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htlcswitch: once we discover a pre-image, add it to the witness cache 

In this commit, we add some additional logic to the case when we
receive a pre-image from an upstream peer. We’ll immediately add it to
the witness cache, as an incoming HTLC might be waiting on-chain to
fully resolve the HTLC with knowledge of the newly discovered
pre-image.
This commit is contained in:
Olaoluwa Osuntokun 2018-01-16 20:13:16 -08:00
parent 9cb3657314
commit f2642a70db
No known key found for this signature in database
GPG Key ID: 964EA263DD637C21
1 changed files with 16 additions and 4 deletions
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20
htlcswitch/link.go
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@ -120,6 +120,11 @@ type ChannelLinkConfig struct {
// in thread-safe manner.
Registry InvoiceDatabase
// PreimageCache is a global witness baacon that houses any new
// preimges discovered by other links. We'll use this to add new
// witnesses that we discover which will notify any sub-systems
// subscribed to new events.
PreimageCache contractcourt.WitnessBeacon
// FeeEstimator is an instance of a live fee estimator which will be
// used to dynamically regulate the current fee of the commitment
// transaction to ensure timely confirmation.
@ -840,8 +845,15 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) {
return
}
// TODO(roasbeef): add preimage to DB in order to swipe
// repeated r-values
// TODO(roasbeef): pipeline to switch
// As we've learned of a new preimage for the first time, we'll
// add it to to our preimage cache. By doing this, we ensure
// any contested contracts watched by any on-chain arbitrators
// can now sweep this HTLC on-chain.
if err := l.cfg.PreimageCache.AddPreimage(pre[:]); err != nil {
log.Errorf("unable to add preimage=%x to cache", pre[:])
}
case *lnwire.UpdateFailMalformedHTLC:
// Convert the failure type encoded within the HTLC fail
@ -918,7 +930,7 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) {
// As we've just just accepted a new state, we'll now
// immediately send the remote peer a revocation for our prior
// state.
nextRevocation, err := l.channel.RevokeCurrentCommitment()
nextRevocation, currentHtlcs, err := l.channel.RevokeCurrentCommitment()
if err != nil {
log.Errorf("unable to revoke commitment: %v", err)
return
@ -1478,7 +1490,7 @@ func (l *channelLink) processLockedInHtlcs(
// we'll cancel the HTLC directly.
if pd.Amount < l.cfg.FwrdingPolicy.MinHTLC {
log.Errorf("Incoming htlc(%x) is too "+
"small: min_htlc=%v, hltc_value=%v",
"small: min_htlc=%v, htlc_value=%v",
pd.RHash[:], l.cfg.FwrdingPolicy.MinHTLC,
pd.Amount)