go 及时通信-用户业务封装

package main

import "net"

//构件用户对象
type User struct {
	Name string
	Addr string
	C    chan string
	Conn net.Conn

	Server *Server
}

//用户API
func NewUser(conn net.Conn, server *Server) *User {
	//用户地址
	userAddr := conn.RemoteAddr().String()

	user := &User{
		Name:   userAddr,
		Addr:   userAddr,
		C:      make(chan string),
		Conn:   conn,
		Server: server,
	}

	//启动go程
	go user.ListMessage()

	return user
}

//监听channel信息
func (this *User) ListMessage() {
	for {
		msg := <-this.C

		this.Conn.Write([]byte(msg + "\n"))
	}
}

//上线业务
func (this *User) OnLine() {
	//用户上线
	this.Server.MapLock.Lock()
	this.Server.OnlineMap[this.Addr] = this
	this.Server.MapLock.Unlock()

	//发送消息
	this.Server.BroadCast(this, "shangxianle")
}

//下线业务
func (this *User) OffLine() {

	this.Server.MapLock.Lock()
	delete(this.Server.OnlineMap, this.Addr)
	this.Server.MapLock.Unlock()
	//用户下线
	this.Server.BroadCast(this, "xianxianle")
}

//消息业务
func (this *User) DoMessage(msg string) {
	this.Server.BroadCast(this, msg)
}

　　

package main

import (
	"fmt"
	"io"
	"net"
	"sync"
)

//构件server
type Server struct {
	Ip   string
	Port int

	//在线用户列表
	OnlineMap map[string]*User
	MapLock   sync.RWMutex
	//消息
	Message chan string
}

//提供一个对外的接口
func NewServer(ip string, port int) *Server {

	server := &Server{
		Ip:   ip,
		Port: port,

		OnlineMap: make(map[string]*User),
		Message:   make(chan string),
	}

	return server
}

//发送消息
func (this *Server) BroadCast(user *User, msg string) {
	sendMsg := "[" + user.Addr + "]" + ":" + msg

	this.Message <- sendMsg
}

func (this *Server) Handler(conn net.Conn) {
	// fmt.Println("链接成功")

	user := NewUser(conn, this)

	//用户上线
	user.OnLine()

	//接收客户端消息并发送
	go func() {
		buf := make([]byte, 5000)

		for {
			//读取输入
			n, err := conn.Read(buf)
			if n == 0 {
				//用户下线
				user.OffLine()
				return
			}
			if err != nil && err != io.EOF {
				fmt.Println("conn read err:", err)
				return
			}

			msg := string(buf[:n-1])

			//用户针对消息处理
			user.DoMessage(msg)
		}

	}()

	//阻塞
	select {}
}

//监听channel
func (this *Server) ListMessager() {
	for {
		msg := <-this.Message
		//发送每个用户channel
		this.MapLock.Lock()
		for _, cli := range this.OnlineMap {
			cli.C <- msg
		}
		this.MapLock.Unlock()
	}
}

//启动
func (this *Server) start() {

	//监听客户端
	listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", this.Ip, this.Port))
	if err != nil {
		fmt.Println("listener err:", err)
		return
	}

	//关闭
	defer listener.Close()

	go this.ListMessager()

	for {
		//连接
		conn, err := listener.Accept()
		if err != nil {
			fmt.Println("conn err:", err)
			continue
		}

		//启动go handler操作
		go this.Handler(conn)
	}
}