multi: surface may add outgoing hltc

htlcswitch/interfaces.go

@@ -145,6 +145,10 @@ type ChannelLink interface {
 	// will use this function in forwarding decisions accordingly.
 	EligibleToForward() bool
 
+	// MayAddOutgoingHtlc returns an error if we may not add an outgoing
+	// htlc to the channel.
+	MayAddOutgoingHtlc() error
+
 	// AttachMailBox delivers an active MailBox to the link. The MailBox may
 	// have buffered messages.
 	AttachMailBox(MailBox)

htlcswitch/link.go

@@ -2156,6 +2156,12 @@ func (l *channelLink) Bandwidth() lnwire.MilliSatoshi {
 	return l.channel.AvailableBalance()
 }
 
+// MayAddOutgoingHtlc indicates whether we may add any more outgoing htlcs to
+// this channel.
+func (l *channelLink) MayAddOutgoingHtlc() error {
+	return l.channel.MayAddOutgoingHtlc()
+}
+
 // AttachMailBox updates the current mailbox used by this link, and hooks up
 // the mailbox's message and packet outboxes to the link's upstream and
 // downstream chans, respectively.

htlcswitch/mock.go

@@ -756,6 +756,7 @@ func (f *mockChannelLink) Peer() lnpeer.Peer                            { return
 func (f *mockChannelLink) ChannelPoint() *wire.OutPoint                 { return &wire.OutPoint{} }
 func (f *mockChannelLink) Stop()                                        {}
 func (f *mockChannelLink) EligibleToForward() bool                      { return f.eligible }
+func (f *mockChannelLink) MayAddOutgoingHtlc() error                    { return nil }
 func (f *mockChannelLink) setLiveShortChanID(sid lnwire.ShortChannelID) { f.shortChanID = sid }
 func (f *mockChannelLink) UpdateShortChanID() (lnwire.ShortChannelID, error) {
 	f.eligible = true