lnd.xprv/contractcourt/htlc_outgoing_contest_resolver_test.go

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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")
}
}