rpcserver: return full path payments go over in SendPayment

This commit augments the server’s response to successful SendPayment
commands by also returning the full path taken in order to fulfill the
payment. With this information, the user now obtains more context about
their payment whcih can be useful when debugging, or just exploring the
capabilities of the daemon.

rpcserver.go

@@ -915,7 +915,9 @@ func (r *rpcServer) SendPayment(paymentStream lnrpc.Lightning_SendPaymentServer)
 				}
 
 				// TODO(roasbeef): proper responses
-				resp := &lnrpc.SendResponse{}
+				resp := &lnrpc.SendResponse{
+					PaymentRoute: marshalRoute(route),
+				}
 				if err := paymentStream.Send(resp); err != nil {
 					errChan <- err
 					return
@@ -1560,9 +1562,13 @@ func (r *rpcServer) QueryRoute(_ context.Context, in *lnrpc.RouteRequest) (*lnrp
 		return nil, err
 	}
 
-	// If a route exsits within the network that is able to support our
+	// If a route exists within the network that is able to support our
 	// request, then we'll convert the result into the format required by
 	// the RPC system.
+	return marshalRoute(route), nil
+}
+
+func marshalRoute(route *routing.Route) *lnrpc.Route {
 	resp := &lnrpc.Route{
 		TotalTimeLock: route.TotalTimeLock,
 		TotalFees:     int64(route.TotalFees),
@@ -1578,7 +1584,7 @@ func (r *rpcServer) QueryRoute(_ context.Context, in *lnrpc.RouteRequest) (*lnrp
 		}
 	}
 
-	return resp, nil
+	return resp
 }
 
 // GetNetworkInfo returns some basic stats about the known channel graph from

utxonursery.go

@@ -231,6 +231,8 @@ func (u *utxoNursery) catchUpKindergarten() error {
 		}
 	}
 
+	utxnLog.Infof("UTXO Nursery is now fully synced")
+
 	return nil
 }