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htlcswitch/link: add failed variable to ensure exit

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This commit is contained in:
Johan T. Halseth 2018-05-23 15:14:46 +02:00
parent d0b0734e5b
commit f95ae1cdd6
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GPG Key ID: 15BAADA29DA20D26
1 changed files with 40 additions and 2 deletions
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42
htlcswitch/link.go
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@ -254,6 +254,10 @@ type channelLink struct {
started int32
shutdown int32
// failed should be set to true in case a link error happens, making
// sure we don't process any more updates.
failed bool
// batchCounter is the number of updates which we received from remote
// side, but not include in commitment transaction yet and plus the
// current number of settles that have been sent, but not yet committed
@ -695,6 +699,14 @@ func (l *channelLink) resolveFwdPkg(fwdPkg *channeldb.FwdPkg) (bool, error) {
fwdPkg.Source, fwdPkg.Height, fwdPkg.Adds,
)
needUpdate = l.processRemoteAdds(fwdPkg, adds)
// If the link failed during processing the adds, we must
// return to ensure we won't attempted to update the state
// further.
if l.failed {
return false, fmt.Errorf("link failed while " +
"processing remote adds")
}
}
return needUpdate, nil
@ -805,9 +817,16 @@ func (l *channelLink) htlcManager() {
batchTick := l.cfg.BatchTicker.Start()
defer l.cfg.BatchTicker.Stop()
// TODO(roasbeef): fail chan in case of protocol violation
out:
for {
// We must always check if we failed at some point processing
// the last update before processing the next.
if l.failed {
l.errorf("link failed, exiting htlcManager")
break out
}
select {
// A new block has arrived, we'll check the network fee to see
@ -1363,8 +1382,15 @@ func (l *channelLink) handleUpstreamMsg(msg lnwire.Message) {
}
l.processRemoteSettleFails(fwdPkg, settleFails)
needUpdate := l.processRemoteAdds(fwdPkg, adds)
// If the link failed during processing the adds, we must
// return to ensure we won't attempted to update the state
// further.
if l.failed {
return
}
if needUpdate {
if err := l.updateCommitTx(); err != nil {
l.fail(LinkFailureError{code: ErrInternalError},
@ -2543,7 +2569,19 @@ func (l *channelLink) sendMalformedHTLCError(htlcIndex uint64,
func (l *channelLink) fail(linkErr LinkFailureError,
format string, a ...interface{}) {
reason := errors.Errorf(format, a...)
// Return if we have already notified about a failure.
if l.failed {
l.warnf("Ignoring link failure (%v), as link already failed",
reason)
return
}
l.errorf("Failing link: %s", reason)
// Set failed, such that we won't process any more updates, and notify
// the peer about the failure.
l.failed = true
l.cfg.OnChannelFailure(l.ChanID(), l.ShortChanID(), linkErr)
}