From 794dfd5bf31c0c44d7cb4613eded74ed01cae1c8 Mon Sep 17 00:00:00 2001
From: Jinqiu Yu <yujinqiuustb@gmail.com>
Date: Tue, 6 Mar 2018 15:24:52 +0800
Subject: [PATCH] Dedup protocol registration

---
 transport/internet/config.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/transport/internet/config.go b/transport/internet/config.go
index 72d20f8e..b97246fc 100644
--- a/transport/internet/config.go
+++ b/transport/internet/config.go
@@ -10,7 +10,9 @@ var (
 )
 
 func RegisterProtocolConfigCreator(protocol TransportProtocol, creator ConfigCreator) error {
-	// TODO: check duplicate
+	if _, found := globalTransportConfigCreatorCache[protocol]; found {
+		return newError("protocol: " + TransportProtocol_name[int32(protocol)]+ " is already registered").AtError()
+	}
 	globalTransportConfigCreatorCache[protocol] = creator
 	return nil
 }