Move connection handler interfaces to proxy/common/connhandler

proxy/common/connhandler/proxy_cache.go

@@ -0,0 +1,34 @@
+package connhandler
+
+var (
+	inboundFactories  = make(map[string]InboundConnectionHandlerFactory)
+	outboundFactories = make(map[string]OutboundConnectionHandlerFactory)
+)
+
+func RegisterInboundConnectionHandlerFactory(name string, factory InboundConnectionHandlerFactory) error {
+	// TODO check name
+	inboundFactories[name] = factory
+	return nil
+}
+
+func RegisterOutboundConnectionHandlerFactory(name string, factory OutboundConnectionHandlerFactory) error {
+	// TODO check name
+	outboundFactories[name] = factory
+	return nil
+}
+
+func GetInboundConnectionHandlerFactory(name string) InboundConnectionHandlerFactory {
+	factory, found := inboundFactories[name]
+	if !found {
+		return nil
+	}
+	return factory
+}
+
+func GetOutboundConnectionHandlerFactory(name string) OutboundConnectionHandlerFactory {
+	factory, found := outboundFactories[name]
+	if !found {
+		return nil
+	}
+	return factory
+}