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contractcourt/chain_watcher: register for confirmed spend, mark closed when detected

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This commit changes the ChainWatcher to only send a chain event in case
the various spends are _confirmed_ on-chain, not only seen on the
network.

A consequence of this is that we now give the ChainWatcher the
responsibility of marking the channel closed when the closing tx is
confirmed, instead of the ChannelArbitrator.
This commit is contained in:
Johan T. Halseth 2018-03-27 14:06:34 +02:00
parent 1265c9cc99
commit 854e73b8e0
No known key found for this signature in database
GPG Key ID: 15BAADA29DA20D26
1 changed files with 33 additions and 1 deletions
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34
contractcourt/chain_watcher.go
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@ -190,7 +190,7 @@ func (c *chainWatcher) Start() error {
}
spendNtfn, err := c.notifier.RegisterSpendNtfn(
fundingOut, heightHint, true,
fundingOut, heightHint, false,
)
if err != nil {
return err
@ -534,6 +534,38 @@ func (c *chainWatcher) dispatchLocalForceClose(
return err
}
// As we've detected that the channel has been closed, immediately
// delete the state from disk, creating a close summary for future
// usage by related sub-systems.
chanSnapshot := forceClose.ChanSnapshot
closeSummary := &channeldb.ChannelCloseSummary{
ChanPoint: chanSnapshot.ChannelPoint,
ChainHash: chanSnapshot.ChainHash,
ClosingTXID: forceClose.CloseTx.TxHash(),
RemotePub: &chanSnapshot.RemoteIdentity,
Capacity: chanSnapshot.Capacity,
CloseType: channeldb.LocalForceClose,
IsPending: true,
ShortChanID: c.chanState.ShortChanID,
CloseHeight: uint32(commitSpend.SpendingHeight),
}
// If our commitment output isn't dust or we have active HTLC's on the
// commitment transaction, then we'll populate the balances on the
// close channel summary.
if forceClose.CommitResolution != nil {
closeSummary.SettledBalance = chanSnapshot.LocalBalance.ToSatoshis()
closeSummary.TimeLockedBalance = chanSnapshot.LocalBalance.ToSatoshis()
}
for _, htlc := range forceClose.HtlcResolutions.OutgoingHTLCs {
htlcValue := btcutil.Amount(htlc.SweepSignDesc.Output.Value)
closeSummary.TimeLockedBalance += htlcValue
}
err = c.chanState.CloseChannel(closeSummary)
if err != nil {
return fmt.Errorf("unable to delete channel state: %v", err)
}
// With the event processed, we'll now notify all subscribers of the
// event.
closeInfo := &LocalUnilateralCloseInfo{commitSpend, forceClose}