优化服务退出流程，增加中间件文档

server/internal/library/network/tcp/client.go

@@ -195,7 +195,9 @@ func (client *Client) connect() {
 reconnect:
 	conn := client.dial()
 	if conn == nil {
-		client.Logger.Debugf(client.Ctx, "client dial failed")
+		if !client.stopFlag {
+			client.Logger.Debugf(client.Ctx, "client dial failed")
+		}
 		return
 	}
 
@@ -311,6 +313,11 @@ func (client *Client) Stop() {
 	client.Close()
 }
 
+// IsStop 是否已停止
+func (client *Client) IsStop() bool {
+	return client.stopFlag
+}
+
 // Destroy 销毁当前连接
 func (client *Client) Destroy() {
 	client.stopCron()

server/internal/library/network/tcp/server.go

@@ -294,6 +294,11 @@ func (server *Server) Close() {
 	server.wgLn.Wait()
 }
 
+// IsClose 服务是否关闭
+func (server *Server) IsClose() bool {
+	return server.closeFlag
+}
+
 // Write 向指定客户端发送消息
 func (server *Server) Write(conn *gtcp.Conn, data interface{}) (err error) {
 	if server.closeFlag {