localchans: log policy update error

log.go

@@ -31,6 +31,7 @@ import (
 	"github.com/lightningnetwork/lnd/netann"
 	"github.com/lightningnetwork/lnd/peernotifier"
 	"github.com/lightningnetwork/lnd/routing"
+	"github.com/lightningnetwork/lnd/routing/localchans"
 	"github.com/lightningnetwork/lnd/signal"
 	"github.com/lightningnetwork/lnd/sweep"
 	"github.com/lightningnetwork/lnd/watchtower"
@@ -99,6 +100,7 @@ func init() {
 	addSubLogger("CHFD", chanfunding.UseLogger)
 
 	addSubLogger(routing.Subsystem, routing.UseLogger)
+	addSubLogger(routing.Subsystem, localchans.UseLogger)
 	addSubLogger(routerrpc.Subsystem, routerrpc.UseLogger)
 	addSubLogger(wtclientrpc.Subsystem, wtclientrpc.UseLogger)
 	addSubLogger(chanfitness.Subsystem, chanfitness.UseLogger)

routing/localchans/log.go

@@ -0,0 +1,16 @@
+package localchans
+
+import (
+	"github.com/btcsuite/btclog"
+)
+
+// log is a logger that is initialized with no output filters.  This
+// means the package will not perform any logging by default until the caller
+// requests it.
+var log btclog.Logger
+
+// UseLogger uses a specified Logger to output package logging info. This
+// function is called from the parent package htlcswitch logger initialization.
+func UseLogger(logger btclog.Logger) {
+	log = logger
+}

routing/localchans/manager.go

@@ -79,6 +79,9 @@ func (r *Manager) UpdatePolicy(newSchema routing.ChannelPolicy,
 		// Apply the new policy to the edge.
 		err := r.updateEdge(info.ChannelPoint, edge, newSchema)
 		if err != nil {
+			log.Warnf("Cannot update policy for %v: %v\n",
+				info.ChannelPoint, err,
+			)
 			return nil
 		}