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multi: use new revocation log when creating breach retribution

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This commit changes the `NewBreachRetribution` to use the new revocation
log format, while maintaining the compatibilty to use an older
revocation log format. Unit tests have been added to make sure a breach
retribution can be created in both log formats.

This also means the watch tower needs to pass the relevant commit tx at
its backup height when creating the breach retribution during backing
up. This is achieved by recording the current remote commitment state
before advancing the remote commitment chain.
This commit is contained in:
yyforyongyu
2022-04-13 22:33:07 +08:00
parent 953767961e
commit 22d98ca6d5
5 changed files with 693 additions and 127 deletions
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16
htlcswitch/link.go
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@@ -1897,9 +1897,16 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) {
// We've received a revocation from the remote chain, if valid,
// this moves the remote chain forward, and expands our
// revocation window.
fwdPkg, adds, settleFails, remoteHTLCs, err := l.channel.ReceiveRevocation(
msg,
)
//
// Before advancing our remote chain, we will record the
// current commit tx, which is used by the TowerClient to
// create backups.
oldCommitTx := l.channel.State().RemoteCommitment.CommitTx
// We now process the message and advance our remote commit
// chain.
fwdPkg, adds, settleFails, remoteHTLCs, err := l.channel.
ReceiveRevocation(msg)
if err != nil {
// TODO(halseth): force close?
l.fail(LinkFailureError{code: ErrInvalidRevocation},
@@ -1928,10 +1935,13 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) {
}
// If we have a tower client for this channel type, we'll
// create a backup for the current state.
if l.cfg.TowerClient != nil {
state := l.channel.State()
breachInfo, err := lnwallet.NewBreachRetribution(
state, state.RemoteCommitment.CommitHeight-1, 0,
// OldCommitTx is the breaching tx at height-1.
oldCommitTx,
)
if err != nil {
l.fail(LinkFailureError{code: ErrInternalError},