routerrpc+cmd: use skip_temp_err when sending to route

cmd/lncli/cmd_payments.go

@@ -873,6 +873,13 @@ var sendToRouteCommand = cli.Command{
 			Usage: "a json array string in the format of the response " +
 				"of queryroutes that denotes which routes to use",
 		},
+		cli.BoolFlag{
+			Name: "skip_temp_err",
+			Usage: "Whether the payment should be marked as " +
+				"failed when a temporary error occurred. Set " +
+				"it to true so the payment won't be failed " +
+				"unless a terminal error has occurred.",
+		},
 	},
 	Action: sendToRoute,
 }
@@ -966,6 +973,7 @@ func sendToRoute(ctx *cli.Context) error {
 	req := &routerrpc.SendToRouteRequest{
 		PaymentHash: rHash,
 		Route:       route,
+		SkipTempErr: ctx.Bool("skip_temp_err"),
 	}
 
 	return sendToRouteRequest(ctx, req)

lnrpc/routerrpc/router_server.go

@@ -399,13 +399,19 @@ func (s *Server) SendToRouteV2(ctx context.Context,
 		return nil, err
 	}
 
+	var attempt *channeldb.HTLCAttempt
+
 	// Pass route to the router. This call returns the full htlc attempt
 	// information as it is stored in the database. It is possible that both
 	// the attempt return value and err are non-nil. This can happen when
 	// the attempt was already initiated before the error happened. In that
 	// case, we give precedence to the attempt information as stored in the
 	// db.
-	attempt, err := s.cfg.Router.SendToRoute(hash, route)
+	if req.SkipTempErr {
+		attempt, err = s.cfg.Router.SendToRouteSkipTempErr(hash, route)
+	} else {
+		attempt, err = s.cfg.Router.SendToRoute(hash, route)
+	}
 	if attempt != nil {
 		rpcAttempt, err := s.cfg.RouterBackend.MarshalHTLCAttempt(
 			*attempt,