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)
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signalPrepaymentResult(
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errors.New(lndclient.PaymentResultUnknownPaymentHash),
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)
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store.assertStoreFinished(loopdb.StateFailTimeout)
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status := <-statusChan
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if status.State != loopdb.StateFailTimeout {
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t.Fatal("unexpected state")
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}
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err = <-errChan
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if err != nil {
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t.Fatal(err)
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}
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}
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// TestCustomSweepConfTarget ensures we are able to sweep a Loop Out HTLC with a
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// custom confirmation target.
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func TestCustomSweepConfTarget(t *testing.T) {
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defer test.Guard(t)()
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lnd := test.NewMockLnd()
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ctx := test.NewContext(t, lnd)
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server := newServerMock(lnd)
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// Use the highest sweep confirmation target before we attempt to use
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// the default.
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testReq := *testRequest
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testReq.SweepConfTarget = testLoopOutMinOnChainCltvDelta -
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DefaultSweepConfTargetDelta - 1
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// Set up custom fee estimates such that the lower confirmation target
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// yields a much higher fee rate.
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ctx.Lnd.SetFeeEstimate(testReq.SweepConfTarget, 250)
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ctx.Lnd.SetFeeEstimate(DefaultSweepConfTarget, 10000)
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cfg := newSwapConfig(
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&lnd.LndServices, newStoreMock(t), server,
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)
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initResult, err := newLoopOutSwap(
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context.Background(), cfg, ctx.Lnd.Height, &testReq,
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)
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if err != nil {
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t.Fatal(err)
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}
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swap := initResult.swap
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// Set up the required dependencies to execute the swap.
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//
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// TODO: create test context similar to loopInTestContext.
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sweeper := &sweep.Sweeper{Lnd: &lnd.LndServices}
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blockEpochChan := make(chan interface{})
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statusChan := make(chan SwapInfo)
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expiryChan := make(chan time.Time)
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timerFactory := func(expiry time.Duration) <-chan time.Time {
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return expiryChan
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}
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errChan := make(chan error)
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go func() {
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err := swap.execute(context.Background(), &executeConfig{
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statusChan: statusChan,
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blockEpochChan: blockEpochChan,
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timerFactory: timerFactory,
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sweeper: sweeper,
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}, ctx.Lnd.Height)
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if err != nil {
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log.Error(err)
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}
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errChan <- err
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}()
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// The swap should be found in its initial state.
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cfg.store.(*storeMock).assertLoopOutStored()
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state := <-statusChan
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if state.State != loopdb.StateInitiated {
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t.Fatal("unexpected state")
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}
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// We'll then pay both the swap and prepay invoice, which should trigger
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// the server to publish the on-chain HTLC.
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signalSwapPaymentResult := ctx.AssertPaid(swapInvoiceDesc)
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signalPrepaymentResult := ctx.AssertPaid(prepayInvoiceDesc)
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signalSwapPaymentResult(nil)
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signalPrepaymentResult(nil)
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// Notify the confirmation notification for the HTLC.
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ctx.AssertRegisterConf(false, defaultConfirmations)
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blockEpochChan <- ctx.Lnd.Height + 1
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htlcTx := wire.NewMsgTx(2)
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htlcTx.AddTxOut(&wire.TxOut{
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Value: int64(swap.AmountRequested),
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PkScript: swap.htlc.PkScript,
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})
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ctx.NotifyConf(htlcTx)
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// The client should then register for a spend of the HTLC and attempt
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// to sweep it using the custom confirmation target.
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ctx.AssertRegisterSpendNtfn(swap.htlc.PkScript)
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// Assert that we made a query to track our payment, as required for
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// preimage push tracking.
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trackPayment := ctx.AssertTrackPayment()
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expiryChan <- time.Now()
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// Expect a signing request for the HTLC success transaction.
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<-ctx.Lnd.SignOutputRawChannel
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cfg.store.(*storeMock).assertLoopOutState(loopdb.StatePreimageRevealed)
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status := <-statusChan
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if status.State != loopdb.StatePreimageRevealed {
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t.Fatalf("expected state %v, got %v",
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loopdb.StatePreimageRevealed, status.State)
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}
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// assertSweepTx performs some sanity checks on a sweep transaction to
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// ensure it was constructed correctly.
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assertSweepTx := func(expConfTarget int32) *wire.MsgTx {
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t.Helper()
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sweepTx := ctx.ReceiveTx()
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if sweepTx.TxIn[0].PreviousOutPoint.Hash != htlcTx.TxHash() {
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t.Fatalf("expected sweep tx to spend %v, got %v",
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htlcTx.TxHash(), sweepTx.TxIn[0].PreviousOutPoint)
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}
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// The fee used for the sweep transaction is an estimate based
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// on the maximum witness size, so we should expect to see a
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// lower fee when using the actual witness size of the
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// transaction.
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fee := btcutil.Amount(
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htlcTx.TxOut[0].Value - sweepTx.TxOut[0].Value,
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)
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weight := blockchain.GetTransactionWeight(btcutil.NewTx(sweepTx))
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feeRate, err := ctx.Lnd.WalletKit.EstimateFee(
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context.Background(), expConfTarget,
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)
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if err != nil {
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t.Fatalf("unable to retrieve fee estimate: %v", err)
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}
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minFee := feeRate.FeeForWeight(weight)
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maxFee := btcutil.Amount(float64(minFee) * 1.1)
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if fee < minFee && fee > maxFee {
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t.Fatalf("expected sweep tx to have fee between %v-%v, "+
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"got %v", minFee, maxFee, fee)
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}
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return sweepTx
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}
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// The sweep should have a fee that corresponds to the custom
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// confirmation target.
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_ = assertSweepTx(testReq.SweepConfTarget)
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// Once we have published an on chain sweep, we expect a preimage to
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// have been pushed to our server.
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preimage := <-server.preimagePush
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require.Equal(t, swap.Preimage, preimage)
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// Now that we have pushed our preimage to the sever, we send an update
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// indicating that our off chain htlc is settled. We do this so that
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// we don't have to keep consuming preimage pushes from our server mock
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// for every sweep attempt.
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trackPayment.Updates <- lndclient.PaymentStatus{
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State: lnrpc.Payment_SUCCEEDED,
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}
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// We'll then notify the height at which we begin using the default
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// confirmation target.
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defaultConfTargetHeight := ctx.Lnd.Height +
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testLoopOutMinOnChainCltvDelta - DefaultSweepConfTargetDelta
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blockEpochChan <- int32(defaultConfTargetHeight)
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expiryChan <- time.Now()
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// Expect another signing request.
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<-ctx.Lnd.SignOutputRawChannel
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// We should expect to see another sweep using the higher fee since the
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// spend hasn't been confirmed yet.
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sweepTx := assertSweepTx(DefaultSweepConfTarget)
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// Notify the spend so that the swap reaches its final state.
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ctx.NotifySpend(sweepTx, 0)
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cfg.store.(*storeMock).assertLoopOutState(loopdb.StateSuccess)
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status = <-statusChan
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if status.State != loopdb.StateSuccess {
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t.Fatalf("expected state %v, got %v", loopdb.StateSuccess,
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status.State)
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}
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if err := <-errChan; err != nil {
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t.Fatal(err)
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}
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}
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// TestPreimagePush tests or logic that decides whether to push our preimage to
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// the server. First, we test the case where we have not yet disclosed our
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// preimage with a sweep, so we do not want to push our preimage yet. Next, we
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// broadcast a sweep attempt and push our preimage to the server. In this stage
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// we mock a server failure by not sending a settle update for our payment.
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// Finally, we make a last sweep attempt, push the preimage (because we have
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// not detected our settle) and settle the off chain htlc, indicating that the
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// server successfully settled using the preimage push. In this test, we need
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// to start with a fee rate that will be too high, then progress to an
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// acceptable one. We do this by starting with a high confirmation target with
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// a high fee, and setting the default confirmation fee (which our swap will
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// drop down to if it is not confirming in time) to a lower fee. This is not
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// intuitive (lower confs having lower fees), but it allows up to mock fee
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// changes.
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func TestPreimagePush(t *testing.T) {
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defer test.Guard(t)()
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lnd := test.NewMockLnd()
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ctx := test.NewContext(t, lnd)
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server := newServerMock(lnd)
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// Start with a high confirmation delta which will have a very high fee
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// attached to it.
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testReq := *testRequest
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testReq.SweepConfTarget = testLoopOutMinOnChainCltvDelta -
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DefaultSweepConfTargetDelta - 1
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testReq.Expiry = ctx.Lnd.Height + testLoopOutMinOnChainCltvDelta
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// We set our mock fee estimate for our target sweep confs to be our
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// max miner fee *2, so that our fee will definitely be above what we
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// are willing to pay, and we will not sweep.
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ctx.Lnd.SetFeeEstimate(
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testReq.SweepConfTarget, chainfee.SatPerKWeight(
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testReq.MaxMinerFee*2,
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),
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)
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// We set the fee estimate for our default confirmation target very
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// low, so that once we drop down to our default confs we will start
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// trying to sweep the preimage.
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ctx.Lnd.SetFeeEstimate(DefaultSweepConfTarget, 1)
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cfg := newSwapConfig(
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&lnd.LndServices, newStoreMock(t), server,
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)
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initResult, err := newLoopOutSwap(
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context.Background(), cfg, ctx.Lnd.Height, &testReq,
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)
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require.NoError(t, err)
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swap := initResult.swap
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// Set up the required dependencies to execute the swap.
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sweeper := &sweep.Sweeper{Lnd: &lnd.LndServices}
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blockEpochChan := make(chan interface{})
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statusChan := make(chan SwapInfo)
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expiryChan := make(chan time.Time)
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timerFactory := func(_ time.Duration) <-chan time.Time {
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return expiryChan
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}
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errChan := make(chan error)
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go func() {
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err := swap.execute(context.Background(), &executeConfig{
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statusChan: statusChan,
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blockEpochChan: blockEpochChan,
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timerFactory: timerFactory,
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sweeper: sweeper,
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}, ctx.Lnd.Height)
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if err != nil {
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log.Error(err)
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}
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errChan <- err
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}()
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// The swap should be found in its initial state.
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cfg.store.(*storeMock).assertLoopOutStored()
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state := <-statusChan
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require.Equal(t, loopdb.StateInitiated, state.State)
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// We'll then pay both the swap and prepay invoice, which should trigger
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// the server to publish the on-chain HTLC.
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signalSwapPaymentResult := ctx.AssertPaid(swapInvoiceDesc)
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signalPrepaymentResult := ctx.AssertPaid(prepayInvoiceDesc)
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signalSwapPaymentResult(nil)
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signalPrepaymentResult(nil)
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// Notify the confirmation notification for the HTLC.
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ctx.AssertRegisterConf(false, defaultConfirmations)
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blockEpochChan <- ctx.Lnd.Height + 1
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htlcTx := wire.NewMsgTx(2)
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htlcTx.AddTxOut(&wire.TxOut{
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Value: int64(swap.AmountRequested),
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PkScript: swap.htlc.PkScript,
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})
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ctx.NotifyConf(htlcTx)
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// The client should then register for a spend of the HTLC and attempt
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// to sweep it using the custom confirmation target.
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ctx.AssertRegisterSpendNtfn(swap.htlc.PkScript)
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// Assert that we made a query to track our payment, as required for
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// preimage push tracking.
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trackPayment := ctx.AssertTrackPayment()
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// Tick the expiry channel, we are still using our client confirmation
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// target at this stage which has fees higher than our max acceptable
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// fee. We do not expect a sweep attempt at this point. Since our
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// preimage is not revealed, we also do not expect a preimage push.
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expiryChan <- testTime
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// Now, we notify the height at which the client will start using the
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// default confirmation target. This has the effect of lowering our fees
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// so that the client still start sweeping.
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defaultConfTargetHeight := ctx.Lnd.Height + testLoopOutMinOnChainCltvDelta -
|
|
DefaultSweepConfTargetDelta
|
|
blockEpochChan <- defaultConfTargetHeight
|
|
|
|
// This time when we tick the expiry chan, our fees are lower than the
|
|
// swap max, so we expect it to prompt a sweep.
|
|
expiryChan <- testTime
|
|
|
|
// Expect a signing request for the HTLC success transaction.
|
|
<-ctx.Lnd.SignOutputRawChannel
|
|
|
|
// This is the first time we have swept, so we expect our preimage
|
|
// revealed state to be set.
|
|
cfg.store.(*storeMock).assertLoopOutState(loopdb.StatePreimageRevealed)
|
|
status := <-statusChan
|
|
require.Equal(
|
|
t, status.State, loopdb.StatePreimageRevealed,
|
|
)
|
|
|
|
// We expect the sweep tx to have been published.
|
|
ctx.ReceiveTx()
|
|
|
|
// Once we have published an on chain sweep, we expect a preimage to
|
|
// have been pushed to the server after the sweep.
|
|
preimage := <-server.preimagePush
|
|
require.Equal(t, swap.Preimage, preimage)
|
|
|
|
// To mock a server failure, we do not send a payment settled update
|
|
// for our off chain payment yet. We also do not confirm our sweep on
|
|
// chain yet so we can test our preimage push retry logic. Instead, we
|
|
// tick the expiry chan again to prompt another sweep.
|
|
expiryChan <- testTime
|
|
|
|
// We expect another signing request for out sweep, and publish of our
|
|
// sweep transaction.
|
|
<-ctx.Lnd.SignOutputRawChannel
|
|
ctx.ReceiveTx()
|
|
|
|
// Since we have not yet been notified of an off chain settle, and we
|
|
// have attempted to sweep again, we expect another preimage push
|
|
// attempt.
|
|
preimage = <-server.preimagePush
|
|
require.Equal(t, swap.Preimage, preimage)
|
|
|
|
// This time, we send a payment succeeded update into our payment stream
|
|
// to reflect that the server received our preimage push and settled off
|
|
// chain.
|
|
trackPayment.Updates <- lndclient.PaymentStatus{
|
|
State: lnrpc.Payment_SUCCEEDED,
|
|
}
|
|
|
|
// We tick one last time, this time expecting a sweep but no preimage
|
|
// push. The test's mocked preimage channel is un-buffered, so our test
|
|
// would hang if we pushed the preimage here.
|
|
expiryChan <- testTime
|
|
<-ctx.Lnd.SignOutputRawChannel
|
|
sweepTx := ctx.ReceiveTx()
|
|
|
|
// Finally, we put this swap out of its misery and notify a successful
|
|
// spend our our sweepTx and assert that the swap succeeds.
|
|
ctx.NotifySpend(sweepTx, 0)
|
|
|
|
cfg.store.(*storeMock).assertLoopOutState(loopdb.StateSuccess)
|
|
status = <-statusChan
|
|
require.Equal(
|
|
t, status.State, loopdb.StateSuccess,
|
|
)
|
|
|
|
require.NoError(t, <-errChan)
|
|
}
|