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lnd.xprv/lnwallet/channel_test.go

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package lnwallet
import (
"bytes"
"container/list"
"crypto/sha256"
"fmt"
"reflect"
"runtime"
"testing"
"github.com/btcsuite/btcd/blockchain"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/davecgh/go-spew/spew"
"github.com/lightningnetwork/lnd/chainntnfs"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/input"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwallet/chainfee"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/stretchr/testify/require"
)
// createHTLC is a utility function for generating an HTLC with a given
// preimage and a given amount.
func createHTLC(id int, amount lnwire.MilliSatoshi) (*lnwire.UpdateAddHTLC, [32]byte) {
preimage := bytes.Repeat([]byte{byte(id)}, 32)
paymentHash := sha256.Sum256(preimage)
var returnPreimage [32]byte
copy(returnPreimage[:], preimage)
return &lnwire.UpdateAddHTLC{
ID: uint64(id),
PaymentHash: paymentHash,
Amount: amount,
Expiry: uint32(5),
}, returnPreimage
}
func assertOutputExistsByValue(t *testing.T, commitTx *wire.MsgTx,
value btcutil.Amount) {
for _, txOut := range commitTx.TxOut {
if txOut.Value == int64(value) {
return
}
}
t.Fatalf("unable to find output of value %v within tx %v", value,
spew.Sdump(commitTx))
}
// testAddSettleWorkflow tests a simple channel scenario where Alice and Bob
// add, the settle an HTLC between themselves.
func testAddSettleWorkflow(t *testing.T, tweakless bool) {
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
chanType := channeldb.SingleFunderTweaklessBit
if !tweakless {
chanType = channeldb.SingleFunderBit
}
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(chanType)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
paymentPreimage := bytes.Repeat([]byte{1}, 32)
paymentHash := sha256.Sum256(paymentPreimage)
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: htlcAmt,
Expiry: uint32(5),
}
// First Alice adds the outgoing HTLC to her local channel's state
// update log. Then Alice sends this wire message over to Bob who adds
// this htlc to his remote state update log.
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Next alice commits this change by sending a signature message. Since
// we expect the messages to be ordered, Bob will receive the HTLC we
// just sent before he receives this signature, so the signature will
// cover the HTLC.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Bob receives this signature message, and checks that this covers the
// state he has in his remote log. This includes the HTLC just sent
// from Alice.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
// Bob revokes his prior commitment given to him by Alice, since he now
// has a valid signature for a newer commitment.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
// Bob finally send a signature for Alice's commitment transaction.
// This signature will cover the HTLC, since Bob will first send the
// revocation just created. The revocation also acks every received
// HTLC up to the point where Alice sent here signature.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign alice's commitment: %v", err)
}
// Alice then processes this revocation, sending her own revocation for
// her prior commitment transaction. Alice shouldn't have any HTLCs to
// forward since she's sending an outgoing HTLC.
fwdPkg, _, _, _, err := aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to process bob's revocation: %v", err)
}
if len(fwdPkg.Adds) != 0 {
t.Fatalf("alice forwards %v add htlcs, should forward none",
len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("alice forwards %v settle/fail htlcs, "+
"should forward none", len(fwdPkg.SettleFails))
}
// Alice then processes bob's signature, and since she just received
// the revocation, she expect this signature to cover everything up to
// the point where she sent her signature, including the HTLC.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
// Alice then generates a revocation for bob.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke alice channel: %v", err)
}
// Finally Bob processes Alice's revocation, at this point the new HTLC
// is fully locked in within both commitment transactions. Bob should
// also be able to forward an HTLC now that the HTLC has been locked
// into both commitment transactions.
fwdPkg, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
if len(fwdPkg.Adds) != 1 {
t.Fatalf("bob forwards %v add htlcs, should only forward one",
len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("bob forwards %v settle/fail htlcs, "+
"should forward none", len(fwdPkg.SettleFails))
}
// At this point, both sides should have the proper number of satoshis
// sent, and commitment height updated within their local channel
// state.
aliceSent := lnwire.MilliSatoshi(0)
bobSent := lnwire.MilliSatoshi(0)
if aliceChannel.channelState.TotalMSatSent != aliceSent {
t.Fatalf("alice has incorrect milli-satoshis sent: %v vs %v",
aliceChannel.channelState.TotalMSatSent, aliceSent)
}
if aliceChannel.channelState.TotalMSatReceived != bobSent {
t.Fatalf("alice has incorrect milli-satoshis received %v vs %v",
aliceChannel.channelState.TotalMSatReceived, bobSent)
}
if bobChannel.channelState.TotalMSatSent != bobSent {
t.Fatalf("bob has incorrect milli-satoshis sent %v vs %v",
bobChannel.channelState.TotalMSatSent, bobSent)
}
if bobChannel.channelState.TotalMSatReceived != aliceSent {
t.Fatalf("bob has incorrect milli-satoshis received %v vs %v",
bobChannel.channelState.TotalMSatReceived, aliceSent)
}
if bobChannel.currentHeight != 1 {
t.Fatalf("bob has incorrect commitment height, %v vs %v",
bobChannel.currentHeight, 1)
}
if aliceChannel.currentHeight != 1 {
t.Fatalf("alice has incorrect commitment height, %v vs %v",
aliceChannel.currentHeight, 1)
}
// Both commitment transactions should have three outputs, and one of
// them should be exactly the amount of the HTLC.
if len(aliceChannel.channelState.LocalCommitment.CommitTx.TxOut) != 3 {
t.Fatalf("alice should have three commitment outputs, instead "+
"have %v",
len(aliceChannel.channelState.LocalCommitment.CommitTx.TxOut))
}
if len(bobChannel.channelState.LocalCommitment.CommitTx.TxOut) != 3 {
t.Fatalf("bob should have three commitment outputs, instead "+
"have %v",
len(bobChannel.channelState.LocalCommitment.CommitTx.TxOut))
}
assertOutputExistsByValue(t,
aliceChannel.channelState.LocalCommitment.CommitTx,
htlcAmt.ToSatoshis())
assertOutputExistsByValue(t,
bobChannel.channelState.LocalCommitment.CommitTx,
htlcAmt.ToSatoshis())
// Now we'll repeat a similar exchange, this time with Bob settling the
// HTLC once he learns of the preimage.
var preimage [32]byte
copy(preimage[:], paymentPreimage)
err = bobChannel.SettleHTLC(preimage, bobHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preimage, aliceHtlcIndex)
if err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
bobSig2, bobHtlcSigs2, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign settle commitment: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig2, bobHtlcSigs2)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
aliceRevocation2, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to generate revocation: %v", err)
}
aliceSig2, aliceHtlcSigs2, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign new commitment: %v", err)
}
fwdPkg, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation2)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
if len(fwdPkg.Adds) != 0 {
t.Fatalf("bob forwards %v add htlcs, should forward none",
len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("bob forwards %v settle/fail htlcs, "+
"should forward none", len(fwdPkg.SettleFails))
}
err = bobChannel.ReceiveNewCommitment(aliceSig2, aliceHtlcSigs2)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
bobRevocation2, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("bob unable to revoke commitment: %v", err)
}
fwdPkg, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation2)
if err != nil {
t.Fatalf("alice unable to process bob's revocation: %v", err)
}
if len(fwdPkg.Adds) != 0 {
// Alice should now be able to forward the settlement HTLC to
// any down stream peers.
t.Fatalf("alice should be forwarding an add HTLC, "+
"instead forwarding %v: %v", len(fwdPkg.Adds),
spew.Sdump(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 1 {
t.Fatalf("alice should be forwarding one settle/fails HTLC, "+
"instead forwarding: %v", len(fwdPkg.SettleFails))
}
// At this point, Bob should have 6 BTC settled, with Alice still
// having 4 BTC. Alice's channel should show 1 BTC sent and Bob's
// channel should show 1 BTC received. They should also be at
// commitment height two, with the revocation window extended by 1 (5).
mSatTransferred := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
if aliceChannel.channelState.TotalMSatSent != mSatTransferred {
t.Fatalf("alice satoshis sent incorrect %v vs %v expected",
aliceChannel.channelState.TotalMSatSent,
mSatTransferred)
}
if aliceChannel.channelState.TotalMSatReceived != 0 {
t.Fatalf("alice satoshis received incorrect %v vs %v expected",
aliceChannel.channelState.TotalMSatReceived, 0)
}
if bobChannel.channelState.TotalMSatReceived != mSatTransferred {
t.Fatalf("bob satoshis received incorrect %v vs %v expected",
bobChannel.channelState.TotalMSatReceived,
mSatTransferred)
}
if bobChannel.channelState.TotalMSatSent != 0 {
t.Fatalf("bob satoshis sent incorrect %v vs %v expected",
bobChannel.channelState.TotalMSatSent, 0)
}
if bobChannel.currentHeight != 2 {
t.Fatalf("bob has incorrect commitment height, %v vs %v",
bobChannel.currentHeight, 2)
}
if aliceChannel.currentHeight != 2 {
t.Fatalf("alice has incorrect commitment height, %v vs %v",
aliceChannel.currentHeight, 2)
}
// The logs of both sides should now be cleared since the entry adding
// the HTLC should have been removed once both sides receive the
// revocation.
if aliceChannel.localUpdateLog.Len() != 0 {
t.Fatalf("alice's local not updated, should be empty, has %v "+
"entries instead", aliceChannel.localUpdateLog.Len())
}
if aliceChannel.remoteUpdateLog.Len() != 0 {
t.Fatalf("alice's remote not updated, should be empty, has %v "+
"entries instead", aliceChannel.remoteUpdateLog.Len())
}
if len(aliceChannel.localUpdateLog.updateIndex) != 0 {
t.Fatalf("alice's local log index not cleared, should be empty but "+
"has %v entries", len(aliceChannel.localUpdateLog.updateIndex))
}
if len(aliceChannel.remoteUpdateLog.updateIndex) != 0 {
t.Fatalf("alice's remote log index not cleared, should be empty but "+
"has %v entries", len(aliceChannel.remoteUpdateLog.updateIndex))
}
}
// TestSimpleAddSettleWorkflow tests a simple channel scenario wherein the
// local node (Alice in this case) creates a new outgoing HTLC to bob, commits
// this change, then bob immediately commits a settlement of the HTLC after the
// initial add is fully committed in both commit chains.
//
// TODO(roasbeef): write higher level framework to exercise various states of
// the state machine
// * DSL language perhaps?
// * constructed via input/output files
func TestSimpleAddSettleWorkflow(t *testing.T) {
t.Parallel()
for _, tweakless := range []bool{true, false} {
tweakless := tweakless
t.Run(fmt.Sprintf("tweakless=%v", tweakless), func(t *testing.T) {
testAddSettleWorkflow(t, tweakless)
})
}
}
// TestChannelZeroAddLocalHeight tests that we properly set the addCommitHeightLocal
// field during state log restoration.
//
// The full state transition of this test is:
//
// Alice Bob
// -----add------>
// -----sig------>
// <----rev-------
// <----sig-------
// -----rev------>
// <---settle-----
// <----sig-------
// -----rev------>
// *alice dies*
// <----add-------
// x----sig-------
//
// The last sig will be rejected if addCommitHeightLocal is not set for the
// initial add that Alice sent. This test checks that this behavior does
// not occur and that we properly set the addCommitHeightLocal field.
func TestChannelZeroAddLocalHeight(t *testing.T) {
t.Parallel()
// Create a test channel so that we can test the buggy behavior.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
require.NoError(t, err)
defer cleanUp()
// First we create an HTLC that Alice sends to Bob.
htlc, _ := createHTLC(0, lnwire.MilliSatoshi(500000))
// -----add----->
_, err = aliceChannel.AddHTLC(htlc, nil)
require.NoError(t, err)
_, err = bobChannel.ReceiveHTLC(htlc)
require.NoError(t, err)
// Force a state transition to lock in this add on both commitments.
// -----sig----->
// <----rev------
// <----sig------
// -----rev----->
err = ForceStateTransition(aliceChannel, bobChannel)
require.NoError(t, err)
// Now Bob should fail the htlc back to Alice.
// <----fail-----
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
require.NoError(t, err)
err = aliceChannel.ReceiveFailHTLC(0, []byte("bad"))
require.NoError(t, err)
// Bob should send a commitment signature to Alice.
// <----sig------
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
require.NoError(t, err)
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
// Alice should reply with a revocation.
// -----rev----->
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
require.NoError(t, err)
// We now restore Alice's channel as this was the point at which
// the addCommitHeightLocal field wouldn't be set, causing a force
// close.
newAliceChannel, err := NewLightningChannel(
aliceChannel.Signer, aliceChannel.channelState,
aliceChannel.sigPool,
)
require.NoError(t, err)
// Bob now sends an htlc to Alice
htlc2, _ := createHTLC(0, lnwire.MilliSatoshi(500000))
// <----add-----
_, err = bobChannel.AddHTLC(htlc2, nil)
require.NoError(t, err)
_, err = newAliceChannel.ReceiveHTLC(htlc2)
require.NoError(t, err)
// Bob should now send a commitment signature to Alice.
// <----sig-----
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
require.NoError(t, err)
// Alice should accept the commitment. Previously she would
// force close here.
err = newAliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
}
// TestCheckCommitTxSize checks that estimation size of commitment
// transaction with some degree of error corresponds to the actual size.
func TestCheckCommitTxSize(t *testing.T) {
t.Parallel()
checkSize := func(channel *LightningChannel, count int) {
// Due to variable size of the signatures (70-73) in
// witness script actual size of commitment transaction might
// be lower on 6 weight.
BaseCommitmentTxSizeEstimationError := 6
commitTx, err := channel.getSignedCommitTx()
if err != nil {
t.Fatalf("unable to initiate alice force close: %v", err)
}
actualCost := blockchain.GetTransactionWeight(btcutil.NewTx(commitTx))
estimatedCost := input.EstimateCommitTxWeight(count, false)
diff := int(estimatedCost - actualCost)
if 0 > diff || BaseCommitmentTxSizeEstimationError < diff {
t.Fatalf("estimation is wrong, diff: %v", diff)
}
}
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Check that weight estimation of the commitment transaction without
// HTLCs is right.
checkSize(aliceChannel, 0)
checkSize(bobChannel, 0)
// Adding HTLCs and check that size stays in allowable estimation
// error window.
for i := 0; i <= 10; i++ {
htlc, _ := createHTLC(i, lnwire.MilliSatoshi(1e7))
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 receive htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
checkSize(aliceChannel, i+1)
checkSize(bobChannel, i+1)
}
// Settle HTLCs and check that estimation is counting cost of settle
// HTLCs properly.
for i := 10; i >= 0; i-- {
_, preimage := createHTLC(i, lnwire.MilliSatoshi(1e7))
err := bobChannel.SettleHTLC(preimage, uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preimage, uint64(i))
if err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
checkSize(aliceChannel, i)
checkSize(bobChannel, i)
}
}
// TestCommitHTLCSigTieBreak asserts that HTLC signatures are sent the proper
// BIP69+CLTV sorting expected by BOLT 3 when multiple HTLCs have identical
// payment hashes and amounts, but differing CLTVs. This is exercised by adding
// the HTLCs in the descending order of their CLTVs, and asserting that their
// order is reversed when signing.
func TestCommitHTLCSigTieBreak(t *testing.T) {
t.Run("no restart", func(t *testing.T) {
testCommitHTLCSigTieBreak(t, false)
})
t.Run("restart", func(t *testing.T) {
testCommitHTLCSigTieBreak(t, true)
})
}
func testCommitHTLCSigTieBreak(t *testing.T, restart bool) {
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels; %v", err)
}
defer cleanUp()
const (
htlcAmt = lnwire.MilliSatoshi(20000000)
numHtlcs = 2
)
// Add HTLCs with identical payment hashes and amounts, but descending
// CLTV values. We will expect the signatures to appear in the reverse
// order that the HTLCs are added due to the commitment sorting.
for i := 0; i < numHtlcs; i++ {
var (
preimage lntypes.Preimage
hash = preimage.Hash()
)
htlc := &lnwire.UpdateAddHTLC{
ID: uint64(i),
PaymentHash: hash,
Amount: htlcAmt,
Expiry: uint32(numHtlcs - i),
}
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 receive htlc: %v", err)
}
}
// Have Alice initiate the first half of the commitment dance. The
// tie-breaking for commitment sorting won't affect the commitment
// signed by Alice because received HTLC scripts commit to the CLTV
// directly, so the outputs will have different scriptPubkeys.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign alice's commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive alice's commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob's commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to receive bob's revocation: %v", err)
}
// Now have Bob initiate the second half of the commitment dance. Here
// the offered HTLC scripts he adds for Alice will need to have the
// tie-breaking applied because the CLTV is not committed, but instead
// implicit via the construction of the second-level transactions.
bobSig, bobHtlcSigs, bobHtlcs, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign bob's commitment: %v", err)
}
if len(bobHtlcs) != numHtlcs {
t.Fatalf("expected %d htlcs, got: %v", numHtlcs, len(bobHtlcs))
}
// Ensure that our HTLCs appear in the reverse order from which they
// were added by inspecting each's outpoint index. We expect the output
// indexes to be in descending order, i.e. the first HTLC added had the
// highest CLTV and should end up last.
lastIndex := bobHtlcs[0].OutputIndex
for i, htlc := range bobHtlcs[1:] {
if htlc.OutputIndex >= lastIndex {
t.Fatalf("htlc %d output index %d is not descending",
i, htlc.OutputIndex)
}
lastIndex = htlc.OutputIndex
}
// If requsted, restart Alice so that we can test that the necessary
// indexes can be reconstructed before needing to validate the
// signatures from Bob.
if restart {
aliceState := aliceChannel.channelState
aliceChannels, err := aliceState.Db.FetchOpenChannels(
aliceState.IdentityPub,
)
if err != nil {
t.Fatalf("unable to fetch channel: %v", err)
}
aliceChannelNew, err := NewLightningChannel(
aliceChannel.Signer, aliceChannels[0],
aliceChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
aliceChannel = aliceChannelNew
}
// Finally, have Alice validate the signatures to ensure that she is
// expecting the signatures in the proper order.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive bob's commitment: %v", err)
}
}
// TestCooperativeChannelClosure checks that the coop close process finishes
// with an agreement from both parties, and that the final balances of the
// close tx check out.
func TestCooperativeChannelClosure(t *testing.T) {
t.Run("tweakless", func(t *testing.T) {
testCoopClose(t, &coopCloseTestCase{
chanType: channeldb.SingleFunderTweaklessBit,
})
})
t.Run("anchors", func(t *testing.T) {
testCoopClose(t, &coopCloseTestCase{
chanType: channeldb.SingleFunderTweaklessBit |
channeldb.AnchorOutputsBit,
anchorAmt: anchorSize * 2,
})
})
}
type coopCloseTestCase struct {
chanType channeldb.ChannelType
anchorAmt btcutil.Amount
}
func testCoopClose(t *testing.T, testCase *coopCloseTestCase) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
testCase.chanType,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
aliceDeliveryScript := bobsPrivKey[:]
bobDeliveryScript := testHdSeed[:]
aliceFeeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
bobFeeRate := chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
)
// We'll start with both Alice and Bob creating a new close proposal
// with the same fee.
aliceFee := aliceChannel.CalcFee(aliceFeeRate)
aliceSig, _, _, err := aliceChannel.CreateCloseProposal(
aliceFee, aliceDeliveryScript, bobDeliveryScript,
)
if err != nil {
t.Fatalf("unable to create alice coop close proposal: %v", err)
}
bobFee := bobChannel.CalcFee(bobFeeRate)
bobSig, _, _, err := bobChannel.CreateCloseProposal(
bobFee, bobDeliveryScript, aliceDeliveryScript,
)
if err != nil {
t.Fatalf("unable to create bob coop close proposal: %v", err)
}
// With the proposals created, both sides should be able to properly
// process the other party's signature. This indicates that the
// transaction is well formed, and the signatures verify.
aliceCloseTx, bobTxBalance, err := bobChannel.CompleteCooperativeClose(
bobSig, aliceSig, bobDeliveryScript, aliceDeliveryScript,
bobFee,
)
if err != nil {
t.Fatalf("unable to complete alice cooperative close: %v", err)
}
bobCloseSha := aliceCloseTx.TxHash()
bobCloseTx, aliceTxBalance, err := aliceChannel.CompleteCooperativeClose(
aliceSig, bobSig, aliceDeliveryScript, bobDeliveryScript,
aliceFee,
)
if err != nil {
t.Fatalf("unable to complete bob cooperative close: %v", err)
}
aliceCloseSha := bobCloseTx.TxHash()
if bobCloseSha != aliceCloseSha {
t.Fatalf("alice and bob close transactions don't match: %v", err)
}
// Finally, make sure the final balances are correct from both's
// perspective.
aliceBalance := aliceChannel.channelState.LocalCommitment.
LocalBalance.ToSatoshis()
// The commit balance have had the initiator's (Alice) commitfee and
// any anchors subtracted, so add that back to the final expected
// balance. Alice also pays the coop close fee, so that must be
// subtracted.
commitFee := aliceChannel.channelState.LocalCommitment.CommitFee
expBalanceAlice := aliceBalance + commitFee +
testCase.anchorAmt - bobFee
if aliceTxBalance != expBalanceAlice {
t.Fatalf("expected balance %v got %v", expBalanceAlice,
aliceTxBalance)
}
// Bob is not the initiator, so his final balance should simply be
// equal to the latest commitment balance.
expBalanceBob := bobChannel.channelState.LocalCommitment.
LocalBalance.ToSatoshis()
if bobTxBalance != expBalanceBob {
t.Fatalf("expected bob's balance to be %v got %v",
expBalanceBob, bobTxBalance)
}
}
// TestForceClose checks that the resulting ForceCloseSummary is correct when a
// peer is ForceClosing the channel. Will check outputs both above and below
// the dust limit. Additionally, we'll ensure that the node which executed the
// force close generates HTLC resolutions that are capable of sweeping both
// incoming and outgoing HTLC's.
func TestForceClose(t *testing.T) {
t.Run("tweakless", func(t *testing.T) {
testForceClose(t, &forceCloseTestCase{
chanType: channeldb.SingleFunderTweaklessBit,
expectedCommitWeight: input.CommitWeight,
})
})
t.Run("anchors", func(t *testing.T) {
testForceClose(t, &forceCloseTestCase{
chanType: channeldb.SingleFunderTweaklessBit |
channeldb.AnchorOutputsBit,
expectedCommitWeight: input.AnchorCommitWeight,
anchorAmt: anchorSize * 2,
})
})
}
type forceCloseTestCase struct {
chanType channeldb.ChannelType
expectedCommitWeight int64
anchorAmt btcutil.Amount
}
func testForceClose(t *testing.T, testCase *forceCloseTestCase) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
testCase.chanType,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
bobAmount := bobChannel.channelState.LocalCommitment.LocalBalance
// First, we'll add an outgoing HTLC from Alice to Bob, such that it
// will still be present within the broadcast commitment transaction.
// We'll ensure that the HTLC amount is above Alice's dust limit.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// We'll also a distinct HTLC from Bob -> Alice. This way, Alice will
// have both an incoming and outgoing HTLC on her commitment
// transaction.
htlcBob, preimageBob := createHTLC(0, htlcAmount)
if _, err := bobChannel.AddHTLC(htlcBob, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := aliceChannel.ReceiveHTLC(htlcBob); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// Next, we'll perform two state transitions to ensure that both HTLC's
// get fully locked-in.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
// With the cache populated, we'll now attempt the force close
// initiated by Alice.
closeSummary, err := aliceChannel.ForceClose()
if err != nil {
t.Fatalf("unable to force close channel: %v", err)
}
// Alice should detect that she can sweep the outgoing HTLC after a
// timeout, but also that she's able to sweep in incoming HTLC Bob sent
// her.
if len(closeSummary.HtlcResolutions.OutgoingHTLCs) != 1 {
t.Fatalf("alice out htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(closeSummary.HtlcResolutions.OutgoingHTLCs))
}
if len(closeSummary.HtlcResolutions.IncomingHTLCs) != 1 {
t.Fatalf("alice in htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(closeSummary.HtlcResolutions.IncomingHTLCs))
}
// Verify the anchor resolutions for the anchor commitment format.
if testCase.chanType.HasAnchors() {
// Check the close summary resolution.
anchorRes := closeSummary.AnchorResolution
if anchorRes == nil {
t.Fatal("expected anchor resolution")
}
if anchorRes.CommitAnchor.Hash != closeSummary.CloseTx.TxHash() {
t.Fatal("commit tx not referenced by anchor res")
}
if anchorRes.AnchorSignDescriptor.Output.Value !=
int64(anchorSize) {
t.Fatal("unexpected anchor size")
}
if anchorRes.AnchorSignDescriptor.WitnessScript == nil {
t.Fatal("expected anchor witness script")
}
// Check the pre-confirmation resolutions.
resList, err := aliceChannel.NewAnchorResolutions()
if err != nil {
t.Fatalf("pre-confirmation resolution error: %v", err)
}
if len(resList) != 2 {
t.Fatal("expected two resolutions")
}
}
// The SelfOutputSignDesc should be non-nil since the output to-self is
// non-dust.
aliceCommitResolution := closeSummary.CommitResolution
if aliceCommitResolution == nil {
t.Fatalf("alice fails to include to-self output in " +
"ForceCloseSummary")
}
// The rest of the close summary should have been populated properly.
aliceDelayPoint := aliceChannel.channelState.LocalChanCfg.DelayBasePoint
if !aliceCommitResolution.SelfOutputSignDesc.KeyDesc.PubKey.IsEqual(
aliceDelayPoint.PubKey,
) {
t.Fatalf("alice incorrect pubkey in SelfOutputSignDesc")
}
// Factoring in the fee rate, Alice's amount should properly reflect
// that we've added two additional HTLC to the commitment transaction.
totalCommitWeight := testCase.expectedCommitWeight +
(input.HTLCWeight * 2)
feePerKw := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
commitFee := feePerKw.FeeForWeight(totalCommitWeight)
expectedAmount := (aliceChannel.Capacity / 2) -
htlcAmount.ToSatoshis() - commitFee - testCase.anchorAmt
if aliceCommitResolution.SelfOutputSignDesc.Output.Value != int64(expectedAmount) {
t.Fatalf("alice incorrect output value in SelfOutputSignDesc, "+
"expected %v, got %v", int64(expectedAmount),
aliceCommitResolution.SelfOutputSignDesc.Output.Value)
}
// Alice's listed CSV delay should also match the delay that was
// pre-committed to at channel opening.
if aliceCommitResolution.MaturityDelay !=
uint32(aliceChannel.channelState.LocalChanCfg.CsvDelay) {
t.Fatalf("alice: incorrect local CSV delay in ForceCloseSummary, "+
"expected %v, got %v",
aliceChannel.channelState.LocalChanCfg.CsvDelay,
aliceCommitResolution.MaturityDelay)
}
// Next, we'll ensure that the second level HTLC transaction it itself
// spendable, and also that the delivery output (with delay) itself has
// a valid sign descriptor.
htlcResolution := closeSummary.HtlcResolutions.OutgoingHTLCs[0]
outHtlcIndex := htlcResolution.SignedTimeoutTx.TxIn[0].PreviousOutPoint.Index
senderHtlcPkScript := closeSummary.CloseTx.TxOut[outHtlcIndex].PkScript
// First, verify that the second level transaction can properly spend
// the multi-sig clause within the output on the commitment transaction
// that produces this HTLC.
timeoutTx := htlcResolution.SignedTimeoutTx
vm, err := txscript.NewEngine(senderHtlcPkScript,
timeoutTx, 0, txscript.StandardVerifyFlags, nil,
nil, int64(htlcAmount.ToSatoshis()))
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
// Next, we'll ensure that we can spend the output of the second level
// transaction given a properly crafted sweep transaction.
sweepTx := wire.NewMsgTx(2)
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: wire.OutPoint{
Hash: htlcResolution.SignedTimeoutTx.TxHash(),
Index: 0,
},
})
sweepTx.AddTxOut(&wire.TxOut{
PkScript: senderHtlcPkScript,
Value: htlcResolution.SweepSignDesc.Output.Value,
})
htlcResolution.SweepSignDesc.InputIndex = 0
sweepTx.TxIn[0].Witness, err = input.HtlcSpendSuccess(aliceChannel.Signer,
&htlcResolution.SweepSignDesc, sweepTx,
uint32(aliceChannel.channelState.LocalChanCfg.CsvDelay))
if err != nil {
t.Fatalf("unable to gen witness for timeout output: %v", err)
}
// With the witness fully populated for the success spend from the
// second-level transaction, we ensure that the scripts properly
// validate given the information within the htlc resolution struct.
vm, err = txscript.NewEngine(
htlcResolution.SweepSignDesc.Output.PkScript,
sweepTx, 0, txscript.StandardVerifyFlags, nil,
nil, htlcResolution.SweepSignDesc.Output.Value,
)
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
// Finally, the txid of the commitment transaction and the one returned
// as the closing transaction should also match.
closeTxHash := closeSummary.CloseTx.TxHash()
commitTxHash := aliceChannel.channelState.LocalCommitment.CommitTx.TxHash()
if !bytes.Equal(closeTxHash[:], commitTxHash[:]) {
t.Fatalf("alice: incorrect close transaction txid")
}
// We'll now perform similar set of checks to ensure that Alice is able
// to sweep the output that Bob sent to her on-chain with knowledge of
// the preimage.
inHtlcResolution := closeSummary.HtlcResolutions.IncomingHTLCs[0]
inHtlcIndex := inHtlcResolution.SignedSuccessTx.TxIn[0].PreviousOutPoint.Index
receiverHtlcScript := closeSummary.CloseTx.TxOut[inHtlcIndex].PkScript
// With the original pkscript located, we'll now verify that the second
// level transaction can spend from the multi-sig out. Supply the
// preimage manually. This is usually done by the contract resolver
// before publication.
successTx := inHtlcResolution.SignedSuccessTx
successTx.TxIn[0].Witness[3] = preimageBob[:]
vm, err = txscript.NewEngine(receiverHtlcScript,
successTx, 0, txscript.StandardVerifyFlags, nil,
nil, int64(htlcAmount.ToSatoshis()))
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc success spend is invalid: %v", err)
}
// Finally, we'll construct a transaction to spend the produced
// second-level output with the attached SignDescriptor.
sweepTx = wire.NewMsgTx(2)
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: inHtlcResolution.ClaimOutpoint,
})
sweepTx.AddTxOut(&wire.TxOut{
PkScript: receiverHtlcScript,
Value: inHtlcResolution.SweepSignDesc.Output.Value,
})
inHtlcResolution.SweepSignDesc.InputIndex = 0
sweepTx.TxIn[0].Witness, err = input.HtlcSpendSuccess(aliceChannel.Signer,
&inHtlcResolution.SweepSignDesc, sweepTx,
uint32(aliceChannel.channelState.LocalChanCfg.CsvDelay))
if err != nil {
t.Fatalf("unable to gen witness for timeout output: %v", err)
}
// The spend we create above spending the second level HTLC output
// should validate without any issues.
vm, err = txscript.NewEngine(
inHtlcResolution.SweepSignDesc.Output.PkScript,
sweepTx, 0, txscript.StandardVerifyFlags, nil,
nil, inHtlcResolution.SweepSignDesc.Output.Value,
)
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
// Check the same for Bob's ForceCloseSummary.
closeSummary, err = bobChannel.ForceClose()
if err != nil {
t.Fatalf("unable to force close channel: %v", err)
}
bobCommitResolution := closeSummary.CommitResolution
if bobCommitResolution == nil {
t.Fatalf("bob fails to include to-self output in ForceCloseSummary")
}
bobDelayPoint := bobChannel.channelState.LocalChanCfg.DelayBasePoint
if !bobCommitResolution.SelfOutputSignDesc.KeyDesc.PubKey.IsEqual(bobDelayPoint.PubKey) {
t.Fatalf("bob incorrect pubkey in SelfOutputSignDesc")
}
if bobCommitResolution.SelfOutputSignDesc.Output.Value !=
int64(bobAmount.ToSatoshis()-htlcAmount.ToSatoshis()) {
t.Fatalf("bob incorrect output value in SelfOutputSignDesc, "+
"expected %v, got %v",
bobAmount.ToSatoshis(),
int64(bobCommitResolution.SelfOutputSignDesc.Output.Value))
}
if bobCommitResolution.MaturityDelay !=
uint32(bobChannel.channelState.LocalChanCfg.CsvDelay) {
t.Fatalf("bob: incorrect local CSV delay in ForceCloseSummary, "+
"expected %v, got %v",
bobChannel.channelState.LocalChanCfg.CsvDelay,
bobCommitResolution.MaturityDelay)
}
closeTxHash = closeSummary.CloseTx.TxHash()
commitTxHash = bobChannel.channelState.LocalCommitment.CommitTx.TxHash()
if !bytes.Equal(closeTxHash[:], commitTxHash[:]) {
t.Fatalf("bob: incorrect close transaction txid")
}
// As we didn't add the preimage of Alice's HTLC to bob's preimage
// cache, he should only detect that he can sweep only his outgoing
// HTLC upon force close.
if len(closeSummary.HtlcResolutions.OutgoingHTLCs) != 1 {
t.Fatalf("alice out htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(closeSummary.HtlcResolutions.OutgoingHTLCs))
}
// Bob should recognize that the incoming HTLC is there, but the
// preimage should be empty as he doesn't have the knowledge required
// to sweep it.
if len(closeSummary.HtlcResolutions.IncomingHTLCs) != 1 {
t.Fatalf("bob in htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(closeSummary.HtlcResolutions.IncomingHTLCs))
}
}
// TestForceCloseDustOutput tests that if either side force closes with an
// active dust output (for only a single party due to asymmetric dust values),
// then the force close summary is well crafted.
func TestForceCloseDustOutput(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We set both node's channel reserves to 0, to make sure
// they can create small dust ouputs without going under
// their channel reserves.
aliceChannel.channelState.LocalChanCfg.ChanReserve = 0
bobChannel.channelState.LocalChanCfg.ChanReserve = 0
aliceChannel.channelState.RemoteChanCfg.ChanReserve = 0
bobChannel.channelState.RemoteChanCfg.ChanReserve = 0
htlcAmount := lnwire.NewMSatFromSatoshis(500)
aliceAmount := aliceChannel.channelState.LocalCommitment.LocalBalance
bobAmount := bobChannel.channelState.LocalCommitment.LocalBalance
// Have Bobs' to-self output be below her dust limit and check
// ForceCloseSummary again on both peers.
htlc, preimage := createHTLC(0, bobAmount-htlcAmount)
bobHtlcIndex, err := bobChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
aliceHtlcIndex, err := aliceChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("bob unable to receive htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
// Settle HTLC and sign new commitment.
err = aliceChannel.SettleHTLC(preimage, aliceHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(preimage, bobHtlcIndex)
if err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
aliceAmount = aliceChannel.channelState.LocalCommitment.LocalBalance
bobAmount = bobChannel.channelState.LocalCommitment.RemoteBalance
closeSummary, err := aliceChannel.ForceClose()
if err != nil {
t.Fatalf("unable to force close channel: %v", err)
}
// Alice's to-self output should still be in the commitment
// transaction.
commitResolution := closeSummary.CommitResolution
if commitResolution == nil {
t.Fatalf("alice fails to include to-self output in " +
"ForceCloseSummary")
}
if !commitResolution.SelfOutputSignDesc.KeyDesc.PubKey.IsEqual(
aliceChannel.channelState.LocalChanCfg.DelayBasePoint.PubKey,
) {
t.Fatalf("alice incorrect pubkey in SelfOutputSignDesc")
}
if commitResolution.SelfOutputSignDesc.Output.Value !=
int64(aliceAmount.ToSatoshis()) {
t.Fatalf("alice incorrect output value in SelfOutputSignDesc, "+
"expected %v, got %v",
aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis(),
commitResolution.SelfOutputSignDesc.Output.Value)
}
if commitResolution.MaturityDelay !=
uint32(aliceChannel.channelState.LocalChanCfg.CsvDelay) {
t.Fatalf("alice: incorrect local CSV delay in ForceCloseSummary, "+
"expected %v, got %v",
aliceChannel.channelState.LocalChanCfg.CsvDelay,
commitResolution.MaturityDelay)
}
closeTxHash := closeSummary.CloseTx.TxHash()
commitTxHash := aliceChannel.channelState.LocalCommitment.CommitTx.TxHash()
if !bytes.Equal(closeTxHash[:], commitTxHash[:]) {
t.Fatalf("alice: incorrect close transaction txid")
}
closeSummary, err = bobChannel.ForceClose()
if err != nil {
t.Fatalf("unable to force close channel: %v", err)
}
// Bob's to-self output is below Bob's dust value and should be
// reflected in the ForceCloseSummary.
commitResolution = closeSummary.CommitResolution
if commitResolution != nil {
t.Fatalf("bob incorrectly includes to-self output in " +
"ForceCloseSummary")
}
closeTxHash = closeSummary.CloseTx.TxHash()
commitTxHash = bobChannel.channelState.LocalCommitment.CommitTx.TxHash()
if !bytes.Equal(closeTxHash[:], commitTxHash[:]) {
t.Fatalf("bob: incorrect close transaction txid")
}
}
// TestDustHTLCFees checks that fees are calculated correctly when HTLCs fall
// below the nodes' dust limit. In these cases, the amount of the dust HTLCs
// should be applied to the commitment transaction fee.
func TestDustHTLCFees(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
aliceStartingBalance := aliceChannel.channelState.LocalCommitment.LocalBalance
// This HTLC amount should be lower than the dust limits of both nodes.
htlcAmount := lnwire.NewMSatFromSatoshis(100)
htlc, _ := createHTLC(0, htlcAmount)
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 receive htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
// After the transition, we'll ensure that we performed fee accounting
// properly. Namely, the local+remote+commitfee values should add up to
// the total capacity of the channel. This same should hold for both
// sides.
totalSatoshisAlice := (aliceChannel.channelState.LocalCommitment.LocalBalance +
aliceChannel.channelState.LocalCommitment.RemoteBalance +
lnwire.NewMSatFromSatoshis(aliceChannel.channelState.LocalCommitment.CommitFee))
if totalSatoshisAlice+htlcAmount != lnwire.NewMSatFromSatoshis(aliceChannel.Capacity) {
t.Fatalf("alice's funds leaked: total satoshis are %v, but channel "+
"capacity is %v", int64(totalSatoshisAlice),
int64(aliceChannel.Capacity))
}
totalSatoshisBob := (bobChannel.channelState.LocalCommitment.LocalBalance +
bobChannel.channelState.LocalCommitment.RemoteBalance +
lnwire.NewMSatFromSatoshis(bobChannel.channelState.LocalCommitment.CommitFee))
if totalSatoshisBob+htlcAmount != lnwire.NewMSatFromSatoshis(bobChannel.Capacity) {
t.Fatalf("bob's funds leaked: total satoshis are %v, but channel "+
"capacity is %v", int64(totalSatoshisBob),
int64(bobChannel.Capacity))
}
// The commitment fee paid should be the same, as there have been no
// new material outputs added.
defaultFee := calcStaticFee(channeldb.SingleFunderTweaklessBit, 0)
if aliceChannel.channelState.LocalCommitment.CommitFee != defaultFee {
t.Fatalf("dust htlc amounts not subtracted from commitment fee "+
"expected %v, got %v", defaultFee,
aliceChannel.channelState.LocalCommitment.CommitFee)
}
if bobChannel.channelState.LocalCommitment.CommitFee != defaultFee {
t.Fatalf("dust htlc amounts not subtracted from commitment fee "+
"expected %v, got %v", defaultFee,
bobChannel.channelState.LocalCommitment.CommitFee)
}
// Alice's final balance should reflect the HTLC deficit even though
// the HTLC was paid to fees as it was trimmed.
aliceEndBalance := aliceChannel.channelState.LocalCommitment.LocalBalance
aliceExpectedBalance := aliceStartingBalance - htlcAmount
if aliceEndBalance != aliceExpectedBalance {
t.Fatalf("alice not credited for dust: expected %v, got %v",
aliceExpectedBalance, aliceEndBalance)
}
}
// TestHTLCDustLimit checks the situation in which an HTLC is larger than one
// channel participant's dust limit, but smaller than the other participant's
// dust limit. In this case, the participants' commitment chains will diverge.
// In one commitment chain, the HTLC will be added as normal, in the other
// chain, the amount of the HTLC will contribute to the fees to be paid.
func TestHTLCDustLimit(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// The amount of the HTLC should be above Alice's dust limit and below
// Bob's dust limit.
htlcSat := (btcutil.Amount(500) + HtlcTimeoutFee(
aliceChannel.channelState.ChanType,
chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
),
))
htlcAmount := lnwire.NewMSatFromSatoshis(htlcSat)
htlc, preimage := createHTLC(0, htlcAmount)
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("bob unable to receive htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
// At this point, Alice's commitment transaction should have an HTLC,
// while Bob's should not, because the value falls beneath his dust
// limit. The amount of the HTLC should be applied to fees in Bob's
// commitment transaction.
aliceCommitment := aliceChannel.localCommitChain.tip()
if len(aliceCommitment.txn.TxOut) != 3 {
t.Fatalf("incorrect # of outputs: expected %v, got %v",
3, len(aliceCommitment.txn.TxOut))
}
bobCommitment := bobChannel.localCommitChain.tip()
if len(bobCommitment.txn.TxOut) != 2 {
t.Fatalf("incorrect # of outputs: expected %v, got %v",
2, len(bobCommitment.txn.TxOut))
}
defaultFee := calcStaticFee(channeldb.SingleFunderTweaklessBit, 0)
if bobChannel.channelState.LocalCommitment.CommitFee != defaultFee {
t.Fatalf("dust htlc amount was subtracted from commitment fee "+
"expected %v, got %v", defaultFee,
bobChannel.channelState.LocalCommitment.CommitFee)
}
// Settle HTLC and create a new commitment state.
err = bobChannel.SettleHTLC(preimage, bobHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preimage, aliceHtlcIndex)
if err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("state transition error: %v", err)
}
// At this point, for Alice's commitment chains, the value of the HTLC
// should have been added to Alice's balance and TotalSatoshisSent.
commitment := aliceChannel.localCommitChain.tip()
if len(commitment.txn.TxOut) != 2 {
t.Fatalf("incorrect # of outputs: expected %v, got %v",
2, len(commitment.txn.TxOut))
}
if aliceChannel.channelState.TotalMSatSent != htlcAmount {
t.Fatalf("alice satoshis sent incorrect: expected %v, got %v",
htlcAmount, aliceChannel.channelState.TotalMSatSent)
}
}
// TestHTLCSigNumber tests that a received commitment is only accepted if it
// comes with the exact number of valid HTLC signatures.
func TestHTLCSigNumber(t *testing.T) {
t.Parallel()
// createChanWithHTLC is a helper method that sets ut two channels, and
// adds HTLCs with the passed values to the channels.
createChanWithHTLC := func(htlcValues ...btcutil.Amount) (
*LightningChannel, *LightningChannel, func()) {
// Create a test channel funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC. Alice's dustlimit is 200 sat, while
// Bob has 1300 sat.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
for i, htlcSat := range htlcValues {
htlcMsat := lnwire.NewMSatFromSatoshis(htlcSat)
htlc, _ := createHTLC(i, htlcMsat)
_, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
_, err = bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("bob unable to receive htlc: %v", err)
}
}
return aliceChannel, bobChannel, cleanUp
}
// Calculate two values that will be below and above Bob's dust limit.
estimator := chainfee.NewStaticEstimator(6000, 0)
feePerKw, err := estimator.EstimateFeePerKW(1)
if err != nil {
t.Fatalf("unable to get fee: %v", err)
}
belowDust := btcutil.Amount(500) + HtlcTimeoutFee(
channeldb.SingleFunderTweaklessBit, feePerKw,
)
aboveDust := btcutil.Amount(1400) + HtlcSuccessFee(
channeldb.SingleFunderTweaklessBit, feePerKw,
)
// ===================================================================
// Test that Bob will reject a commitment if Alice doesn't send enough
// HTLC signatures.
// ===================================================================
aliceChannel, bobChannel, cleanUp := createChanWithHTLC(aboveDust,
aboveDust)
defer cleanUp()
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("Error signing next commitment: %v", err)
}
if len(aliceHtlcSigs) != 2 {
t.Fatalf("expected 2 htlc sig, instead got %v",
len(aliceHtlcSigs))
}
// Now discard one signature from the htlcSig slice. Bob should reject
// the commitment because of this.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs[1:])
if err == nil {
t.Fatalf("Expected Bob to reject signatures")
}
// ===================================================================
// Test that Bob will reject a commitment if Alice doesn't send any
// HTLC signatures.
// ===================================================================
aliceChannel, bobChannel, cleanUp = createChanWithHTLC(aboveDust)
defer cleanUp()
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("Error signing next commitment: %v", err)
}
if len(aliceHtlcSigs) != 1 {
t.Fatalf("expected 1 htlc sig, instead got %v",
len(aliceHtlcSigs))
}
// Now just give Bob an empty htlcSig slice. He should reject the
// commitment because of this.
err = bobChannel.ReceiveNewCommitment(aliceSig, []lnwire.Sig{})
if err == nil {
t.Fatalf("Expected Bob to reject signatures")
}
// ==============================================================
// Test that sigs are not returned for HTLCs below dust limit.
// ==============================================================
aliceChannel, bobChannel, cleanUp = createChanWithHTLC(belowDust)
defer cleanUp()
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("Error signing next commitment: %v", err)
}
// Since the HTLC is below Bob's dust limit, Alice won't need to send
// any signatures for this HTLC.
if len(aliceHtlcSigs) != 0 {
t.Fatalf("expected no htlc sigs, instead got %v",
len(aliceHtlcSigs))
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("Bob failed receiving commitment: %v", err)
}
// ================================================================
// Test that sigs are correctly returned for HTLCs above dust limit.
// ================================================================
aliceChannel, bobChannel, cleanUp = createChanWithHTLC(aboveDust)
defer cleanUp()
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("Error signing next commitment: %v", err)
}
// Since the HTLC is above Bob's dust limit, Alice should send a
// signature for this HTLC.
if len(aliceHtlcSigs) != 1 {
t.Fatalf("expected 1 htlc sig, instead got %v",
len(aliceHtlcSigs))
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("Bob failed receiving commitment: %v", err)
}
// ====================================================================
// Test that Bob will not validate a received commitment if Alice sends
// signatures for HTLCs below the dust limit.
// ====================================================================
aliceChannel, bobChannel, cleanUp = createChanWithHTLC(belowDust,
aboveDust)
defer cleanUp()
// Alice should produce only one signature, since one HTLC is below
// dust.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("Error signing next commitment: %v", err)
}
if len(aliceHtlcSigs) != 1 {
t.Fatalf("expected 1 htlc sig, instead got %v",
len(aliceHtlcSigs))
}
// Add an extra signature.
aliceHtlcSigs = append(aliceHtlcSigs, aliceHtlcSigs[0])
// Bob should reject these signatures since they don't match the number
// of HTLCs above dust.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err == nil {
t.Fatalf("Expected Bob to reject signatures")
}
}
// TestChannelBalanceDustLimit tests the condition when the remaining balance
// for one of the channel participants is so small as to be considered dust. In
// this case, the output for that participant is removed and all funds (minus
// fees) in the commitment transaction are allocated to the remaining channel
// participant.
//
// TODO(roasbeef): test needs to be fixed after reserve limits are done
func TestChannelBalanceDustLimit(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// To allow Alice's balance to get beneath her dust limit, set the
// channel reserve to be 0.
aliceChannel.channelState.LocalChanCfg.ChanReserve = 0
bobChannel.channelState.RemoteChanCfg.ChanReserve = 0
// This amount should leave an amount larger than Alice's dust limit
// once fees have been subtracted, but smaller than Bob's dust limit.
// We account in fees for the HTLC we will be adding.
defaultFee := calcStaticFee(channeldb.SingleFunderTweaklessBit, 1)
aliceBalance := aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis()
htlcSat := aliceBalance - defaultFee
htlcSat += HtlcSuccessFee(
aliceChannel.channelState.ChanType,
chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
),
)
htlcAmount := lnwire.NewMSatFromSatoshis(htlcSat)
htlc, preimage := createHTLC(0, htlcAmount)
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("bob unable to receive htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("state transition error: %v", err)
}
err = bobChannel.SettleHTLC(preimage, bobHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preimage, aliceHtlcIndex)
if err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("state transition error: %v", err)
}
// At the conclusion of this test, in Bob's commitment chains, the
// output for Alice's balance should have been removed as dust, leaving
// only a single output that will send the remaining funds in the
// channel to Bob.
commitment := bobChannel.localCommitChain.tip()
if len(commitment.txn.TxOut) != 1 {
t.Fatalf("incorrect # of outputs: expected %v, got %v",
1, len(commitment.txn.TxOut))
}
if aliceChannel.channelState.TotalMSatSent != htlcAmount {
t.Fatalf("alice satoshis sent incorrect: expected %v, got %v",
htlcAmount, aliceChannel.channelState.TotalMSatSent)
}
}
func TestStateUpdatePersistence(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
htlcAmt := lnwire.NewMSatFromSatoshis(5000)
var fakeOnionBlob [lnwire.OnionPacketSize]byte
copy(fakeOnionBlob[:], bytes.Repeat([]byte{0x05}, lnwire.OnionPacketSize))
// Alice adds 3 HTLCs to the update log, while Bob adds a single HTLC.
var alicePreimage [32]byte
copy(alicePreimage[:], bytes.Repeat([]byte{0xaa}, 32))
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xbb}, 32))
for i := 0; i < 3; i++ {
rHash := sha256.Sum256(alicePreimage[:])
h := &lnwire.UpdateAddHTLC{
ID: uint64(i),
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
}
if _, err := aliceChannel.AddHTLC(h, nil); err != nil {
t.Fatalf("unable to add alice's htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(h); err != nil {
t.Fatalf("unable to recv alice's htlc: %v", err)
}
}
rHash := sha256.Sum256(bobPreimage[:])
bobh := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
}
if _, err := bobChannel.AddHTLC(bobh, nil); err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
if _, err := aliceChannel.ReceiveHTLC(bobh); err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
// Also add a fee update to the update logs.
fee := chainfee.SatPerKWeight(333)
if err := aliceChannel.UpdateFee(fee); err != nil {
t.Fatalf("unable to send fee update")
}
if err := bobChannel.ReceiveUpdateFee(fee); err != nil {
t.Fatalf("unable to receive fee update")
}
// Helper method that asserts the expected number of updates are found
// in the update logs.
assertNumLogUpdates := func(numAliceUpdates, numBobUpdates int) {
if aliceChannel.localUpdateLog.Len() != numAliceUpdates {
t.Fatalf("expected %d local updates, found %d",
numAliceUpdates,
aliceChannel.localUpdateLog.Len())
}
if aliceChannel.remoteUpdateLog.Len() != numBobUpdates {
t.Fatalf("expected %d remote updates, found %d",
numBobUpdates,
aliceChannel.remoteUpdateLog.Len())
}
if bobChannel.localUpdateLog.Len() != numBobUpdates {
t.Fatalf("expected %d local updates, found %d",
numBobUpdates,
bobChannel.localUpdateLog.Len())
}
if bobChannel.remoteUpdateLog.Len() != numAliceUpdates {
t.Fatalf("expected %d remote updates, found %d",
numAliceUpdates,
bobChannel.remoteUpdateLog.Len())
}
}
// Both nodes should now have Alice's 3 Adds and 1 FeeUpdate in the
// log, and Bob's 1 Add.
assertNumLogUpdates(4, 1)
// Next, Alice initiates a state transition to include the HTLC's she
// added above in a new commitment state.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state transition: %v", err)
}
// Since the HTLC Bob sent wasn't included in Bob's version of the
// commitment transaction (but it was in Alice's, as he ACK'd her
// changes before creating a new state), Bob needs to trigger another
// state update in order to re-sync their states.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// After the state transition the fee update is fully locked in, and
// should've been removed from both channels' update logs.
if aliceChannel.localCommitChain.tail().feePerKw != fee {
t.Fatalf("fee not locked in")
}
if bobChannel.localCommitChain.tail().feePerKw != fee {
t.Fatalf("fee not locked in")
}
assertNumLogUpdates(3, 1)
// The latest commitment from both sides should have all the HTLCs.
numAliceOutgoing := aliceChannel.localCommitChain.tail().outgoingHTLCs
numAliceIncoming := aliceChannel.localCommitChain.tail().incomingHTLCs
if len(numAliceOutgoing) != 3 {
t.Fatalf("expected %v htlcs, instead got %v", 3, numAliceOutgoing)
}
if len(numAliceIncoming) != 1 {
t.Fatalf("expected %v htlcs, instead got %v", 1, numAliceIncoming)
}
numBobOutgoing := bobChannel.localCommitChain.tail().outgoingHTLCs
numBobIncoming := bobChannel.localCommitChain.tail().incomingHTLCs
if len(numBobOutgoing) != 1 {
t.Fatalf("expected %v htlcs, instead got %v", 1, numBobOutgoing)
}
if len(numBobIncoming) != 3 {
t.Fatalf("expected %v htlcs, instead got %v", 3, numBobIncoming)
}
// TODO(roasbeef): also ensure signatures were stored
// * ensure expiry matches
// Now fetch both of the channels created above from disk to simulate a
// node restart with persistence.
alicePub := aliceChannel.channelState.IdentityPub
aliceChannels, err := aliceChannel.channelState.Db.FetchOpenChannels(
alicePub,
)
if err != nil {
t.Fatalf("unable to fetch channel: %v", err)
}
bobPub := bobChannel.channelState.IdentityPub
bobChannels, err := bobChannel.channelState.Db.FetchOpenChannels(bobPub)
if err != nil {
t.Fatalf("unable to fetch channel: %v", err)
}
aliceChannelNew, err := NewLightningChannel(
aliceChannel.Signer, aliceChannels[0], aliceChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
bobChannelNew, err := NewLightningChannel(
bobChannel.Signer, bobChannels[0], bobChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
// The state update logs of the new channels and the old channels
// should now be identical other than the height the HTLCs were added.
if aliceChannel.localUpdateLog.logIndex !=
aliceChannelNew.localUpdateLog.logIndex {
t.Fatalf("alice log counter: expected %v, got %v",
aliceChannel.localUpdateLog.logIndex,
aliceChannelNew.localUpdateLog.logIndex)
}
if aliceChannel.remoteUpdateLog.logIndex !=
aliceChannelNew.remoteUpdateLog.logIndex {
t.Fatalf("alice log counter: expected %v, got %v",
aliceChannel.remoteUpdateLog.logIndex,
aliceChannelNew.remoteUpdateLog.logIndex)
}
if aliceChannel.localUpdateLog.Len() !=
aliceChannelNew.localUpdateLog.Len() {
t.Fatalf("alice log len: expected %v, got %v",
aliceChannel.localUpdateLog.Len(),
aliceChannelNew.localUpdateLog.Len())
}
if aliceChannel.remoteUpdateLog.Len() !=
aliceChannelNew.remoteUpdateLog.Len() {
t.Fatalf("alice log len: expected %v, got %v",
aliceChannel.remoteUpdateLog.Len(),
aliceChannelNew.remoteUpdateLog.Len())
}
if bobChannel.localUpdateLog.logIndex !=
bobChannelNew.localUpdateLog.logIndex {
t.Fatalf("bob log counter: expected %v, got %v",
bobChannel.localUpdateLog.logIndex,
bobChannelNew.localUpdateLog.logIndex)
}
if bobChannel.remoteUpdateLog.logIndex !=
bobChannelNew.remoteUpdateLog.logIndex {
t.Fatalf("bob log counter: expected %v, got %v",
bobChannel.remoteUpdateLog.logIndex,
bobChannelNew.remoteUpdateLog.logIndex)
}
if bobChannel.localUpdateLog.Len() !=
bobChannelNew.localUpdateLog.Len() {
t.Fatalf("bob log len: expected %v, got %v",
bobChannel.localUpdateLog.Len(),
bobChannelNew.localUpdateLog.Len())
}
if bobChannel.remoteUpdateLog.Len() !=
bobChannelNew.remoteUpdateLog.Len() {
t.Fatalf("bob log len: expected %v, got %v",
bobChannel.remoteUpdateLog.Len(),
bobChannelNew.remoteUpdateLog.Len())
}
// TODO(roasbeef): expand test to also ensure state revocation log has
// proper pk scripts
// Newly generated pkScripts for HTLCs should be the same as in the old channel.
for _, entry := range aliceChannel.localUpdateLog.htlcIndex {
htlc := entry.Value.(*PaymentDescriptor)
restoredHtlc := aliceChannelNew.localUpdateLog.lookupHtlc(htlc.HtlcIndex)
if !bytes.Equal(htlc.ourPkScript, restoredHtlc.ourPkScript) {
t.Fatalf("alice ourPkScript in ourLog: expected %X, got %X",
htlc.ourPkScript[:5], restoredHtlc.ourPkScript[:5])
}
if !bytes.Equal(htlc.theirPkScript, restoredHtlc.theirPkScript) {
t.Fatalf("alice theirPkScript in ourLog: expected %X, got %X",
htlc.theirPkScript[:5], restoredHtlc.theirPkScript[:5])
}
}
for _, entry := range aliceChannel.remoteUpdateLog.htlcIndex {
htlc := entry.Value.(*PaymentDescriptor)
restoredHtlc := aliceChannelNew.remoteUpdateLog.lookupHtlc(htlc.HtlcIndex)
if !bytes.Equal(htlc.ourPkScript, restoredHtlc.ourPkScript) {
t.Fatalf("alice ourPkScript in theirLog: expected %X, got %X",
htlc.ourPkScript[:5], restoredHtlc.ourPkScript[:5])
}
if !bytes.Equal(htlc.theirPkScript, restoredHtlc.theirPkScript) {
t.Fatalf("alice theirPkScript in theirLog: expected %X, got %X",
htlc.theirPkScript[:5], restoredHtlc.theirPkScript[:5])
}
}
for _, entry := range bobChannel.localUpdateLog.htlcIndex {
htlc := entry.Value.(*PaymentDescriptor)
restoredHtlc := bobChannelNew.localUpdateLog.lookupHtlc(htlc.HtlcIndex)
if !bytes.Equal(htlc.ourPkScript, restoredHtlc.ourPkScript) {
t.Fatalf("bob ourPkScript in ourLog: expected %X, got %X",
htlc.ourPkScript[:5], restoredHtlc.ourPkScript[:5])
}
if !bytes.Equal(htlc.theirPkScript, restoredHtlc.theirPkScript) {
t.Fatalf("bob theirPkScript in ourLog: expected %X, got %X",
htlc.theirPkScript[:5], restoredHtlc.theirPkScript[:5])
}
}
for _, entry := range bobChannel.remoteUpdateLog.htlcIndex {
htlc := entry.Value.(*PaymentDescriptor)
restoredHtlc := bobChannelNew.remoteUpdateLog.lookupHtlc(htlc.HtlcIndex)
if !bytes.Equal(htlc.ourPkScript, restoredHtlc.ourPkScript) {
t.Fatalf("bob ourPkScript in theirLog: expected %X, got %X",
htlc.ourPkScript[:5], restoredHtlc.ourPkScript[:5])
}
if !bytes.Equal(htlc.theirPkScript, restoredHtlc.theirPkScript) {
t.Fatalf("bob theirPkScript in theirLog: expected %X, got %X",
htlc.theirPkScript[:5], restoredHtlc.theirPkScript[:5])
}
}
// Now settle all the HTLCs, then force a state update. The state
// update should succeed as both sides have identical.
for i := 0; i < 3; i++ {
err := bobChannelNew.SettleHTLC(alicePreimage, uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc #%v: %v", i, err)
}
err = aliceChannelNew.ReceiveHTLCSettle(alicePreimage, uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc#%v: %v", i, err)
}
}
err = aliceChannelNew.SettleHTLC(bobPreimage, 0, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannelNew.ReceiveHTLCSettle(bobPreimage, 0)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
// Similar to the two transitions above, as both Bob and Alice added
// entries to the update log before a state transition was initiated by
// either side, both sides are required to trigger an update in order
// to lock in their changes.
if err := ForceStateTransition(aliceChannelNew, bobChannelNew); err != nil {
t.Fatalf("unable to update commitments: %v", err)
}
if err := ForceStateTransition(bobChannelNew, aliceChannelNew); err != nil {
t.Fatalf("unable to update commitments: %v", err)
}
// The amounts transferred should been updated as per the amounts in
// the HTLCs
if aliceChannelNew.channelState.TotalMSatSent != htlcAmt*3 {
t.Fatalf("expected %v alice satoshis sent, got %v",
htlcAmt*3, aliceChannelNew.channelState.TotalMSatSent)
}
if aliceChannelNew.channelState.TotalMSatReceived != htlcAmt {
t.Fatalf("expected %v alice satoshis received, got %v",
htlcAmt, aliceChannelNew.channelState.TotalMSatReceived)
}
if bobChannelNew.channelState.TotalMSatSent != htlcAmt {
t.Fatalf("expected %v bob satoshis sent, got %v",
htlcAmt, bobChannel.channelState.TotalMSatSent)
}
if bobChannelNew.channelState.TotalMSatReceived != htlcAmt*3 {
t.Fatalf("expected %v bob satoshis sent, got %v",
htlcAmt*3, bobChannel.channelState.TotalMSatReceived)
}
// As a final test, we'll ensure that the HTLC counters for both sides
// has been persisted properly. If we instruct Alice to add a new HTLC,
// it should have an index of 3. If we instruct Bob to do the
// same, it should have an index of 1.
aliceHtlcIndex, err := aliceChannel.AddHTLC(bobh, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if aliceHtlcIndex != 3 {
t.Fatalf("wrong htlc index: expected %v, got %v", 3, aliceHtlcIndex)
}
bobHtlcIndex, err := bobChannel.AddHTLC(bobh, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if bobHtlcIndex != 1 {
t.Fatalf("wrong htlc index: expected %v, got %v", 1, aliceHtlcIndex)
}
}
func TestCancelHTLC(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Add a new HTLC from Alice to Bob, then trigger a new state
// transition in order to include it in the latest state.
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
var preImage [32]byte
copy(preImage[:], bytes.Repeat([]byte{0xaa}, 32))
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: sha256.Sum256(preImage[:]),
Amount: htlcAmt,
Expiry: 10,
}
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("unable to add alice htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("unable to add bob htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to create new commitment state: %v", err)
}
// With the HTLC committed, Alice's balance should reflect the clearing
// of the new HTLC.
aliceExpectedBalance := btcutil.Amount(btcutil.SatoshiPerBitcoin*4) -
calcStaticFee(channeldb.SingleFunderTweaklessBit, 1)
if aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis() !=
aliceExpectedBalance {
t.Fatalf("Alice's balance is wrong: expected %v, got %v",
aliceExpectedBalance,
aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis())
}
// Now, with the HTLC committed on both sides, trigger a cancellation
// from Bob to Alice, removing the HTLC.
err = bobChannel.FailHTLC(bobHtlcIndex, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(aliceHtlcIndex, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// Now trigger another state transition, the HTLC should now be removed
// from both sides, with balances reflected.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to create new commitment: %v", err)
}
// Now HTLCs should be present on the commitment transaction for either
// side.
if len(aliceChannel.localCommitChain.tip().outgoingHTLCs) != 0 ||
len(aliceChannel.remoteCommitChain.tip().outgoingHTLCs) != 0 {
t.Fatalf("htlc's still active from alice's POV")
}
if len(aliceChannel.localCommitChain.tip().incomingHTLCs) != 0 ||
len(aliceChannel.remoteCommitChain.tip().incomingHTLCs) != 0 {
t.Fatalf("htlc's still active from alice's POV")
}
if len(bobChannel.localCommitChain.tip().outgoingHTLCs) != 0 ||
len(bobChannel.remoteCommitChain.tip().outgoingHTLCs) != 0 {
t.Fatalf("htlc's still active from bob's POV")
}
if len(bobChannel.localCommitChain.tip().incomingHTLCs) != 0 ||
len(bobChannel.remoteCommitChain.tip().incomingHTLCs) != 0 {
t.Fatalf("htlc's still active from bob's POV")
}
expectedBalance := btcutil.Amount(btcutil.SatoshiPerBitcoin * 5)
staticFee := calcStaticFee(channeldb.SingleFunderTweaklessBit, 0)
if aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis() !=
expectedBalance-staticFee {
t.Fatalf("balance is wrong: expected %v, got %v",
aliceChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis(),
expectedBalance-staticFee)
}
if aliceChannel.channelState.LocalCommitment.RemoteBalance.ToSatoshis() !=
expectedBalance {
t.Fatalf("balance is wrong: expected %v, got %v",
aliceChannel.channelState.LocalCommitment.RemoteBalance.ToSatoshis(),
expectedBalance)
}
if bobChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis() !=
expectedBalance {
t.Fatalf("balance is wrong: expected %v, got %v",
bobChannel.channelState.LocalCommitment.LocalBalance.ToSatoshis(),
expectedBalance)
}
if bobChannel.channelState.LocalCommitment.RemoteBalance.ToSatoshis() !=
expectedBalance-staticFee {
t.Fatalf("balance is wrong: expected %v, got %v",
bobChannel.channelState.LocalCommitment.RemoteBalance.ToSatoshis(),
expectedBalance-staticFee)
}
}
func TestCooperativeCloseDustAdherence(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
aliceFeeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
bobFeeRate := chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
)
setDustLimit := func(dustVal btcutil.Amount) {
aliceChannel.channelState.LocalChanCfg.DustLimit = dustVal
aliceChannel.channelState.RemoteChanCfg.DustLimit = dustVal
bobChannel.channelState.LocalChanCfg.DustLimit = dustVal
bobChannel.channelState.RemoteChanCfg.DustLimit = dustVal
}
resetChannelState := func() {
aliceChannel.status = channelOpen
bobChannel.status = channelOpen
}
setBalances := func(aliceBalance, bobBalance lnwire.MilliSatoshi) {
aliceChannel.channelState.LocalCommitment.LocalBalance = aliceBalance
aliceChannel.channelState.LocalCommitment.RemoteBalance = bobBalance
bobChannel.channelState.LocalCommitment.LocalBalance = bobBalance
bobChannel.channelState.LocalCommitment.RemoteBalance = aliceBalance
}
aliceDeliveryScript := bobsPrivKey[:]
bobDeliveryScript := testHdSeed[:]
// We'll start be initializing the limit of both Alice and Bob to 10k
// satoshis.
dustLimit := btcutil.Amount(10000)
setDustLimit(dustLimit)
// Both sides currently have over 1 BTC settled as part of their
// balances. As a result, performing a cooperative closure now result
// in both sides having an output within the closure transaction.
aliceFee := btcutil.Amount(aliceChannel.CalcFee(aliceFeeRate)) + 1000
aliceSig, _, _, err := aliceChannel.CreateCloseProposal(
aliceFee, aliceDeliveryScript, bobDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
bobFee := btcutil.Amount(bobChannel.CalcFee(bobFeeRate)) + 1000
bobSig, _, _, err := bobChannel.CreateCloseProposal(
bobFee, bobDeliveryScript, aliceDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
closeTx, _, err := bobChannel.CompleteCooperativeClose(
bobSig, aliceSig, bobDeliveryScript, aliceDeliveryScript,
bobFee,
)
if err != nil {
t.Fatalf("unable to accept channel close: %v", err)
}
// The closure transaction should have exactly two outputs.
if len(closeTx.TxOut) != 2 {
t.Fatalf("close tx has wrong number of outputs: expected %v "+
"got %v", 2, len(closeTx.TxOut))
}
// We'll reset the channel states before proceeding to our next test.
resetChannelState()
// Next we'll modify the current balances and dust limits such that
// Bob's current balance is _below_ his dust limit.
aliceBal := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
bobBal := lnwire.NewMSatFromSatoshis(250)
setBalances(aliceBal, bobBal)
// Attempt another cooperative channel closure. It should succeed
// without any issues.
aliceSig, _, _, err = aliceChannel.CreateCloseProposal(
aliceFee, aliceDeliveryScript, bobDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
bobSig, _, _, err = bobChannel.CreateCloseProposal(
bobFee, bobDeliveryScript, aliceDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
closeTx, _, err = bobChannel.CompleteCooperativeClose(
bobSig, aliceSig, bobDeliveryScript, aliceDeliveryScript,
bobFee,
)
if err != nil {
t.Fatalf("unable to accept channel close: %v", err)
}
// The closure transaction should only have a single output, and that
// output should be Alice's balance.
if len(closeTx.TxOut) != 1 {
t.Fatalf("close tx has wrong number of outputs: expected %v "+
"got %v", 1, len(closeTx.TxOut))
}
commitFee := aliceChannel.channelState.LocalCommitment.CommitFee
aliceExpectedBalance := aliceBal.ToSatoshis() - aliceFee + commitFee
if closeTx.TxOut[0].Value != int64(aliceExpectedBalance) {
t.Fatalf("alice's balance is incorrect: expected %v, got %v",
aliceExpectedBalance,
int64(closeTx.TxOut[0].Value))
}
// We'll modify the current balances and dust limits such that
// Alice's current balance is too low to pay the proposed fee.
setBalances(bobBal, aliceBal)
resetChannelState()
// Attempting to close with this fee now should fail, since Alice
// cannot afford it.
_, _, _, err = aliceChannel.CreateCloseProposal(
aliceFee, aliceDeliveryScript, bobDeliveryScript,
)
if err == nil {
t.Fatalf("expected error")
}
// Finally, we'll modify the current balances and dust limits such that
// Alice's balance after paying the coop fee is _below_ her dust limit.
lowBalance := lnwire.NewMSatFromSatoshis(aliceFee) + 1000
setBalances(lowBalance, aliceBal)
resetChannelState()
// Our final attempt at another cooperative channel closure. It should
// succeed without any issues.
aliceSig, _, _, err = aliceChannel.CreateCloseProposal(
aliceFee, aliceDeliveryScript, bobDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
bobSig, _, _, err = bobChannel.CreateCloseProposal(
bobFee, bobDeliveryScript, aliceDeliveryScript,
)
if err != nil {
t.Fatalf("unable to close channel: %v", err)
}
closeTx, _, err = bobChannel.CompleteCooperativeClose(
bobSig, aliceSig, bobDeliveryScript, aliceDeliveryScript,
bobFee,
)
if err != nil {
t.Fatalf("unable to accept channel close: %v", err)
}
// The closure transaction should only have a single output, and that
// output should be Bob's balance.
if len(closeTx.TxOut) != 1 {
t.Fatalf("close tx has wrong number of outputs: expected %v "+
"got %v", 1, len(closeTx.TxOut))
}
if closeTx.TxOut[0].Value != int64(aliceBal.ToSatoshis()) {
t.Fatalf("bob's balance is incorrect: expected %v, got %v",
aliceBal.ToSatoshis(), closeTx.TxOut[0].Value)
}
}
// TestUpdateFeeAdjustments tests that the state machine is able to properly
// accept valid fee changes, as well as reject any invalid fee updates.
func TestUpdateFeeAdjustments(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll grab the current base fee rate as we'll be using this
// to make relative adjustments int he fee rate.
baseFeeRate := aliceChannel.channelState.LocalCommitment.FeePerKw
// We'll first try to increase the fee rate 5x, this should be able to
// be committed without any issue.
newFee := chainfee.SatPerKWeight(baseFeeRate * 5)
if err := aliceChannel.UpdateFee(newFee); err != nil {
t.Fatalf("unable to alice update fee: %v", err)
}
if err := bobChannel.ReceiveUpdateFee(newFee); err != nil {
t.Fatalf("unable to bob update fee: %v", err)
}
// With the fee updates applied, we'll now initiate a state transition
// to ensure the fee update is locked in.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to create new commitment: %v", err)
}
// We'll now attempt to increase the fee rate 1,000,000x of the base
// fee. This should result in an error as Alice won't be able to pay
// this new fee rate.
newFee = chainfee.SatPerKWeight(baseFeeRate * 1000000)
if err := aliceChannel.UpdateFee(newFee); err == nil {
t.Fatalf("alice should reject the fee rate")
}
// Finally, we'll attempt to adjust the fee down and use a fee which is
// smaller than the initial base fee rate. The fee application and
// state transition should proceed without issue.
newFee = chainfee.SatPerKWeight(baseFeeRate / 10)
if err := aliceChannel.UpdateFee(newFee); err != nil {
t.Fatalf("unable to alice update fee: %v", err)
}
if err := bobChannel.ReceiveUpdateFee(newFee); err != nil {
t.Fatalf("unable to bob update fee: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to create new commitment: %v", err)
}
}
// TestUpdateFeeFail tests that the signature verification will fail if they
// fee updates are out of sync.
func TestUpdateFeeFail(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Bob receives the update, that will apply to his commitment
// transaction.
if err := bobChannel.ReceiveUpdateFee(333); err != nil {
t.Fatalf("unable to apply fee update: %v", err)
}
// Alice sends signature for commitment that does not cover any fee
// update.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Bob verifies this commit, meaning that he checks that it is
// consistent everything he has received. This should fail, since he got
// the fee update, but Alice never sent it.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err == nil {
t.Fatalf("expected bob to fail receiving alice's signature")
}
}
// TestUpdateFeeConcurrentSig tests that the channel can properly handle a fee
// update that it receives concurrently with signing its next commitment.
func TestUpdateFeeConcurrentSig(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
paymentPreimage := bytes.Repeat([]byte{1}, 32)
paymentHash := sha256.Sum256(paymentPreimage)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: btcutil.SatoshiPerBitcoin,
Expiry: uint32(5),
}
// First Alice adds the outgoing HTLC to her local channel's state
// update log. Then Alice sends this wire message over to Bob who
// adds this htlc to his remote state update log.
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Simulate Alice sending update fee message to bob.
fee := chainfee.SatPerKWeight(333)
if err := aliceChannel.UpdateFee(fee); err != nil {
t.Fatalf("unable to send fee update")
}
// Alice signs a commitment, and sends this to bob.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// At the same time, Bob signs a commitment.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign alice's commitment: %v", err)
}
// ...that Alice receives.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
// Now let Bob receive the fee update + commitment that Alice sent.
if err := bobChannel.ReceiveUpdateFee(fee); err != nil {
t.Fatalf("unable to receive fee update")
}
// Bob receives this signature message, and verifies that it is
// consistent with the state he had for Alice, including the received
// HTLC and fee update.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
if chainfee.SatPerKWeight(bobChannel.channelState.LocalCommitment.FeePerKw) == fee {
t.Fatalf("bob's feePerKw was unexpectedly locked in")
}
// Bob can revoke the prior commitment he had. This should lock in the
// fee update for him.
_, _, err = bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
if chainfee.SatPerKWeight(bobChannel.channelState.LocalCommitment.FeePerKw) != fee {
t.Fatalf("bob's feePerKw was not locked in")
}
}
// TestUpdateFeeSenderCommits verifies that the state machine progresses as
// expected if we send a fee update, and then the sender of the fee update
// sends a commitment signature.
func TestUpdateFeeSenderCommits(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
paymentPreimage := bytes.Repeat([]byte{1}, 32)
paymentHash := sha256.Sum256(paymentPreimage)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: btcutil.SatoshiPerBitcoin,
Expiry: uint32(5),
}
// First Alice adds the outgoing HTLC to her local channel's state
// update log. Then Alice sends this wire message over to Bob who
// adds this htlc to his remote state update log.
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Simulate Alice sending update fee message to bob.
fee := chainfee.SatPerKWeight(333)
aliceChannel.UpdateFee(fee)
bobChannel.ReceiveUpdateFee(fee)
// Alice signs a commitment, which will cover everything sent to Bob
// (the HTLC and the fee update), and everything acked by Bob (nothing
// so far).
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Bob receives this signature message, and verifies that it is
// consistent with the state he had for Alice, including the received
// HTLC and fee update.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("bob's feePerKw was unexpectedly locked in")
}
// Bob can revoke the prior commitment he had. This should lock in the
// fee update for him.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("bob's feePerKw was not locked in")
}
// Bob commits to all updates he has received from Alice. This includes
// the HTLC he received, and the fee update.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign alice's commitment: %v", err)
}
// Alice receives the revocation of the old one, and can now assume
// that Bob's received everything up to the signature she sent,
// including the HTLC and fee update.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to process bob's revocation: %v", err)
}
// Alice receives new signature from Bob, and assumes this covers the
// changes.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("alice's feePerKw was unexpectedly locked in")
}
// Alice can revoke the old commitment, which will lock in the fee
// update.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke alice channel: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("alice's feePerKw was not locked in")
}
// Bob receives revocation from Alice.
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
}
// TestUpdateFeeReceiverCommits tests that the state machine progresses as
// expected if we send a fee update, and then the receiver of the fee update
// sends a commitment signature.
func TestUpdateFeeReceiverCommits(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
paymentPreimage := bytes.Repeat([]byte{1}, 32)
paymentHash := sha256.Sum256(paymentPreimage)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: btcutil.SatoshiPerBitcoin,
Expiry: uint32(5),
}
// First Alice adds the outgoing HTLC to her local channel's state
// update log. Then Alice sends this wire message over to Bob who
// adds this htlc to his remote state update log.
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Simulate Alice sending update fee message to bob
fee := chainfee.SatPerKWeight(333)
aliceChannel.UpdateFee(fee)
bobChannel.ReceiveUpdateFee(fee)
// Bob commits to every change he has sent since last time (none). He
// does not commit to the received HTLC and fee update, since Alice
// cannot know if he has received them.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Alice receives this signature message, and verifies that it is
// consistent with the remote state, not including any of the updates.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
// Alice can revoke the prior commitment she had, this will ack
// everything received before last commitment signature, but in this
// case that is nothing.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
// Bob receives the revocation of the old commitment
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("alice unable to process bob's revocation: %v", err)
}
// Alice will sign next commitment. Since she sent the revocation, she
// also ack'ed everything received, but in this case this is nothing.
// Since she sent the two updates, this signature will cover those two.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign alice's commitment: %v", err)
}
// Bob gets the signature for the new commitment from Alice. He assumes
// this covers everything received from alice, including the two updates.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("bob's feePerKw was unexpectedly locked in")
}
// Bob can revoke the old commitment. This will ack what he has
// received, including the HTLC and fee update. This will lock in the
// fee update for bob.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke alice channel: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("bob's feePerKw was not locked in")
}
// Bob will send a new signature, which will cover what he just acked:
// the HTLC and fee update.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Alice receives revocation from Bob, and can now be sure that Bob
// received the two updates, and they are considered locked in.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
// Alice will receive the signature from Bob, which will cover what was
// just acked by his revocation.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("alice's feePerKw was unexpectedly locked in")
}
// After Alice now revokes her old commitment, the fee update should
// lock in.
aliceRevocation, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("Alice's feePerKw was not locked in")
}
// Bob receives revocation from Alice.
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
}
// TestUpdateFeeReceiverSendsUpdate tests that receiving a fee update as channel
// initiator fails, and that trying to initiate fee update as non-initiation
// fails.
func TestUpdateFeeReceiverSendsUpdate(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Since Alice is the channel initiator, she should fail when receiving
// fee update
fee := chainfee.SatPerKWeight(333)
err = aliceChannel.ReceiveUpdateFee(fee)
if err == nil {
t.Fatalf("expected alice to fail receiving fee update")
}
// Similarly, initiating fee update should fail for Bob.
err = bobChannel.UpdateFee(fee)
if err == nil {
t.Fatalf("expected bob to fail initiating fee update")
}
}
// Test that if multiple update fee messages are sent consecutively, then the
// last one is the one that is being committed to.
func TestUpdateFeeMultipleUpdates(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Simulate Alice sending update fee message to bob.
fee1 := chainfee.SatPerKWeight(333)
fee2 := chainfee.SatPerKWeight(333)
fee := chainfee.SatPerKWeight(333)
aliceChannel.UpdateFee(fee1)
aliceChannel.UpdateFee(fee2)
aliceChannel.UpdateFee(fee)
// Alice signs a commitment, which will cover everything sent to Bob
// (the HTLC and the fee update), and everything acked by Bob (nothing
// so far).
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
bobChannel.ReceiveUpdateFee(fee1)
bobChannel.ReceiveUpdateFee(fee2)
bobChannel.ReceiveUpdateFee(fee)
// Bob receives this signature message, and verifies that it is
// consistent with the state he had for Alice, including the received
// HTLC and fee update.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("bob's feePerKw was unexpectedly locked in")
}
// Alice sending more fee updates now should not mess up the old fee
// they both committed to.
fee3 := chainfee.SatPerKWeight(444)
fee4 := chainfee.SatPerKWeight(555)
fee5 := chainfee.SatPerKWeight(666)
aliceChannel.UpdateFee(fee3)
aliceChannel.UpdateFee(fee4)
aliceChannel.UpdateFee(fee5)
bobChannel.ReceiveUpdateFee(fee3)
bobChannel.ReceiveUpdateFee(fee4)
bobChannel.ReceiveUpdateFee(fee5)
// Bob can revoke the prior commitment he had. This should lock in the
// fee update for him.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to generate bob revocation: %v", err)
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("bob's feePerKw was not locked in")
}
// Bob commits to all updates he has received from Alice. This includes
// the HTLC he received, and the fee update.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign alice's commitment: %v", err)
}
// Alice receives the revocation of the old one, and can now assume that
// Bob's received everything up to the signature she sent, including the
// HTLC and fee update.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to process bob's revocation: %v", err)
}
// Alice receives new signature from Bob, and assumes this covers the
// changes.
if err := aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs); err != nil {
t.Fatalf("alice unable to process bob's new commitment: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) == fee {
t.Fatalf("alice's feePerKw was unexpectedly locked in")
}
// Alice can revoke the old commitment, which will lock in the fee
// update.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke alice channel: %v", err)
}
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != fee {
t.Fatalf("alice's feePerKw was not locked in")
}
// Bob receives revocation from Alice.
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
}
// TestAddHTLCNegativeBalance tests that if enough HTLC's are added to the
// state machine to drive the balance to zero, then the next HTLC attempted to
// be added will result in an error being returned.
func TestAddHTLCNegativeBalance(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We set the channel reserve to 0, such that we can add HTLCs all the
// way to a negative balance.
aliceChannel.channelState.LocalChanCfg.ChanReserve = 0
// First, we'll add 3 HTLCs of 1 BTC each to Alice's commitment.
const numHTLCs = 3
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
for i := 0; i < numHTLCs; i++ {
htlc, _ := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
}
// Alice now has an available balance of 2 BTC. We'll add a new HTLC of
// value 2 BTC, which should make Alice's balance negative (since she
// has to pay a commitment fee).
htlcAmt = lnwire.NewMSatFromSatoshis(2 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(numHTLCs+1, htlcAmt)
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected balance below channel reserve, instead "+
"got: %v", err)
}
}
// assertNoChanSyncNeeded is a helper function that asserts that upon restart,
// two channels conclude that they're fully synchronized and don't need to
// retransmit any new messages.
func assertNoChanSyncNeeded(t *testing.T, aliceChannel *LightningChannel,
bobChannel *LightningChannel) {
_, _, line, _ := runtime.Caller(1)
aliceChanSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("line #%v: unable to produce chan sync msg: %v",
line, err)
}
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceChanSyncMsg)
if err != nil {
t.Fatalf("line #%v: unable to process ChannelReestablish "+
"msg: %v", line, err)
}
if len(bobMsgsToSend) != 0 {
t.Fatalf("line #%v: bob shouldn't have to send any messages, "+
"instead wants to send: %v", line, spew.Sdump(bobMsgsToSend))
}
bobChanSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("line #%v: unable to produce chan sync msg: %v",
line, err)
}
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(bobChanSyncMsg)
if err != nil {
t.Fatalf("line #%v: unable to process ChannelReestablish "+
"msg: %v", line, err)
}
if len(bobMsgsToSend) != 0 {
t.Fatalf("line #%v: alice shouldn't have to send any "+
"messages, instead wants to send: %v", line,
spew.Sdump(aliceMsgsToSend))
}
}
// TestChanSyncFullySynced tests that after a successful commitment exchange,
// and a forced restart, both nodes conclude that they're fully synchronized
// and don't need to retransmit any messages.
func TestChanSyncFullySynced(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// If we exchange channel sync messages from the get-go , then both
// sides should conclude that no further synchronization is needed.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// Next, we'll create an HTLC for Alice to extend to Bob.
var paymentPreimage [32]byte
copy(paymentPreimage[:], bytes.Repeat([]byte{1}, 32))
paymentHash := sha256.Sum256(paymentPreimage[:])
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: htlcAmt,
Expiry: uint32(5),
}
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Then we'll initiate a state transition to lock in this new HTLC.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state transition: %v", err)
}
// At this point, if both sides generate a ChannelReestablish message,
// they should both conclude that they're fully in sync.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// If bob settles the HTLC, and then initiates a state transition, they
// should both still think that they're in sync.
err = bobChannel.SettleHTLC(paymentPreimage, bobHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(paymentPreimage, aliceHtlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
// Next, we'll complete Bob's state transition, and assert again that
// they think they're fully synced.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// Finally, if we simulate a restart on both sides, then both should
// still conclude that they don't need to synchronize their state.
alicePub := aliceChannel.channelState.IdentityPub
aliceChannels, err := aliceChannel.channelState.Db.FetchOpenChannels(
alicePub,
)
if err != nil {
t.Fatalf("unable to fetch channel: %v", err)
}
bobPub := bobChannel.channelState.IdentityPub
bobChannels, err := bobChannel.channelState.Db.FetchOpenChannels(bobPub)
if err != nil {
t.Fatalf("unable to fetch channel: %v", err)
}
aliceChannelNew, err := NewLightningChannel(
aliceChannel.Signer, aliceChannels[0], aliceChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
bobChannelNew, err := NewLightningChannel(
bobChannel.Signer, bobChannels[0], bobChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
assertNoChanSyncNeeded(t, aliceChannelNew, bobChannelNew)
}
// restartChannel reads the passed channel from disk, and returns a newly
// initialized instance. This simulates one party restarting and losing their
// in memory state.
func restartChannel(channelOld *LightningChannel) (*LightningChannel, error) {
nodePub := channelOld.channelState.IdentityPub
nodeChannels, err := channelOld.channelState.Db.FetchOpenChannels(
nodePub,
)
if err != nil {
return nil, err
}
channelNew, err := NewLightningChannel(
channelOld.Signer, nodeChannels[0],
channelOld.sigPool,
)
if err != nil {
return nil, err
}
return channelNew, nil
}
// TestChanSyncOweCommitment tests that if Bob restarts (and then Alice) before
// he receives Alice's CommitSig message, then Alice concludes that she needs
// to re-send the CommitDiff. After the diff has been sent, both nodes should
// resynchronize and be able to complete the dangling commit.
func TestChanSyncOweCommitment(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
var fakeOnionBlob [lnwire.OnionPacketSize]byte
copy(fakeOnionBlob[:], bytes.Repeat([]byte{0x05}, lnwire.OnionPacketSize))
// We'll start off the scenario with Bob sending 3 HTLC's to Alice in a
// single state update.
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
const numBobHtlcs = 3
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xbb}, 32))
for i := 0; i < 3; i++ {
rHash := sha256.Sum256(bobPreimage[:])
h := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
ExtraData: make([]byte, 0),
}
htlcIndex, err := bobChannel.AddHTLC(h, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
h.ID = htlcIndex
if _, err := aliceChannel.ReceiveHTLC(h); err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
}
chanID := lnwire.NewChanIDFromOutPoint(
&aliceChannel.channelState.FundingOutpoint,
)
// With the HTLC's applied to both update logs, we'll initiate a state
// transition from Bob.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// Next, Alice's settles all 3 HTLC's from Bob, and also adds a new
// HTLC of her own.
for i := 0; i < 3; i++ {
err := aliceChannel.SettleHTLC(bobPreimage, uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(bobPreimage, uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
}
var alicePreimage [32]byte
copy(alicePreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash := sha256.Sum256(alicePreimage[:])
aliceHtlc := &lnwire.UpdateAddHTLC{
ChanID: chanID,
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
ExtraData: make([]byte, 0),
}
aliceHtlcIndex, err := aliceChannel.AddHTLC(aliceHtlc, nil)
if err != nil {
t.Fatalf("unable to add alice's htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(aliceHtlc)
if err != nil {
t.Fatalf("unable to recv alice's htlc: %v", err)
}
// Now we'll begin the core of the test itself. Alice will extend a new
// commitment to Bob, but the connection drops before Bob can process
// it.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// Bob doesn't get this message so upon reconnection, they need to
// synchronize. Alice should conclude that she owes Bob a commitment,
// while Bob should think he's properly synchronized.
aliceSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
// This is a helper function that asserts Alice concludes that she
// needs to retransmit the exact commitment that we failed to send
// above.
assertAliceCommitRetransmit := func() {
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(
bobSyncMsg,
)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(aliceMsgsToSend) != 5 {
t.Fatalf("expected alice to send %v messages instead "+
"will send %v: %v", 5, len(aliceMsgsToSend),
spew.Sdump(aliceMsgsToSend))
}
// Each of the settle messages that Alice sent should match her
// original intent.
for i := 0; i < 3; i++ {
settleMsg, ok := aliceMsgsToSend[i].(*lnwire.UpdateFulfillHTLC)
if !ok {
t.Fatalf("expected an HTLC settle message, "+
"instead have %v", spew.Sdump(settleMsg))
}
if settleMsg.ID != uint64(i) {
t.Fatalf("wrong ID in settle msg: expected %v, "+
"got %v", i, settleMsg.ID)
}
if settleMsg.ChanID != chanID {
t.Fatalf("incorrect chan id: expected %v, got %v",
chanID, settleMsg.ChanID)
}
if settleMsg.PaymentPreimage != bobPreimage {
t.Fatalf("wrong pre-image: expected %v, got %v",
alicePreimage, settleMsg.PaymentPreimage)
}
}
// The HTLC add message should be identical.
if _, ok := aliceMsgsToSend[3].(*lnwire.UpdateAddHTLC); !ok {
t.Fatalf("expected an HTLC add message, instead have %v",
spew.Sdump(aliceMsgsToSend[3]))
}
if !reflect.DeepEqual(aliceHtlc, aliceMsgsToSend[3]) {
t.Fatalf("htlc msg doesn't match exactly: "+
"expected %v got %v", spew.Sdump(aliceHtlc),
spew.Sdump(aliceMsgsToSend[3]))
}
// Next, we'll ensure that the CommitSig message exactly
// matches what Alice originally intended to send.
commitSigMsg, ok := aliceMsgsToSend[4].(*lnwire.CommitSig)
if !ok {
t.Fatalf("expected a CommitSig message, instead have %v",
spew.Sdump(aliceMsgsToSend[4]))
}
if commitSigMsg.CommitSig != aliceSig {
t.Fatalf("commit sig msgs don't match: expected %x got %x",
aliceSig, commitSigMsg.CommitSig)
}
if len(commitSigMsg.HtlcSigs) != len(aliceHtlcSigs) {
t.Fatalf("wrong number of htlc sigs: expected %v, got %v",
len(aliceHtlcSigs), len(commitSigMsg.HtlcSigs))
}
for i, htlcSig := range commitSigMsg.HtlcSigs {
if htlcSig != aliceHtlcSigs[i] {
t.Fatalf("htlc sig msgs don't match: "+
"expected %x got %x",
aliceHtlcSigs[i],
htlcSig)
}
}
}
// Alice should detect that she needs to re-send 5 messages: the 3
// settles, her HTLC add, and finally her commit sig message.
assertAliceCommitRetransmit()
// From Bob's Pov he has nothing else to send, so he should conclude he
// has no further action remaining.
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(bobMsgsToSend) != 0 {
t.Fatalf("expected bob to send %v messages instead will "+
"send %v: %v", 5, len(bobMsgsToSend),
spew.Sdump(bobMsgsToSend))
}
// If we restart Alice, she should still conclude that she needs to
// send the exact same set of messages.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
assertAliceCommitRetransmit()
// TODO(roasbeef): restart bob as well???
// At this point, we should be able to resume the prior state update
// without any issues, resulting in Alice settling the 3 htlc's, and
// adding one of her own.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
// At this point, we'll now assert that their log states are what we
// expect.
//
// Alice's local log counter should be 4 and her HTLC index 3. She
// should detect Bob's remote log counter as being 3 and his HTLC index
// 3 as well.
if aliceChannel.localUpdateLog.logIndex != 4 {
t.Fatalf("incorrect log index: expected %v, got %v", 4,
aliceChannel.localUpdateLog.logIndex)
}
if aliceChannel.localUpdateLog.htlcCounter != 1 {
t.Fatalf("incorrect htlc index: expected %v, got %v", 1,
aliceChannel.localUpdateLog.htlcCounter)
}
if aliceChannel.remoteUpdateLog.logIndex != 3 {
t.Fatalf("incorrect log index: expected %v, got %v", 3,
aliceChannel.localUpdateLog.logIndex)
}
if aliceChannel.remoteUpdateLog.htlcCounter != 3 {
t.Fatalf("incorrect htlc index: expected %v, got %v", 3,
aliceChannel.localUpdateLog.htlcCounter)
}
// Bob should also have the same state, but mirrored.
if bobChannel.localUpdateLog.logIndex != 3 {
t.Fatalf("incorrect log index: expected %v, got %v", 3,
bobChannel.localUpdateLog.logIndex)
}
if bobChannel.localUpdateLog.htlcCounter != 3 {
t.Fatalf("incorrect htlc index: expected %v, got %v", 3,
bobChannel.localUpdateLog.htlcCounter)
}
if bobChannel.remoteUpdateLog.logIndex != 4 {
t.Fatalf("incorrect log index: expected %v, got %v", 4,
bobChannel.localUpdateLog.logIndex)
}
if bobChannel.remoteUpdateLog.htlcCounter != 1 {
t.Fatalf("incorrect htlc index: expected %v, got %v", 1,
bobChannel.localUpdateLog.htlcCounter)
}
// We'll conclude the test by having Bob settle Alice's HTLC, then
// initiate a state transition.
err = bobChannel.SettleHTLC(alicePreimage, bobHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(alicePreimage, aliceHtlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// At this point, the final balances of both parties should properly
// reflect the amount of HTLC's sent.
bobMsatSent := numBobHtlcs * htlcAmt
if aliceChannel.channelState.TotalMSatSent != htlcAmt {
t.Fatalf("wrong value for msat sent: expected %v, got %v",
htlcAmt, aliceChannel.channelState.TotalMSatSent)
}
if aliceChannel.channelState.TotalMSatReceived != bobMsatSent {
t.Fatalf("wrong value for msat recv: expected %v, got %v",
bobMsatSent, aliceChannel.channelState.TotalMSatReceived)
}
if bobChannel.channelState.TotalMSatSent != bobMsatSent {
t.Fatalf("wrong value for msat sent: expected %v, got %v",
bobMsatSent, bobChannel.channelState.TotalMSatSent)
}
if bobChannel.channelState.TotalMSatReceived != htlcAmt {
t.Fatalf("wrong value for msat recv: expected %v, got %v",
htlcAmt, bobChannel.channelState.TotalMSatReceived)
}
}
// TestChanSyncOweCommitmentPendingRemote asserts that local updates are applied
// to the remote commit across restarts.
func TestChanSyncOweCommitmentPendingRemote(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
var fakeOnionBlob [lnwire.OnionPacketSize]byte
copy(fakeOnionBlob[:], bytes.Repeat([]byte{0x05}, lnwire.OnionPacketSize))
// We'll start off the scenario where Bob send two htlcs to Alice in a
// single state update.
var preimages []lntypes.Preimage
const numHtlcs = 2
for id := byte(0); id < numHtlcs; id++ {
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{id}, 32))
rHash := sha256.Sum256(bobPreimage[:])
h := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
}
htlcIndex, err := bobChannel.AddHTLC(h, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
h.ID = htlcIndex
if _, err := aliceChannel.ReceiveHTLC(h); err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
preimages = append(preimages, bobPreimage)
}
// With the HTLCs applied to both update logs, we'll initiate a state
// transition from Bob.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// Next, Alice settles the HTLCs from Bob in distinct state updates.
for i := 0; i < numHtlcs; i++ {
err = aliceChannel.SettleHTLC(preimages[i], uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(preimages[i], uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
// Bob revokes his current commitment. After this call
// completes, the htlc is settled on the local commitment
// transaction. Bob still owes Alice a signature to also settle
// the htlc on her local commitment transaction.
bobRevoke, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevoke)
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
}
// We restart Bob. This should have no impact on further message that
// are generated.
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart bob: %v", err)
}
// Bob signs the commitment he owes.
bobCommit, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// This commitment is expected to contain no htlcs anymore.
if len(bobHtlcSigs) != 0 {
t.Fatalf("no htlcs expected, but got %v", len(bobHtlcSigs))
}
// Get Alice to revoke and trigger Bob to compact his logs.
err = aliceChannel.ReceiveNewCommitment(bobCommit, bobHtlcSigs)
if err != nil {
t.Fatal(err)
}
aliceRevoke, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevoke)
if err != nil {
t.Fatal(err)
}
}
// TestChanSyncOweRevocation tests that if Bob restarts (and then Alice) before
// he receiver's Alice's RevokeAndAck message, then Alice concludes that she
// needs to re-send the RevokeAndAck. After the revocation has been sent, both
// nodes should be able to successfully complete another state transition.
func TestChanSyncOweRevocation(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
chanID := lnwire.NewChanIDFromOutPoint(
&aliceChannel.channelState.FundingOutpoint,
)
// We'll start the test with Bob extending a single HTLC to Alice, and
// then initiating a state transition.
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash := sha256.Sum256(bobPreimage[:])
bobHtlc := &lnwire.UpdateAddHTLC{
ChanID: chanID,
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
}
bobHtlcIndex, err := bobChannel.AddHTLC(bobHtlc, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
aliceHtlcIndex, err := aliceChannel.ReceiveHTLC(bobHtlc)
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// Next, Alice will settle that single HTLC, the _begin_ the start of a
// state transition.
err = aliceChannel.SettleHTLC(bobPreimage, aliceHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(bobPreimage, bobHtlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
// We'll model the state transition right up until Alice needs to send
// her revocation message to complete the state transition.
//
// Alice signs the next state, then Bob receives and sends his
// revocation message.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
// At this point, we'll simulate the connection breaking down by Bob's
// lack of knowledge of the revocation message that Alice just sent.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
// If we fetch the channel sync messages at this state, then Alice
// should report that she owes Bob a revocation message, while Bob
// thinks they're fully in sync.
aliceSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
assertAliceOwesRevoke := func() {
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(aliceMsgsToSend) != 1 {
t.Fatalf("expected single message retransmission from Alice, "+
"instead got %v", spew.Sdump(aliceMsgsToSend))
}
aliceReRevoke, ok := aliceMsgsToSend[0].(*lnwire.RevokeAndAck)
if !ok {
t.Fatalf("expected to retransmit revocation msg, instead "+
"have: %v", spew.Sdump(aliceMsgsToSend[0]))
}
// Alice should re-send the revocation message for her prior
// state.
expectedRevocation, err := aliceChannel.generateRevocation(
aliceChannel.currentHeight - 1,
)
if err != nil {
t.Fatalf("unable to regenerate revocation: %v", err)
}
if !reflect.DeepEqual(expectedRevocation, aliceReRevoke) {
t.Fatalf("wrong re-revocation: expected %v, got %v",
expectedRevocation, aliceReRevoke)
}
}
// From Bob's PoV he shouldn't think that he owes Alice any messages.
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(bobMsgsToSend) != 0 {
t.Fatalf("expected bob to not retransmit, instead has: %v",
spew.Sdump(bobMsgsToSend))
}
// Alice should detect that she owes Bob a revocation message, and only
// that single message.
assertAliceOwesRevoke()
// If we restart Alice, then she should still decide that she owes a
// revocation message to Bob.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
assertAliceOwesRevoke()
// TODO(roasbeef): restart bob too???
// We'll continue by then allowing bob to process Alice's revocation message.
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
// Finally, Alice will add an HTLC over her own such that we assert the
// channel can continue to receive updates.
var alicePreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash = sha256.Sum256(alicePreimage[:])
aliceHtlc := &lnwire.UpdateAddHTLC{
ChanID: chanID,
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
}
if _, err := aliceChannel.AddHTLC(aliceHtlc, nil); err != nil {
t.Fatalf("unable to add alice's htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(aliceHtlc); err != nil {
t.Fatalf("unable to recv alice's htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state transition: %v", err)
}
// At this point, both sides should detect that they're fully synced.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
}
// TestChanSyncOweRevocationAndCommit tests that if Alice initiates a state
// transition with Bob and Bob sends both a RevokeAndAck and CommitSig message
// but Alice doesn't receive them before the connection dies, then he'll
// retransmit them both.
func TestChanSyncOweRevocationAndCommit(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
// We'll kick off the test by having Bob send Alice an HTLC, then lock
// it in with a state transition.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash := sha256.Sum256(bobPreimage[:])
bobHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
}
bobHtlcIndex, err := bobChannel.AddHTLC(bobHtlc, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
aliceHtlcIndex, err := aliceChannel.ReceiveHTLC(bobHtlc)
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// Next, Alice will settle that incoming HTLC, then we'll start the
// core of the test itself.
err = aliceChannel.SettleHTLC(bobPreimage, aliceHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(bobPreimage, bobHtlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
// Progressing the exchange: Alice will send her signature, Bob will
// receive, send a revocation and also a signature for Alice's state.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
// Bob generates the revoke and sig message, but the messages don't
// reach Alice before the connection dies.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
// If we now attempt to resync, then Alice should conclude that she
// doesn't need any further updates, while Bob concludes that he needs
// to re-send both his revocation and commit sig message.
aliceSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(aliceMsgsToSend) != 0 {
t.Fatalf("expected alice to not retransmit, instead she's "+
"sending: %v", spew.Sdump(aliceMsgsToSend))
}
assertBobSendsRevokeAndCommit := func() {
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(bobMsgsToSend) != 2 {
t.Fatalf("expected bob to send %v messages, instead "+
"sends: %v", 2, spew.Sdump(bobMsgsToSend))
}
bobReRevoke, ok := bobMsgsToSend[0].(*lnwire.RevokeAndAck)
if !ok {
t.Fatalf("expected bob to re-send revoke, instead sending: %v",
spew.Sdump(bobMsgsToSend[0]))
}
if !reflect.DeepEqual(bobReRevoke, bobRevocation) {
t.Fatalf("revocation msgs don't match: expected %v, got %v",
bobRevocation, bobReRevoke)
}
bobReCommitSigMsg, ok := bobMsgsToSend[1].(*lnwire.CommitSig)
if !ok {
t.Fatalf("expected bob to re-send commit sig, instead sending: %v",
spew.Sdump(bobMsgsToSend[1]))
}
if bobReCommitSigMsg.CommitSig != bobSig {
t.Fatalf("commit sig msgs don't match: expected %x got %x",
bobSig, bobReCommitSigMsg.CommitSig)
}
if len(bobReCommitSigMsg.HtlcSigs) != len(bobHtlcSigs) {
t.Fatalf("wrong number of htlc sigs: expected %v, got %v",
len(bobHtlcSigs), len(bobReCommitSigMsg.HtlcSigs))
}
for i, htlcSig := range bobReCommitSigMsg.HtlcSigs {
if htlcSig != aliceHtlcSigs[i] {
t.Fatalf("htlc sig msgs don't match: "+
"expected %x got %x",
bobHtlcSigs[i], htlcSig)
}
}
}
// We expect Bob to send exactly two messages: first his revocation
// message to Alice, and second his original commit sig message.
assertBobSendsRevokeAndCommit()
// At this point we simulate the connection failing with a restart from
// Bob. He should still re-send the exact same set of messages.
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
assertBobSendsRevokeAndCommit()
// We'll now finish the state transition by having Alice process both
// messages, and send her final revocation.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
}
// TestChanSyncOweRevocationAndCommitForceTransition tests that if Alice
// initiates a state transition with Bob, but Alice fails to receive his
// RevokeAndAck and the connection dies before Bob sends his CommitSig message,
// then Bob will re-send her RevokeAndAck message. Bob will also send and
// _identical_ CommitSig as he detects his commitment chain is ahead of
// Alice's.
func TestChanSyncOweRevocationAndCommitForceTransition(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
// We'll kick off the test by having Bob send Alice an HTLC, then lock
// it in with a state transition.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash := sha256.Sum256(bobPreimage[:])
var bobHtlc [2]*lnwire.UpdateAddHTLC
bobHtlc[0] = &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
}
bobHtlcIndex, err := bobChannel.AddHTLC(bobHtlc[0], nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
aliceHtlcIndex, err := aliceChannel.ReceiveHTLC(bobHtlc[0])
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// To ensure the channel sync logic handles the case where the two
// commit chains are at different heights, we'll add another HTLC from
// Bob to Alice, but let Alice skip the commitment for this state
// update.
rHash = sha256.Sum256(bytes.Repeat([]byte{0xbb}, 32))
bobHtlc[1] = &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
ID: 1,
}
_, err = bobChannel.AddHTLC(bobHtlc[1], nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
_, err = aliceChannel.ReceiveHTLC(bobHtlc[1])
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
// Bob signs the new state update, and sends the signature to Alice.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
// Alice revokes her current state, but doesn't immediately send a
// signature for Bob's updated state. Instead she will issue a new
// update before sending a new CommitSig. This will lead to Alice's
// local commit chain getting height > remote commit chain.
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
// Next, Alice will settle that incoming HTLC, then we'll start the
// core of the test itself.
err = aliceChannel.SettleHTLC(bobPreimage, aliceHtlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = bobChannel.ReceiveHTLCSettle(bobPreimage, bobHtlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
// Progressing the exchange: Alice will send her signature, with Bob
// processing the new state locally.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
// Bob then sends his revocation message, but before Alice can process
// it (and before he scan send his CommitSig message), then connection
// dies.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
// Now if we attempt to synchronize states at this point, Alice should
// detect that she owes nothing, while Bob should re-send both his
// RevokeAndAck as well as his commitment message.
aliceSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(aliceMsgsToSend) != 0 {
t.Fatalf("expected alice to not retransmit, instead she's "+
"sending: %v", spew.Sdump(aliceMsgsToSend))
}
// If we process Alice's sync message from Bob's PoV, then he should
// send his RevokeAndAck message again. Additionally, the CommitSig
// message that he sends should be sufficient to finalize the state
// transition.
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(bobMsgsToSend) != 2 {
t.Fatalf("expected bob to send %v messages, instead "+
"sends: %v", 2, spew.Sdump(bobMsgsToSend))
}
bobReRevoke, ok := bobMsgsToSend[0].(*lnwire.RevokeAndAck)
if !ok {
t.Fatalf("expected bob to re-send revoke, instead sending: %v",
spew.Sdump(bobMsgsToSend[0]))
}
if !reflect.DeepEqual(bobReRevoke, bobRevocation) {
t.Fatalf("revocation msgs don't match: expected %v, got %v",
bobRevocation, bobReRevoke)
}
// The second message should be his CommitSig message that he never
// sent, but will send in order to force both states to synchronize.
bobReCommitSigMsg, ok := bobMsgsToSend[1].(*lnwire.CommitSig)
if !ok {
t.Fatalf("expected bob to re-send commit sig, instead sending: %v",
spew.Sdump(bobMsgsToSend[1]))
}
// At this point we simulate the connection failing with a restart from
// Bob. He should still re-send the exact same set of messages.
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
if len(bobMsgsToSend) != 2 {
t.Fatalf("expected bob to send %v messages, instead "+
"sends: %v", 2, spew.Sdump(bobMsgsToSend))
}
bobReRevoke, ok = bobMsgsToSend[0].(*lnwire.RevokeAndAck)
if !ok {
t.Fatalf("expected bob to re-send revoke, instead sending: %v",
spew.Sdump(bobMsgsToSend[0]))
}
bobSigMsg, ok := bobMsgsToSend[1].(*lnwire.CommitSig)
if !ok {
t.Fatalf("expected bob to re-send commit sig, instead sending: %v",
spew.Sdump(bobMsgsToSend[1]))
}
if !reflect.DeepEqual(bobReRevoke, bobRevocation) {
t.Fatalf("revocation msgs don't match: expected %v, got %v",
bobRevocation, bobReRevoke)
}
if bobReCommitSigMsg.CommitSig != bobSigMsg.CommitSig {
t.Fatalf("commit sig msgs don't match: expected %x got %x",
bobSigMsg.CommitSig,
bobReCommitSigMsg.CommitSig)
}
if len(bobReCommitSigMsg.HtlcSigs) != len(bobSigMsg.HtlcSigs) {
t.Fatalf("wrong number of htlc sigs: expected %v, got %v",
len(bobSigMsg.HtlcSigs), len(bobReCommitSigMsg.HtlcSigs))
}
for i, htlcSig := range bobReCommitSigMsg.HtlcSigs {
if htlcSig != bobSigMsg.HtlcSigs[i] {
t.Fatalf("htlc sig msgs don't match: "+
"expected %x got %x",
bobSigMsg.HtlcSigs[i], htlcSig)
}
}
// Now, we'll continue the exchange, sending Bob's revocation and
// signature message to Alice, ending with Alice sending her revocation
// message to Bob.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(
bobSigMsg.CommitSig, bobSigMsg.HtlcSigs,
)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
aliceRevocation, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
}
// TestChanSyncFailure tests the various scenarios during channel sync where we
// should be able to detect that the channels cannot be synced because of
// invalid state.
func TestChanSyncFailure(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
htlcAmt := lnwire.NewMSatFromSatoshis(20000)
index := byte(0)
// advanceState is a helper method to fully advance the channel state
// by one.
advanceState := func() {
t.Helper()
// We'll kick off the test by having Bob send Alice an HTLC,
// then lock it in with a state transition.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa - index}, 32))
rHash := sha256.Sum256(bobPreimage[:])
bobHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
ID: uint64(index),
}
index++
_, err := bobChannel.AddHTLC(bobHtlc, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
_, err = aliceChannel.ReceiveHTLC(bobHtlc)
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
err = ForceStateTransition(bobChannel, aliceChannel)
if err != nil {
t.Fatalf("unable to complete bob's state "+
"transition: %v", err)
}
}
// halfAdvance is a helper method that sends a new commitment signature
// from Alice to Bob, but doesn't make Bob revoke his current state.
halfAdvance := func() {
t.Helper()
// We'll kick off the test by having Bob send Alice an HTLC,
// then lock it in with a state transition.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa - index}, 32))
rHash := sha256.Sum256(bobPreimage[:])
bobHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: htlcAmt,
Expiry: uint32(10),
ID: uint64(index),
}
index++
_, err := bobChannel.AddHTLC(bobHtlc, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
_, err = aliceChannel.ReceiveHTLC(bobHtlc)
if err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign next commit: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commit sig: %v", err)
}
}
// assertLocalDataLoss checks that aliceOld and bobChannel detects that
// Alice has lost state during sync.
assertLocalDataLoss := func(aliceOld *LightningChannel) {
t.Helper()
aliceSyncMsg, err := aliceOld.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
// Alice should detect from Bob's message that she lost state.
_, _, _, err = aliceOld.ProcessChanSyncMsg(bobSyncMsg)
if _, ok := err.(*ErrCommitSyncLocalDataLoss); !ok {
t.Fatalf("wrong error, expected "+
"ErrCommitSyncLocalDataLoss instead got: %v",
err)
}
// Bob should detect that Alice probably lost state.
_, _, _, err = bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != ErrCommitSyncRemoteDataLoss {
t.Fatalf("wrong error, expected "+
"ErrCommitSyncRemoteDataLoss instead got: %v",
err)
}
}
// clearBorkedState is a method that allows us to clear the borked
// state that will arise after the first chan message sync. We need to
// do this in order to be able to continue to update the commitment
// state for our test scenarios.
clearBorkedState := func() {
err = aliceChannel.channelState.ClearChanStatus(
channeldb.ChanStatusLocalDataLoss | channeldb.ChanStatusBorked,
)
if err != nil {
t.Fatalf("unable to update channel state: %v", err)
}
err = bobChannel.channelState.ClearChanStatus(
channeldb.ChanStatusLocalDataLoss | channeldb.ChanStatusBorked,
)
if err != nil {
t.Fatalf("unable to update channel state: %v", err)
}
}
// Start by advancing the state.
advanceState()
// They should be in sync.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// Make a copy of Alice's state from the database at this point.
aliceOld, err := restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
// Advance the states.
advanceState()
// Trying to sync up the old version of Alice's channel should detect
// that we are out of sync.
assertLocalDataLoss(aliceOld)
// Make sure the up-to-date channels still are in sync.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// Clear the borked state before we attempt to advance.
clearBorkedState()
// Advance the state again, and do the same check.
advanceState()
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
assertLocalDataLoss(aliceOld)
// If we remove the recovery options from Bob's message, Alice cannot
// tell if she lost state, since Bob might be lying. She still should
// be able to detect that chains cannot be synced.
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg.LocalUnrevokedCommitPoint = nil
_, _, _, err = aliceOld.ProcessChanSyncMsg(bobSyncMsg)
if err != ErrCannotSyncCommitChains {
t.Fatalf("wrong error, expected ErrCannotSyncCommitChains "+
"instead got: %v", err)
}
// If Bob lies about the NextLocalCommitHeight, making it greater than
// what Alice expect, she cannot tell for sure whether she lost state,
// but should detect the desync.
bobSyncMsg, err = bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg.NextLocalCommitHeight++
_, _, _, err = aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != ErrCannotSyncCommitChains {
t.Fatalf("wrong error, expected ErrCannotSyncCommitChains "+
"instead got: %v", err)
}
// If Bob's NextLocalCommitHeight is lower than what Alice expects, Bob
// probably lost state.
bobSyncMsg, err = bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg.NextLocalCommitHeight--
_, _, _, err = aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != ErrCommitSyncRemoteDataLoss {
t.Fatalf("wrong error, expected ErrCommitSyncRemoteDataLoss "+
"instead got: %v", err)
}
// If Alice and Bob's states are in sync, but Bob is sending the wrong
// LocalUnrevokedCommitPoint, Alice should detect this.
bobSyncMsg, err = bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
p := bobSyncMsg.LocalUnrevokedCommitPoint.SerializeCompressed()
p[4] ^= 0x01
modCommitPoint, err := btcec.ParsePubKey(p, btcec.S256())
if err != nil {
t.Fatalf("unable to parse pubkey: %v", err)
}
bobSyncMsg.LocalUnrevokedCommitPoint = modCommitPoint
_, _, _, err = aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != ErrInvalidLocalUnrevokedCommitPoint {
t.Fatalf("wrong error, expected "+
"ErrInvalidLocalUnrevokedCommitPoint instead got: %v",
err)
}
// Make sure the up-to-date channels still are good.
assertNoChanSyncNeeded(t, aliceChannel, bobChannel)
// Clear the borked state before we attempt to advance.
clearBorkedState()
// Finally check that Alice is also able to detect a wrong commit point
// when there's a pending remote commit.
halfAdvance()
bobSyncMsg, err = bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg.LocalUnrevokedCommitPoint = modCommitPoint
_, _, _, err = aliceChannel.ProcessChanSyncMsg(bobSyncMsg)
if err != ErrInvalidLocalUnrevokedCommitPoint {
t.Fatalf("wrong error, expected "+
"ErrInvalidLocalUnrevokedCommitPoint instead got: %v",
err)
}
}
// TestFeeUpdateRejectInsaneFee tests that if the initiator tries to attach a
// fee that would put them below their current reserve, then it's rejected by
// the state machine.
func TestFeeUpdateRejectInsaneFee(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Next, we'll try to add a fee rate to Alice which is 1,000,000x her
// starting fee rate.
startingFeeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
newFeeRate := startingFeeRate * 1000000
// Both Alice and Bob should reject this new fee rate as it is far too
// large.
if err := aliceChannel.UpdateFee(newFeeRate); err == nil {
t.Fatalf("alice should have rejected fee update")
}
}
// TestChannelRetransmissionFeeUpdate tests that the initiator will include any
// pending fee updates if it needs to retransmit signatures.
func TestChannelRetransmissionFeeUpdate(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll fetch the current fee rate present within the
// commitment transactions.
startingFeeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
// Next, we'll start a commitment update, with Alice sending a new
// update to double the fee rate of the commitment.
newFeeRate := startingFeeRate * 2
if err := aliceChannel.UpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Alice's channel: %v", err)
}
if err := bobChannel.ReceiveUpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Bob's channel: %v", err)
}
// Now, Alice will send a new commitment to Bob, but we'll simulate a
// connection failure, so Bob doesn't get her signature.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// Restart both channels to simulate a connection restart.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
// Bob doesn't get this message so upon reconnection, they need to
// synchronize. Alice should conclude that she owes Bob a commitment,
// while Bob should think he's properly synchronized.
aliceSyncMsg, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
bobSyncMsg, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to produce chan sync msg: %v", err)
}
// Bob should detect that he doesn't need to send anything to Alice.
bobMsgsToSend, _, _, err := bobChannel.ProcessChanSyncMsg(aliceSyncMsg)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(bobMsgsToSend) != 0 {
t.Fatalf("expected bob to send %v messages instead "+
"will send %v: %v", 0, len(bobMsgsToSend),
spew.Sdump(bobMsgsToSend))
}
// When Alice processes Bob's chan sync message, she should realize
// that she needs to first send a new UpdateFee message, and also a
// CommitSig.
aliceMsgsToSend, _, _, err := aliceChannel.ProcessChanSyncMsg(
bobSyncMsg,
)
if err != nil {
t.Fatalf("unable to process chan sync msg: %v", err)
}
if len(aliceMsgsToSend) != 2 {
t.Fatalf("expected alice to send %v messages instead "+
"will send %v: %v", 2, len(aliceMsgsToSend),
spew.Sdump(aliceMsgsToSend))
}
// The first message should be an UpdateFee message.
retransFeeMsg, ok := aliceMsgsToSend[0].(*lnwire.UpdateFee)
if !ok {
t.Fatalf("expected UpdateFee message, instead have: %v",
spew.Sdump(aliceMsgsToSend[0]))
}
// The fee should match exactly the new fee update we applied above.
if retransFeeMsg.FeePerKw != uint32(newFeeRate) {
t.Fatalf("fee update doesn't match: expected %v, got %v",
uint32(newFeeRate), retransFeeMsg)
}
// The second, should be a CommitSig message, and be identical to the
// sig message she sent prior.
commitSigMsg, ok := aliceMsgsToSend[1].(*lnwire.CommitSig)
if !ok {
t.Fatalf("expected a CommitSig message, instead have %v",
spew.Sdump(aliceMsgsToSend[1]))
}
if commitSigMsg.CommitSig != aliceSig {
t.Fatalf("commit sig msgs don't match: expected %x got %x",
aliceSig, commitSigMsg.CommitSig)
}
if len(commitSigMsg.HtlcSigs) != len(aliceHtlcSigs) {
t.Fatalf("wrong number of htlc sigs: expected %v, got %v",
len(aliceHtlcSigs), len(commitSigMsg.HtlcSigs))
}
for i, htlcSig := range commitSigMsg.HtlcSigs {
if htlcSig != aliceHtlcSigs[i] {
t.Fatalf("htlc sig msgs don't match: "+
"expected %x got %x",
aliceHtlcSigs[i], htlcSig)
}
}
// Now, we if re-apply the updates to Bob, we should be able to resume
// the commitment update as normal.
if err := bobChannel.ReceiveUpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Bob's channel: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
// Both parties should now have the latest fee rate locked-in.
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("alice's feePerKw was not locked in")
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("bob's feePerKw was not locked in")
}
// Finally, we'll add with adding a new HTLC, then forcing a state
// transition. This should also proceed as normal.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xaa}, 32))
rHash := sha256.Sum256(bobPreimage[:])
bobHtlc := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: lnwire.NewMSatFromSatoshis(20000),
Expiry: uint32(10),
}
if _, err := bobChannel.AddHTLC(bobHtlc, nil); err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
if _, err := aliceChannel.ReceiveHTLC(bobHtlc); err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
}
// TestFeeUpdateOldDiskFormat tests that we properly recover FeeUpdates written
// to disk using the old format, where the logIndex was not written.
func TestFeeUpdateOldDiskFormat(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// helper that counts the number of updates, and number of fee updates
// in the given log.
countLog := func(log *updateLog) (int, int) {
var numUpdates, numFee int
for e := log.Front(); e != nil; e = e.Next() {
htlc := e.Value.(*PaymentDescriptor)
if htlc.EntryType == FeeUpdate {
numFee++
}
numUpdates++
}
return numUpdates, numFee
}
// helper that asserts that Alice's local log and Bob's remote log
// contains the expected number of fee updates and adds.
assertLogItems := func(expFee, expAdd int) {
t.Helper()
expUpd := expFee + expAdd
upd, fees := countLog(aliceChannel.localUpdateLog)
if upd != expUpd {
t.Fatalf("expected %d updates, found %d in Alice's "+
"log", expUpd, upd)
}
if fees != expFee {
t.Fatalf("expected %d fee updates, found %d in "+
"Alice's log", expFee, fees)
}
upd, fees = countLog(bobChannel.remoteUpdateLog)
if upd != expUpd {
t.Fatalf("expected %d updates, found %d in Bob's log",
expUpd, upd)
}
if fees != expFee {
t.Fatalf("expected %d fee updates, found %d in Bob's "+
"log", expFee, fees)
}
}
// First, we'll fetch the current fee rate present within the
// commitment transactions.
startingFeeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
newFeeRate := startingFeeRate
// We will send a few HTLCs and a fee update.
htlcAmt := lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
const numHTLCs = 30
var htlcs []*lnwire.UpdateAddHTLC
for i := 0; i < numHTLCs; i++ {
htlc, _ := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
htlcs = append(htlcs, htlc)
if i%5 != 0 {
continue
}
// After every 5th HTLC, we'll also include a fee update.
newFeeRate += startingFeeRate
if err := aliceChannel.UpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Alice's channel: %v",
err)
}
if err := bobChannel.ReceiveUpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Bob's channel: %v",
err)
}
}
// Check that the expected number of items is found in the logs.
expFee := numHTLCs / 5
assertLogItems(expFee, numHTLCs)
// Now, Alice will send a new commitment to Bob, but we'll simulate a
// connection failure, so Bob doesn't get the signature.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// Before restarting Alice, to mimic the old format, we fetch the
// pending remote commit from disk, set the UpdateFee message's
// logIndex to 0, and re-write it.
pendingRemoteCommitDiff, err := aliceChannel.channelState.RemoteCommitChainTip()
if err != nil {
t.Fatal(err)
}
for i, u := range pendingRemoteCommitDiff.LogUpdates {
switch u.UpdateMsg.(type) {
case *lnwire.UpdateFee:
pendingRemoteCommitDiff.LogUpdates[i].LogIndex = 0
}
}
err = aliceChannel.channelState.AppendRemoteCommitChain(
pendingRemoteCommitDiff,
)
if err != nil {
t.Fatal(err)
}
// Restart both channels to simulate a connection restart. This will
// trigger a update logs restoration.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
// After a reconnection, Alice will resend the pending updates, that
// was not ACKed by Bob, so we re-send the HTLCs and fee updates.
newFeeRate = startingFeeRate
for i := 0; i < numHTLCs; i++ {
htlc := htlcs[i]
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if i%5 != 0 {
continue
}
newFeeRate += startingFeeRate
if err := bobChannel.ReceiveUpdateFee(newFeeRate); err != nil {
t.Fatalf("unable to update fee for Bob's channel: %v",
err)
}
}
assertLogItems(expFee, numHTLCs)
// We send Alice's commitment signatures, and finish the state
// transition.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("bob unable to sign commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("alice unable to recv revocation: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("alice unable to rev bob's commitment: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("alice unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to recv revocation: %v", err)
}
// Both parties should now have the latest fee rate locked-in.
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("alice's feePerKw was not locked in")
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("bob's feePerKw was not locked in")
}
// Finally, to trigger a compactLogs execution, we'll add a new HTLC,
// then force a state transition.
htlc, _ := createHTLC(numHTLCs, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// Finally, check the logs to make sure all fee updates have been
// removed...
assertLogItems(0, numHTLCs+1)
// ...and the final fee rate locked in.
if chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("alice's feePerKw was not locked in")
}
if chainfee.SatPerKWeight(
bobChannel.channelState.LocalCommitment.FeePerKw,
) != newFeeRate {
t.Fatalf("bob's feePerKw was not locked in")
}
}
// TestChanSyncUnableToSync tests that if Alice or Bob receive an invalid
// ChannelReestablish messages,then they reject the message and declare the
// channel un-continuable by returning ErrCannotSyncCommitChains.
func TestChanSyncUnableToSync(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// If we immediately send both sides a "bogus" ChanSync message, then
// they both should conclude that they're unable to synchronize the
// state.
badChanSync := &lnwire.ChannelReestablish{
ChanID: lnwire.NewChanIDFromOutPoint(
&aliceChannel.channelState.FundingOutpoint,
),
NextLocalCommitHeight: 1000,
RemoteCommitTailHeight: 9000,
}
_, _, _, err = bobChannel.ProcessChanSyncMsg(badChanSync)
if err != ErrCannotSyncCommitChains {
t.Fatalf("expected error instead have: %v", err)
}
_, _, _, err = aliceChannel.ProcessChanSyncMsg(badChanSync)
if err != ErrCannotSyncCommitChains {
t.Fatalf("expected error instead have: %v", err)
}
}
// TestChanSyncInvalidLastSecret ensures that if Alice and Bob have completed
// state transitions in an existing channel, and then send a ChannelReestablish
// message after a restart, the following holds: if Alice has lost data, so she
// sends an invalid commit secret then both parties recognize this as possible
// data loss.
func TestChanSyncInvalidLastSecret(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We'll create a new instances of Alice before doing any state updates
// such that we have the initial in memory state at the start of the
// channel.
aliceOld, err := restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice")
}
// First, we'll add an HTLC, and then initiate a state transition
// between the two parties such that we actually have a prior
// revocation to send.
var paymentPreimage [32]byte
copy(paymentPreimage[:], bytes.Repeat([]byte{1}, 32))
paymentHash := sha256.Sum256(paymentPreimage[:])
htlcAmt := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin)
htlc := &lnwire.UpdateAddHTLC{
PaymentHash: paymentHash,
Amount: htlcAmt,
Expiry: uint32(5),
}
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Then we'll initiate a state transition to lock in this new HTLC.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state transition: %v", err)
}
// Next, we'll restart both parties in order to simulate a connection
// re-establishment.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart bob: %v", err)
}
// Next, we'll produce the ChanSync messages for both parties.
aliceChanSync, err := aliceChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to generate chan sync msg: %v", err)
}
bobChanSync, err := bobChannel.channelState.ChanSyncMsg()
if err != nil {
t.Fatalf("unable to generate chan sync msg: %v", err)
}
// We'll modify Alice's sync message to have an invalid commitment
// secret.
aliceChanSync.LastRemoteCommitSecret[4] ^= 0x01
// Alice's former self should conclude that she possibly lost data as
// Bob is sending a valid commit secret for the latest state.
_, _, _, err = aliceOld.ProcessChanSyncMsg(bobChanSync)
if _, ok := err.(*ErrCommitSyncLocalDataLoss); !ok {
t.Fatalf("wrong error, expected ErrCommitSyncLocalDataLoss "+
"instead got: %v", err)
}
// Bob should conclude that he should force close the channel, as Alice
// cannot continue operation.
_, _, _, err = bobChannel.ProcessChanSyncMsg(aliceChanSync)
if err != ErrInvalidLastCommitSecret {
t.Fatalf("wrong error, expected ErrInvalidLastCommitSecret, "+
"instead got: %v", err)
}
}
// TestChanAvailableBandwidth tests the accuracy of the AvailableBalance()
// method. The value returned from this message should reflect the value
// returned within the commitment state of a channel after the transition is
// initiated.
func TestChanAvailableBandwidth(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
aliceReserve := lnwire.NewMSatFromSatoshis(
aliceChannel.channelState.LocalChanCfg.ChanReserve,
)
feeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
htlcFee := lnwire.NewMSatFromSatoshis(
feeRate.FeeForWeight(input.HTLCWeight),
)
assertBandwidthEstimateCorrect := func(aliceInitiate bool) {
// With the HTLC's added, we'll now query the AvailableBalance
// method for the current available channel bandwidth from
// Alice's PoV.
aliceAvailableBalance := aliceChannel.AvailableBalance()
// With this balance obtained, we'll now trigger a state update
// to actually determine what the current up to date balance
// is.
if aliceInitiate {
err := ForceStateTransition(aliceChannel, bobChannel)
if err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
} else {
err := ForceStateTransition(bobChannel, aliceChannel)
if err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
}
// Now, we'll obtain the current available bandwidth in Alice's
// latest commitment and compare that to the prior estimate.
aliceBalance := aliceChannel.channelState.LocalCommitment.LocalBalance
// The balance we have available for new HTLCs should be the
// current local commitment balance, minus the channel reserve
// and the fee for adding an HTLC.
expBalance := aliceBalance - aliceReserve - htlcFee
if expBalance != aliceAvailableBalance {
_, _, line, _ := runtime.Caller(1)
t.Fatalf("line: %v, incorrect balance: expected %v, "+
"got %v", line, expBalance, aliceAvailableBalance)
}
}
// First, we'll add 3 outgoing HTLC's from Alice to Bob.
const numHtlcs = 3
var htlcAmt lnwire.MilliSatoshi = 100000
alicePreimages := make([][32]byte, numHtlcs)
for i := 0; i < numHtlcs; i++ {
htlc, preImage := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
alicePreimages[i] = preImage
}
assertBandwidthEstimateCorrect(true)
// We'll repeat the same exercise, but with non-dust HTLCs. So we'll
// crank up the value of the HTLC's we're adding to the commitment
// transaction.
htlcAmt = lnwire.NewMSatFromSatoshis(30000)
for i := 0; i < numHtlcs; i++ {
htlc, preImage := createHTLC(numHtlcs+i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
alicePreimages = append(alicePreimages, preImage)
}
assertBandwidthEstimateCorrect(true)
// Next, we'll have Bob 5 of Alice's HTLC's, and cancel one of them (in
// the update log).
for i := 0; i < (numHtlcs*2)-1; i++ {
preImage := alicePreimages[i]
err := bobChannel.SettleHTLC(preImage, uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preImage, uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
}
htlcIndex := uint64((numHtlcs * 2) - 1)
err = bobChannel.FailHTLC(htlcIndex, []byte("f"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(htlcIndex, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// We must do a state transition before the balance is available
// for Alice.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
// With the HTLC's settled in the log, we'll now assert that if we
// initiate a state transition, then our guess was correct.
assertBandwidthEstimateCorrect(false)
// TODO(roasbeef): additional tests from diff starting conditions
}
// TestChanAvailableBalanceNearHtlcFee checks that we get the expected reported
// balance when it is close to the htlc fee.
func TestChanAvailableBalanceNearHtlcFee(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Alice and Bob start with half the channel capacity.
aliceBalance := lnwire.NewMSatFromSatoshis(5 * btcutil.SatoshiPerBitcoin)
bobBalance := lnwire.NewMSatFromSatoshis(5 * btcutil.SatoshiPerBitcoin)
aliceReserve := lnwire.NewMSatFromSatoshis(
aliceChannel.channelState.LocalChanCfg.ChanReserve,
)
bobReserve := lnwire.NewMSatFromSatoshis(
bobChannel.channelState.LocalChanCfg.ChanReserve,
)
aliceDustlimit := lnwire.NewMSatFromSatoshis(
aliceChannel.channelState.LocalChanCfg.DustLimit,
)
feeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
htlcFee := lnwire.NewMSatFromSatoshis(
feeRate.FeeForWeight(input.HTLCWeight),
)
commitFee := lnwire.NewMSatFromSatoshis(
aliceChannel.channelState.LocalCommitment.CommitFee,
)
htlcTimeoutFee := lnwire.NewMSatFromSatoshis(
HtlcTimeoutFee(aliceChannel.channelState.ChanType, feeRate),
)
htlcSuccessFee := lnwire.NewMSatFromSatoshis(
HtlcSuccessFee(aliceChannel.channelState.ChanType, feeRate),
)
// Helper method to check the current reported balance.
checkBalance := func(t *testing.T, expBalanceAlice,
expBalanceBob lnwire.MilliSatoshi) {
t.Helper()
aliceBalance := aliceChannel.AvailableBalance()
if aliceBalance != expBalanceAlice {
t.Fatalf("Expected alice balance %v, got %v",
expBalanceAlice, aliceBalance)
}
bobBalance := bobChannel.AvailableBalance()
if bobBalance != expBalanceBob {
t.Fatalf("Expected bob balance %v, got %v",
expBalanceBob, bobBalance)
}
}
// Helper method to send an HTLC from Alice to Bob, decreasing Alice's
// balance.
htlcIndex := uint64(0)
sendHtlc := func(htlcAmt lnwire.MilliSatoshi) {
t.Helper()
htlc, preImage := createHTLC(int(htlcIndex), htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
err = bobChannel.SettleHTLC(preImage, htlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preImage, htlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
htlcIndex++
aliceBalance -= htlcAmt
bobBalance += htlcAmt
}
// Balance should start out equal to half the channel capacity minus
// the commitment fee Alice must pay and the channel reserve. In
// addition the HTLC fee will be subtracted fromt the balance to
// reflect that this value must be reserved for any payment above the
// dust limit.
expAliceBalance := aliceBalance - commitFee - aliceReserve - htlcFee
// Bob is not the initiator, so he will have all his balance available,
// since Alice pays for fees. Bob only need to keep his balance above
// the reserve.
expBobBalance := bobBalance - bobReserve
checkBalance(t, expAliceBalance, expBobBalance)
// Find the minumim size of a non-dust HTLC.
aliceNonDustHtlc := aliceDustlimit + htlcTimeoutFee
// Send a HTLC leaving Alice's remaining balance just enough to have
// nonDustHtlc left after paying the commit fee and htlc fee.
htlcAmt := aliceBalance - (commitFee + aliceReserve + htlcFee + aliceNonDustHtlc)
sendHtlc(htlcAmt)
// Now the real balance left will be
// nonDustHtlc+commitfee+aliceReserve+htlcfee. The available balance
// reported will just be nonDustHtlc, since the rest of the balance is
// reserved.
expAliceBalance = aliceNonDustHtlc
expBobBalance = bobBalance - bobReserve
checkBalance(t, expAliceBalance, expBobBalance)
// Send an HTLC using all but one msat of the reported balance.
htlcAmt = aliceNonDustHtlc - 1
sendHtlc(htlcAmt)
// 1 msat should be left.
expAliceBalance = 1
// Bob should still have all his balance available, since even though
// Alice cannot afford to add a non-dust HTLC, she can afford to add a
// non-dust HTLC from Bob.
expBobBalance = bobBalance - bobReserve
checkBalance(t, expAliceBalance, expBobBalance)
// Sendng the last msat.
htlcAmt = 1
sendHtlc(htlcAmt)
// No balance left.
expAliceBalance = 0
// We try to always reserve enough for the non-iniitator to be able to
// add an HTLC, hence Bob should still have all his non-reserved
// balance available.
expBobBalance = bobBalance - bobReserve
checkBalance(t, expAliceBalance, expBobBalance)
// Even though Alice has a reported balance of 0, this is because we
// try to avoid getting into the position where she cannot pay the fee
// for Bob adding another HTLC. This means she actually _has_ some
// balance left, and we now force the channel into this situation by
// sending yet another HTLC. In practice this can also happen if a fee
// update eats into Alice's balance.
htlcAmt = 1
sendHtlc(htlcAmt)
// Now Alice balance is so low that she cannot even afford to add a new
// HTLC from Bob to the commitment transaction. Bob's balance should
// reflect this, by only reporting dust amount being available. Alice
// should still report a zero balance.
// Since the dustlimit is different for the two commitments, the
// largest HTLC Bob can send that Alice can afford on both commitments
// (remember she cannot afford to pay the HTLC fee) is the largest dust
// HTLC on Alice's commitemnt, since her dust limit is lower.
bobNonDustHtlc := aliceDustlimit + htlcSuccessFee
expBobBalance = bobNonDustHtlc - 1
expAliceBalance = 0
checkBalance(t, expAliceBalance, expBobBalance)
}
// TestChanCommitWeightDustHtlcs checks that we correctly calculate the
// commitment weight when some HTLCs are dust.
func TestChanCommitWeightDustHtlcs(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
aliceDustlimit := lnwire.NewMSatFromSatoshis(
aliceChannel.channelState.LocalChanCfg.DustLimit,
)
bobDustlimit := lnwire.NewMSatFromSatoshis(
bobChannel.channelState.LocalChanCfg.DustLimit,
)
feeRate := chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
)
htlcTimeoutFee := lnwire.NewMSatFromSatoshis(
HtlcTimeoutFee(aliceChannel.channelState.ChanType, feeRate),
)
htlcSuccessFee := lnwire.NewMSatFromSatoshis(
HtlcSuccessFee(aliceChannel.channelState.ChanType, feeRate),
)
// Helper method to add an HTLC from Alice to Bob.
htlcIndex := uint64(0)
addHtlc := func(htlcAmt lnwire.MilliSatoshi) lntypes.Preimage {
t.Helper()
htlc, preImage := createHTLC(int(htlcIndex), htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
return preImage
}
settleHtlc := func(preImage lntypes.Preimage) {
t.Helper()
err = bobChannel.SettleHTLC(preImage, htlcIndex, nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(preImage, htlcIndex)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state "+
"transition: %v", err)
}
htlcIndex++
}
// Helper method that fetches the current remote commitment weight
// fromt the given channel's POV.
remoteCommitWeight := func(lc *LightningChannel) int64 {
remoteACKedIndex := lc.localCommitChain.tip().theirMessageIndex
htlcView := lc.fetchHTLCView(remoteACKedIndex,
lc.localUpdateLog.logIndex)
_, w := lc.availableCommitmentBalance(
htlcView, true,
)
return w
}
// Start by getting the initial remote commitment wight seen from
// Alice's perspective. At this point there are no HTLCs on the
// commitment.
weight1 := remoteCommitWeight(aliceChannel)
// Now add an HTLC that will be just below Bob's dustlimit.
// Since this is an HTLC added from Alice on Bob's commitment, we will
// use the HTLC success fee.
bobDustHtlc := bobDustlimit + htlcSuccessFee - 1
preimg := addHtlc(bobDustHtlc)
// Now get the current wight of the remote commitment. We expect it to
// not have changed, since the HTLC we added is considered dust.
weight2 := remoteCommitWeight(aliceChannel)
require.Equal(t, weight1, weight2)
// In addition, we expect this weight to result in the fee we currently
// see being paid on the remote commitent.
calcFee := feeRate.FeeForWeight(weight2)
remoteCommitFee := aliceChannel.channelState.RemoteCommitment.CommitFee
require.Equal(t, calcFee, remoteCommitFee)
// Settle the HTLC, bringing commitment weight back to base.
settleHtlc(preimg)
// Now we do a similar check from Bob's POV. Start with getting his
// current view of Alice's commitment weight.
weight1 = remoteCommitWeight(bobChannel)
// We'll add an HTLC from Alice to Bob, that is just above dust on
// Alice's commitment. Now we'll use the timeout fee.
aliceDustHtlc := aliceDustlimit + htlcTimeoutFee
preimg = addHtlc(aliceDustHtlc)
// Get the current remote commitment weight from Bob's POV, and ensure
// it is now heavier, since Alice added a non-dust HTLC.
weight2 = remoteCommitWeight(bobChannel)
require.Greater(t, weight2, weight1)
// Ensure the current remote commit has the expected commitfee.
calcFee = feeRate.FeeForWeight(weight2)
remoteCommitFee = bobChannel.channelState.RemoteCommitment.CommitFee
require.Equal(t, calcFee, remoteCommitFee)
settleHtlc(preimg)
}
// TestSignCommitmentFailNotLockedIn tests that a channel will not attempt to
// create a new state if it doesn't yet know of the next revocation point for
// the remote party.
func TestSignCommitmentFailNotLockedIn(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Next, we'll modify Alice's internal state to omit knowledge of Bob's
// next revocation point.
aliceChannel.channelState.RemoteNextRevocation = nil
// If we now try to initiate a state update, then it should fail as
// Alice is unable to actually create a new state.
_, _, _, err = aliceChannel.SignNextCommitment()
if err != ErrNoWindow {
t.Fatalf("expected ErrNoWindow, instead have: %v", err)
}
}
// TestLockedInHtlcForwardingSkipAfterRestart ensures that after a restart, a
// state machine doesn't attempt to re-forward any HTLC's that were already
// locked in, but in a prior state.
func TestLockedInHtlcForwardingSkipAfterRestart(t *testing.T) {
t.Parallel()
// First, we'll make a channel between Alice and Bob.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We'll now add two HTLC's from Alice to Bob, then Alice will initiate
// a state transition.
var htlcAmt lnwire.MilliSatoshi = 100000
htlc, _ := createHTLC(0, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
htlc2, _ := createHTLC(1, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc2, nil); err != nil {
t.Fatalf("unable to add htlc2: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc2); err != nil {
t.Fatalf("unable to recv htlc2: %v", err)
}
// We'll now manually initiate a state transition between Alice and
// bob.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatal(err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// Alice should detect that she doesn't need to forward any HTLC's.
fwdPkg, _, _, _, err := aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatal(err)
}
if len(fwdPkg.Adds) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.SettleFails))
}
// Now, have Bob initiate a transition to lock in the Adds sent by
// Alice.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatal(err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// Bob should now detect that he now has 2 incoming HTLC's that he can
// forward along.
fwdPkg, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatal(err)
}
if len(fwdPkg.Adds) != 2 {
t.Fatalf("bob should forward 2 hltcs, instead has %v",
len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("bob should forward 0 hltcs, instead has %v",
len(fwdPkg.SettleFails))
}
// We'll now restart both Alice and Bob. This emulates a reconnection
// between the two peers.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart bob: %v", err)
}
// With both nodes restarted, Bob will now attempt to cancel one of
// Alice's HTLC's.
err = bobChannel.FailHTLC(htlc.ID, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(htlc.ID, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// We'll now initiate another state transition, but this time Bob will
// lead.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatal(err)
}
aliceRevocation, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// At this point, Bob receives the revocation from Alice, which is now
// his signal to examine all the HTLC's that have been locked in to
// process.
fwdPkg, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatal(err)
}
// Bob should detect that he doesn't need to forward *any* HTLC's, as
// he was the one that initiated extending the commitment chain of
// Alice.
if len(fwdPkg.Adds) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.SettleFails))
}
// Now, begin another state transition led by Alice, and fail the second
// HTLC part-way through the dance.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatal(err)
}
// Failing the HTLC here will cause the update to be included in Alice's
// remote log, but it should not be committed by this transition.
err = bobChannel.FailHTLC(htlc2.ID, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(htlc2.ID, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
bobRevocation, _, err = bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// Alice should detect that she doesn't need to forward any Adds's, but
// that the Fail has been locked in an can be forwarded.
_, adds, settleFails, _, err := aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatal(err)
}
if len(adds) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(adds))
}
if len(settleFails) != 1 {
t.Fatalf("alice should only forward %d HTLC's, instead wants to "+
"forward %v htlcs", 1, len(settleFails))
}
if settleFails[0].ParentIndex != htlc.ID {
t.Fatalf("alice should forward fail for htlcid=%d, instead "+
"forwarding id=%d", htlc.ID,
settleFails[0].ParentIndex)
}
// We'll now restart both Alice and Bob. This emulates a reconnection
// between the two peers.
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart alice: %v", err)
}
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart bob: %v", err)
}
// Readd the Fail to both Alice and Bob's channels, as the non-committed
// update will not have survived the restart.
err = bobChannel.FailHTLC(htlc2.ID, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(htlc2.ID, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// Have Alice initiate a state transition, which does not include the
// HTLCs just readded to the channel state.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatal(err)
}
bobRevocation, _, err = bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// Alice should detect that she doesn't need to forward any HTLC's, as
// the updates haven't been committed by Bob yet.
fwdPkg, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatal(err)
}
if len(fwdPkg.Adds) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(fwdPkg.SettleFails))
}
// Now initiate a final update from Bob to lock in the final Fail.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatal(err)
}
aliceRevocation, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// Bob should detect that he has nothing to forward, as he hasn't
// received any HTLCs.
fwdPkg, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatal(err)
}
if len(fwdPkg.Adds) != 0 {
t.Fatalf("bob should forward 4 hltcs, instead has %v",
len(fwdPkg.Adds))
}
if len(fwdPkg.SettleFails) != 0 {
t.Fatalf("bob should forward 0 hltcs, instead has %v",
len(fwdPkg.SettleFails))
}
// Finally, have Bob initiate a state transition that locks in the Fail
// added after the restart.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatal(err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatal(err)
}
bobRevocation, _, err = bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatal(err)
}
// When Alice receives the revocation, she should detect that she
// can now forward the freshly locked-in Fail.
_, adds, settleFails, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatal(err)
}
if len(adds) != 0 {
t.Fatalf("alice shouldn't forward any HTLC's, instead wants to "+
"forward %v htlcs", len(adds))
}
if len(settleFails) != 1 {
t.Fatalf("alice should only forward one HTLC, instead wants to "+
"forward %v htlcs", len(settleFails))
}
if settleFails[0].ParentIndex != htlc2.ID {
t.Fatalf("alice should forward fail for htlcid=%d, instead "+
"forwarding id=%d", htlc2.ID,
settleFails[0].ParentIndex)
}
}
// TestInvalidCommitSigError tests that if the remote party sends us an invalid
// commitment signature, then we'll reject it and return a special error that
// contains information to allow the remote party to debug their issues.
func TestInvalidCommitSigError(t *testing.T) {
t.Parallel()
// First, we'll make a channel between Alice and Bob.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// With the channel established, we'll now send a single HTLC from
// Alice to Bob.
var htlcAmt lnwire.MilliSatoshi = 100000
htlc, _ := createHTLC(0, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Alice will now attempt to initiate a state transition.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign new commit: %v", err)
}
// Before the signature gets to Bob, we'll mutate it, such that the
// signature is now actually invalid.
aliceSig[0] ^= 88
// Bob should reject this new state, and return the proper error.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err == nil {
t.Fatalf("bob accepted invalid state but shouldn't have")
}
if _, ok := err.(*InvalidCommitSigError); !ok {
t.Fatalf("bob sent incorrect error, expected %T, got %T",
&InvalidCommitSigError{}, err)
}
}
// TestChannelUnilateralCloseHtlcResolution tests that in the case of a
// unilateral channel closure, then the party that didn't broadcast the
// commitment is able to properly sweep all relevant outputs.
func TestChannelUnilateralCloseHtlcResolution(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We'll start off the test by adding an HTLC in both directions, then
// initiating enough state transitions to lock both of them in.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
htlcBob, preimageBob := createHTLC(0, htlcAmount)
if _, err := bobChannel.AddHTLC(htlcBob, nil); err != nil {
t.Fatalf("bob unable to add htlc: %v", err)
}
if _, err := aliceChannel.ReceiveHTLC(htlcBob); err != nil {
t.Fatalf("alice unable to recv add htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("Can't update the channel state: %v", err)
}
// With both HTLC's locked in, we'll now simulate Bob force closing the
// transaction on Alice.
bobForceClose, err := bobChannel.ForceClose()
if err != nil {
t.Fatalf("unable to close: %v", err)
}
// We'll then use Bob's transaction to trigger a spend notification for
// Alice.
closeTx := bobForceClose.CloseTx
commitTxHash := closeTx.TxHash()
spendDetail := &chainntnfs.SpendDetail{
SpendingTx: closeTx,
SpenderTxHash: &commitTxHash,
}
aliceCloseSummary, err := NewUnilateralCloseSummary(
aliceChannel.channelState, aliceChannel.Signer,
spendDetail,
aliceChannel.channelState.RemoteCommitment,
aliceChannel.channelState.RemoteCurrentRevocation,
)
if err != nil {
t.Fatalf("unable to create alice close summary: %v", err)
}
// She should detect that she can sweep both the outgoing HTLC as well
// as the incoming one from Bob.
if len(aliceCloseSummary.HtlcResolutions.OutgoingHTLCs) != 1 {
t.Fatalf("alice out htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(aliceCloseSummary.HtlcResolutions.OutgoingHTLCs))
}
if len(aliceCloseSummary.HtlcResolutions.IncomingHTLCs) != 1 {
t.Fatalf("alice in htlc resolutions not populated: expected %v "+
"htlcs, got %v htlcs",
1, len(aliceCloseSummary.HtlcResolutions.IncomingHTLCs))
}
outHtlcResolution := aliceCloseSummary.HtlcResolutions.OutgoingHTLCs[0]
inHtlcResolution := aliceCloseSummary.HtlcResolutions.IncomingHTLCs[0]
// First, we'll ensure that Alice can directly spend the outgoing HTLC
// given a transaction with the proper lock time set.
receiverHtlcScript := closeTx.TxOut[outHtlcResolution.ClaimOutpoint.Index].PkScript
sweepTx := wire.NewMsgTx(2)
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: outHtlcResolution.ClaimOutpoint,
})
sweepTx.AddTxOut(&wire.TxOut{
PkScript: receiverHtlcScript,
Value: outHtlcResolution.SweepSignDesc.Output.Value,
})
outHtlcResolution.SweepSignDesc.InputIndex = 0
outHtlcResolution.SweepSignDesc.SigHashes = txscript.NewTxSigHashes(
sweepTx,
)
sweepTx.LockTime = outHtlcResolution.Expiry
// With the transaction constructed, we'll generate a witness that
// should be valid for it, and verify using an instance of Script.
sweepTx.TxIn[0].Witness, err = input.ReceiverHtlcSpendTimeout(
aliceChannel.Signer, &outHtlcResolution.SweepSignDesc,
sweepTx, int32(outHtlcResolution.Expiry),
)
if err != nil {
t.Fatalf("unable to witness: %v", err)
}
vm, err := txscript.NewEngine(
outHtlcResolution.SweepSignDesc.Output.PkScript,
sweepTx, 0, txscript.StandardVerifyFlags, nil,
nil, outHtlcResolution.SweepSignDesc.Output.Value,
)
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
// Next, we'll ensure that we're able to sweep the incoming HTLC with a
// similar sweep transaction, this time using the payment pre-image.
senderHtlcScript := closeTx.TxOut[inHtlcResolution.ClaimOutpoint.Index].PkScript
sweepTx = wire.NewMsgTx(2)
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: inHtlcResolution.ClaimOutpoint,
})
sweepTx.AddTxOut(&wire.TxOut{
PkScript: senderHtlcScript,
Value: inHtlcResolution.SweepSignDesc.Output.Value,
})
inHtlcResolution.SweepSignDesc.InputIndex = 0
inHtlcResolution.SweepSignDesc.SigHashes = txscript.NewTxSigHashes(
sweepTx,
)
sweepTx.TxIn[0].Witness, err = input.SenderHtlcSpendRedeem(
aliceChannel.Signer, &inHtlcResolution.SweepSignDesc,
sweepTx, preimageBob[:],
)
if err != nil {
t.Fatalf("unable to generate witness for success "+
"output: %v", err)
}
// Finally, we'll verify the constructed witness to ensure that Alice
// can properly sweep the output.
vm, err = txscript.NewEngine(
inHtlcResolution.SweepSignDesc.Output.PkScript,
sweepTx, 0, txscript.StandardVerifyFlags, nil,
nil, inHtlcResolution.SweepSignDesc.Output.Value,
)
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
}
// TestChannelUnilateralClosePendingCommit tests that if the remote party
// broadcasts their pending commit (hasn't yet revoked the lower one), then
// we'll create a proper unilateral channel clsoure that can sweep the created
// outputs.
func TestChannelUnilateralClosePendingCommit(t *testing.T) {
t.Parallel()
// Create a test channel which will be used for the duration of this
// unittest. The channel will be funded evenly with Alice having 5 BTC,
// and Bob having 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll add an HTLC from Alice to Bob, just to be be able to
// create a new state transition.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); 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, Alice's commitment chain should have a new pending
// commit for Bob. We'll extract it so we can simulate Bob broadcasting
// the commitment due to an issue.
bobCommit := aliceChannel.remoteCommitChain.tip().txn
bobTxHash := bobCommit.TxHash()
spendDetail := &chainntnfs.SpendDetail{
SpenderTxHash: &bobTxHash,
SpendingTx: bobCommit,
}
// At this point, if we attempt to create a unilateral close summary
// using this commitment, but with the wrong state, we should find that
// our output wasn't picked up.
aliceWrongCloseSummary, err := NewUnilateralCloseSummary(
aliceChannel.channelState, aliceChannel.Signer,
spendDetail,
aliceChannel.channelState.RemoteCommitment,
aliceChannel.channelState.RemoteCurrentRevocation,
)
if err != nil {
t.Fatalf("unable to create alice close summary: %v", err)
}
if aliceWrongCloseSummary.CommitResolution != nil {
t.Fatalf("alice shouldn't have found self output")
}
// If we create the close summary again, but this time use Alice's
// pending commit to Bob, then the unilateral close summary should be
// properly populated.
aliceRemoteChainTip, err := aliceChannel.channelState.RemoteCommitChainTip()
if err != nil {
t.Fatalf("unable to fetch remote chain tip: %v", err)
}
aliceCloseSummary, err := NewUnilateralCloseSummary(
aliceChannel.channelState, aliceChannel.Signer,
spendDetail,
aliceRemoteChainTip.Commitment,
aliceChannel.channelState.RemoteNextRevocation,
)
if err != nil {
t.Fatalf("unable to create alice close summary: %v", err)
}
// With this proper version, Alice's commit resolution should have been
// properly located.
if aliceCloseSummary.CommitResolution == nil {
t.Fatalf("unable to find alice's commit resolution")
}
// The proper short channel ID should also be set in Alice's close
// channel summary.
if aliceCloseSummary.ChannelCloseSummary.ShortChanID !=
aliceChannel.ShortChanID() {
t.Fatalf("wrong short chan ID, expected %v got %v",
aliceChannel.ShortChanID(),
aliceCloseSummary.ChannelCloseSummary.ShortChanID)
}
aliceSignDesc := aliceCloseSummary.CommitResolution.SelfOutputSignDesc
// Finally, we'll ensure that we're able to properly sweep our output
// from using the materials within the unilateral close summary.
sweepTx := wire.NewMsgTx(2)
sweepTx.AddTxIn(&wire.TxIn{
PreviousOutPoint: aliceCloseSummary.CommitResolution.SelfOutPoint,
})
sweepTx.AddTxOut(&wire.TxOut{
PkScript: testHdSeed[:],
Value: aliceSignDesc.Output.Value,
})
aliceSignDesc.SigHashes = txscript.NewTxSigHashes(sweepTx)
sweepTx.TxIn[0].Witness, err = input.CommitSpendNoDelay(
aliceChannel.Signer, &aliceSignDesc, sweepTx, false,
)
if err != nil {
t.Fatalf("unable to generate sweep witness: %v", err)
}
// If we validate the signature on the new sweep transaction, it should
// be fully valid.
vm, err := txscript.NewEngine(
aliceSignDesc.Output.PkScript, sweepTx, 0,
txscript.StandardVerifyFlags, nil, nil,
aliceSignDesc.Output.Value,
)
if err != nil {
t.Fatalf("unable to create engine: %v", err)
}
if err := vm.Execute(); err != nil {
t.Fatalf("htlc timeout spend is invalid: %v", err)
}
}
// TestDesyncHTLCs checks that we cannot add HTLCs that would make the
// balance negative, when the remote and local update logs are desynced.
func TestDesyncHTLCs(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First add one HTLC of value 4.1 BTC.
htlcAmt := lnwire.NewMSatFromSatoshis(4.1 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(0, htlcAmt)
aliceIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
bobIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Lock this HTLC in.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
// Now let Bob fail this HTLC.
err = bobChannel.FailHTLC(bobIndex, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
if err := aliceChannel.ReceiveFailHTLC(aliceIndex, []byte("bad")); err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// Alice now has gotten all her original balance (5 BTC) back, however,
// adding a new HTLC at this point SHOULD fail, since if she adds the
// HTLC and signs the next state, Bob cannot assume she received the
// FailHTLC, and must assume she doesn't have the necessary balance
// available.
//
// We try adding an HTLC of value 1 BTC, which should fail because the
// balance is unavailable.
htlcAmt = lnwire.NewMSatFromSatoshis(1 * btcutil.SatoshiPerBitcoin)
htlc, _ = createHTLC(1, htlcAmt)
if _, err = aliceChannel.AddHTLC(htlc, nil); err != ErrBelowChanReserve {
t.Fatalf("expected ErrInsufficientBalance, instead received: %v",
err)
}
// Now do a state transition, which will ACK the FailHTLC, making Alice
// able to add the new HTLC.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
if _, err = aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
}
// TODO(roasbeef): testing.Quick test case for retrans!!!
// TestMaxAcceptedHTLCs tests that the correct error message (ErrMaxHTLCNumber)
// is thrown when a node tries to accept more than MaxAcceptedHTLCs in a
// channel.
func TestMaxAcceptedHTLCs(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// One over the maximum number of HTLCs that either can accept.
const numHTLCs = 12
// Set the remote's required MaxAcceptedHtlcs. This means that Alice
// can only offer the remote up to numHTLCs HTLCs.
aliceChannel.channelState.LocalChanCfg.MaxAcceptedHtlcs = numHTLCs
bobChannel.channelState.RemoteChanCfg.MaxAcceptedHtlcs = numHTLCs
// Similarly, set the remote config's MaxAcceptedHtlcs. This means
// that the remote will be aware that Bob will only accept up to
// numHTLCs at a time.
aliceChannel.channelState.RemoteChanCfg.MaxAcceptedHtlcs = numHTLCs
bobChannel.channelState.LocalChanCfg.MaxAcceptedHtlcs = numHTLCs
// Each HTLC amount is 0.1 BTC.
htlcAmt := lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
// htlcID is used to keep track of the HTLC that Bob will fail back to
// Alice.
var htlcID uint64
// Send the maximum allowed number of HTLCs.
for i := 0; i < numHTLCs; i++ {
htlc, _ := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Just assign htlcID to the last received HTLC.
htlcID = htlc.ID
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to transition state: %v", err)
}
// The next HTLC should fail with ErrMaxHTLCNumber.
htlc, _ := createHTLC(numHTLCs, htlcAmt)
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrMaxHTLCNumber {
t.Fatalf("expected ErrMaxHTLCNumber, instead received: %v", err)
}
// Receiving the next HTLC should fail.
if _, err := bobChannel.ReceiveHTLC(htlc); err != ErrMaxHTLCNumber {
t.Fatalf("expected ErrMaxHTLCNumber, instead received: %v", err)
}
// Bob will fail the htlc specified by htlcID and then force a state
// transition.
err = bobChannel.FailHTLC(htlcID, []byte{}, nil, nil, nil)
if err != nil {
t.Fatalf("unable to fail htlc: %v", err)
}
if err := aliceChannel.ReceiveFailHTLC(htlcID, []byte{}); err != nil {
t.Fatalf("unable to receive fail htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to transition state: %v", err)
}
// Bob should succeed in adding a new HTLC since a previous HTLC was just
// failed. We use numHTLCs here since the previous AddHTLC with this index
// failed.
htlc, _ = createHTLC(numHTLCs, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Add a commitment to Bob's commitment chain.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign next commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to recv new commitment: %v", err)
}
// The next HTLC should fail with ErrMaxHTLCNumber. The index is incremented
// by one.
htlc, _ = createHTLC(numHTLCs+1, htlcAmt)
if _, err = aliceChannel.AddHTLC(htlc, nil); err != ErrMaxHTLCNumber {
t.Fatalf("expected ErrMaxHTLCNumber, instead received: %v", err)
}
// Likewise, Bob should not be able to receive this HTLC if Alice can't
// add it.
if _, err := bobChannel.ReceiveHTLC(htlc); err != ErrMaxHTLCNumber {
t.Fatalf("expected ErrMaxHTLCNumber, instead received: %v", err)
}
}
// TestMaxAsynchronousHtlcs tests that Bob correctly receives (and does not
// fail) an HTLC from Alice when exchanging asynchronous payments. We want to
// mimic the following case where Bob's commitment transaction is full before
// starting:
// Alice Bob
// 1. <---settle/fail---
// 2. <-------sig-------
// 3. --------sig------> (covers an add sent before step 1)
// 4. <-------rev-------
// 5. --------rev------>
// 6. --------add------>
// 7. - - - - sig - - ->
// This represents an asynchronous commitment dance in which both sides are
// sending signatures at the same time. In step 3, the signature does not
// cover the recent settle/fail that Bob sent in step 1. However, the add that
// Alice sends to Bob in step 6 does not overflow Bob's commitment transaction.
// This is because validateCommitmentSanity counts the HTLC's by ignoring
// HTLC's which will be removed in the next signature that Alice sends. Thus,
// the add won't overflow. This is because the signature received in step 7
// covers the settle/fail in step 1 and makes space for the add in step 6.
func TestMaxAsynchronousHtlcs(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// One over the maximum number of HTLCs that either can accept.
const numHTLCs = 12
// Set the remote's required MaxAcceptedHtlcs. This means that Alice
// can only offer the remote up to numHTLCs HTLCs.
aliceChannel.channelState.LocalChanCfg.MaxAcceptedHtlcs = numHTLCs
bobChannel.channelState.RemoteChanCfg.MaxAcceptedHtlcs = numHTLCs
// Similarly, set the remote config's MaxAcceptedHtlcs. This means
// that the remote will be aware that Bob will only accept up to
// numHTLCs at a time.
aliceChannel.channelState.RemoteChanCfg.MaxAcceptedHtlcs = numHTLCs
bobChannel.channelState.LocalChanCfg.MaxAcceptedHtlcs = numHTLCs
// Each HTLC amount is 0.1 BTC.
htlcAmt := lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
var htlcID uint64
// Send the maximum allowed number of HTLCs minus one.
for i := 0; i < numHTLCs-1; i++ {
htlc, _ := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Just assign htlcID to the last received HTLC.
htlcID = htlc.ID
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to transition state: %v", err)
}
// Send an HTLC to Bob so that Bob's commitment transaction is full.
htlc, _ := createHTLC(numHTLCs-1, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Fail back an HTLC and sign a commitment as in steps 1 & 2.
err = bobChannel.FailHTLC(htlcID, []byte{}, nil, nil, nil)
if err != nil {
t.Fatalf("unable to fail htlc: %v", err)
}
if err := aliceChannel.ReceiveFailHTLC(htlcID, []byte{}); err != nil {
t.Fatalf("unable to receive fail htlc: %v", err)
}
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign next commitment: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive new commitment: %v", err)
}
// Cover the HTLC referenced with id equal to numHTLCs-1 with a new
// signature (step 3).
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign next commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive new commitment: %v", err)
}
// Both sides exchange revocations as in step 4 & 5.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke revocation: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to receive revocation: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke revocation: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("unable to receive revocation: %v", err)
}
// Send the final Add which should succeed as in step 6.
htlc, _ = createHTLC(numHTLCs, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Receiving the commitment should succeed as in step 7 since space was
// made.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign next commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive new commitment: %v", err)
}
}
// TestMaxPendingAmount tests that the maximum overall pending HTLC value is met
// given several HTLCs that, combined, exceed this value. An ErrMaxPendingAmount
// error should be returned.
func TestMaxPendingAmount(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We set the remote required MaxPendingAmount to 3 BTC. We will
// attempt to overflow this value and see if it gives us the
// ErrMaxPendingAmount error.
maxPending := lnwire.NewMSatFromSatoshis(btcutil.SatoshiPerBitcoin * 3)
// We set the max pending amount of Alice's config. This mean that she
// cannot offer Bob HTLCs with a total value above this limit at a given
// time.
aliceChannel.channelState.LocalChanCfg.MaxPendingAmount = maxPending
bobChannel.channelState.RemoteChanCfg.MaxPendingAmount = maxPending
// First, we'll add 2 HTLCs of 1.5 BTC each to Alice's commitment.
// This won't trigger Alice's ErrMaxPendingAmount error.
const numHTLCs = 2
htlcAmt := lnwire.NewMSatFromSatoshis(1.5 * btcutil.SatoshiPerBitcoin)
for i := 0; i < numHTLCs; i++ {
htlc, _ := createHTLC(i, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
}
// We finally add one more HTLC of 0.1 BTC to Alice's commitment. This
// SHOULD trigger Alice's ErrMaxPendingAmount error.
htlcAmt = lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(numHTLCs, htlcAmt)
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrMaxPendingAmount {
t.Fatalf("expected ErrMaxPendingAmount, instead received: %v", err)
}
// And also Bob shouldn't be accepting this HTLC upon calling ReceiveHTLC.
if _, err := bobChannel.ReceiveHTLC(htlc); err != ErrMaxPendingAmount {
t.Fatalf("expected ErrMaxPendingAmount, instead received: %v", err)
}
}
func assertChannelBalances(t *testing.T, alice, bob *LightningChannel,
aliceBalance, bobBalance btcutil.Amount) {
_, _, line, _ := runtime.Caller(1)
aliceSelfBalance := alice.channelState.LocalCommitment.LocalBalance.ToSatoshis()
aliceBobBalance := alice.channelState.LocalCommitment.RemoteBalance.ToSatoshis()
if aliceSelfBalance != aliceBalance {
t.Fatalf("line #%v: wrong alice self balance: expected %v, got %v",
line, aliceBalance, aliceSelfBalance)
}
if aliceBobBalance != bobBalance {
t.Fatalf("line #%v: wrong alice bob's balance: expected %v, got %v",
line, bobBalance, aliceBobBalance)
}
bobSelfBalance := bob.channelState.LocalCommitment.LocalBalance.ToSatoshis()
bobAliceBalance := bob.channelState.LocalCommitment.RemoteBalance.ToSatoshis()
if bobSelfBalance != bobBalance {
t.Fatalf("line #%v: wrong bob self balance: expected %v, got %v",
line, bobBalance, bobSelfBalance)
}
if bobAliceBalance != aliceBalance {
t.Fatalf("line #%v: wrong alice bob's balance: expected %v, got %v",
line, aliceBalance, bobAliceBalance)
}
}
// TestChanReserve tests that the ErrBelowChanReserve error is thrown when an
// HTLC is added that causes a node's balance to dip below its channel reserve
// limit.
func TestChanReserve(t *testing.T) {
t.Parallel()
setupChannels := func() (*LightningChannel, *LightningChannel, func()) {
// We'll kick off the test by creating our channels which both
// are loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
// We set the remote required ChanReserve to 0.5 BTC. We will
// attempt to cause Alice's balance to dip below this amount
// and test whether it triggers the ErrBelowChanReserve error.
aliceMinReserve := btcutil.Amount(0.5 *
btcutil.SatoshiPerBitcoin)
// Alice will need to keep her reserve above aliceMinReserve,
// so set this limit to here local config.
aliceChannel.channelState.LocalChanCfg.ChanReserve = aliceMinReserve
// During channel opening Bob will also get to know Alice's
// minimum reserve, and this will be found in his remote
// config.
bobChannel.channelState.RemoteChanCfg.ChanReserve = aliceMinReserve
// We set Bob's channel reserve to a value that is larger than
// his current balance in the channel. This will ensure that
// after a channel is first opened, Bob can still receive HTLCs
// even though his balance is less than his channel reserve.
bobMinReserve := btcutil.Amount(6 * btcutil.SatoshiPerBitcoin)
bobChannel.channelState.LocalChanCfg.ChanReserve = bobMinReserve
aliceChannel.channelState.RemoteChanCfg.ChanReserve = bobMinReserve
return aliceChannel, bobChannel, cleanUp
}
aliceChannel, bobChannel, cleanUp := setupChannels()
defer cleanUp()
aliceIndex := 0
bobIndex := 0
// Add an HTLC that will increase Bob's balance. This should succeed,
// since Alice stays above her channel reserve, and Bob increases his
// balance (while still being below his channel reserve).
//
// Resulting balances:
// Alice: 4.5
// Bob: 5.0
htlcAmt := lnwire.NewMSatFromSatoshis(0.5 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(aliceIndex, htlcAmt)
aliceIndex++
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Force a state transition, making sure this HTLC is considered valid
// even though the channel reserves are not met.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
commitFee := aliceChannel.channelState.LocalCommitment.CommitFee
assertChannelBalances(
t, aliceChannel, bobChannel,
btcutil.SatoshiPerBitcoin*4.5-commitFee, btcutil.SatoshiPerBitcoin*5,
)
// Now let Bob try to add an HTLC. This should fail, since it will
// decrease his balance, which is already below the channel reserve.
//
// Resulting balances:
// Alice: 4.5
// Bob: 5.0
htlc, _ = createHTLC(bobIndex, htlcAmt)
bobIndex++
_, err := bobChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
// Alice will reject this htlc upon receiving the htlc.
if _, err := aliceChannel.ReceiveHTLC(htlc); err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
// We must setup the channels again, since a violation of the channel
// constraints leads to channel shutdown.
aliceChannel, bobChannel, cleanUp = setupChannels()
defer cleanUp()
aliceIndex = 0
bobIndex = 0
// Now we'll add HTLC of 3.5 BTC to Alice's commitment, this should put
// Alice's balance at 1.5 BTC.
//
// Resulting balances:
// Alice: 1.5
// Bob: 9.5
htlcAmt = lnwire.NewMSatFromSatoshis(3.5 * btcutil.SatoshiPerBitcoin)
// The first HTLC should successfully be sent.
htlc, _ = createHTLC(aliceIndex, htlcAmt)
aliceIndex++
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Add a second HTLC of 1 BTC. This should fail because it will take
// Alice's balance all the way down to her channel reserve, but since
// she is the initiator the additional transaction fee makes her
// balance dip below.
htlcAmt = lnwire.NewMSatFromSatoshis(1 * btcutil.SatoshiPerBitcoin)
htlc, _ = createHTLC(aliceIndex, htlcAmt)
aliceIndex++
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
// Likewise, Bob will reject receiving the htlc because of the same reason.
if _, err := bobChannel.ReceiveHTLC(htlc); err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
// We must setup the channels again, since a violation of the channel
// constraints leads to channel shutdown.
aliceChannel, bobChannel, cleanUp = setupChannels()
defer cleanUp()
aliceIndex = 0
bobIndex = 0
// Add a HTLC of 2 BTC to Alice, and the settle it.
// Resulting balances:
// Alice: 3.0
// Bob: 7.0
htlcAmt = lnwire.NewMSatFromSatoshis(2 * btcutil.SatoshiPerBitcoin)
htlc, preimage := createHTLC(aliceIndex, htlcAmt)
aliceIndex++
aliceHtlcIndex, err := aliceChannel.AddHTLC(htlc, nil)
if err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
bobHtlcIndex, err := bobChannel.ReceiveHTLC(htlc)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
commitFee = aliceChannel.channelState.LocalCommitment.CommitFee
assertChannelBalances(
t, aliceChannel, bobChannel,
btcutil.SatoshiPerBitcoin*3-commitFee, btcutil.SatoshiPerBitcoin*5,
)
if err := bobChannel.SettleHTLC(preimage, bobHtlcIndex, nil, nil, nil); err != nil {
t.Fatalf("bob unable to settle inbound htlc: %v", err)
}
if err := aliceChannel.ReceiveHTLCSettle(preimage, aliceHtlcIndex); err != nil {
t.Fatalf("alice unable to accept settle of outbound htlc: %v", err)
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
commitFee = aliceChannel.channelState.LocalCommitment.CommitFee
assertChannelBalances(
t, aliceChannel, bobChannel,
btcutil.SatoshiPerBitcoin*3-commitFee, btcutil.SatoshiPerBitcoin*7,
)
// And now let Bob add an HTLC of 1 BTC. This will take Bob's balance
// all the way down to his channel reserve, but since he is not paying
// the fee this is okay.
htlcAmt = lnwire.NewMSatFromSatoshis(1 * btcutil.SatoshiPerBitcoin)
htlc, _ = createHTLC(bobIndex, htlcAmt)
bobIndex++
if _, err := bobChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := aliceChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// Do a last state transition, which should succeed.
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
commitFee = aliceChannel.channelState.LocalCommitment.CommitFee
assertChannelBalances(
t, aliceChannel, bobChannel,
btcutil.SatoshiPerBitcoin*3-commitFee, btcutil.SatoshiPerBitcoin*6,
)
}
// TestChanReserveRemoteInitiator tests that the channel reserve of the
// initiator is accounted for when adding HTLCs, whether the initiator is the
// local or remote node.
func TestChanReserveRemoteInitiator(t *testing.T) {
t.Parallel()
// We start out with a channel where both parties have 5 BTC.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatal(err)
}
defer cleanUp()
// Set Alice's channel reserve to be 5 BTC-commitfee. This means she
// has just enough balance to cover the comitment fee, but not enough
// to add any more HTLCs to the commitment. Although a reserve this
// high is unrealistic, a channel can easiliy get into a situation
// where the initiator cannot pay for the fee of any more HTLCs.
commitFee := aliceChannel.channelState.LocalCommitment.CommitFee
aliceMinReserve := 5*btcutil.SatoshiPerBitcoin - commitFee
aliceChannel.channelState.LocalChanCfg.ChanReserve = aliceMinReserve
bobChannel.channelState.RemoteChanCfg.ChanReserve = aliceMinReserve
// Now let Bob attempt to add an HTLC of 0.1 BTC. He has plenty of
// money available to spend, but Alice, which is the initiator, cannot
// afford any more HTLCs on the commitment transaction because that
// would take here below her channel reserve..
htlcAmt := lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(0, htlcAmt)
// Bob should refuse to add this HTLC, since he realizes it will create
// an invalid commitment.
_, err = bobChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v",
err)
}
// Of course Alice will also not have enough balance to add it herself.
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v",
err)
}
// Same for Alice, she should refuse to accept this second HTLC.
if _, err := aliceChannel.ReceiveHTLC(htlc); err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
}
// TestChanReserveLocalInitiatorDustHtlc tests that fee the initiator must pay
// when adding HTLCs is accounted for, even though the HTLC is considered dust
// by the remote bode.
func TestChanReserveLocalInitiatorDustHtlc(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatal(err)
}
defer cleanUp()
// The amount of the HTLC should not be considered dust according to
// Alice's dust limit (200 sat), but be dust according to Bob's dust
// limit (1300 sat). It is considered dust if the amount remaining
// after paying the HTLC fee is below the dustlimit, so we choose a
// size of 500+htlcFee.
htlcSat := btcutil.Amount(500) + HtlcTimeoutFee(
aliceChannel.channelState.ChanType,
chainfee.SatPerKWeight(
aliceChannel.channelState.LocalCommitment.FeePerKw,
),
)
// Set Alice's channel reserve to be low enough to carry the value of
// the HTLC, but not low enough to allow the extra fee from adding the
// HTLC to the commitment.
commitFee := aliceChannel.channelState.LocalCommitment.CommitFee
aliceMinReserve := 5*btcutil.SatoshiPerBitcoin - commitFee - htlcSat
aliceChannel.channelState.LocalChanCfg.ChanReserve = aliceMinReserve
bobChannel.channelState.RemoteChanCfg.ChanReserve = aliceMinReserve
htlcDustAmt := lnwire.NewMSatFromSatoshis(htlcSat)
htlc, _ := createHTLC(0, htlcDustAmt)
// Alice should realize that the fee she must pay to add this HTLC to
// the local commitment would take her below the channel reserve.
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrBelowChanReserve {
t.Fatalf("expected ErrBelowChanReserve, instead received: %v", err)
}
}
// TestMinHTLC tests that the ErrBelowMinHTLC error is thrown if an HTLC is added
// that is below the minimm allowed value for HTLCs.
func TestMinHTLC(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We set Alice's MinHTLC to 0.1 BTC. We will attempt to send an
// HTLC BELOW this value to trigger the ErrBelowMinHTLC error.
minValue := lnwire.NewMSatFromSatoshis(0.1 * btcutil.SatoshiPerBitcoin)
// Setting the min value in Alice's local config means that the
// remote will not accept any HTLCs of value less than specified.
aliceChannel.channelState.LocalChanCfg.MinHTLC = minValue
bobChannel.channelState.RemoteChanCfg.MinHTLC = minValue
// First, we will add an HTLC of 0.5 BTC. This will not trigger
// ErrBelowMinHTLC.
htlcAmt := lnwire.NewMSatFromSatoshis(0.5 * btcutil.SatoshiPerBitcoin)
htlc, _ := createHTLC(0, htlcAmt)
if _, err := aliceChannel.AddHTLC(htlc, nil); err != nil {
t.Fatalf("unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlc); err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
// We add an HTLC below the min value, this should result in
// an ErrBelowMinHTLC error.
amt := minValue - 100
htlc, _ = createHTLC(1, amt)
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrBelowMinHTLC {
t.Fatalf("expected ErrBelowMinHTLC, instead received: %v", err)
}
// Bob will receive this HTLC, but reject the next received htlc, since
// the htlc is too small.
_, err = bobChannel.ReceiveHTLC(htlc)
if err != ErrBelowMinHTLC {
t.Fatalf("expected ErrBelowMinHTLC, instead received: %v", err)
}
}
// TestInvalidHTLCAmt tests that ErrInvalidHTLCAmt is returned when trying to
// add HTLCs that don't carry a positive value.
func TestInvalidHTLCAmt(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// We'll set the min HTLC values for each party to zero, which
// technically would permit zero-value HTLCs.
aliceChannel.channelState.LocalChanCfg.MinHTLC = 0
bobChannel.channelState.RemoteChanCfg.MinHTLC = 0
// Create a zero-value HTLC.
htlcAmt := lnwire.MilliSatoshi(0)
htlc, _ := createHTLC(0, htlcAmt)
// Sending or receiving the HTLC should fail with ErrInvalidHTLCAmt.
_, err = aliceChannel.AddHTLC(htlc, nil)
if err != ErrInvalidHTLCAmt {
t.Fatalf("expected ErrInvalidHTLCAmt, got: %v", err)
}
_, err = bobChannel.ReceiveHTLC(htlc)
if err != ErrInvalidHTLCAmt {
t.Fatalf("expected ErrInvalidHTLCAmt, got: %v", err)
}
}
// TestNewBreachRetributionSkipsDustHtlcs ensures that in the case of a
// contract breach, all dust HTLCs are ignored and not reflected in the
// produced BreachRetribution struct. We ignore these HTLCs as they aren't
// actually manifested on the commitment transaction, as a result we can't
// actually revoked them.
func TestNewBreachRetributionSkipsDustHtlcs(t *testing.T) {
t.Parallel()
// We'll kick off the test by creating our channels which both are
// loaded with 5 BTC each.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
var fakeOnionBlob [lnwire.OnionPacketSize]byte
copy(fakeOnionBlob[:], bytes.Repeat([]byte{0x05}, lnwire.OnionPacketSize))
// We'll modify the dust settings on both channels to be a predictable
// value for the prurpose of the test.
dustValue := btcutil.Amount(200)
aliceChannel.channelState.LocalChanCfg.DustLimit = dustValue
aliceChannel.channelState.RemoteChanCfg.DustLimit = dustValue
bobChannel.channelState.LocalChanCfg.DustLimit = dustValue
bobChannel.channelState.RemoteChanCfg.DustLimit = dustValue
// We'll now create a series of dust HTLC's, and send then from Alice
// to Bob, finally locking both of them in.
var bobPreimage [32]byte
copy(bobPreimage[:], bytes.Repeat([]byte{0xbb}, 32))
for i := 0; i < 3; i++ {
rHash := sha256.Sum256(bobPreimage[:])
h := &lnwire.UpdateAddHTLC{
PaymentHash: rHash,
Amount: lnwire.NewMSatFromSatoshis(dustValue),
Expiry: uint32(10),
OnionBlob: fakeOnionBlob,
}
htlcIndex, err := aliceChannel.AddHTLC(h, nil)
if err != nil {
t.Fatalf("unable to add bob's htlc: %v", err)
}
h.ID = htlcIndex
if _, err := bobChannel.ReceiveHTLC(h); err != nil {
t.Fatalf("unable to recv bob's htlc: %v", err)
}
}
// With the HTLC's applied to both update logs, we'll initiate a state
// transition from Alice.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete alice's state transition: %v", err)
}
// At this point, we'll capture the current state number, as well as
// the current commitment.
revokedStateNum := aliceChannel.channelState.LocalCommitment.CommitHeight
// We'll now have Bob settle those HTLC's to Alice and then advance
// forward to a new state.
for i := 0; i < 3; i++ {
err := bobChannel.SettleHTLC(bobPreimage, uint64(i), nil, nil, nil)
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(bobPreimage, uint64(i))
if err != nil {
t.Fatalf("unable to settle htlc: %v", err)
}
}
if err := ForceStateTransition(bobChannel, aliceChannel); err != nil {
t.Fatalf("unable to complete bob's state transition: %v", err)
}
// At this point, we'll now simulate a contract breach by Bob using the
// NewBreachRetribution method.
breachRet, err := NewBreachRetribution(
aliceChannel.channelState, revokedStateNum, 100,
)
if err != nil {
t.Fatalf("unable to create breach retribution: %v", err)
}
// The retribution shouldn't have any HTLCs set as they were all below
// dust for both parties.
if len(breachRet.HtlcRetributions) != 0 {
t.Fatalf("zero HTLC retributions should have been created, "+
"instead %v were", len(breachRet.HtlcRetributions))
}
}
// compareHtlcs compares two PaymentDescriptors.
func compareHtlcs(htlc1, htlc2 *PaymentDescriptor) error {
if htlc1.LogIndex != htlc2.LogIndex {
return fmt.Errorf("htlc log index did not match")
}
if htlc1.HtlcIndex != htlc2.HtlcIndex {
return fmt.Errorf("htlc index did not match")
}
if htlc1.ParentIndex != htlc2.ParentIndex {
return fmt.Errorf("htlc parent index did not match")
}
if htlc1.RHash != htlc2.RHash {
return fmt.Errorf("htlc rhash did not match")
}
return nil
}
// compareIndexes is a helper method to compare two index maps.
func compareIndexes(a, b map[uint64]*list.Element) error {
for k1, e1 := range a {
e2, ok := b[k1]
if !ok {
return fmt.Errorf("element with key %d "+
"not found in b", k1)
}
htlc1, htlc2 := e1.Value.(*PaymentDescriptor), e2.Value.(*PaymentDescriptor)
if err := compareHtlcs(htlc1, htlc2); err != nil {
return err
}
}
for k1, e1 := range b {
e2, ok := a[k1]
if !ok {
return fmt.Errorf("element with key %d not "+
"found in a", k1)
}
htlc1, htlc2 := e1.Value.(*PaymentDescriptor), e2.Value.(*PaymentDescriptor)
if err := compareHtlcs(htlc1, htlc2); err != nil {
return err
}
}
return nil
}
// compareLogs is a helper method to compare two updateLogs.
func compareLogs(a, b *updateLog) error {
if a.logIndex != b.logIndex {
return fmt.Errorf("log indexes don't match: %d vs %d",
a.logIndex, b.logIndex)
}
if a.htlcCounter != b.htlcCounter {
return fmt.Errorf("htlc counters don't match: %d vs %d",
a.htlcCounter, b.htlcCounter)
}
if err := compareIndexes(a.updateIndex, b.updateIndex); err != nil {
return fmt.Errorf("update indexes don't match: %v", err)
}
if err := compareIndexes(a.htlcIndex, b.htlcIndex); err != nil {
return fmt.Errorf("htlc indexes don't match: %v", err)
}
if a.Len() != b.Len() {
return fmt.Errorf("list lengths not equal: %d vs %d",
a.Len(), b.Len())
}
e1, e2 := a.Front(), b.Front()
for ; e1 != nil; e1, e2 = e1.Next(), e2.Next() {
htlc1, htlc2 := e1.Value.(*PaymentDescriptor), e2.Value.(*PaymentDescriptor)
if err := compareHtlcs(htlc1, htlc2); err != nil {
return err
}
}
return nil
}
// TestChannelRestoreUpdateLogs makes sure we are able to properly restore the
// update logs in the case where a different number of HTLCs are locked in on
// the local, remote and pending remote commitment.
func TestChannelRestoreUpdateLogs(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll add an HTLC from Alice to Bob, which we will lock in on
// Bob's commit, but not on Alice's.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// Let Alice sign a new state, which will include the HTLC just sent.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// Bob receives this commitment signature, and revokes his old state.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
// When Alice now receives this revocation, she will advance her remote
// commitment chain to the commitment which includes the HTLC just
// sent. However her local commitment chain still won't include the
// state with the HTLC, since she hasn't received a new commitment
// signature from Bob yet.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to recive revocation: %v", err)
}
// Now make Alice send and sign an additional HTLC. We don't let Bob
// receive it. We do this since we want to check that update logs are
// restored properly below, and we'll only restore updates that have
// been ACKed.
htlcAlice, _ = createHTLC(1, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
// Send the signature covering the HTLC. This is okay, since the local
// and remote commit chains are updated in an async fashion. Since the
// remote chain was updated with the latest state (since Bob sent the
// revocation earlier) we can keep advancing the remote commit chain.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// After Alice has signed this commitment, her local commitment will
// contain no HTLCs, her remote commitment will contain an HTLC with
// index 0, and the pending remote commitment (a signed remote
// commitment which is not AKCed yet) will contain an additional HTLC
// with index 1.
// We now re-create the channels, mimicking a restart. This should sync
// the update logs up to the correct state set up above.
newAliceChannel, err := NewLightningChannel(
aliceChannel.Signer, aliceChannel.channelState,
aliceChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
newBobChannel, err := NewLightningChannel(
bobChannel.Signer, bobChannel.channelState,
bobChannel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
// compare all the logs between the old and new channels, to make sure
// they all got restored properly.
err = compareLogs(aliceChannel.localUpdateLog,
newAliceChannel.localUpdateLog)
if err != nil {
t.Fatalf("alice local log not restored: %v", err)
}
err = compareLogs(aliceChannel.remoteUpdateLog,
newAliceChannel.remoteUpdateLog)
if err != nil {
t.Fatalf("alice remote log not restored: %v", err)
}
err = compareLogs(bobChannel.localUpdateLog,
newBobChannel.localUpdateLog)
if err != nil {
t.Fatalf("bob local log not restored: %v", err)
}
err = compareLogs(bobChannel.remoteUpdateLog,
newBobChannel.remoteUpdateLog)
if err != nil {
t.Fatalf("bob remote log not restored: %v", err)
}
}
// fetchNumUpdates counts the number of updateType in the log.
func fetchNumUpdates(t updateType, log *updateLog) int {
num := 0
for e := log.Front(); e != nil; e = e.Next() {
htlc := e.Value.(*PaymentDescriptor)
if htlc.EntryType == t {
num++
}
}
return num
}
// assertInLog checks that the given log contains the expected number of Adds
// and Fails.
func assertInLog(t *testing.T, log *updateLog, numAdds, numFails int) {
adds := fetchNumUpdates(Add, log)
if adds != numAdds {
t.Fatalf("expected %d adds, found %d", numAdds, adds)
}
fails := fetchNumUpdates(Fail, log)
if fails != numFails {
t.Fatalf("expected %d fails, found %d", numFails, fails)
}
}
// assertInLogs asserts that the expected number of Adds and Fails occurs in
// the local and remote update log of the given channel.
func assertInLogs(t *testing.T, channel *LightningChannel, numAddsLocal,
numFailsLocal, numAddsRemote, numFailsRemote int) {
assertInLog(t, channel.localUpdateLog, numAddsLocal, numFailsLocal)
assertInLog(t, channel.remoteUpdateLog, numAddsRemote, numFailsRemote)
}
// restoreAndAssert creates a new LightningChannel from the given channel's
// state, and asserts that the new channel has had its logs restored to the
// expected state.
func restoreAndAssert(t *testing.T, channel *LightningChannel, numAddsLocal,
numFailsLocal, numAddsRemote, numFailsRemote int) {
newChannel, err := NewLightningChannel(
channel.Signer, channel.channelState,
channel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
assertInLog(t, newChannel.localUpdateLog, numAddsLocal, numFailsLocal)
assertInLog(t, newChannel.remoteUpdateLog, numAddsRemote, numFailsRemote)
}
// TestChannelRestoreUpdateLogsFailedHTLC runs through a scenario where an
// HTLC is added and failed, and asserts along the way that we would restore
// the update logs of the channel to the expected state at any point.
func TestChannelRestoreUpdateLogsFailedHTLC(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll add an HTLC from Alice to Bob, and lock it in for both.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
// The htlc Alice sent should be in her local update log.
assertInLogs(t, aliceChannel, 1, 0, 0, 0)
// A restore at this point should NOT restore this update, as it is not
// locked in anywhere yet.
restoreAndAssert(t, aliceChannel, 0, 0, 0, 0)
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// Lock in the Add on both sides.
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
// Since it is locked in, Alice should have the Add in the local log,
// and it should be restored during restoration.
assertInLogs(t, aliceChannel, 1, 0, 0, 0)
restoreAndAssert(t, aliceChannel, 1, 0, 0, 0)
// Now we make Bob fail this HTLC.
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(0, []byte("failreason"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// This Fail update should have been added to Alice's remote update log.
assertInLogs(t, aliceChannel, 1, 0, 0, 1)
// Restoring should restore the HTLC added to Alice's local log, but
// NOT the Fail sent by Bob, since it is not locked in.
restoreAndAssert(t, aliceChannel, 1, 0, 0, 0)
// Bob sends a signature.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
// When Alice receives Bob's new commitment, the logs will stay the
// same until she revokes her old state. The Fail will still not be
// restored during a restoration.
assertInLogs(t, aliceChannel, 1, 0, 0, 1)
restoreAndAssert(t, aliceChannel, 1, 0, 0, 0)
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("bob unable to process alice's revocation: %v", err)
}
// At this point Alice has advanced her local commitment chain to a
// commitment with no HTLCs left. The current state on her remote
// commitment chain, however, still has the HTLC active, as she hasn't
// sent a new signature yet. If we'd now restart and restore, the htlc
// failure update should still be waiting for inclusion in Alice's next
// signature. Otherwise the produced signature would be invalid.
assertInLogs(t, aliceChannel, 1, 0, 0, 1)
restoreAndAssert(t, aliceChannel, 1, 0, 0, 1)
// Now send a signature from Alice. This will give Bob a new commitment
// where the HTLC is removed.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
// When sending a new commitment, Alice will add a pending commit to
// her remote chain. Since the unsigned acked updates aren't deleted
// until we receive a revocation, the fail should still be present.
assertInLogs(t, aliceChannel, 1, 0, 0, 1)
restoreAndAssert(t, aliceChannel, 1, 0, 0, 1)
// When Alice receives Bob's revocation, the Fail is irrevocably locked
// in on both sides. She should compact the logs, removing the HTLC and
// the corresponding Fail from the local update log.
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to receive revocation: %v", err)
}
assertInLogs(t, aliceChannel, 0, 0, 0, 0)
restoreAndAssert(t, aliceChannel, 0, 0, 0, 0)
}
// TestDuplicateFailRejection tests that if either party attempts to fail an
// HTLC twice, then we'll reject the second fail attempt.
func TestDuplicateFailRejection(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll add an HTLC from Alice to Bob, and lock it in for both
// parties.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
_, err = bobChannel.ReceiveHTLC(htlcAlice)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
// With the HTLC locked in, we'll now have Bob fail the HTLC back to
// Alice.
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
if err := aliceChannel.ReceiveFailHTLC(0, []byte("bad")); err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// If we attempt to fail it AGAIN, then both sides should reject this
// second failure attempt.
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
if err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
if err := aliceChannel.ReceiveFailHTLC(0, []byte("bad")); err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
// We'll now have Bob sign a new commitment to lock in the HTLC fail
// for Alice.
_, _, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commit: %v", err)
}
// We'll now force a restart for Bob and Alice, so we can test the
// persistence related portion of this assertion.
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
// If we try to fail the same HTLC again, then we should get an error.
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
if err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
// Alice on the other hand should accept the failure again, as she
// dropped all items in the logs which weren't committed.
if err := aliceChannel.ReceiveFailHTLC(0, []byte("bad")); err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
}
// TestDuplicateSettleRejection tests that if either party attempts to settle
// an HTLC twice, then we'll reject the second settle attempt.
func TestDuplicateSettleRejection(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// First, we'll add an HTLC from Alice to Bob, and lock it in for both
// parties.
htlcAmount := lnwire.NewMSatFromSatoshis(20000)
htlcAlice, alicePreimage := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
_, err = bobChannel.ReceiveHTLC(htlcAlice)
if err != nil {
t.Fatalf("unable to recv htlc: %v", err)
}
if err := ForceStateTransition(aliceChannel, bobChannel); err != nil {
t.Fatalf("unable to complete state update: %v", err)
}
// With the HTLC locked in, we'll now have Bob settle the HTLC back to
// Alice.
err = bobChannel.SettleHTLC(alicePreimage, uint64(0), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveHTLCSettle(alicePreimage, uint64(0))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// If we attempt to fail it AGAIN, then both sides should reject this
// second failure attempt.
err = bobChannel.SettleHTLC(alicePreimage, uint64(0), nil, nil, nil)
if err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
err = aliceChannel.ReceiveHTLCSettle(alicePreimage, uint64(0))
if err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
// We'll now have Bob sign a new commitment to lock in the HTLC fail
// for Alice.
_, _, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commit: %v", err)
}
// We'll now force a restart for Bob and Alice, so we can test the
// persistence related portion of this assertion.
bobChannel, err = restartChannel(bobChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
aliceChannel, err = restartChannel(aliceChannel)
if err != nil {
t.Fatalf("unable to restart channel: %v", err)
}
// If we try to fail the same HTLC again, then we should get an error.
err = bobChannel.SettleHTLC(alicePreimage, uint64(0), nil, nil, nil)
if err == nil {
t.Fatalf("duplicate HTLC failure attempt should have failed")
}
// Alice on the other hand should accept the failure again, as she
// dropped all items in the logs which weren't committed.
err = aliceChannel.ReceiveHTLCSettle(alicePreimage, uint64(0))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
}
// TestChannelRestoreCommitHeight tests that the local and remote commit
// heights of HTLCs are set correctly across restores.
func TestChannelRestoreCommitHeight(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// helper method to check add heights of the htlcs found in the given
// log after a restore.
restoreAndAssertCommitHeights := func(t *testing.T,
channel *LightningChannel, remoteLog bool, htlcIndex uint64,
expLocal, expRemote uint64) *LightningChannel {
newChannel, err := NewLightningChannel(
channel.Signer, channel.channelState, channel.sigPool,
)
if err != nil {
t.Fatalf("unable to create new channel: %v", err)
}
var pd *PaymentDescriptor
if remoteLog {
if newChannel.localUpdateLog.lookupHtlc(htlcIndex) != nil {
t.Fatalf("htlc found in wrong log")
}
pd = newChannel.remoteUpdateLog.lookupHtlc(htlcIndex)
} else {
if newChannel.remoteUpdateLog.lookupHtlc(htlcIndex) != nil {
t.Fatalf("htlc found in wrong log")
}
pd = newChannel.localUpdateLog.lookupHtlc(htlcIndex)
}
if pd == nil {
t.Fatalf("htlc not found in log")
}
if pd.addCommitHeightLocal != expLocal {
t.Fatalf("expected local add height to be %d, was %d",
expLocal, pd.addCommitHeightLocal)
}
if pd.addCommitHeightRemote != expRemote {
t.Fatalf("expected remote add height to be %d, was %d",
expRemote, pd.addCommitHeightRemote)
}
return newChannel
}
// We'll send an HtLC from Alice to Bob.
htlcAmount := lnwire.NewMSatFromSatoshis(100000000)
htlcAlice, _ := createHTLC(0, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// Let Alice sign a new state, which will include the HTLC just sent.
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// The HTLC should only be on the pending remote commitment, so the
// only the remote add height should be set during a restore.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 0, 1,
)
// Bob receives this commitment signature, and revokes his old state.
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
// Now the HTLC is locked into Bob's commitment, a restoration should
// set only the local commit height, as it is not locked into Alice's
// yet.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 1, 0)
// Alice receives the revocation, ACKing her pending commitment.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to recive revocation: %v", err)
}
// However, the HTLC is still not locked into her local commitment, so
// the local add height should still be 0 after a restoration.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 0, 1,
)
// Now let Bob send the commitment signature making the HTLC lock in on
// Alice's commitment.
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// At this stage Bob has a pending remote commitment. Make sure
// restoring at this stage correcly restores the HTLC add commit
// heights.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 1, 1)
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
// Now both the local and remote add heights should be properly set.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 1, 1,
)
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("unable to recive revocation: %v", err)
}
// Alice ACKing Bob's pending commitment shouldn't change the heights
// restored.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 1, 1)
// Send andother HTLC from Alice to Bob, to test whether already
// existing HTLCs (the HTLC with index 0) keep getting the add heights
// restored properly.
htlcAlice, _ = createHTLC(1, htlcAmount)
if _, err := aliceChannel.AddHTLC(htlcAlice, nil); err != nil {
t.Fatalf("alice unable to add htlc: %v", err)
}
if _, err := bobChannel.ReceiveHTLC(htlcAlice); err != nil {
t.Fatalf("bob unable to recv add htlc: %v", err)
}
// Send a new signature from Alice to Bob, making Alice have a pending
// remote commitment.
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// A restoration should keep the add heights iof the first HTLC, and
// the new HTLC should have a remote add height 2.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 1, 1,
)
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 1, 0, 2,
)
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
bobRevocation, _, err = bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
// Since Bob just revoked another commitment, a restoration should
// increase the add height of the firt HTLC to 2, as we only keep the
// last unrevoked commitment. The new HTLC will also have a local add
// height of 2.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 2, 1)
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 1, 2, 0)
// Alice receives the revocation, ACKing her pending commitment for Bob.
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
if err != nil {
t.Fatalf("unable to receive revocation: %v", err)
}
// Alice receiving Bob's revocation should bump both addCommitHeightRemote
// heights to 2.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 1, 2,
)
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 1, 0, 2,
)
// Sign a new state for Alice, making Bob have a pending remote
// commitment.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// The signing of a new commitment for Alice should have given the new
// HTLC an add height.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 2, 1)
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 1, 2, 2)
// Alice should receive the commitment and send over a revocation.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
aliceRevocation, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
// Both heights should be 2 and they are on both commitments.
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 2, 2,
)
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 1, 2, 2,
)
// Bob receives the revocation, which should set both addCommitHeightRemote
// fields to 2.
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
if err != nil {
t.Fatalf("unable to receive revocation: %v", err)
}
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 2, 2)
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 1, 2, 2)
// Bob now fails back the htlc that was just locked in.
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
if err != nil {
t.Fatalf("unable to cancel HTLC: %v", err)
}
err = aliceChannel.ReceiveFailHTLC(0, []byte("bad"))
if err != nil {
t.Fatalf("unable to recv htlc cancel: %v", err)
}
// Now Bob signs for the fail update.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commitment: %v", err)
}
// Bob has a pending commitment for Alice, it shouldn't affect the add
// commit heights though.
bobChannel = restoreAndAssertCommitHeights(t, bobChannel, true, 0, 2, 2)
_ = restoreAndAssertCommitHeights(t, bobChannel, true, 1, 2, 2)
// Alice receives commitment, sends revocation.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
_, _, err = aliceChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke commitment: %v", err)
}
aliceChannel = restoreAndAssertCommitHeights(
t, aliceChannel, false, 0, 3, 2,
)
_ = restoreAndAssertCommitHeights(t, aliceChannel, false, 1, 3, 2)
}
// TestForceCloseFailLocalDataLoss tests that we don't allow a force close of a
// channel that's in a non-default state.
func TestForceCloseFailLocalDataLoss(t *testing.T) {
t.Parallel()
aliceChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Now that we have our set of channels, we'll modify the channel state
// to have a non-default channel flag.
err = aliceChannel.channelState.ApplyChanStatus(
channeldb.ChanStatusLocalDataLoss,
)
if err != nil {
t.Fatalf("unable to apply channel state: %v", err)
}
// Due to the change above, if we attempt to force close this
// channel, we should fail as it isn't safe to force close a
// channel that isn't in the pure default state.
_, err = aliceChannel.ForceClose()
if err == nil {
t.Fatalf("expected force close to fail due to non-default " +
"chan state")
}
}
// TestForceCloseBorkedState tests that once we force close a channel, it's
// marked as borked in the database. Additionally, all calls to mutate channel
// state should also fail.
func TestForceCloseBorkedState(t *testing.T) {
t.Parallel()
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Do the commitment dance until Bob sends a revocation so Alice is
// able to receive the revocation, and then also make a new state
// herself.
aliceSigs, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commit: %v", err)
}
err = bobChannel.ReceiveNewCommitment(aliceSigs, aliceHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
revokeMsg, _, err := bobChannel.RevokeCurrentCommitment()
if err != nil {
t.Fatalf("unable to revoke bob commitment: %v", err)
}
bobSigs, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
if err != nil {
t.Fatalf("unable to sign commit: %v", err)
}
err = aliceChannel.ReceiveNewCommitment(bobSigs, bobHtlcSigs)
if err != nil {
t.Fatalf("unable to receive commitment: %v", err)
}
// Now that we have a new Alice channel, we'll force close once to
// trigger the update on disk to mark the channel as borked.
if _, err := aliceChannel.ForceClose(); err != nil {
t.Fatalf("unable to force close channel: %v", err)
}
// Next we'll mark the channel as borked before we proceed.
err = aliceChannel.channelState.ApplyChanStatus(
channeldb.ChanStatusBorked,
)
if err != nil {
t.Fatalf("unable to apply chan status: %v", err)
}
// The on-disk state should indicate that the channel is now borked.
if !aliceChannel.channelState.HasChanStatus(
channeldb.ChanStatusBorked,
) {
t.Fatalf("chan status not updated as borked")
}
// At this point, all channel mutating methods should now fail as they
// shouldn't be able to proceed if the channel is borked.
_, _, _, _, err = aliceChannel.ReceiveRevocation(revokeMsg)
if err != channeldb.ErrChanBorked {
t.Fatalf("advance commitment tail should have failed")
}
// We manually advance the commitment tail here since the above
// ReceiveRevocation call will fail before it's actually advanced.
aliceChannel.remoteCommitChain.advanceTail()
_, _, _, err = aliceChannel.SignNextCommitment()
if err != channeldb.ErrChanBorked {
t.Fatalf("sign commitment should have failed: %v", err)
}
_, _, err = aliceChannel.RevokeCurrentCommitment()
if err != channeldb.ErrChanBorked {
t.Fatalf("append remove chain tail should have failed")
}
}
// TestChannelMaxFeeRate ensures we correctly compute a channel initiator's max
// fee rate based on an allocation and its available balance. It should never
// dip below the established fee floor.
func TestChannelMaxFeeRate(t *testing.T) {
t.Parallel()
assertMaxFeeRate := func(c *LightningChannel,
maxAlloc float64, anchorMax, expFeeRate chainfee.SatPerKWeight) {
t.Helper()
maxFeeRate := c.MaxFeeRate(maxAlloc, anchorMax)
if maxFeeRate != expFeeRate {
t.Fatalf("expected max fee rate of %v with max "+
"allocation of %v, got %v", expFeeRate,
maxAlloc, maxFeeRate)
}
}
aliceChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
assertMaxFeeRate(aliceChannel, 1.0, 0, 690607734)
assertMaxFeeRate(aliceChannel, 0.001, 0, 690607)
assertMaxFeeRate(aliceChannel, 0.000001, 0, 690)
assertMaxFeeRate(aliceChannel, 0.0000001, 0, chainfee.FeePerKwFloor)
// Check that anchor channels are capped at their max fee rate.
anchorChannel, _, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit | channeldb.AnchorOutputsBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Anchor commitments are heavier, hence will the same allocation lead
// to slightly lower fee rates.
assertMaxFeeRate(
anchorChannel, 1.0, chainfee.FeePerKwFloor,
chainfee.FeePerKwFloor,
)
assertMaxFeeRate(anchorChannel, 0.001, 1000000, 444839)
assertMaxFeeRate(anchorChannel, 0.001, 300000, 300000)
assertMaxFeeRate(anchorChannel, 0.000001, 700, 444)
assertMaxFeeRate(
anchorChannel, 0.0000001, 1000000, chainfee.FeePerKwFloor,
)
}
// TestChannelFeeRateFloor asserts that valid commitments can be proposed and
// received using chainfee.FeePerKwFloor as the initiator's fee rate.
func TestChannelFeeRateFloor(t *testing.T) {
t.Parallel()
alice, bob, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
if err != nil {
t.Fatalf("unable to create test channels: %v", err)
}
defer cleanUp()
// Set the fee rate to the proposing fee rate floor.
minFee := chainfee.FeePerKwFloor
// Alice is the initiator, so only she can propose fee updates.
if err := alice.UpdateFee(minFee); err != nil {
t.Fatalf("unable to send fee update")
}
if err := bob.ReceiveUpdateFee(minFee); err != nil {
t.Fatalf("unable to receive fee update")
}
// Check that alice can still sign commitments.
sig, htlcSigs, _, err := alice.SignNextCommitment()
if err != nil {
t.Fatalf("alice unable to sign commitment: %v", err)
}
// Check that bob can still receive commitments.
err = bob.ReceiveNewCommitment(sig, htlcSigs)
if err != nil {
t.Fatalf("bob unable to process alice's new commitment: %v",
err)
}
}
// TestFetchParent tests lookup of an entry's parent in the appropriate log.
func TestFetchParent(t *testing.T) {
tests := []struct {
name string
remoteChain bool
remoteLog bool
localEntries []*PaymentDescriptor
remoteEntries []*PaymentDescriptor
// parentIndex is the parent index of the entry that we will
// lookup with fetch parent.
parentIndex uint64
// expectErr indicates that we expect fetch parent to fail.
expectErr bool
// expectedIndex is the htlc index that we expect the parent
// to have.
expectedIndex uint64
}{
{
name: "not found in remote log",
localEntries: nil,
remoteEntries: nil,
remoteChain: true,
remoteLog: true,
parentIndex: 0,
expectErr: true,
},
{
name: "not found in local log",
localEntries: nil,
remoteEntries: nil,
remoteChain: false,
remoteLog: false,
parentIndex: 0,
expectErr: true,
},
{
name: "remote log + chain, remote add height 0",
localEntries: nil,
remoteEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 100,
addCommitHeightRemote: 0,
},
},
remoteChain: true,
remoteLog: true,
parentIndex: 1,
expectErr: true,
},
{
name: "remote log, local chain, local add height 0",
remoteEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 0,
addCommitHeightRemote: 100,
},
},
localEntries: nil,
remoteChain: false,
remoteLog: true,
parentIndex: 1,
expectErr: true,
},
{
name: "local log + chain, local add height 0",
localEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 0,
addCommitHeightRemote: 100,
},
},
remoteEntries: nil,
remoteChain: false,
remoteLog: false,
parentIndex: 1,
expectErr: true,
},
{
name: "local log + remote chain, remote add height 0",
localEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 100,
addCommitHeightRemote: 0,
},
},
remoteEntries: nil,
remoteChain: true,
remoteLog: false,
parentIndex: 1,
expectErr: true,
},
{
name: "remote log found",
localEntries: nil,
remoteEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 100,
addCommitHeightRemote: 0,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
},
remoteChain: true,
remoteLog: true,
parentIndex: 1,
expectErr: false,
expectedIndex: 2,
},
{
name: "local log found",
localEntries: []*PaymentDescriptor{
// This entry will be added at log index =0.
{
HtlcIndex: 1,
addCommitHeightLocal: 0,
addCommitHeightRemote: 100,
},
// This entry will be added at log index =1, it
// is the parent entry we are looking for.
{
HtlcIndex: 2,
addCommitHeightLocal: 100,
addCommitHeightRemote: 100,
},
},
remoteEntries: nil,
remoteChain: false,
remoteLog: false,
parentIndex: 1,
expectErr: false,
expectedIndex: 2,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
// Create a lightning channel with newly initialized
// local and remote logs.
lc := LightningChannel{
localUpdateLog: newUpdateLog(0, 0),
remoteUpdateLog: newUpdateLog(0, 0),
}
// Add the local and remote entries to update logs.
for _, entry := range test.localEntries {
lc.localUpdateLog.appendHtlc(entry)
}
for _, entry := range test.remoteEntries {
lc.remoteUpdateLog.appendHtlc(entry)
}
parent, err := lc.fetchParent(
&PaymentDescriptor{
ParentIndex: test.parentIndex,
},
test.remoteChain,
test.remoteLog,
)
gotErr := err != nil
if test.expectErr != gotErr {
t.Fatalf("expected error: %v, got: %v, "+
"error:%v", test.expectErr, gotErr, err)
}
// If our lookup failed, we do not need to check parent
// index.
if err != nil {
return
}
if parent.HtlcIndex != test.expectedIndex {
t.Fatalf("expected parent index: %v, got: %v",
test.parentIndex, parent.HtlcIndex)
}
})
}
}
// TestEvaluateView tests the creation of a htlc view and the opt in mutation of
// send and receive balances. This test does not check htlc mutation on a htlc
// level.
func TestEvaluateView(t *testing.T) {
const (
// addHeight is a non-zero height that is used for htlc adds.
addHeight = 200
// nextHeight is a constant that we use for the next height in
// all unit tests.
nextHeight = 400
// feePerKw is the fee we start all of our unit tests with.
feePerKw = 1
// htlcAddAmount is the amount for htlc adds in tests.
htlcAddAmount = 15
// ourFeeUpdateAmt is an amount that we update fees to
// expressed in msat.
ourFeeUpdateAmt = 20000
// ourFeeUpdatePerSat is the fee rate *in satoshis* that we
// expect if we update to ourFeeUpdateAmt.
ourFeeUpdatePerSat = chainfee.SatPerKWeight(20)
// theirFeeUpdateAmt iis an amount that they update fees to
// expressed in msat.
theirFeeUpdateAmt = 10000
// theirFeeUpdatePerSat is the fee rate *in satoshis* that we
// expect if we update to ourFeeUpdateAmt.
theirFeeUpdatePerSat = chainfee.SatPerKWeight(10)
)
tests := []struct {
name string
ourHtlcs []*PaymentDescriptor
theirHtlcs []*PaymentDescriptor
remoteChain bool
mutateState bool
// ourExpectedHtlcs is the set of our htlcs that we expect in
// the htlc view once it has been evaluated. We just store
// htlc index -> bool for brevity, because we only check the
// presence of the htlc in the returned set.
ourExpectedHtlcs map[uint64]bool
// theirExpectedHtlcs is the set of their htlcs that we expect
// in the htlc view once it has been evaluated. We just store
// htlc index -> bool for brevity, because we only check the
// presence of the htlc in the returned set.
theirExpectedHtlcs map[uint64]bool
// expectedFee is the fee we expect to be set after evaluating
// the htlc view.
expectedFee chainfee.SatPerKWeight
// expectReceived is the amount we expect the channel to have
// tracked as our receive total.
expectReceived lnwire.MilliSatoshi
// expectSent is the amount we expect the channel to have
// tracked as our send total.
expectSent lnwire.MilliSatoshi
}{
{
name: "our fee update is applied",
remoteChain: false,
mutateState: false,
ourHtlcs: []*PaymentDescriptor{
{
Amount: ourFeeUpdateAmt,
EntryType: FeeUpdate,
},
},
theirHtlcs: nil,
expectedFee: ourFeeUpdatePerSat,
ourExpectedHtlcs: nil,
theirExpectedHtlcs: nil,
expectReceived: 0,
expectSent: 0,
},
{
name: "their fee update is applied",
remoteChain: false,
mutateState: false,
ourHtlcs: []*PaymentDescriptor{},
theirHtlcs: []*PaymentDescriptor{
{
Amount: theirFeeUpdateAmt,
EntryType: FeeUpdate,
},
},
expectedFee: theirFeeUpdatePerSat,
ourExpectedHtlcs: nil,
theirExpectedHtlcs: nil,
expectReceived: 0,
expectSent: 0,
},
{
// We expect unresolved htlcs to to remain in the view.
name: "htlcs adds without settles",
remoteChain: false,
mutateState: false,
ourHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
},
theirHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Add,
},
},
expectedFee: feePerKw,
ourExpectedHtlcs: map[uint64]bool{
0: true,
},
theirExpectedHtlcs: map[uint64]bool{
0: true,
1: true,
},
expectReceived: 0,
expectSent: 0,
},
{
name: "our htlc settled, state mutated",
remoteChain: false,
mutateState: true,
ourHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
addCommitHeightLocal: addHeight,
},
},
theirHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Settle,
// Map their htlc settle update to our
// htlc add (0).
ParentIndex: 0,
},
},
expectedFee: feePerKw,
ourExpectedHtlcs: nil,
theirExpectedHtlcs: map[uint64]bool{
0: true,
},
expectReceived: 0,
expectSent: htlcAddAmount,
},
{
name: "our htlc settled, state not mutated",
remoteChain: false,
mutateState: false,
ourHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
addCommitHeightLocal: addHeight,
},
},
theirHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Settle,
// Map their htlc settle update to our
// htlc add (0).
ParentIndex: 0,
},
},
expectedFee: feePerKw,
ourExpectedHtlcs: nil,
theirExpectedHtlcs: map[uint64]bool{
0: true,
},
expectReceived: 0,
expectSent: 0,
},
{
name: "their htlc settled, state mutated",
remoteChain: false,
mutateState: true,
ourHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Settle,
// Map our htlc settle update to their
// htlc add (1).
ParentIndex: 1,
},
},
theirHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
addCommitHeightLocal: addHeight,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Add,
addCommitHeightLocal: addHeight,
},
},
expectedFee: feePerKw,
ourExpectedHtlcs: map[uint64]bool{
0: true,
},
theirExpectedHtlcs: map[uint64]bool{
0: true,
},
expectReceived: htlcAddAmount,
expectSent: 0,
},
{
name: "their htlc settled, state not mutated",
remoteChain: false,
mutateState: false,
ourHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
},
{
HtlcIndex: 1,
Amount: htlcAddAmount,
EntryType: Settle,
// Map our htlc settle update to their
// htlc add (0).
ParentIndex: 0,
},
},
theirHtlcs: []*PaymentDescriptor{
{
HtlcIndex: 0,
Amount: htlcAddAmount,
EntryType: Add,
addCommitHeightLocal: addHeight,
},
},
expectedFee: feePerKw,
ourExpectedHtlcs: map[uint64]bool{
0: true,
},
theirExpectedHtlcs: nil,
expectReceived: 0,
expectSent: 0,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
lc := LightningChannel{
channelState: &channeldb.OpenChannel{
TotalMSatSent: 0,
TotalMSatReceived: 0,
},
// Create update logs for local and remote.
localUpdateLog: newUpdateLog(0, 0),
remoteUpdateLog: newUpdateLog(0, 0),
}
for _, htlc := range test.ourHtlcs {
if htlc.EntryType == Add {
lc.localUpdateLog.appendHtlc(htlc)
} else {
lc.localUpdateLog.appendUpdate(htlc)
}
}
for _, htlc := range test.theirHtlcs {
if htlc.EntryType == Add {
lc.remoteUpdateLog.appendHtlc(htlc)
} else {
lc.remoteUpdateLog.appendUpdate(htlc)
}
}
view := &htlcView{
ourUpdates: test.ourHtlcs,
theirUpdates: test.theirHtlcs,
feePerKw: feePerKw,
}
var (
// Create vars to store balance changes. We do
// not check these values in this test because
// balance modification happens on the htlc
// processing level.
ourBalance lnwire.MilliSatoshi
theirBalance lnwire.MilliSatoshi
)
// Evaluate the htlc view, mutate as test expects.
result, err := lc.evaluateHTLCView(
view, &ourBalance, &theirBalance, nextHeight,
test.remoteChain, test.mutateState,
)
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if result.feePerKw != test.expectedFee {
t.Fatalf("expected fee: %v, got: %v",
test.expectedFee, result.feePerKw)
}
checkExpectedHtlcs(
t, result.ourUpdates, test.ourExpectedHtlcs,
)
checkExpectedHtlcs(
t, result.theirUpdates, test.theirExpectedHtlcs,
)
if lc.channelState.TotalMSatSent != test.expectSent {
t.Fatalf("expected sent: %v, got: %v",
test.expectSent,
lc.channelState.TotalMSatSent)
}
if lc.channelState.TotalMSatReceived !=
test.expectReceived {
t.Fatalf("expected received: %v, got: %v",
test.expectReceived,
lc.channelState.TotalMSatReceived)
}
})
}
}
// checkExpectedHtlcs checks that a set of htlcs that we have contains all the
// htlcs we expect.
func checkExpectedHtlcs(t *testing.T, actual []*PaymentDescriptor,
expected map[uint64]bool) {
if len(expected) != len(actual) {
t.Fatalf("expected: %v htlcs, got: %v",
len(expected), len(actual))
}
for _, htlc := range actual {
_, ok := expected[htlc.HtlcIndex]
if !ok {
t.Fatalf("htlc with index: %v not "+
"expected in set", htlc.HtlcIndex)
}
}
}
// heights represents the heights on a payment descriptor.
type heights struct {
localAdd uint64
localRemove uint64
remoteAdd uint64
remoteRemove uint64
}
// TestProcessFeeUpdate tests the applying of fee updates and mutation of
// local and remote add and remove heights on update messages.
func TestProcessFeeUpdate(t *testing.T) {
const (
// height is a non-zero height that can be used for htlcs
// heights.
height = 200
// nextHeight is a constant that we use for the next height in
// all unit tests.
nextHeight = 400
// feePerKw is the fee we start all of our unit tests with.
feePerKw = 1
// ourFeeUpdateAmt is an amount that we update fees to expressed
// in msat.
ourFeeUpdateAmt = 20000
// ourFeeUpdatePerSat is the fee rate *in satoshis* that we
// expect if we update to ourFeeUpdateAmt.
ourFeeUpdatePerSat = chainfee.SatPerKWeight(20)
)
tests := []struct {
name string
startHeights heights
expectedHeights heights
remoteChain bool
mutate bool
expectedFee chainfee.SatPerKWeight
}{
{
// Looking at local chain, local add is non-zero so
// the update has been applied already; no fee change.
name: "non-zero local height, fee unchanged",
startHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: height,
},
expectedHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: height,
},
remoteChain: false,
mutate: false,
expectedFee: feePerKw,
},
{
// Looking at local chain, local add is zero so the
// update has not been applied yet; we expect a fee
// update.
name: "zero local height, fee changed",
startHeights: heights{
localAdd: 0,
localRemove: 0,
remoteAdd: height,
remoteRemove: 0,
},
expectedHeights: heights{
localAdd: 0,
localRemove: 0,
remoteAdd: height,
remoteRemove: 0,
},
remoteChain: false,
mutate: false,
expectedFee: ourFeeUpdatePerSat,
},
{
// Looking at remote chain, the remote add height is
// zero, so the update has not been applied so we expect
// a fee change.
name: "zero remote height, fee changed",
startHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: 0,
},
expectedHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: 0,
},
remoteChain: true,
mutate: false,
expectedFee: ourFeeUpdatePerSat,
},
{
// Looking at remote chain, the remote add height is
// non-zero, so the update has been applied so we expect
// no fee change.
name: "non-zero remote height, no fee change",
startHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: height,
remoteRemove: 0,
},
expectedHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: height,
remoteRemove: 0,
},
remoteChain: true,
mutate: false,
expectedFee: feePerKw,
},
{
// Local add height is non-zero, so the update has
// already been applied; we do not expect fee to
// change or any mutations to be applied.
name: "non-zero local height, mutation not applied",
startHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: height,
},
expectedHeights: heights{
localAdd: height,
localRemove: 0,
remoteAdd: 0,
remoteRemove: height,
},
remoteChain: false,
mutate: true,
expectedFee: feePerKw,
},
{
// Local add is zero and we are looking at our local
// chain, so the update has not been applied yet. We
// expect the local add and remote heights to be
// mutated.
name: "zero height, fee changed, mutation applied",
startHeights: heights{
localAdd: 0,
localRemove: 0,
remoteAdd: 0,
remoteRemove: 0,
},
expectedHeights: heights{
localAdd: nextHeight,
localRemove: nextHeight,
remoteAdd: 0,
remoteRemove: 0,
},
remoteChain: false,
mutate: true,
expectedFee: ourFeeUpdatePerSat,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
// Create a fee update with add and remove heights as
// set in the test.
heights := test.startHeights
update := &PaymentDescriptor{
Amount: ourFeeUpdateAmt,
addCommitHeightRemote: heights.remoteAdd,
addCommitHeightLocal: heights.localAdd,
removeCommitHeightRemote: heights.remoteRemove,
removeCommitHeightLocal: heights.localRemove,
EntryType: FeeUpdate,
}
view := &htlcView{
feePerKw: chainfee.SatPerKWeight(feePerKw),
}
processFeeUpdate(
update, nextHeight, test.remoteChain,
test.mutate, view,
)
if view.feePerKw != test.expectedFee {
t.Fatalf("expected fee: %v, got: %v",
test.expectedFee, feePerKw)
}
checkHeights(t, update, test.expectedHeights)
})
}
}
func checkHeights(t *testing.T, update *PaymentDescriptor, expected heights) {
updateHeights := heights{
localAdd: update.addCommitHeightLocal,
localRemove: update.removeCommitHeightLocal,
remoteAdd: update.addCommitHeightRemote,
remoteRemove: update.removeCommitHeightRemote,
}
if !reflect.DeepEqual(updateHeights, expected) {
t.Fatalf("expected: %v, got: %v", expected, updateHeights)
}
}
// TestProcessAddRemoveEntry tests the updating of our and their balances when
// we process adds, settles and fails. It also tests the mutating of add and
// remove heights.
func TestProcessAddRemoveEntry(t *testing.T) {
const (
// addHeight is a non-zero addHeight that is used for htlc
// add heights.
addHeight = 100
// removeHeight is a non-zero removeHeight that is used for
// htlc remove heights.
removeHeight = 200
// nextHeight is a constant that we use for the nextHeight in
// all unit tests.
nextHeight = 400
// updateAmount is the amount that the update is set to.
updateAmount = lnwire.MilliSatoshi(10)
// startBalance is a balance we start both sides out with
// so that balances can be incremented.
startBalance = lnwire.MilliSatoshi(100)
)
tests := []struct {
name string
startHeights heights
remoteChain bool
isIncoming bool
mutateState bool
ourExpectedBalance lnwire.MilliSatoshi
theirExpectedBalance lnwire.MilliSatoshi
expectedHeights heights
updateType updateType
}{
{
name: "add, remote chain, already processed",
startHeights: heights{
localAdd: 0,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: 0,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "add, local chain, already processed",
startHeights: heights{
localAdd: addHeight,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: false,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "incoming add, local chain, not mutated",
startHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: false,
isIncoming: true,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance - updateAmount,
expectedHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "incoming add, local chain, mutated",
startHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: false,
isIncoming: true,
mutateState: true,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance - updateAmount,
expectedHeights: heights{
localAdd: nextHeight,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "outgoing add, remote chain, not mutated",
startHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance - updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "outgoing add, remote chain, mutated",
startHeights: heights{
localAdd: 0,
remoteAdd: 0,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: false,
mutateState: true,
ourExpectedBalance: startBalance - updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: 0,
remoteAdd: nextHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Add,
},
{
name: "settle, remote chain, already processed",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: removeHeight,
},
remoteChain: true,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: removeHeight,
},
updateType: Settle,
},
{
name: "settle, local chain, already processed",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: removeHeight,
remoteRemove: 0,
},
remoteChain: false,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: removeHeight,
remoteRemove: 0,
},
updateType: Settle,
},
{
// Remote chain, and not processed yet. Incoming settle,
// so we expect our balance to increase.
name: "incoming settle",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: true,
mutateState: false,
ourExpectedBalance: startBalance + updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Settle,
},
{
// Remote chain, and not processed yet. Incoming settle,
// so we expect our balance to increase.
name: "outgoing settle",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance + updateAmount,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Settle,
},
{
// Remote chain, and not processed yet. Incoming fail,
// so we expect their balance to increase.
name: "incoming fail",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: true,
mutateState: false,
ourExpectedBalance: startBalance,
theirExpectedBalance: startBalance + updateAmount,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Fail,
},
{
// Remote chain, and not processed yet. Outgoing fail,
// so we expect our balance to increase.
name: "outgoing fail",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: false,
mutateState: false,
ourExpectedBalance: startBalance + updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
updateType: Fail,
},
{
// Local chain, and not processed yet. Incoming settle,
// so we expect our balance to increase. Mutate is
// true, so we expect our remove removeHeight to have
// changed.
name: "fail, our remove height mutated",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: false,
isIncoming: true,
mutateState: true,
ourExpectedBalance: startBalance + updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: nextHeight,
remoteRemove: 0,
},
updateType: Settle,
},
{
// Remote chain, and not processed yet. Incoming settle,
// so we expect our balance to increase. Mutate is
// true, so we expect their remove removeHeight to have
// changed.
name: "fail, their remove height mutated",
startHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: 0,
},
remoteChain: true,
isIncoming: true,
mutateState: true,
ourExpectedBalance: startBalance + updateAmount,
theirExpectedBalance: startBalance,
expectedHeights: heights{
localAdd: addHeight,
remoteAdd: addHeight,
localRemove: 0,
remoteRemove: nextHeight,
},
updateType: Settle,
},
}
for _, test := range tests {
test := test
t.Run(test.name, func(t *testing.T) {
t.Parallel()
heights := test.startHeights
update := &PaymentDescriptor{
Amount: updateAmount,
addCommitHeightLocal: heights.localAdd,
addCommitHeightRemote: heights.remoteAdd,
removeCommitHeightLocal: heights.localRemove,
removeCommitHeightRemote: heights.remoteRemove,
EntryType: test.updateType,
}
var (
// Start both parties off with an initial
// balance. Copy by value here so that we do
// not mutate the startBalance constant.
ourBalance, theirBalance = startBalance,
startBalance
)
// Choose the processing function we need based on the
// update type. Process remove is used for settles,
// fails and malformed htlcs.
process := processRemoveEntry
if test.updateType == Add {
process = processAddEntry
}
process(
update, &ourBalance, &theirBalance, nextHeight,
test.remoteChain, test.isIncoming,
test.mutateState,
)
// Check that balances were updated as expected.
if ourBalance != test.ourExpectedBalance {
t.Fatalf("expected our balance: %v, got: %v",
test.ourExpectedBalance, ourBalance)
}
if theirBalance != test.theirExpectedBalance {
t.Fatalf("expected their balance: %v, got: %v",
test.theirExpectedBalance, theirBalance)
}
// Check that heights on the update are as expected.
checkHeights(t, update, test.expectedHeights)
})
}
}
// TestChannelUnsignedAckedFailure tests that unsigned acked updates are
// properly restored after signing for them and disconnecting.
//
// The full state transition of this test is:
//
// Alice Bob
// -----add----->
// -----sig----->
// <----rev------
// <----sig------
// -----rev----->
// <----fail-----
// <----sig------
// -----rev----->
// -----sig-----X (does not reach Bob! Alice dies!)
//
// -----sig----->
// <----rev------
// <----add------
// <----sig------
//
// The last sig was rejected with the old behavior of deleting unsigned
// acked updates from the database after signing for them. The current
// behavior of filtering them for deletion upon receiving a revocation
// causes Alice to accept the signature as valid.
func TestChannelUnsignedAckedFailure(t *testing.T) {
t.Parallel()
// Create a test channel so that we can test the buggy behavior.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
require.NoError(t, err)
defer cleanUp()
// First we create an HTLC that Alice sends to Bob.
htlc, _ := createHTLC(0, lnwire.MilliSatoshi(500000))
// -----add----->
_, err = aliceChannel.AddHTLC(htlc, nil)
require.NoError(t, err)
_, err = bobChannel.ReceiveHTLC(htlc)
require.NoError(t, err)
// Force a state transition to lock in this add on both commitments.
// -----sig----->
// <----rev------
// <----sig------
// -----rev----->
err = ForceStateTransition(aliceChannel, bobChannel)
require.NoError(t, err)
// Now Bob should fail the htlc back to Alice.
// <----fail-----
err = bobChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
require.NoError(t, err)
err = aliceChannel.ReceiveFailHTLC(0, []byte("bad"))
require.NoError(t, err)
// Bob should send a commitment signature to Alice.
// <----sig------
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
require.NoError(t, err)
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
// Alice should reply with a revocation.
// -----rev----->
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = bobChannel.ReceiveRevocation(aliceRevocation)
require.NoError(t, err)
// Alice should sign the next commitment and go down before
// sending it.
// -----sig-----X
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
require.NoError(t, err)
newAliceChannel, err := NewLightningChannel(
aliceChannel.Signer, aliceChannel.channelState,
aliceChannel.sigPool,
)
require.NoError(t, err)
// Bob receives Alice's signature.
// -----sig----->
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
require.NoError(t, err)
// Bob revokes his current commitment and sends a revocation
// to Alice.
// <----rev------
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = newAliceChannel.ReceiveRevocation(bobRevocation)
require.NoError(t, err)
// Now Bob sends an HTLC to Alice.
htlc2, _ := createHTLC(0, lnwire.MilliSatoshi(500000))
// <----add------
_, err = bobChannel.AddHTLC(htlc2, nil)
require.NoError(t, err)
_, err = newAliceChannel.ReceiveHTLC(htlc2)
require.NoError(t, err)
// Bob sends the final signature to Alice and Alice should not
// reject it, given that we properly restore the unsigned acked
// updates and therefore our update log is structured correctly.
bobSig, bobHtlcSigs, _, err = bobChannel.SignNextCommitment()
require.NoError(t, err)
err = newAliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
}
// TestChannelLocalUnsignedUpdatesFailure checks that updates from the local
// log are restored if the remote hasn't sent us a signature covering them.
//
// The full state transition is:
//
// Alice Bob
// <----add-----
// <----sig-----
// -----rev---->
// -----sig---->
// <----rev-----
// ----fail---->
// -----sig---->
// <----rev-----
// *reconnect*
// <----sig-----
//
// Alice should reject the last signature since the settle is not restored
// into the local update log and thus calculates Bob's signature as invalid.
func TestChannelLocalUnsignedUpdatesFailure(t *testing.T) {
t.Parallel()
// Create a test channel so that we can test the buggy behavior.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
require.NoError(t, err)
defer cleanUp()
// First we create an htlc that Bob sends to Alice.
htlc, _ := createHTLC(0, lnwire.MilliSatoshi(500000))
// <----add-----
_, err = bobChannel.AddHTLC(htlc, nil)
require.NoError(t, err)
_, err = aliceChannel.ReceiveHTLC(htlc)
require.NoError(t, err)
// Force a state transition to lock in this add on both commitments.
// <----sig-----
// -----rev---->
// -----sig---->
// <----rev-----
err = ForceStateTransition(bobChannel, aliceChannel)
require.NoError(t, err)
// Now Alice should fail the htlc back to Bob.
// -----fail--->
err = aliceChannel.FailHTLC(0, []byte("failreason"), nil, nil, nil)
require.NoError(t, err)
err = bobChannel.ReceiveFailHTLC(0, []byte("bad"))
require.NoError(t, err)
// Alice should send a commitment signature to Bob.
// -----sig---->
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
require.NoError(t, err)
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
require.NoError(t, err)
// Bob should reply with a revocation and Alice should save the fail as
// an unsigned local update.
// <----rev-----
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
require.NoError(t, err)
// Restart Alice and assert that she can receive Bob's next commitment
// signature.
// *reconnect*
newAliceChannel, err := NewLightningChannel(
aliceChannel.Signer, aliceChannel.channelState,
aliceChannel.sigPool,
)
require.NoError(t, err)
// Bob sends the final signature and Alice should not reject it.
// <----sig-----
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
require.NoError(t, err)
err = newAliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
}
// TestChannelSignedAckRegression tests a previously-regressing state
// transition no longer causes channel desynchronization.
//
// The full state transition of this test is:
//
// Alice Bob
// <----add-------
// <----sig-------
// -----rev------>
// -----sig------>
// <----rev-------
// ----settle---->
// -----sig------>
// <----rev-------
// <----sig-------
// -----add------>
// -----sig------>
// <----rev-------
// *restarts*
// -----rev------>
// <----sig-------
//
func TestChannelSignedAckRegression(t *testing.T) {
t.Parallel()
// Create test channels to test out this state transition.
aliceChannel, bobChannel, cleanUp, err := CreateTestChannels(
channeldb.SingleFunderTweaklessBit,
)
require.NoError(t, err)
defer cleanUp()
// Create an HTLC that Bob will send to Alice.
htlc, preimage := createHTLC(0, lnwire.MilliSatoshi(5000000))
// <----add------
_, err = bobChannel.AddHTLC(htlc, nil)
require.NoError(t, err)
_, err = aliceChannel.ReceiveHTLC(htlc)
require.NoError(t, err)
// Force a state transition to lock in the HTLC.
// <----sig------
// -----rev----->
// -----sig----->
// <----rev------
err = ForceStateTransition(bobChannel, aliceChannel)
require.NoError(t, err)
// Alice settles the HTLC back to Bob.
// ----settle--->
err = aliceChannel.SettleHTLC(preimage, uint64(0), nil, nil, nil)
require.NoError(t, err)
err = bobChannel.ReceiveHTLCSettle(preimage, uint64(0))
require.NoError(t, err)
// -----sig---->
aliceSig, aliceHtlcSigs, _, err := aliceChannel.SignNextCommitment()
require.NoError(t, err)
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
require.NoError(t, err)
// <----rev-----
bobRevocation, _, err := bobChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
require.NoError(t, err)
// <----sig-----
bobSig, bobHtlcSigs, _, err := bobChannel.SignNextCommitment()
require.NoError(t, err)
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
// Create an HTLC that Alice will send to Bob.
htlc2, _ := createHTLC(0, lnwire.MilliSatoshi(5000000))
// -----add---->
_, err = aliceChannel.AddHTLC(htlc2, nil)
require.NoError(t, err)
_, err = bobChannel.ReceiveHTLC(htlc2)
require.NoError(t, err)
// -----sig---->
aliceSig, aliceHtlcSigs, _, err = aliceChannel.SignNextCommitment()
require.NoError(t, err)
err = bobChannel.ReceiveNewCommitment(aliceSig, aliceHtlcSigs)
require.NoError(t, err)
// <----rev-----
bobRevocation, _, err = bobChannel.RevokeCurrentCommitment()
require.NoError(t, err)
_, _, _, _, err = aliceChannel.ReceiveRevocation(bobRevocation)
require.NoError(t, err)
// Restart Bob's channel state here.
newBobChannel, err := NewLightningChannel(
bobChannel.Signer, bobChannel.channelState,
bobChannel.sigPool,
)
require.NoError(t, err)
// -----rev---->
aliceRevocation, _, err := aliceChannel.RevokeCurrentCommitment()
require.NoError(t, err)
fwdPkg, _, _, _, err := newBobChannel.ReceiveRevocation(aliceRevocation)
require.NoError(t, err)
// Assert that the fwdpkg is not empty.
require.Equal(t, len(fwdPkg.SettleFails), 1)
// Bob should no longer fail to sign this commitment due to faulty
// update logs.
// <----sig-----
bobSig, bobHtlcSigs, _, err = newBobChannel.SignNextCommitment()
require.NoError(t, err)
// Alice should receive the new commitment without hiccups.
err = aliceChannel.ReceiveNewCommitment(bobSig, bobHtlcSigs)
require.NoError(t, err)
}
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