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Merge pull request #9727 from guggero/strict-forwarding

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Aux bandwidth manager: also pass HTLC blob to `ShouldHandleTraffic`
This commit is contained in:
Oliver Gugger 2025-04-17 14:00:46 +02:00 committed by GitHub
commit c25f98f5b9
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4 changed files with 10 additions and 3 deletions
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2
htlcswitch/interfaces.go
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@ -509,7 +509,7 @@ type AuxTrafficShaper interface {
// identified by the provided channel ID may have external mechanisms
// that would allow it to carry out the payment.
ShouldHandleTraffic(cid lnwire.ShortChannelID,
fundingBlob fn.Option[tlv.Blob]) (bool, error)
fundingBlob, htlcBlob fn.Option[tlv.Blob]) (bool, error)
// PaymentBandwidth returns the available bandwidth for a custom channel
// decided by the given channel aux blob and HTLC blob. A return value

2
htlcswitch/link.go
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@ -3484,7 +3484,7 @@ func (l *channelLink) AuxBandwidth(amount lnwire.MilliSatoshi,
ts AuxTrafficShaper) fn.Result[OptionalBandwidth] {
fundingBlob := l.FundingCustomBlob()
shouldHandle, err := ts.ShouldHandleTraffic(cid, fundingBlob)
shouldHandle, err := ts.ShouldHandleTraffic(cid, fundingBlob, htlcBlob)
if err != nil {
return fn.Err[OptionalBandwidth](fmt.Errorf("traffic shaper "+
"failed to decide whether to handle traffic: %w", err))

7
htlcswitch/switch.go
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@ -1149,6 +1149,9 @@ func (s *Switch) handlePacketForward(packet *htlcPacket) error {
func (s *Switch) checkCircularForward(incoming, outgoing lnwire.ShortChannelID,
allowCircular bool, paymentHash lntypes.Hash) *LinkError {
log.Tracef("Checking for circular route: incoming=%v, outgoing=%v "+
"(payment hash: %x)", incoming, outgoing, paymentHash[:])
// If they are equal, we can skip the alias mapping checks.
if incoming == outgoing {
// The switch may be configured to allow circular routes, so
@ -1189,6 +1192,10 @@ func (s *Switch) checkCircularForward(incoming, outgoing lnwire.ShortChannelID,
// Check base SCID equality.
if incomingBaseScid != outgoingBaseScid {
log.Tracef("Incoming base SCID %v does not match outgoing "+
"base SCID %v (payment hash: %x)", incomingBaseScid,
outgoingBaseScid, paymentHash[:])
// The base SCIDs are not equal so these are not the same
// channel.
return nil

2
routing/bandwidth_test.go
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@ -140,7 +140,7 @@ type mockTrafficShaper struct{}
// by the provided channel ID may have external mechanisms that would
// allow it to carry out the payment.
func (*mockTrafficShaper) ShouldHandleTraffic(_ lnwire.ShortChannelID,
_ fn.Option[tlv.Blob]) (bool, error) {
_, _ fn.Option[tlv.Blob]) (bool, error) {
return true, nil
}