Laravel + Swoole 打造IM简易聊天室

最近在学习Swoole,利用Swoole扩展让PHP生动了不少，本篇就来Swoole开发一款简易的IM聊天室

应用场景：实现简单的即时消息聊天室.

(一)扩展安装

pecl install swoole

安装完成后可以通过以下命令检测Swoole是否安装成功

php -m | grep swoole

(二)webSocket服务端代码

我们需要通过Laravel Command来实现,因为Swoole只能运行在PHP CLI模式下.

1.生成Command类

php artisan make:command SwooleServer

2.编写webSocket Server逻辑

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;

class SwooleServer extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'swoole:server';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'swoole websocket';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
        //创建server
        $server = new \Swoole\WebSocket\Server("0.0.0.0", 9502);
        
        //连接成功回调
        $server->on('open', function (\Swoole\WebSocket\Server $server, $request) {
            $this->info($request->fd . '链接成功');
        });

        //收到消息回调
        $server->on('message', function (\Swoole\WebSocket\Server $server, $frame) {
            $content = $frame->data;

            //推送给所有链接
            foreach ($server->connections as $fd){
                $server->push($fd,$content);
            }
        });

        //关闭链接回调
        $server->on('close', function ($ser, $fd) {
            $this->info($fd . '断开链接');
        });

        $server->start();
    }
}

3.运行服务端

php artisan swoole:server

(三)客户端实现

1.HTML+JS代码实现

<div style="width:600px;margin:0 auto;border:1px solid #ccc;">
    <div id="content" style="overflow-y:auto;height:300px;"></div>
    <hr />
    <div style="height:40px;background:white;">
        <input type="text" class="form-control" id="message"  placeholder="请输入内容">
        <button type="button" class="btn btn-primary" onclick="sendMessage()">Primary</button>
    </div>
</div>

<script type="text/javascript">
    if(window.WebSocket){
          // 端口和ip地址对应不要写错
          var webSocket = new WebSocket("ws://127.0.0.1:9502");
          webSocket.onopen = function (event) {
              console.log('webSocket 链接成功');
          };
          
          //收到服务端消息回调
          webSocket.onmessage = function (event) {
            var content = document.getElementById('content');
            content.innerHTML = content.innerHTML.concat('<p style="margin-left:20px;height:20px;line-height:20px;">'+event.data+'</p>');
          }
          
          var sendMessage = function(){
              var data = document.getElementById('message').value;
              webSocket.send(data);
          }
      }else{
          console.log("您的浏览器不支持WebSocket");
      }
</script>

通过以上的代码便完善一个基本的简易聊天室,但是距离一个真正完善的及时通讯系统构建还相差甚远,具体的理解和应用都写在了代码注释中,如有不能理解的地方,可以去查看Swoole官方文档以及Webscoket Api.

附上聊天室演示图:

聊天室演示