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im-system's Introduction

Server-整体结构

架构图

Feature

  • 用户上线广播
  • 用户消息广播
  • 私聊
  • 在线用户查询
  • 修改当前用户名
  • 超时强踢
  • 简易的Client

Reference

Aceld: 8小时转职Golang工程师

Note:

  • Read方法返回EOF错误

    表示本端感知到对端已经正常关闭(调用Close)conn连接（本端已接收到对端发送的FIN）。此后如果本端不调用Close方法，则连接处于非完全关闭状态（CLOSE_WAIT）。即文件描述符发生泄漏。

  • Read方法返回0

    1. 情况一：本端已关闭连接对端的conn(A)，此时本端若Read刚才关闭的conn(A)，则返回0，error：use of closed network connection
    2. 情况二：对端主机强制关闭conn(如CTRL+C),此时本端Read该conn时返回0，error：An existing connection was forcibly closed by the remote host

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