websocket

websocket基本介绍

1. WebSocket是一种在单个TCP连接上进行全双工通信的协议
2. WebSocket使得客户端和服务器之间的数据交换变得更加简单，允许服务端主动向客户端推送数据
3. 在WebSocket API中，浏览器和服务器只需要完成一次握手，两者之间就直接可以创建持久性的连接，并进行双向数据传输

包下载

gorilla的websocket

go get  -u -v github.com/gorilla/websocket

非常方便集成gin的websocket

go get github.com/gobwas/ws

gorilla下的websocket

gin框架的websocket

html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta http-equiv="content-type" content="text/html;charset=utf-8">
    <style>
        p {
            text-align: left;
            padding-left: 20px;
        }
    </style>
</head>
<body>
<div style="width: 800px;height: 600px;margin: 30px auto;text-align: center">
    <h1>www.5lmh.comy演示聊天室</h1>
    <div style="width: 800px;border: 1px solid gray;height: 300px;">
        <div style="width: 200px;height: 300px;float: left;text-align: left;">
            <p><span>当前在线:</span><span id="user_num">0</span></p>
            <div id="user_list" style="overflow: auto;">
            </div>
        </div>
        <div id="msg_list" style="width: 598px;border:  1px solid gray; height: 300px;overflow: scroll;float: left;">
        </div>
    </div>
    <br>
    <textarea id="msg_box" rows="6" cols="50" onkeydown="confirm(event)"></textarea><br>
    <input type="button" value="发送" onclick="send()">
</div>
</body>
</html>
<script type="text/javascript">
    var uname = prompt('请输入用户名', 'user' + uuid(8, 16));
    var ws = new WebSocket("ws://127.0.0.1:8080/v1/chat/ws");
    ws.onopen = function () {
        var data = "系统消息：建立连接成功";
        listMsg(data);
    };
    ws.onmessage = function (e) {
        var msg = JSON.parse(e.data);
        var sender, user_name, name_list, change_type;
        switch (msg.type) {
            case 'system':
                sender = '系统消息: ';
                break;
            case 'user':
                sender = msg.from + ': ';
                break;
            case 'handshake':
                var user_info = {'type': 'login', 'content': uname};
                sendMsg(user_info);
                return;
            case 'login':
            case 'logout':
                user_name = msg.content;
                name_list = msg.user_list;
                change_type = msg.type;
                dealUser(user_name, change_type, name_list);
                return;
        }
        var data = sender + msg.content;
        listMsg(data);
    };
    ws.onerror = function () {
        var data = "系统消息 : 出错了,请退出重试.";
        listMsg(data);
    };
    function confirm(event) {
        var key_num = event.keyCode;
        if (13 == key_num) {
            send();
        } else {
            return false;
        }
    }
    function send() {
        var msg_box = document.getElementById("msg_box");
        var content = msg_box.value;
        var reg = new RegExp("\r\n", "g");
        content = content.replace(reg, "");
        var msg = {'content': content.trim(), 'type': 'user'};
        sendMsg(msg);
        msg_box.value = '';
    }
    function listMsg(data) {
        var msg_list = document.getElementById("msg_list");
        var msg = document.createElement("p");
        msg.innerHTML = data;
        msg_list.appendChild(msg);
        msg_list.scrollTop = msg_list.scrollHeight;
    }
    function dealUser(user_name, type, name_list) {
        var user_list = document.getElementById("user_list");
        var user_num = document.getElementById("user_num");
        while(user_list.hasChildNodes()) {
            user_list.removeChild(user_list.firstChild);
        }
        for (var index in name_list) {
            var user = document.createElement("p");
            user.innerHTML = name_list[index];
            user_list.appendChild(user);
        }
        user_num.innerHTML = name_list.length;
        user_list.scrollTop = user_list.scrollHeight;
        var change = type == 'login' ? '上线' : '下线';
        var data = '系统消息: ' + user_name + ' 已' + change;
        listMsg(data);
    }
    function sendMsg(msg) {
        var data = JSON.stringify(msg);
        ws.send(data);
    }
    function uuid(len, radix) {
        var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
        var uuid = [], i;
        radix = radix || chars.length;
        if (len) {
            for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
        } else {
            var r;
            uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
            uuid[14] = '4';
            for (i = 0; i < 36; i++) {
                if (!uuid[i]) {
                    r = 0 | Math.random() * 16;
                    uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
                }
            }
        }
        return uuid.join('');
    }
</script>

路由

routers.go

// 路由
e.GET("/ws", handler.WebSocketHandler)

handler

handler.go

package handler

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/gobwas/ws"
	"github.com/gobwas/ws/wsutil"
	"log"
)

func WebSocketHandler(c *gin.Context)  {
	conn,read,_,err := ws.UpgradeHTTP(c.Request,c.Writer)
	if read != nil{
		fmt.Println("连接成功",conn.LocalAddr().String(),conn.LocalAddr().Network(),conn.RemoteAddr().String())
	}
	if err != nil{
		log.Panicln("连接失败",err)
	}
	for {
		defer conn.Close()
		msg,op,err := wsutil.ReadClientData(conn)
		if err != nil{
			log.Panicln("读数据失败",err)
		}
		fmt.Println("服务端接收到的消息为:",string(msg))
		err = wsutil.WriteServerMessage(conn,op,msg)
		if err != nil{
			log.Panicln("写数据错误")
		}
	}
}

func RoomHandler(c *gin.Context)  {
	c.HTML(200,"room_index.html",gin.H{})
}

常用方法

// 默认的读写缓冲区为 4096byte
conn,_,_,err := ws.UpgradeHTTP(c.Request,c.Writer)
conn.LocalAddr().String()    // 服务端的ip和端口
conn.LocalAddr().Network()   // 服务端的协议名
conn.RemoteAddr().String()   // 客户端的ip和端口
conn.RemoteAddr().Network()  // 客户端的协议名
posted @ 2023-06-13 17:31  河图s  阅读(18)  评论(0)    收藏  举报