add debug log

Signed-off-by: Benjamin Wang <benjamin.ahrtr@gmail.com>

client/pkg/transport/listener.go

@@ -70,7 +70,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 		// timeout listener with socket options.
 		ln, err := newKeepAliveListener(&lnOpts.ListenConfig, addr)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("case: lnOpts.IsTimeout(), lnOpts.IsSocketOpts(): %w", err)
 		}
 		lnOpts.Listener = &rwTimeoutListener{
 			Listener:     ln,
@@ -80,7 +80,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 	case lnOpts.IsTimeout():
 		ln, err := newKeepAliveListener(nil, addr)
 		if err != nil {
-			return nil, err
+			return nil, fmt.Errorf("case: lnOpts.IsTimeout(): %w", err)
 		}
 		lnOpts.Listener = &rwTimeoutListener{
 			Listener:     ln,
@@ -90,6 +90,7 @@ func newListener(addr, scheme string, opts ...ListenerOption) (net.Listener, err
 	default:
 		ln, err := newKeepAliveListener(nil, addr)
 		if err != nil {
+			return nil, fmt.Errorf("case: default: %w", err)
 			return nil, err
 		}
 		lnOpts.Listener = ln

server/embed/etcd.go

@@ -534,6 +534,7 @@ func configurePeerListeners(cfg *Config) (peers []*peerListener, err error) {
 			transport.WithTimeout(rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout),
 		)
 		if err != nil {
+			cfg.logger.Error("########## transport.NewListenerWithOpts failed", zap.Error(err))
 			return nil, err
 		}
 		// once serve, overwrite with 'http.Server.Shutdown'