lnd.xprv/htlcswitch/link_isolated_test.go

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package htlcswitch
import (
"crypto/sha256"
"testing"
"time"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwallet"
"github.com/lightningnetwork/lnd/lnwire"
)
type linkTestContext struct {
t *testing.T
aliceLink ChannelLink
bobChannel *lnwallet.LightningChannel
aliceMsgs <-chan lnwire.Message
}
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// sendHtlcBobToAlice sends an HTLC from Bob to Alice, that pays to a preimage
// already in Alice's registry.
func (l *linkTestContext) sendHtlcBobToAlice(htlc *lnwire.UpdateAddHTLC) {
l.t.Helper()
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_, err := l.bobChannel.AddHTLC(htlc, nil)
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if err != nil {
l.t.Fatalf("bob failed adding htlc: %v", err)
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}
l.aliceLink.HandleChannelUpdate(htlc)
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}
// sendHtlcAliceToBob sends an HTLC from Alice to Bob, by first committing the
// HTLC in the circuit map, then delivering the outgoing packet to Alice's link.
// The HTLC will be sent to Bob via Alice's message stream.
func (l *linkTestContext) sendHtlcAliceToBob(htlcID int,
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htlc *lnwire.UpdateAddHTLC) {
l.t.Helper()
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circuitMap := l.aliceLink.(*channelLink).cfg.Switch.circuits
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fwdActions, err := circuitMap.CommitCircuits(
&PaymentCircuit{
Incoming: CircuitKey{
HtlcID: uint64(htlcID),
},
PaymentHash: htlc.PaymentHash,
},
)
if err != nil {
l.t.Fatalf("unable to commit circuit: %v", err)
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}
if len(fwdActions.Adds) != 1 {
l.t.Fatalf("expected 1 adds, found %d", len(fwdActions.Adds))
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}
err = l.aliceLink.HandleSwitchPacket(&htlcPacket{
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incomingHTLCID: uint64(htlcID),
htlc: htlc,
})
if err != nil {
l.t.Fatal(err)
}
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}
// receiveHtlcAliceToBob pulls the next message from Alice's message stream,
// asserts that it is an UpdateAddHTLC, then applies it to Bob's state machine.
func (l *linkTestContext) receiveHtlcAliceToBob() {
l.t.Helper()
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var msg lnwire.Message
select {
case msg = <-l.aliceMsgs:
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case <-time.After(15 * time.Second):
l.t.Fatalf("did not received htlc from alice")
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}
htlcAdd, ok := msg.(*lnwire.UpdateAddHTLC)
if !ok {
l.t.Fatalf("expected UpdateAddHTLC, got %T", msg)
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}
_, err := l.bobChannel.ReceiveHTLC(htlcAdd)
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if err != nil {
l.t.Fatalf("bob failed receiving htlc: %v", err)
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}
}
// sendCommitSigBobToAlice makes Bob sign a new commitment and send it to
// Alice, asserting that it signs expHtlcs number of HTLCs.
func (l *linkTestContext) sendCommitSigBobToAlice(expHtlcs int) {
l.t.Helper()
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sig, htlcSigs, _, err := l.bobChannel.SignNextCommitment()
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if err != nil {
l.t.Fatalf("error signing commitment: %v", err)
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}
commitSig := &lnwire.CommitSig{
CommitSig: sig,
HtlcSigs: htlcSigs,
}
if len(commitSig.HtlcSigs) != expHtlcs {
l.t.Fatalf("Expected %d htlc sigs, got %d", expHtlcs,
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len(commitSig.HtlcSigs))
}
l.aliceLink.HandleChannelUpdate(commitSig)
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}
// receiveRevAndAckAliceToBob waits for Alice to send a RevAndAck to Bob, then
// hands this to Bob.
func (l *linkTestContext) receiveRevAndAckAliceToBob() {
l.t.Helper()
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var msg lnwire.Message
select {
case msg = <-l.aliceMsgs:
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case <-time.After(15 * time.Second):
l.t.Fatalf("did not receive message")
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}
rev, ok := msg.(*lnwire.RevokeAndAck)
if !ok {
l.t.Fatalf("expected RevokeAndAck, got %T", msg)
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}
_, _, _, _, err := l.bobChannel.ReceiveRevocation(rev)
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if err != nil {
l.t.Fatalf("bob failed receiving revocation: %v", err)
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}
}
// receiveCommitSigAliceToBob waits for Alice to send a CommitSig to Bob,
// signing expHtlcs numbers of HTLCs, then hands this to Bob.
func (l *linkTestContext) receiveCommitSigAliceToBob(expHtlcs int) {
l.t.Helper()
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var msg lnwire.Message
select {
case msg = <-l.aliceMsgs:
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case <-time.After(15 * time.Second):
l.t.Fatalf("did not receive message")
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}
comSig, ok := msg.(*lnwire.CommitSig)
if !ok {
l.t.Fatalf("expected CommitSig, got %T", msg)
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}
if len(comSig.HtlcSigs) != expHtlcs {
l.t.Fatalf("expected %d htlc sigs, got %d", expHtlcs,
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len(comSig.HtlcSigs))
}
err := l.bobChannel.ReceiveNewCommitment(comSig.CommitSig,
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comSig.HtlcSigs)
if err != nil {
l.t.Fatalf("bob failed receiving commitment: %v", err)
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}
}
// sendRevAndAckBobToAlice make Bob revoke his current commitment, then hand
// the RevokeAndAck to Alice.
func (l *linkTestContext) sendRevAndAckBobToAlice() {
l.t.Helper()
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rev, _, err := l.bobChannel.RevokeCurrentCommitment()
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if err != nil {
l.t.Fatalf("unable to revoke commitment: %v", err)
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}
l.aliceLink.HandleChannelUpdate(rev)
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}
// receiveSettleAliceToBob waits for Alice to send a HTLC settle message to
// Bob, then hands this to Bob.
func (l *linkTestContext) receiveSettleAliceToBob() {
l.t.Helper()
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var msg lnwire.Message
select {
case msg = <-l.aliceMsgs:
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case <-time.After(15 * time.Second):
l.t.Fatalf("did not receive message")
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}
settleMsg, ok := msg.(*lnwire.UpdateFulfillHTLC)
if !ok {
l.t.Fatalf("expected UpdateFulfillHTLC, got %T", msg)
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}
err := l.bobChannel.ReceiveHTLCSettle(settleMsg.PaymentPreimage,
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settleMsg.ID)
if err != nil {
l.t.Fatalf("failed settling htlc: %v", err)
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}
}
// sendSettleBobToAlice settles an HTLC on Bob's state machine, then sends an
// UpdateFulfillHTLC message to Alice's upstream inbox.
func (l *linkTestContext) sendSettleBobToAlice(htlcID uint64,
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preimage lntypes.Preimage) {
l.t.Helper()
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err := l.bobChannel.SettleHTLC(preimage, htlcID, nil, nil, nil)
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if err != nil {
l.t.Fatalf("alice failed settling htlc id=%d hash=%x",
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htlcID, sha256.Sum256(preimage[:]))
}
settle := &lnwire.UpdateFulfillHTLC{
ID: htlcID,
PaymentPreimage: preimage,
}
l.aliceLink.HandleChannelUpdate(settle)
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}
// receiveSettleAliceToBob waits for Alice to send a HTLC settle message to
// Bob, then hands this to Bob.
func (l *linkTestContext) receiveFailAliceToBob() {
l.t.Helper()
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var msg lnwire.Message
select {
case msg = <-l.aliceMsgs:
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case <-time.After(15 * time.Second):
l.t.Fatalf("did not receive message")
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}
failMsg, ok := msg.(*lnwire.UpdateFailHTLC)
if !ok {
l.t.Fatalf("expected UpdateFailHTLC, got %T", msg)
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}
err := l.bobChannel.ReceiveFailHTLC(failMsg.ID, failMsg.Reason)
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if err != nil {
l.t.Fatalf("unable to apply received fail htlc: %v", err)
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}
}