Add etcd as a service discovery mechanism

internal/msggateway/n_ws_server.go

@@ -211,12 +211,11 @@ func (ws *WsServer) sendUserOnlineInfoToOtherNode(ctx context.Context, client *C
 
 	// Online push user online message to other node
 	for _, v := range conns {
-		v := v // safe closure var
+		log.ZDebug(ctx, " sendUserOnlineInfoToOtherNode conn ", "target", v.Target())
 		if v.Target() == ws.disCov.GetSelfConnTarget() {
 			log.ZDebug(ctx, "Filter out this node", "node", v.Target())
 			continue
 		}
-		log.ZDebug(ctx, " sendUserOnlineInfoToOtherNode conn ", "target", v.Target(), v.GetState())
 
 		wg.Go(func() error {
 			msgClient := msggateway.NewMsgGatewayClient(v)