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Merge pull request #1943 from joostjager/nursery-test

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utxonursery: add test coverage
This commit is contained in:
Olaoluwa Osuntokun 2018-09-27 20:16:19 -07:00 committed by GitHub
commit a9398ac01c
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 774 additions and 11 deletions
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4
Makefile
View File

@ -175,8 +175,8 @@ flakehunter: build
flake-unit:
@$(call print, "Flake hunting unit tests.")
$(UNIT) -count=1
while [ $$? -eq 0 ]; do /bin/sh -c "$(UNIT) -count=1"; done
GOTRACEBACK=all $(UNIT) -count=1
while [ $$? -eq 0 ]; do /bin/sh -c "GOTRACEBACK=all $(UNIT) -count=1"; done
# ======
# TRAVIS

9
server.go
View File

@ -582,10 +582,11 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB, cc *chainControl,
}
s.utxoNursery = newUtxoNursery(&NurseryConfig{
ChainIO: cc.chainIO,
ConfDepth: 1,
DB: chanDB,
Estimator: cc.feeEstimator,
ChainIO: cc.chainIO,
ConfDepth: 1,
FetchClosedChannels: chanDB.FetchClosedChannels,
FetchClosedChannel: chanDB.FetchClosedChannel,
Estimator: cc.feeEstimator,
GenSweepScript: func() ([]byte, error) {
return newSweepPkScript(cc.wallet)
},

31
utxonursery.go
View File

@ -181,9 +181,15 @@ type NurseryConfig struct {
// determining outputs in the chain as confirmed.
ConfDepth uint32
// DB provides access to a user's channels, such that they can be marked
// fully closed after incubation has concluded.
DB *channeldb.DB
// FetchClosedChannels provides access to a user's channels, such that
// they can be marked fully closed after incubation has concluded.
FetchClosedChannels func(pendingOnly bool) (
[]*channeldb.ChannelCloseSummary, error)
// FetchClosedChannel provides access to the close summary to extract a
// height hint from.
FetchClosedChannel func(chanID *wire.OutPoint) (
*channeldb.ChannelCloseSummary, error)
// Estimator is used when crafting sweep transactions to estimate the
// necessary fee relative to the expected size of the sweep transaction.
@ -266,7 +272,7 @@ func (u *utxoNursery) Start() error {
// Load any pending close channels, which represents the super set of
// all channels that may still be incubating.
pendingCloseChans, err := u.cfg.DB.FetchClosedChannels(true)
pendingCloseChans, err := u.cfg.FetchClosedChannels(true)
if err != nil {
newBlockChan.Cancel()
return err
@ -346,6 +352,21 @@ func (u *utxoNursery) IncubateOutputs(chanPoint wire.OutPoint,
incomingHtlcs []lnwallet.IncomingHtlcResolution,
broadcastHeight uint32) error {
// Add to wait group because nursery might shut down during execution of
// this function. Otherwise it could happen that nursery thinks it is
// shut down, but in this function new goroutines were started and stay
// around.
u.wg.Add(1)
defer u.wg.Done()
// Check quit channel for the case where the waitgroup wait was finished
// right before this function's add call was made.
select {
case <-u.quit:
return fmt.Errorf("nursery shutting down")
default:
}
numHtlcs := len(incomingHtlcs) + len(outgoingHtlcs)
var (
hasCommit bool
@ -624,7 +645,7 @@ func (u *utxoNursery) reloadPreschool() error {
chanPoint := kid.OriginChanPoint()
// Load the close summary for this output's channel point.
closeSummary, err := u.cfg.DB.FetchClosedChannel(chanPoint)
closeSummary, err := u.cfg.FetchClosedChannel(chanPoint)
if err == channeldb.ErrClosedChannelNotFound {
// This should never happen since the close summary
// should only be removed after the channel has been

741
utxonursery_test.go
View File

@ -5,14 +5,20 @@ package main
import (
"bytes"
"fmt"
"github.com/lightningnetwork/lnd/channeldb"
"io/ioutil"
"math"
"reflect"
"sync"
"testing"
"time"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/lnwallet"
)
@ -309,6 +315,9 @@ var (
},
},
}
testChanPoint = wire.OutPoint{}
defaultTestTimeout = 5 * time.Second
)
func init() {
@ -383,3 +392,735 @@ func TestBabyOutputSerialization(t *testing.T) {
}
}
type nurseryTestContext struct {
nursery *utxoNursery
notifier *nurseryMockNotifier
publishChan chan wire.MsgTx
store *nurseryStoreInterceptor
restart func() bool
receiveTx func() wire.MsgTx
t *testing.T
}
func createNurseryTestContext(t *testing.T,
checkStartStop func(func()) bool) *nurseryTestContext {
// Create a temporary database and connect nurseryStore to it. The
// alternative, mocking nurseryStore, is not chosen because there is
// still considerable logic in the store.
tempDirName, err := ioutil.TempDir("", "channeldb")
if err != nil {
t.Fatalf("unable to create temp dir: %v", err)
}
cdb, err := channeldb.Open(tempDirName)
if err != nil {
t.Fatalf("unable to open channeldb: %v", err)
}
store, err := newNurseryStore(&chainhash.Hash{}, cdb)
if err != nil {
t.Fatal(err)
}
// Wrap the store in an inceptor to be able to wait for events in this
// test.
storeIntercepter := newNurseryStoreInterceptor(store)
notifier := newNurseryMockNotifier(t)
cfg := NurseryConfig{
Notifier: notifier,
FetchClosedChannels: func(pendingOnly bool) (
[]*channeldb.ChannelCloseSummary, error) {
return []*channeldb.ChannelCloseSummary{}, nil
},
FetchClosedChannel: func(chanID *wire.OutPoint) (
*channeldb.ChannelCloseSummary, error) {
return &channeldb.ChannelCloseSummary{
CloseHeight: 0,
}, nil
},
Store: storeIntercepter,
ChainIO: &mockChainIO{},
GenSweepScript: func() ([]byte, error) {
return []byte{}, nil
},
Estimator: &mockFeeEstimator{},
Signer: &nurseryMockSigner{},
}
publishChan := make(chan wire.MsgTx, 1)
cfg.PublishTransaction = func(tx *wire.MsgTx) error {
t.Logf("Publishing tx %v", tx.TxHash())
publishChan <- *tx
return nil
}
nursery := newUtxoNursery(&cfg)
nursery.Start()
ctx := &nurseryTestContext{
nursery: nursery,
notifier: notifier,
store: storeIntercepter,
publishChan: publishChan,
t: t,
}
ctx.restart = func() bool {
return checkStartStop(func() {
ctx.nursery.Stop()
// Simulate lnd restart.
ctx.nursery = newUtxoNursery(ctx.nursery.cfg)
ctx.nursery.Start()
})
}
ctx.receiveTx = func() wire.MsgTx {
var tx wire.MsgTx
select {
case tx = <-ctx.publishChan:
return tx
case <-time.After(5 * time.Second):
t.Fatalf("tx not published")
}
return tx
}
// Start with testing an immediate restart.
ctx.restart()
return ctx
}
func (ctx *nurseryTestContext) finish() {
// Add a final restart point in this state
ctx.restart()
// We assume that when finish is called, nursery has finished all its
// goroutines. This implies that the waitgroup is empty.
signalChan := make(chan struct{})
go func() {
ctx.nursery.wg.Wait()
close(signalChan)
}()
// The only goroutine that is still expected to be running is
// incubator(). Simulate exit of this goroutine.
ctx.nursery.wg.Done()
// We now expect the Wait to succeed.
select {
case <-signalChan:
case <-time.After(time.Second):
ctx.t.Fatalf("lingering goroutines detected after test " +
"is finished")
}
// Restore waitgroup state to what it was before.
ctx.nursery.wg.Add(1)
ctx.nursery.Stop()
// We should have consumed and asserted all published transactions in
// our unit tests.
select {
case <-ctx.publishChan:
ctx.t.Fatalf("unexpected transactions published")
default:
}
// Assert that the database is empty. All channels removed and height
// index cleared.
nurseryChannels, err := ctx.nursery.cfg.Store.ListChannels()
if err != nil {
ctx.t.Fatal(err)
}
if len(nurseryChannels) > 0 {
ctx.t.Fatalf("Expected all channels to be removed from store")
}
activeHeights, err := ctx.nursery.cfg.Store.HeightsBelowOrEqual(
math.MaxUint32)
if err != nil {
ctx.t.Fatal(err)
}
if len(activeHeights) > 0 {
ctx.t.Fatalf("Expected height index to be empty")
}
}
func createOutgoingRes(onLocalCommitment bool) *lnwallet.OutgoingHtlcResolution {
// Set up an outgoing htlc resolution to hand off to nursery.
closeTx := &wire.MsgTx{}
htlcOp := wire.OutPoint{
Hash: closeTx.TxHash(),
Index: 0,
}
outgoingRes := lnwallet.OutgoingHtlcResolution{
Expiry: 125,
SweepSignDesc: lnwallet.SignDescriptor{
Output: &wire.TxOut{
Value: 10000,
},
},
CsvDelay: 2,
}
if onLocalCommitment {
timeoutTx := &wire.MsgTx{
TxIn: []*wire.TxIn{
{
PreviousOutPoint: htlcOp,
Witness: [][]byte{{}},
},
},
TxOut: []*wire.TxOut{
{},
},
}
outgoingRes.SignedTimeoutTx = timeoutTx
} else {
outgoingRes.ClaimOutpoint = htlcOp
}
return &outgoingRes
}
func createCommitmentRes() *lnwallet.CommitOutputResolution {
// Set up a commitment output resolution to hand off to nursery.
commitRes := lnwallet.CommitOutputResolution{
SelfOutPoint: wire.OutPoint{},
SelfOutputSignDesc: lnwallet.SignDescriptor{
Output: &wire.TxOut{
Value: 10000,
},
},
MaturityDelay: 2,
}
return &commitRes
}
func incubateTestOutput(t *testing.T, nursery *utxoNursery,
onLocalCommitment bool) *lnwallet.OutgoingHtlcResolution {
outgoingRes := createOutgoingRes(onLocalCommitment)
// Hand off to nursery.
err := nursery.IncubateOutputs(
testChanPoint,
nil,
[]lnwallet.OutgoingHtlcResolution{*outgoingRes},
nil, 0,
)
if err != nil {
t.Fatal(err)
}
// IncubateOutputs is executing synchronously and we expect the output
// to immediately show up in the report.
expectedStage := uint32(2)
if onLocalCommitment {
expectedStage = 1
}
// TODO(joostjager): Nursery is currently not reporting this limbo
// balance.
if onLocalCommitment {
assertNurseryReport(t, nursery, 1, expectedStage, 10000)
}
return outgoingRes
}
func assertNurseryReport(t *testing.T, nursery *utxoNursery,
expectedNofHtlcs int, expectedStage uint32,
expectedLimboBalance btcutil.Amount) {
report, err := nursery.NurseryReport(&testChanPoint)
if err != nil {
t.Fatal(err)
}
if len(report.htlcs) != expectedNofHtlcs {
t.Fatalf("expected %v outputs to be reported, but report "+
"only contains %v", expectedNofHtlcs, len(report.htlcs))
}
if expectedNofHtlcs != 0 {
htlcReport := report.htlcs[0]
if htlcReport.stage != expectedStage {
t.Fatalf("expected htlc be advanced to stage %v, but "+
"it is reported in stage %v",
expectedStage, htlcReport.stage)
}
}
if report.limboBalance != expectedLimboBalance {
t.Fatalf("expected limbo balance to be %v, but it is %v instead",
expectedLimboBalance, report.limboBalance)
}
}
func assertNurseryReportUnavailable(t *testing.T, nursery *utxoNursery) {
_, err := nursery.NurseryReport(&testChanPoint)
if err != ErrContractNotFound {
t.Fatal("expected report to be unavailable")
}
}
// testRestartLoop runs the specified test multiple times and in every run it
// will attempt to execute a restart action in a different location. This is to
// assert that the unit under test is recovering correctly from restarts.
func testRestartLoop(t *testing.T, test func(*testing.T,
func(func()) bool)) {
// Start with running the test without any restarts (index zero)
restartIdx := 0
for {
currentStartStopIdx := 0
// checkStartStop is called at every point in the test where a
// restart should be exercised. When this function is called as
// many times as the current value of currentStartStopIdx, it
// will execute startStopFunc.
checkStartStop := func(startStopFunc func()) bool {
currentStartStopIdx++
if restartIdx == currentStartStopIdx {
startStopFunc()
return true
}
return false
}
var subTestName string
if restartIdx == 0 {
subTestName = "no_restart"
} else {
subTestName = fmt.Sprintf("restart_%v", restartIdx)
}
t.Run(subTestName,
func(t *testing.T) {
test(t, checkStartStop)
})
// Exit the loop when all restart points have been tested.
if currentStartStopIdx == restartIdx {
return
}
restartIdx++
}
}
func TestNurseryOutgoingHtlcSuccessOnLocal(t *testing.T) {
testRestartLoop(t, testNurseryOutgoingHtlcSuccessOnLocal)
}
func testNurseryOutgoingHtlcSuccessOnLocal(t *testing.T,
checkStartStop func(func()) bool) {
ctx := createNurseryTestContext(t, checkStartStop)
outgoingRes := incubateTestOutput(t, ctx.nursery, true)
ctx.restart()
// Notify arrival of block where HTLC CLTV expires.
ctx.notifier.notifyEpoch(125)
// This should trigger nursery to publish the timeout tx.
ctx.receiveTx()
if ctx.restart() {
// Restart should retrigger broadcast of timeout tx.
ctx.receiveTx()
}
// Confirm the timeout tx. This should promote the HTLC to KNDR state.
timeoutTxHash := outgoingRes.SignedTimeoutTx.TxHash()
if err := ctx.notifier.confirmTx(&timeoutTxHash, 126); err != nil {
t.Fatal(err)
}
// Wait for output to be promoted in store to KNDR.
select {
case <-ctx.store.cribToKinderChan:
case <-time.After(defaultTestTimeout):
t.Fatalf("output not promoted to KNDR")
}
ctx.restart()
// Notify arrival of block where second level HTLC unlocks.
ctx.notifier.notifyEpoch(128)
// Check final sweep into wallet.
testSweepHtlc(t, ctx)
ctx.finish()
}
func TestNurseryOutgoingHtlcSuccessOnRemote(t *testing.T) {
testRestartLoop(t, testNurseryOutgoingHtlcSuccessOnRemote)
}
func testNurseryOutgoingHtlcSuccessOnRemote(t *testing.T,
checkStartStop func(func()) bool) {
ctx := createNurseryTestContext(t, checkStartStop)
outgoingRes := incubateTestOutput(t, ctx.nursery, false)
ctx.restart()
// Notify confirmation of the commitment tx. Is only listened to when
// resolving remote commitment tx.
//
// TODO(joostjager): This is probably not correct?
err := ctx.notifier.confirmTx(&outgoingRes.ClaimOutpoint.Hash, 124)
if err != nil {
t.Fatal(err)
}
// Wait for output to be promoted from PSCL to KNDR.
select {
case <-ctx.store.preschoolToKinderChan:
case <-time.After(defaultTestTimeout):
t.Fatalf("output not promoted to KNDR")
}
ctx.restart()
// Notify arrival of block where HTLC CLTV expires.
ctx.notifier.notifyEpoch(125)
// Check final sweep into wallet.
testSweepHtlc(t, ctx)
ctx.finish()
}
func TestNurseryCommitSuccessOnLocal(t *testing.T) {
testRestartLoop(t, testNurseryCommitSuccessOnLocal)
}
func testNurseryCommitSuccessOnLocal(t *testing.T,
checkStartStop func(func()) bool) {
ctx := createNurseryTestContext(t, checkStartStop)
commitRes := createCommitmentRes()
// Hand off to nursery.
err := ctx.nursery.IncubateOutputs(
testChanPoint,
commitRes, nil, nil, 0,
)
if err != nil {
t.Fatal(err)
}
// Verify that commitment output is showing up in nursery report as
// limbo balance.
assertNurseryReport(t, ctx.nursery, 0, 0, 10000)
ctx.restart()
// Notify confirmation of the commitment tx.
err = ctx.notifier.confirmTx(&commitRes.SelfOutPoint.Hash, 124)
if err != nil {
t.Fatal(err)
}
// Wait for output to be promoted from PSCL to KNDR.
select {
case <-ctx.store.preschoolToKinderChan:
case <-time.After(defaultTestTimeout):
t.Fatalf("output not promoted to KNDR")
}
ctx.restart()
// Notify arrival of block where commit output CSV expires.
ctx.notifier.notifyEpoch(126)
// Check final sweep into wallet.
testSweep(t, ctx, func() {
// Check limbo balance after sweep publication
assertNurseryReport(t, ctx.nursery, 0, 0, 10000)
})
ctx.finish()
}
func testSweepHtlc(t *testing.T, ctx *nurseryTestContext) {
testSweep(t, ctx, func() {
// Verify stage in nursery report. HTLCs should now both still
// be in stage two.
assertNurseryReport(t, ctx.nursery, 1, 2, 10000)
})
}
func testSweep(t *testing.T, ctx *nurseryTestContext,
afterPublishAssert func()) {
// Wait for nursery to publish the sweep tx.
sweepTx := ctx.receiveTx()
if ctx.restart() {
// Restart will trigger rebroadcast of sweep tx.
sweepTx = ctx.receiveTx()
}
afterPublishAssert()
// Confirm the sweep tx.
sweepTxHash := sweepTx.TxHash()
err := ctx.notifier.confirmTx(&sweepTxHash, 129)
if err != nil {
t.Fatal(err)
}
// Wait for output to be promoted in store to GRAD.
select {
case <-ctx.store.graduateKinderChan:
case <-time.After(defaultTestTimeout):
t.Fatalf("output not graduated")
}
ctx.restart()
// As there only was one output to graduate, we expect the channel to be
// closed and no report available anymore.
assertNurseryReportUnavailable(t, ctx.nursery)
}
type nurseryStoreInterceptor struct {
ns NurseryStore
// TODO(joostjager): put more useful info through these channels.
cribToKinderChan chan struct{}
cribToRemoteSpendChan chan struct{}
graduateKinderChan chan struct{}
preschoolToKinderChan chan struct{}
}
func newNurseryStoreInterceptor(ns NurseryStore) *nurseryStoreInterceptor {
return &nurseryStoreInterceptor{
ns: ns,
cribToKinderChan: make(chan struct{}),
cribToRemoteSpendChan: make(chan struct{}),
graduateKinderChan: make(chan struct{}),
preschoolToKinderChan: make(chan struct{}),
}
}
func (i *nurseryStoreInterceptor) Incubate(kidOutputs []kidOutput,
babyOutputs []babyOutput) error {
return i.ns.Incubate(kidOutputs, babyOutputs)
}
func (i *nurseryStoreInterceptor) CribToKinder(babyOutput *babyOutput) error {
err := i.ns.CribToKinder(babyOutput)
i.cribToKinderChan <- struct{}{}
return err
}
func (i *nurseryStoreInterceptor) PreschoolToKinder(kidOutput *kidOutput) error {
err := i.ns.PreschoolToKinder(kidOutput)
i.preschoolToKinderChan <- struct{}{}
return err
}
func (i *nurseryStoreInterceptor) GraduateKinder(height uint32) error {
err := i.ns.GraduateKinder(height)
i.graduateKinderChan <- struct{}{}
return err
}
func (i *nurseryStoreInterceptor) FetchPreschools() ([]kidOutput, error) {
return i.ns.FetchPreschools()
}
func (i *nurseryStoreInterceptor) FetchClass(height uint32) (*wire.MsgTx,
[]kidOutput, []babyOutput, error) {
return i.ns.FetchClass(height)
}
func (i *nurseryStoreInterceptor) FinalizeKinder(height uint32,
tx *wire.MsgTx) error {
return i.ns.FinalizeKinder(height, tx)
}
func (i *nurseryStoreInterceptor) LastFinalizedHeight() (uint32, error) {
return i.ns.LastFinalizedHeight()
}
func (i *nurseryStoreInterceptor) GraduateHeight(height uint32) error {
return i.ns.GraduateHeight(height)
}
func (i *nurseryStoreInterceptor) LastGraduatedHeight() (uint32, error) {
return i.ns.LastGraduatedHeight()
}
func (i *nurseryStoreInterceptor) HeightsBelowOrEqual(height uint32) (
[]uint32, error) {
return i.ns.HeightsBelowOrEqual(height)
}
func (i *nurseryStoreInterceptor) ForChanOutputs(chanPoint *wire.OutPoint,
callback func([]byte, []byte) error) error {
return i.ns.ForChanOutputs(chanPoint, callback)
}
func (i *nurseryStoreInterceptor) ListChannels() ([]wire.OutPoint, error) {
return i.ns.ListChannels()
}
func (i *nurseryStoreInterceptor) IsMatureChannel(chanPoint *wire.OutPoint) (
bool, error) {
return i.ns.IsMatureChannel(chanPoint)
}
func (i *nurseryStoreInterceptor) RemoveChannel(chanPoint *wire.OutPoint) error {
return i.ns.RemoveChannel(chanPoint)
}
type mockFeeEstimator struct{}
func (m *mockFeeEstimator) EstimateFeePerKW(
numBlocks uint32) (lnwallet.SatPerKWeight, error) {
return lnwallet.SatPerKWeight(10000), nil
}
func (m *mockFeeEstimator) Start() error {
return nil
}
func (m *mockFeeEstimator) Stop() error {
return nil
}
type nurseryMockSigner struct {
}
func (m *nurseryMockSigner) SignOutputRaw(tx *wire.MsgTx,
signDesc *lnwallet.SignDescriptor) ([]byte, error) {
return []byte{}, nil
}
func (m *nurseryMockSigner) ComputeInputScript(tx *wire.MsgTx,
signDesc *lnwallet.SignDescriptor) (*lnwallet.InputScript, error) {
return &lnwallet.InputScript{}, nil
}
type nurseryMockNotifier struct {
confChannel map[chainhash.Hash]chan *chainntnfs.TxConfirmation
epochChan chan *chainntnfs.BlockEpoch
spendChan chan *chainntnfs.SpendDetail
mutex sync.RWMutex
t *testing.T
}
func newNurseryMockNotifier(t *testing.T) *nurseryMockNotifier {
return &nurseryMockNotifier{
confChannel: make(map[chainhash.Hash]chan *chainntnfs.TxConfirmation),
epochChan: make(chan *chainntnfs.BlockEpoch),
spendChan: make(chan *chainntnfs.SpendDetail),
t: t,
}
}
func (m *nurseryMockNotifier) notifyEpoch(height int32) {
select {
case m.epochChan <- &chainntnfs.BlockEpoch{
Height: height,
}:
case <-time.After(defaultTestTimeout):
m.t.Fatal("epoch event not consumed")
}
}
func (m *nurseryMockNotifier) confirmTx(txid *chainhash.Hash, height uint32) error {
confirm := &chainntnfs.TxConfirmation{
BlockHeight: height,
}
select {
case m.getConfChannel(txid) <- confirm:
case <-time.After(defaultTestTimeout):
return fmt.Errorf("confirmation not consumed")
}
return nil
}
func (m *nurseryMockNotifier) RegisterConfirmationsNtfn(txid *chainhash.Hash,
_ []byte, numConfs, heightHint uint32) (*chainntnfs.ConfirmationEvent,
error) {
return &chainntnfs.ConfirmationEvent{
Confirmed: m.getConfChannel(txid),
}, nil
}
func (m *nurseryMockNotifier) getConfChannel(
txid *chainhash.Hash) chan *chainntnfs.TxConfirmation {
m.mutex.Lock()
defer m.mutex.Unlock()
channel, ok := m.confChannel[*txid]
if ok {
return channel
}
channel = make(chan *chainntnfs.TxConfirmation)
m.confChannel[*txid] = channel
return channel
}
func (m *nurseryMockNotifier) RegisterBlockEpochNtfn(
bestBlock *chainntnfs.BlockEpoch) (*chainntnfs.BlockEpochEvent, error) {
return &chainntnfs.BlockEpochEvent{
Epochs: m.epochChan,
Cancel: func() {},
}, nil
}
func (m *nurseryMockNotifier) Start() error {
return nil
}
func (m *nurseryMockNotifier) Stop() error {
return nil
}
func (m *nurseryMockNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint,
_ []byte, heightHint uint32) (*chainntnfs.SpendEvent, error) {
return &chainntnfs.SpendEvent{
Spend: m.spendChan,
Cancel: func() {},
}, nil
}