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peer: add logic to dispatch justice after revoke state broadcast

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This commit adds the necessary logic a peer’s htlcManger goroutine to
dispatch justice (sweeping all the funds in a channel) after it has
been detected that the counter-party has broadcast a prior revoked
commitment state.

The task to generate the justice transaction is handed off to the
utxoNursery. Once the nursery has finished its duty, the peer launches
a new goroutine which will delete the state of the channel once the
justice transaction has been confirmed within a block.
This commit is contained in:
Olaoluwa Osuntokun 2016-11-21 13:32:19 -06:00
parent a29cd563f6
commit 31e65e3333
No known key found for this signature in database
GPG Key ID: 9CC5B105D03521A2
1 changed files with 45 additions and 4 deletions
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49
peer.go
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@ -723,7 +723,7 @@ func (p *peer) executeForceClose(channel *lnwallet.LightningChannel) (*wire.ShaH
// With the close transaction in hand, broadcast the transaction to the
// network, thereby entering the psot channel resolution state.
peerLog.Infof("Broadcasting force close transaction: %v",
peerLog.Infof("Broadcasting force close transaction, ChannelPoint(%v): %v",
channel.ChannelPoint(), newLogClosure(func() string {
return spew.Sdump(closeTx)
}))
@ -1052,15 +1052,56 @@ out:
peerLog.Errorf("unable to wipe channel %v", err)
}
// TODO(roasbeef): send info about current HTLC's to
// utxoNursery
break out
case <-channel.ForceCloseSignal:
peerLog.Warnf("ChannelPoint(%v) has been force "+
"closed, disconnecting from peerID(%x)",
state.chanPoint, p.id)
break out
//p.Disconnect()
case breachInfo := <-channel.ContractBreach:
peerLog.Warnf("REVOKED STATE #%v FOR ChannelPoint(%v) "+
"broadcast, REMOTE PEER IS DOING SOMETHING "+
"SKETCHY!!!", breachInfo.RevokedStateNum,
state.chanPoint)
// We've just been notified by the channel's state
// machine that a contract breaching uncooperative
// close has been detected. According to the contract,
// we're entitled to ALL the funds remaining in the
// channel, so we send the breach information to the
// utxoNursery which will sweep the funds into the
// wallet.
doneChan := p.server.utxoNursery.sweepRevokedFunds(breachInfo)
// TODO(roasbeef): factor in HTLC's
revokedFunds := breachInfo.RemoteOutputSignDesc.Output.Value
totalFunds := revokedFunds + breachInfo.LocalOutputSignDesc.Output.Value
// Launch a goroutine which will block until the
// utxoNursery has successfully claimed all pending
// funds within the channel. Afterwards, we can clean
// up the on-disk channel state.
go func() {
<-doneChan
peerLog.Infof("Justice for ChannelPoint(%v) has "+
"been served, %v revoked funds (%v total) "+
"have been claimed", state.chanPoint,
revokedFunds, totalFunds)
// TODO(roasbeef): chan should switch into
// contested state above
if err := wipeChannel(p, channel); err != nil {
peerLog.Errorf("unable to wipe channel %v", err)
}
}()
// TODO(roasbeef): backwards cancel any pending HTLC's
// on current commitment transaction?
// * also close other active channels w/ peer
// TODO(roasbeef): add peer to blacklist?
break out
// TODO(roasbeef): prevent leaking ticker?
case <-state.logCommitTimer:
// If we haven't sent or received a new commitment