Add String method to all interfaces

transport/http_transport.go

@@ -308,6 +308,10 @@ func (h *httpTransport) Listen(addr string) (Listener, error) {
 	}, nil
 }
 
+func (h *httpTransport) String() string {
+	return "http"
+}
+
 func newHttpTransport(addrs []string, opt ...Option) *httpTransport {
 	return &httpTransport{}
 }

transport/transport.go

@@ -26,6 +26,7 @@ type Listener interface {
 type Transport interface {
 	Dial(addr string, opts ...DialOption) (Client, error)
 	Listen(addr string) (Listener, error)
+	String() string
 }
 
 type options struct{}
@@ -59,3 +60,7 @@ func Dial(addr string, opts ...DialOption) (Client, error) {
 func Listen(addr string) (Listener, error) {
 	return DefaultTransport.Listen(addr)
 }
+
+func String() string {
+	return DefaultTransport.String()
+}