lnd.xprv/contractcourt/commit_sweep_resolver_test.go

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package contractcourt
import (
"testing"
"time"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"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/lnwallet"
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
"github.com/lightningnetwork/lnd/sweep"
)
type commitSweepResolverTestContext struct {
resolver *commitSweepResolver
notifier *mock.ChainNotifier
sweeper *mockSweeper
resolverResultChan chan resolveResult
t *testing.T
}
func newCommitSweepResolverTestContext(t *testing.T,
resolution *lnwallet.CommitOutputResolution) *commitSweepResolverTestContext {
notifier := &mock.ChainNotifier{
EpochChan: make(chan *chainntnfs.BlockEpoch),
SpendChan: make(chan *chainntnfs.SpendDetail),
ConfChan: make(chan *chainntnfs.TxConfirmation),
}
sweeper := newMockSweeper()
checkPointChan := make(chan struct{}, 1)
chainCfg := ChannelArbitratorConfig{
ChainArbitratorConfig: ChainArbitratorConfig{
Notifier: notifier,
Sweeper: sweeper,
},
PutResolverReport: func(_ kvdb.RwTx,
_ *channeldb.ResolverReport) error {
return nil
},
}
cfg := ResolverConfig{
ChannelArbitratorConfig: chainCfg,
Checkpoint: func(_ ContractResolver,
_ ...*channeldb.ResolverReport) error {
checkPointChan <- struct{}{}
return nil
},
}
resolver := newCommitSweepResolver(
*resolution, 0, wire.OutPoint{}, cfg,
)
return &commitSweepResolverTestContext{
resolver: resolver,
notifier: notifier,
sweeper: sweeper,
t: t,
}
}
func (i *commitSweepResolverTestContext) resolve() {
// Start resolver.
i.resolverResultChan = make(chan resolveResult, 1)
go func() {
nextResolver, err := i.resolver.Resolve()
i.resolverResultChan <- resolveResult{
nextResolver: nextResolver,
err: err,
}
}()
}
func (i *commitSweepResolverTestContext) notifyEpoch(height int32) {
i.notifier.EpochChan <- &chainntnfs.BlockEpoch{
Height: height,
}
}
func (i *commitSweepResolverTestContext) waitForResult() {
i.t.Helper()
result := <-i.resolverResultChan
if result.err != nil {
i.t.Fatal(result.err)
}
if result.nextResolver != nil {
i.t.Fatal("expected no next resolver")
}
}
type mockSweeper struct {
sweptInputs chan input.Input
updatedInputs chan wire.OutPoint
sweepTx *wire.MsgTx
sweepErr error
createSweepTxChan chan *wire.MsgTx
}
func newMockSweeper() *mockSweeper {
return &mockSweeper{
sweptInputs: make(chan input.Input),
updatedInputs: make(chan wire.OutPoint),
sweepTx: &wire.MsgTx{},
createSweepTxChan: make(chan *wire.MsgTx),
}
}
func (s *mockSweeper) SweepInput(input input.Input, params sweep.Params) (
chan sweep.Result, error) {
s.sweptInputs <- input
result := make(chan sweep.Result, 1)
result <- sweep.Result{
Tx: s.sweepTx,
Err: s.sweepErr,
}
return result, nil
}
func (s *mockSweeper) CreateSweepTx(inputs []input.Input, feePref sweep.FeePreference,
currentBlockHeight uint32) (*wire.MsgTx, error) {
// We will wait for the test to supply the sweep tx to return.
sweepTx := <-s.createSweepTxChan
return sweepTx, nil
}
func (s *mockSweeper) RelayFeePerKW() chainfee.SatPerKWeight {
return 253
}
func (s *mockSweeper) UpdateParams(input wire.OutPoint,
params sweep.ParamsUpdate) (chan sweep.Result, error) {
s.updatedInputs <- input
result := make(chan sweep.Result, 1)
result <- sweep.Result{
Tx: s.sweepTx,
}
return result, nil
}
var _ UtxoSweeper = &mockSweeper{}
// TestCommitSweepResolverNoDelay tests resolution of a direct commitment output
// unencumbered by a time lock.
func TestCommitSweepResolverNoDelay(t *testing.T) {
t.Parallel()
defer timeout(t)()
res := lnwallet.CommitOutputResolution{
SelfOutputSignDesc: input.SignDescriptor{
Output: &wire.TxOut{
Value: 100,
},
WitnessScript: []byte{0},
},
}
ctx := newCommitSweepResolverTestContext(t, &res)
// Replace our checkpoint with one which will push reports into a
// channel for us to consume. We replace this function on the resolver
// itself because it is created by the test context.
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()
spendTx := &wire.MsgTx{}
spendHash := spendTx.TxHash()
ctx.notifier.ConfChan <- &chainntnfs.TxConfirmation{
Tx: spendTx,
}
// No csv delay, so the input should be swept immediately.
<-ctx.sweeper.sweptInputs
amt := btcutil.Amount(res.SelfOutputSignDesc.Output.Value)
expectedReport := &channeldb.ResolverReport{
OutPoint: wire.OutPoint{},
Amount: amt,
ResolverType: channeldb.ResolverTypeCommit,
ResolverOutcome: channeldb.ResolverOutcomeClaimed,
SpendTxID: &spendHash,
}
assertResolverReport(t, reportChan, expectedReport)
ctx.waitForResult()
}
// testCommitSweepResolverDelay tests resolution of a direct commitment output
// that is encumbered by a time lock. sweepErr indicates whether the local node
// fails to sweep the output.
func testCommitSweepResolverDelay(t *testing.T, sweepErr error) {
defer timeout(t)()
const sweepProcessInterval = 100 * time.Millisecond
amt := int64(100)
outpoint := wire.OutPoint{
Index: 5,
}
res := lnwallet.CommitOutputResolution{
SelfOutputSignDesc: input.SignDescriptor{
Output: &wire.TxOut{
Value: amt,
},
WitnessScript: []byte{0},
},
MaturityDelay: 3,
SelfOutPoint: outpoint,
}
ctx := newCommitSweepResolverTestContext(t, &res)
// Replace our checkpoint with one which will push reports into a
// channel for us to consume. We replace this function on the resolver
// itself because it is created by the test context.
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
}
// Setup whether we expect the sweeper to receive a sweep error in this
// test case.
ctx.sweeper.sweepErr = sweepErr
report := ctx.resolver.report()
expectedReport := ContractReport{
Outpoint: outpoint,
Type: ReportOutputUnencumbered,
Amount: btcutil.Amount(amt),
LimboBalance: btcutil.Amount(amt),
}
if *report != expectedReport {
t.Fatalf("unexpected resolver report. want=%v got=%v",
expectedReport, report)
}
ctx.resolve()
ctx.notifier.ConfChan <- &chainntnfs.TxConfirmation{
BlockHeight: testInitialBlockHeight - 1,
}
// Allow resolver to process confirmation.
time.Sleep(sweepProcessInterval)
// Expect report to be updated.
report = ctx.resolver.report()
if report.MaturityHeight != testInitialBlockHeight+2 {
t.Fatal("report maturity height incorrect")
}
// Notify initial block height. The csv lock is still in effect, so we
// don't expect any sweep to happen yet.
ctx.notifyEpoch(testInitialBlockHeight)
select {
case <-ctx.sweeper.sweptInputs:
t.Fatal("no sweep expected")
case <-time.After(sweepProcessInterval):
}
// A new block arrives. The commit tx confirmed at height -1 and the csv
// is 3, so a spend will be valid in the first block after height +1.
ctx.notifyEpoch(testInitialBlockHeight + 1)
<-ctx.sweeper.sweptInputs
// Set the resolution report outcome based on whether our sweep
// succeeded.
outcome := channeldb.ResolverOutcomeClaimed
if sweepErr != nil {
outcome = channeldb.ResolverOutcomeUnclaimed
}
sweepTx := ctx.sweeper.sweepTx.TxHash()
assertResolverReport(t, reportChan, &channeldb.ResolverReport{
OutPoint: outpoint,
ResolverType: channeldb.ResolverTypeCommit,
ResolverOutcome: outcome,
Amount: btcutil.Amount(amt),
SpendTxID: &sweepTx,
})
ctx.waitForResult()
// If this test case generates a sweep error, we don't expect to be
// able to recover anything. This might happen if the local commitment
// output was swept by a justice transaction by the remote party.
expectedRecoveredBalance := btcutil.Amount(amt)
if sweepErr != nil {
expectedRecoveredBalance = 0
}
report = ctx.resolver.report()
expectedReport = ContractReport{
Outpoint: outpoint,
Type: ReportOutputUnencumbered,
Amount: btcutil.Amount(amt),
MaturityHeight: testInitialBlockHeight + 2,
RecoveredBalance: expectedRecoveredBalance,
}
if *report != expectedReport {
t.Fatalf("unexpected resolver report. want=%v got=%v",
expectedReport, report)
}
}
// TestCommitSweepResolverDelay tests resolution of a direct commitment output
// that is encumbered by a time lock.
func TestCommitSweepResolverDelay(t *testing.T) {
t.Parallel()
testCases := []struct {
name string
sweepErr error
}{{
name: "success",
sweepErr: nil,
}, {
name: "remote spend",
sweepErr: sweep.ErrRemoteSpend,
}}
for _, tc := range testCases {
tc := tc
ok := t.Run(tc.name, func(t *testing.T) {
testCommitSweepResolverDelay(t, tc.sweepErr)
})
if !ok {
break
}
}
}