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README
Apache-2.0

TCP Gateway

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介绍

物联网设备网关技术架构设计(Session 管理、心跳管理、数据上行、数据下行)

说明

NioEventLoop 是 Netty 的 Reactor 线程,其角色:

  1. Boss Group:作为服务端 Acceptor 线程,用于 accept 客户端链接,并转发给 WorkerGroup 中的线程。
  2. Worker Group:作为 IO 线程,负责 IO 的读写,从 SocketChannel 中读取报文或向 SocketChannel 写入报文。
  3. Task Queue/Delay Task Queue:作为定时任务线程,执行定时任务,例如链路空闲检测和发送心跳消息等。
概要说明
  • TcpServer :提供TCP连接服务
  • TcpSessionManager: 你可以添加监听事件,用于监听TCP会话创建、销毁等
  • LogSessionListener:一个日志监听器,它和tcpSessionManager关联,监听器必须事先 SessionListener
  • TcpSender:TCP发送者,用户向客户端发送消息通知、实现下行逻辑
  • ServerConfig: TCP 的配置管理类
  • TcpConnector: TCP 容器,用于管理服务和客户端的连接
  • NotifyProxy: 发送通知到代理类

以上都是默认配置,你可以不修改,但是你可能需要换个TCP端口

.TCP网关的网络结构

基于Netty构建TCP网关的长连接容器,作为网关接入层提供服务API请求调用。

客户端通过域名+端口访问TCP网关,域名不同的运营商对应不同的VIP,VIP发布在LVS上,LVS将请求转发给后端的HAProxy,再由HAProxy把请求转发给后端的Netty的IP+Port。

LVS转发给后端的HAProxy,请求经过LVS,但是响应是HAProxy直接反馈给客户端的,这也就是LVS的DR模式。 输入图片说明

TCP网关执行时序图

输入图片说明

其中步骤一至步骤九是 Netty 服务端的创建时序,步骤十至步骤十三是 TCP 网关容器创建的时序。

  • 步骤一:创建 ServerBootstrap 实例,ServerBootstrap 是 Netty 服务端的启动辅助类。
  • 步骤二:设置并绑定 Reactor 线程池,EventLoopGroup 是 Netty 的 Reactor 线程池,EventLoop 负责所有注册到本线程的 Channel。
  • 步骤三:设置并绑定服务器 Channel,Netty Server 需要创建 NioServerSocketChannel 对象。
  • 步骤四:TCP 链接建立时创建 ChannelPipeline,ChannelPipeline 本质上是一个负责和执行 ChannelHandler 的职责链。
  • 步骤五:添加并设置 ChannelHandler,ChannelHandler 串行的加入 ChannelPipeline 中。
  • 步骤六:绑定监听端口并启动服务端,将 NioServerSocketChannel 注册到 Selector 上。
  • 步骤七:Selector 轮训,由 EventLoop 负责调度和执行 Selector 轮询操作。
  • 步骤八:执行网络请求事件通知,轮询准备就绪的 Channel,由 EventLoop 执行 ChannelPipeline。
  • 步骤九:执行 Netty 系统和业务 ChannelHandler,依次调度并执行 ChannelPipeline 的 ChannelHandler。
  • 步骤十:通过 Proxy 代理调用后端服务,ChannelRead 事件后,通过发射调度后端 Service。
  • 步骤十一:创建 Session,Session 与 Connection 是相互依赖关系。
  • 步骤十二:创建 Connection,Connection 保存 ChannelHandlerContext。
  • 步骤十三:添加 SessionListener,SessionListener 监听 SessionCreate 和 SessionDestory 等事件。

程序运行案例步骤

输入图片说明

1.配置本地Host

Window 地址 // C:\Windows\System32\drivers\etc\hosts

添加 127.0.0.1 iot-open.icloud.com

2.启动Server

位置: com.ibyte.iot.test.server.TestTcpServer

2.启动Client

位置: com.ibyte.iot.test.client.TcpClient

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简介

通过在云端进行智能边缘核心设备的建立、身份制定、策略规则制定、函数编写,然后生成配置文件下发;物联网设备网关技术架构设计(Session 管理、心跳管理、数据上行、数据下行) 展开 收起
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