lnd.xprv/contractcourt/chain_watcher_test.go

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package contractcourt
import (
"bytes"
"crypto/sha256"
"testing"
"time"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
)
type mockNotifier struct {
spendChan chan *chainntnfs.SpendDetail
}
func (m *mockNotifier) RegisterConfirmationsNtfn(txid *chainhash.Hash, numConfs,
heightHint uint32) (*chainntnfs.ConfirmationEvent, error) {
return nil, nil
}
func (m *mockNotifier) RegisterBlockEpochNtfn() (*chainntnfs.BlockEpochEvent, error) {
return &chainntnfs.BlockEpochEvent{
Epochs: make(chan *chainntnfs.BlockEpoch),
Cancel: func() {},
}, nil
}
func (m *mockNotifier) Start() error {
return nil
}
func (m *mockNotifier) Stop() error {
return nil
}
func (m *mockNotifier) RegisterSpendNtfn(outpoint *wire.OutPoint,
heightHint uint32) (*chainntnfs.SpendEvent, error) {
return &chainntnfs.SpendEvent{
Spend: m.spendChan,
Cancel: func() {},
}, nil
}
// TestChainWatcherRemoteUnilateralClose tests that the chain watcher is able
// to properly detect a normal unilateral close by the remote node using their
// lowest commitment.
func TestChainWatcherRemoteUnilateralClose(t *testing.T) {
t.Parallel()
// First, we'll create two channels which already have established a
// commitment contract between themselves.
aliceChannel, bobChannel, cleanUp, err := lnwallet.CreateTestChannels()
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// With the channels created, we'll now create a chain watcher instance
// which will be watching for any closes of Alice's channel.
aliceNotifier := &mockNotifier{
spendChan: make(chan *chainntnfs.SpendDetail),
}
aliceChainWatcher, err := newChainWatcher(chainWatcherConfig{
chanState: aliceChannel.State(),
notifier: aliceNotifier,
signer: aliceChannel.Signer,
})
if err != nil {
t.Fatalf("unable to create chain watcher: %v", err)
}
err = aliceChainWatcher.Start()
if err != nil {
t.Fatalf("unable to start chain watcher: %v", err)
}
defer aliceChainWatcher.Stop()
// We'll request a new channel event subscription from Alice's chain
// watcher.
chanEvents := aliceChainWatcher.SubscribeChannelEvents()
// If we simulate an immediate broadcast of the current commitment by
// Bob, then the chain watcher should detect this case.
bobCommit := bobChannel.State().LocalCommitment.CommitTx
bobTxHash := bobCommit.TxHash()
bobSpend := &chainntnfs.SpendDetail{
SpenderTxHash: &bobTxHash,
SpendingTx: bobCommit,
}
aliceNotifier.spendChan <- bobSpend
// We should get a new spend event over the remote unilateral close
// event channel.
var uniClose *lnwallet.UnilateralCloseSummary
select {
case uniClose = <-chanEvents.RemoteUnilateralClosure:
case <-time.After(time.Second * 15):
t.Fatalf("didn't receive unilateral close event")
}
// The unilateral close should have properly located Alice's output in
// the commitment transaction.
if uniClose.CommitResolution == nil {
t.Fatalf("unable to find alice's commit resolution")
}
}
// TestChainWatcherRemoteUnilateralClosePendingCommit tests that the chain
// watcher is able to properly detect a unilateral close wherein the remote
// node broadcasts their newly received commitment, without first revoking the
// old one.
func TestChainWatcherRemoteUnilateralClosePendingCommit(t *testing.T) {
t.Parallel()
// First, we'll create two channels which already have established a
// commitment contract between themselves.
aliceChannel, bobChannel, cleanUp, err := lnwallet.CreateTestChannels()
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// With the channels created, we'll now create a chain watcher instance
// which will be watching for any closes of Alice's channel.
aliceNotifier := &mockNotifier{
spendChan: make(chan *chainntnfs.SpendDetail),
}
aliceChainWatcher, err := newChainWatcher(chainWatcherConfig{
chanState: aliceChannel.State(),
notifier: aliceNotifier,
signer: aliceChannel.Signer,
})
if err != nil {
t.Fatalf("unable to create chain watcher: %v", err)
}
if err := aliceChainWatcher.Start(); err != nil {
t.Fatalf("unable to start chain watcher: %v", err)
}
defer aliceChainWatcher.Stop()
// We'll request a new channel event subscription from Alice's chain
// watcher.
chanEvents := aliceChainWatcher.SubscribeChannelEvents()
// Next, we'll create a fake HTLC just so we can advance Alice's
// channel state to a new pending commitment on her remote commit chain
// for Bob.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
preimage := bytes.Repeat([]byte{byte(1)}, 32)
paymentHash := sha256.Sum256(preimage)
var returnPreimage [32]byte
copy(returnPreimage[:], preimage)
htlc := &lnwire.UpdateAddHTLC{
ID: uint64(0),
PaymentHash: paymentHash,
Amount: htlcAmount,
Expiry: uint32(5),
}
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// With the HTLC added, we'll now manually initiate a state transition
// from Alice to Bob.
_, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
// At this point, we'll now Bob broadcasting this new pending unrevoked
// commitment.
bobPendingCommit, err := aliceChannel.State().RemoteCommitChainTip()
if err != nil {
t.Fatal(err)
}
// We'll craft a fake spend notification with Bob's actual commitment.
// The chain watcher should be able to detect that this is a pending
// commit broadcast based on the state hints in the commitment.
bobCommit := bobPendingCommit.Commitment.CommitTx
bobTxHash := bobCommit.TxHash()
bobSpend := &chainntnfs.SpendDetail{
SpenderTxHash: &bobTxHash,
SpendingTx: bobCommit,
}
aliceNotifier.spendChan <- bobSpend
// We should get a new spend event over the remote unilateral close
// event channel.
var uniClose *lnwallet.UnilateralCloseSummary
select {
case uniClose = <-chanEvents.RemoteUnilateralClosure:
case <-time.After(time.Second * 15):
t.Fatalf("didn't receive unilateral close event")
}
// The unilateral close should have properly located Alice's output in
// the commitment transaction.
if uniClose.CommitResolution == nil {
t.Fatalf("unable to find alice's commit resolution")
}
}