package contractcourt import ( "fmt" "testing" "github.com/btcsuite/btcd/wire" "github.com/lightningnetwork/lnd/chainntnfs" "github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/channeldb/kvdb" "github.com/lightningnetwork/lnd/input" "github.com/lightningnetwork/lnd/lntest/mock" "github.com/lightningnetwork/lnd/lntypes" "github.com/lightningnetwork/lnd/lnwallet" "github.com/lightningnetwork/lnd/lnwire" ) const ( outgoingContestHtlcExpiry = 110 ) // TestHtlcOutgoingResolverTimeout tests resolution of an offered htlc that // timed out. func TestHtlcOutgoingResolverTimeout(t *testing.T) { t.Parallel() defer timeout(t)() // Setup the resolver with our test resolution. ctx := newOutgoingResolverTestContext(t) // Start the resolution process in a goroutine. ctx.resolve() // Notify arrival of the block after which the timeout path of the htlc // unlocks. ctx.notifyEpoch(outgoingContestHtlcExpiry - 1) // Assert that the resolver finishes without error and transforms in a // timeout resolver. ctx.waitForResult(true) } // TestHtlcOutgoingResolverRemoteClaim tests resolution of an offered htlc that // is claimed by the remote party. func TestHtlcOutgoingResolverRemoteClaim(t *testing.T) { t.Parallel() defer timeout(t)() // Setup the resolver with our test resolution and start the resolution // process. ctx := newOutgoingResolverTestContext(t) // Replace our mocked checkpoint function with one which will push // reports into a channel for us to consume. We do so on the resolver // level because our test context has already created the resolver. reportChan := make(chan *channeldb.ResolverReport) ctx.resolver.Checkpoint = func(_ ContractResolver, reports ...*channeldb.ResolverReport) error { // Send all of our reports into the channel. for _, report := range reports { reportChan <- report } return nil } ctx.resolve() // The remote party sweeps the htlc. Notify our resolver of this event. preimage := lntypes.Preimage{} spendTx := &wire.MsgTx{ TxIn: []*wire.TxIn{ { Witness: [][]byte{ {0}, {1}, {2}, preimage[:], }, }, }, } spendHash := spendTx.TxHash() ctx.notifier.SpendChan <- &chainntnfs.SpendDetail{ SpendingTx: spendTx, SpenderTxHash: &spendHash, } // We expect the extracted preimage to be added to the witness beacon. <-ctx.preimageDB.newPreimages // We also expect a resolution message to the incoming side of the // circuit. <-ctx.resolutionChan // Finally, check that we have a report as expected. expectedReport := &channeldb.ResolverReport{ OutPoint: wire.OutPoint{}, Amount: 0, ResolverType: channeldb.ResolverTypeOutgoingHtlc, ResolverOutcome: channeldb.ResolverOutcomeClaimed, SpendTxID: &spendHash, } assertResolverReport(t, reportChan, expectedReport) // Assert that the resolver finishes without error. ctx.waitForResult(false) } type resolveResult struct { err error nextResolver ContractResolver } type outgoingResolverTestContext struct { resolver *htlcOutgoingContestResolver notifier *mock.ChainNotifier preimageDB *mockWitnessBeacon resolverResultChan chan resolveResult resolutionChan chan ResolutionMsg t *testing.T } func newOutgoingResolverTestContext(t *testing.T) *outgoingResolverTestContext { notifier := &mock.ChainNotifier{ EpochChan: make(chan *chainntnfs.BlockEpoch), SpendChan: make(chan *chainntnfs.SpendDetail), ConfChan: make(chan *chainntnfs.TxConfirmation), } checkPointChan := make(chan struct{}, 1) resolutionChan := make(chan ResolutionMsg, 1) preimageDB := newMockWitnessBeacon() onionProcessor := &mockOnionProcessor{} chainCfg := ChannelArbitratorConfig{ ChainArbitratorConfig: ChainArbitratorConfig{ Notifier: notifier, PreimageDB: preimageDB, DeliverResolutionMsg: func(msgs ...ResolutionMsg) error { if len(msgs) != 1 { return fmt.Errorf("expected 1 "+ "resolution msg, instead got %v", len(msgs)) } resolutionChan <- msgs[0] return nil }, OnionProcessor: onionProcessor, }, PutResolverReport: func(_ kvdb.RwTx, _ *channeldb.ResolverReport) error { return nil }, } outgoingRes := lnwallet.OutgoingHtlcResolution{ Expiry: outgoingContestHtlcExpiry, SweepSignDesc: input.SignDescriptor{ Output: &wire.TxOut{}, }, } cfg := ResolverConfig{ ChannelArbitratorConfig: chainCfg, Checkpoint: func(_ ContractResolver, _ ...*channeldb.ResolverReport) error { checkPointChan <- struct{}{} return nil }, } resolver := &htlcOutgoingContestResolver{ htlcTimeoutResolver: htlcTimeoutResolver{ contractResolverKit: *newContractResolverKit(cfg), htlcResolution: outgoingRes, htlc: channeldb.HTLC{ Amt: lnwire.MilliSatoshi(testHtlcAmount), RHash: testResHash, OnionBlob: testOnionBlob, }, }, } return &outgoingResolverTestContext{ resolver: resolver, notifier: notifier, preimageDB: preimageDB, resolutionChan: resolutionChan, t: t, } } func (i *outgoingResolverTestContext) resolve() { // Start resolver. i.resolverResultChan = make(chan resolveResult, 1) go func() { nextResolver, err := i.resolver.Resolve() i.resolverResultChan <- resolveResult{ nextResolver: nextResolver, err: err, } }() // Notify initial block height. i.notifyEpoch(testInitialBlockHeight) } func (i *outgoingResolverTestContext) notifyEpoch(height int32) { i.notifier.EpochChan <- &chainntnfs.BlockEpoch{ Height: height, } } func (i *outgoingResolverTestContext) waitForResult(expectTimeoutRes bool) { i.t.Helper() result := <-i.resolverResultChan if result.err != nil { i.t.Fatal(result.err) } if !expectTimeoutRes { if result.nextResolver != nil { i.t.Fatal("expected no next resolver") } return } _, ok := result.nextResolver.(*htlcTimeoutResolver) if !ok { i.t.Fatal("expected htlcTimeoutResolver") } }