merge similar error definitions

app/router/config_cache.go

@@ -1,15 +1,13 @@
 package router
 
 import (
-	"errors"
+	"github.com/v2ray/v2ray-core/common"
 )
 
 type ConfigObjectCreator func([]byte) (interface{}, error)
 
 var (
 	configCache map[string]ConfigObjectCreator
-
-	ErrRouterNotFound = errors.New("Router not found.")
 )
 
 func RegisterRouterConfig(strategy string, creator ConfigObjectCreator) error {
@@ -21,7 +19,7 @@ func RegisterRouterConfig(strategy string, creator ConfigObjectCreator) error {
 func CreateRouterConfig(strategy string, data []byte) (interface{}, error) {
 	creator, found := configCache[strategy]
 	if !found {
-		return nil, ErrRouterNotFound
+		return nil, common.ErrObjectNotFound
 	}
 	return creator(data)
 }

app/router/router.go

@@ -3,6 +3,7 @@ package router
 import (
 	"github.com/v2ray/v2ray-core/app"
 	"github.com/v2ray/v2ray-core/common"
+	"github.com/v2ray/v2ray-core/common/log"
 	v2net "github.com/v2ray/v2ray-core/common/net"
 )
 
@@ -24,7 +25,9 @@ var (
 )
 
 func RegisterRouter(name string, factory RouterFactory) error {
-	// TODO: check name
+	if _, found := routerCache[name]; found {
+		return common.ErrDuplicatedName
+	}
 	routerCache[name] = factory
 	return nil
 }
@@ -33,5 +36,6 @@ func CreateRouter(name string, rawConfig interface{}, space app.Space) (Router,
 	if factory, found := routerCache[name]; found {
 		return factory.Create(rawConfig, space)
 	}
-	return nil, ErrRouterNotFound
+	log.Error("Router: not found: ", name)
+	return nil, common.ErrObjectNotFound
 }