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lnwallet: add the second level witness script to the HtlcRetribution

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In this commit, we add the second level witness script to the
HtlcRetribution struct. We do this as it’s possible that we when
attempt to sweep funds after a channel breach, then the remote party
has already gone to the second layer. In this case, we’ll then need to
update our SignDesc and also the witness, in order to do that we need
this script that’ll get us pass the second layer P2WSH check.
This commit is contained in:
Olaoluwa Osuntokun 2018-01-20 20:12:49 -08:00
parent 967a9ca7de
commit f85f1f97ca
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GPG Key ID: 964EA263DD637C21
1 changed files with 20 additions and 1 deletions
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21
lnwallet/channel.go
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@ -1640,6 +1640,13 @@ type HtlcRetribution struct {
// breached commitment transaction.
OutPoint wire.OutPoint
// SecondLevelWitnessScript is the witness script that will be created
// if the second level HTLC transaction for this output is
// broadcast/confirmed. We provide this as if the remote party attempts
// to to go the second level to claim the HTLC then we'll need to
// update the SignDesc above accordingly to sweep properly.
SecondLevelWitnessScript []byte
// IsIncoming is a boolean flag that indicates whether or not this
// HTLC was accepted from the counterparty. A false value indicates that
// this HTLC was offered by us. This flag is used determine the exact
@ -1825,6 +1832,17 @@ func NewBreachRetribution(chanState *channeldb.OpenChannel, stateNum uint64,
err error
)
// We'll generate the original second level witness script now,
// as we'll need it if we're revoking an HTLC output on the
// remote commitment transaction, and *they* go to the second
// level.
secondLevelWitnessScript, err := secondLevelHtlcScript(
keyRing.RevocationKey, keyRing.DelayKey, remoteDelay,
)
if err != nil {
return nil, err
}
// If this is an incoming HTLC, then this means that they were
// the sender of the HTLC (relative to us). So we'll
// re-generate the sender HTLC script.
@ -1865,7 +1883,8 @@ func NewBreachRetribution(chanState *channeldb.OpenChannel, stateNum uint64,
Hash: commitHash,
Index: uint32(htlc.OutputIndex),
},
IsIncoming: htlc.Incoming,
SecondLevelWitnessScript: secondLevelWitnessScript,
IsIncoming: htlc.Incoming,
}
}