From fa918df86d61c6a0f6e440d7b1bffa93a16af0ee Mon Sep 17 00:00:00 2001
From: Evan Lin <evanlinjin@pm.me>
Date: Fri, 6 Sep 2019 14:39:29 +0800
Subject: [PATCH] Fixed behaviour of boltdb routing table to return error when
 rule does not exist.

---
 pkg/routing/boltdb_routing_table.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkg/routing/boltdb_routing_table.go b/pkg/routing/boltdb_routing_table.go
index 1e85ea6a9b..033a6da9cc 100644
--- a/pkg/routing/boltdb_routing_table.go
+++ b/pkg/routing/boltdb_routing_table.go
@@ -76,7 +76,9 @@ func (rt *boltDBRoutingTable) Rule(routeID RouteID) (Rule, error) {
 		rule = b.Get(binaryID(routeID))
 		return nil
 	})
-
+	if rule == nil {
+		return nil, fmt.Errorf("rule of routeID '%v' does not exist", routeID)
+	}
 	return rule, err
 }