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lnwallet: populate HTLC resolutions within the ForceCloseSummary

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This commit is contained in:
Olaoluwa Osuntokun 2017-07-30 13:21:26 -07:00
parent 83e0116d7e
commit 01aa4eb2ae
No known key found for this signature in database
GPG key ID: 9CC5B105D03521A2
1 changed files with 35 additions and 15 deletions
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50
lnwallet/channel.go
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@ -3479,16 +3479,20 @@ func (lc *LightningChannel) ForceClose() (*ForceCloseSummary, error) {
// commitment transaction. We'll need this to find the corresponding
// output in the commitment transaction and potentially for creating
// the sign descriptor.
csvTimeout := lc.channelState.LocalCsvDelay
selfKey := lc.channelState.OurCommitKey
producer := lc.channelState.RevocationProducer
unusedRevocation, err := producer.AtIndex(lc.currentHeight)
csvTimeout := uint32(lc.localChanCfg.CsvDelay)
unusedRevocation, err := lc.channelState.RevocationProducer.AtIndex(
lc.currentHeight,
)
if err != nil {
return nil, err
}
revokeKey := DeriveRevocationPubkey(lc.channelState.TheirCommitKey,
unusedRevocation[:])
selfScript, err := commitScriptToSelf(csvTimeout, selfKey, revokeKey)
commitPoint := ComputeCommitmentPoint(unusedRevocation[:])
revokeKey := DeriveRevocationPubkey(
lc.remoteChanCfg.RevocationBasePoint,
commitPoint,
)
delayKey := TweakPubKey(lc.localChanCfg.DelayBasePoint, commitPoint)
selfScript, err := commitScriptToSelf(csvTimeout, delayKey, revokeKey)
if err != nil {
return nil, err
}
@ -3500,11 +3504,11 @@ func (lc *LightningChannel) ForceClose() (*ForceCloseSummary, error) {
// Locate the output index of the delayed commitment output back to us.
// We'll return the details of this output to the caller so they can
// sweep it once it's mature.
// TODO(roasbeef): also return HTLC info, assumes only p2wsh is commit
// tx
var delayIndex uint32
var delayScript []byte
var selfSignDesc *SignDescriptor
var (
delayIndex uint32
delayScript []byte
selfSignDesc *SignDescriptor
)
for i, txOut := range commitTx.TxOut {
if !bytes.Equal(payToUsScriptHash, txOut.PkScript) {
continue
@ -3519,10 +3523,14 @@ func (lc *LightningChannel) ForceClose() (*ForceCloseSummary, error) {
// descriptor which is capable of generating the signature the caller
// needs to sweep this output. The hash cache, and input index are not
// set as the caller will decide these values once sweeping the output.
// If the output is non-existant (dust), have the sign descriptor be nil.
// If the output is non-existent (dust), have the sign descriptor be
// nil.
if len(delayScript) != 0 {
singleTweak := SingleTweakBytes(commitPoint,
lc.localChanCfg.DelayBasePoint)
selfSignDesc = &SignDescriptor{
PubKey: selfKey,
PubKey: lc.localChanCfg.DelayBasePoint,
SingleTweak: singleTweak,
WitnessScript: selfScript,
Output: &wire.TxOut{
PkScript: delayScript,
@ -3532,6 +3540,17 @@ func (lc *LightningChannel) ForceClose() (*ForceCloseSummary, error) {
}
}
// Once the delay output has been found (if it exists), then we'll also
// need to create a series of sign descriptors for any lingering
// outgoing HTLC's that we'll need to claim as well.
txHash := commitTx.TxHash()
htlcResolutions, _, err := extractHtlcResolutions(
lc.channelState.FeePerKw, true, lc.signer, lc.channelState.Htlcs,
commitPoint, revokeKey, lc.localChanCfg, lc.remoteChanCfg, txHash)
if err != nil {
return nil, err
}
// Finally, close the channel force close signal which notifies any
// subscribers that the channel has now been forcibly closed. This
// allows callers to begin to carry out any post channel closure
@ -3544,9 +3563,10 @@ func (lc *LightningChannel) ForceClose() (*ForceCloseSummary, error) {
Hash: commitTx.TxHash(),
Index: delayIndex,
},
SelfOutputMaturity: csvTimeout,
CloseTx: commitTx,
SelfOutputSignDesc: selfSignDesc,
SelfOutputMaturity: csvTimeout,
HtlcResolutions: htlcResolutions,
}, nil
}