routing/ntfns+rpcserver: include max htlc in topology notifications

routing/notifications.go

@@ -266,6 +266,9 @@ type ChannelEdgeUpdate struct {
 	// MinHTLC is the minimum HTLC amount that this channel will forward.
 	MinHTLC lnwire.MilliSatoshi
 
+	// MaxHTLC is the maximum HTLC amount that this channel will forward.
+	MaxHTLC lnwire.MilliSatoshi
+
 	// BaseFee is the base fee that will charged for all HTLC's forwarded
 	// across the this channel direction.
 	BaseFee lnwire.MilliSatoshi
@@ -359,6 +362,7 @@ func addToTopologyChange(graph *channeldb.ChannelGraph, update *TopologyChange,
 			TimeLockDelta:   m.TimeLockDelta,
 			Capacity:        edgeInfo.Capacity,
 			MinHTLC:         m.MinHTLC,
+			MaxHTLC:         m.MaxHTLC,
 			BaseFee:         m.FeeBaseMSat,
 			FeeRate:         m.FeeProportionalMillionths,
 			AdvertisingNode: aNode,

routing/notifications_test.go

@@ -77,6 +77,7 @@ func randEdgePolicy(chanID *lnwire.ShortChannelID,
 		LastUpdate:                time.Unix(int64(prand.Int31()), 0),
 		TimeLockDelta:             uint16(prand.Int63()),
 		MinHTLC:                   lnwire.MilliSatoshi(prand.Int31()),
+		MaxHTLC:                   lnwire.MilliSatoshi(prand.Int31()),
 		FeeBaseMSat:               lnwire.MilliSatoshi(prand.Int31()),
 		FeeProportionalMillionths: lnwire.MilliSatoshi(prand.Int31()),
 		Node:                      node,
@@ -435,6 +436,11 @@ func TestEdgeUpdateNotification(t *testing.T) {
 				"expected %v, got %v", edgeAnn.MinHTLC,
 				edgeUpdate.MinHTLC)
 		}
+		if edgeUpdate.MaxHTLC != edgeAnn.MaxHTLC {
+			t.Fatalf("max HTLC of edge doesn't match: "+
+				"expected %v, got %v", edgeAnn.MaxHTLC,
+				edgeUpdate.MaxHTLC)
+		}
 		if edgeUpdate.BaseFee != edgeAnn.FeeBaseMSat {
 			t.Fatalf("base fee of edge doesn't match: "+
 				"expected %v, got %v", edgeAnn.FeeBaseMSat,

rpcserver.go

@@ -4408,6 +4408,7 @@ func marshallTopologyChange(topChange *routing.TopologyChange) *lnrpc.GraphTopol
 			RoutingPolicy: &lnrpc.RoutingPolicy{
 				TimeLockDelta:    uint32(channelUpdate.TimeLockDelta),
 				MinHtlc:          int64(channelUpdate.MinHTLC),
+				MaxHtlc:          uint64(channelUpdate.MaxHTLC),
 				FeeBaseMsat:      int64(channelUpdate.BaseFee),
 				FeeRateMilliMsat: int64(channelUpdate.FeeRate),
 				Disabled:         channelUpdate.Disabled,