实战swoole【聊天室】

前言：了解概念之后就应该练练手啦，不然就是巨婴

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• 代码仓库
• 实战swoole【聊天室】
• 在线体验

准备工作

• 需要先看初识swoole【上】，了解基本的服务端WebSocket使用
• js WebSocket客户端简单使用

使用

# 命令行1
php src/websocket/run.php
# 命令行2
cd public && php -S localhost:8000
# 客户端，多开几个查看效果
访问http://localhost:8000/

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WebSocket

官方示例

$server = new swoole_websocket_server("0.0.0.0", 9501);
$server->on('open', function (swoole_websocket_server $server, $request) {
        echo "server: handshake success with fd{$request->fd}\n";
    });
$server->on('message', function (swoole_websocket_server $server, $frame) {
        echo "receive from {$frame->fd}:{$frame->data},opcode:{$frame->opcode},fin:{$frame->finish}\n";
        $server->push($frame->fd, "this is server");
    });
$server->on('close', function ($ser, $fd) {
        echo "client {$fd} closed\n";
    });
$server->on('request', function (swoole_http_request $request, swoole_http_response $response) {
        global $server;//调用外部的server
        // $server->connections 遍历所有websocket连接用户的fd，给所有用户推送
        foreach ($server->connections as $fd) {
            $server->push($fd, $request->get['message']);
        }
    });
$server->start();
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详解：

• swoole_websocket_server 继承自 swoole_http_server

  • 设置了onRequest回调，websocket服务器也可以同时作为http服务器
  • 未设置onRequest回调，websocket服务器收到http请求后会返回http 400错误页面
  • 如果想通过接收http触发所有websocket的推送，需要注意作用域的问题，面向过程请使用global对swoole_websocket_server进行引用，面向对象可以把swoole_websocket_server设置成一个成员属性

• function onOpen(swoole_websocket_server $svr , swoole_http_request $req );

  • 当WebSocket客户端与服务器建立连接并完成握手后会回调此函数。
  • $req 是一个Http请求对象，包含了客户端发来的握手请求信息
  • onOpen事件函数中可以调用push向客户端发送数据或者调用close关闭连接
  • onOpen事件回调是可选的

• function onMessage(swoole_websocket_server $server , swoole_websocket_frame $frame )

  • 当服务器收到来自客户端的数据帧时会回调此函数。
  • $frame 是swoole_websocket_frame对象，包含了客户端发来的数据帧信息
  • onMessage回调 必须被设置 ，未设置服务器将无法启动
  • 客户端发送的ping帧不会触发onMessage，底层会自动回复pong包

• swoole_websocket_frame 属性

  • $frame->fd ，客户端的socket id，使用 $server->push 推送数据时需要用到
  • $frame->data ，数据内容，可以是文本内容也可以是二进制数据，可以通过opcode的值来判断
  • $frame->opcode ，WebSocket的OpCode类型，可以参考WebSocket协议标准文档
  • $frame->finish ， 表示数据帧是否完整，一个WebSocket请求可能会分成多个数据帧进行发送（底层已经实现了自动合并数据帧，现在不用担心接收到的数据帧不完整）

聊天室服务端示例

目录结构：

• config
  • socket.php
• src
  • websocket
    • Config.php
    • run.php
    • WebSocketServer.php 内存表版本
    • WsRedisServer.php redis版本

WebSocketServer.php 内存表版本

<?php
namespace App\WebSocket;

class WebSocketServer
{
    private $config;
    private $table;
    private $server;

    public function __construct()
    {
        // 内存表 实现进程间共享数据，也可以使用 redis 替代
        $this->createTable();
        // 实例化配置
        $this->config = Config::getInstance();
    }

    public function run()
    {
        $this->server = new \swoole_websocket_server(
            $this->config['socket']['host'],
            $this->config['socket']['port']
        );

        $this->server->on('open', [$this, 'open']);
        $this->server->on('message', [$this, 'message']);
        $this->server->on('close', [$this, 'close']);

        $this->server->start();
    }

    public function open(\swoole_websocket_server $server, \swoole_http_request $request)
    {
        $user = [
            'fd' => $request->fd,
            'name' => $this->config['socket']['name'][array_rand($this->config['socket']['name'])] . $request->fd,
            'avatar' => $this->config['socket']['avatar'][array_rand($this->config['socket']['avatar'])]
        ];
        // 放入内存表
        $this->table->set($request->fd, $user);

        $server->push($request->fd, json_encode(
                array_merge(['user' => $user], ['all' => $this->allUser()], ['type' => 'openSuccess'])
            )
        );
    }

    private function allUser()
    {
        $users = [];
        foreach ($this->table as $row) {
            $users[] = $row;
        }
        return $users;
    }

    public function message(\swoole_websocket_server $server, \swoole_websocket_frame $frame)
    {
        $this->pushMessage($server, $frame->data, 'message', $frame->fd);
    }

    /**
     * 推送消息
     *
     * @param \swoole_websocket_server $server
     * @param string $message
     * @param string $type
     * @param int $fd
     */
    private function pushMessage(\swoole_websocket_server $server, string $message, string $type, int $fd)
    {
        $message = htmlspecialchars($message);
        $datetime = date('Y-m-d H:i:s', time());
        $user = $this->table->get($fd);

        foreach ($this->table as $item) {
            // 自己不用发送
            if ($item['fd'] == $fd) {
                continue;
            }

            $server->push($item['fd'], json_encode([
                'type' => $type,
                'message' => $message,
                'datetime' => $datetime,
                'user' => $user
            ]));
        }
    }

    /**
     * 客户端关闭的时候
     *
     * @param \swoole_websocket_server $server
     * @param int $fd
     */
    public function close(\swoole_websocket_server $server, int $fd)
    {
        $user = $this->table->get($fd);
        $this->pushMessage($server, "{$user['name']}离开聊天室", 'close', $fd);
        $this->table->del($fd);
    }

    /**
     * 创建内存表
     */
    private function createTable()
    {
        $this->table = new \swoole_table(1024);
        $this->table->column('fd', \swoole_table::TYPE_INT);
        $this->table->column('name', \swoole_table::TYPE_STRING, 255);
        $this->table->column('avatar', \swoole_table::TYPE_STRING, 255);
        $this->table->create();
    }
}

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WsRedisServer.php redis版本

<?php
namespace App\WebSocket;

use Predis\Client;

/**
 * 使用redis代替table，并存储历史聊天记录
 *
 * Class WsRedisServer
 * @package App\WebSocket
 */
class WsRedisServer
{
    private $config;
    private $server;
    private $client;
    private $key = "socket:user";

    public function __construct()
    {
        // 实例化配置
        $this->config = Config::getInstance();
        // redis
        $this->initRedis();
        // 初始化，主要是服务端自己关闭不会清空redis
        foreach ($this->allUser() as $item) {
            $this->client->hdel("{$this->key}:{$item['fd']}", ['fd', 'name', 'avatar']);
        }
    }

    public function run()
    {
        $this->server = new \swoole_websocket_server(
            $this->config['socket']['host'],
            $this->config['socket']['port']
        );

        $this->server->on('open', [$this, 'open']);
        $this->server->on('message', [$this, 'message']);
        $this->server->on('close', [$this, 'close']);

        $this->server->start();
    }

    public function open(\swoole_websocket_server $server, \swoole_http_request $request)
    {
        $user = [
            'fd' => $request->fd,
            'name' => $this->config['socket']['name'][array_rand($this->config['socket']['name'])] . $request->fd,
            'avatar' => $this->config['socket']['avatar'][array_rand($this->config['socket']['avatar'])]
        ];
        // 放入redis
        $this->client->hmset("{$this->key}:{$user['fd']}", $user);

        // 给每个人推送，包括自己
        foreach ($this->allUser() as $item) {
            $server->push($item['fd'], json_encode([
                'user' => $user,
                'all' => $this->allUser(),
                'type' => 'openSuccess'
            ]));
        }
    }

    private function allUser()
    {
        $users = [];
        $keys = $this->client->keys("{$this->key}:*");
        // 所有的key
        foreach ($keys as $k => $item) {
            $users[$k]['fd'] = $this->client->hget($item, 'fd');
            $users[$k]['name'] = $this->client->hget($item, 'name');
            $users[$k]['avatar'] = $this->client->hget($item, 'avatar');
        }
        return $users;
    }

    public function message(\swoole_websocket_server $server, \swoole_websocket_frame $frame)
    {
        $this->pushMessage($server, $frame->data, 'message', $frame->fd);
    }

    /**
     * 推送消息
     *
     * @param \swoole_websocket_server $server
     * @param string $message
     * @param string $type
     * @param int $fd
     */
    private function pushMessage(\swoole_websocket_server $server, string $message, string $type, int $fd)
    {
        $message = htmlspecialchars($message);
        $datetime = date('Y-m-d H:i:s', time());
        $user['fd'] = $this->client->hget("{$this->key}:{$fd}", 'fd');
        $user['name'] = $this->client->hget("{$this->key}:{$fd}", 'name');
        $user['avatar'] = $this->client->hget("{$this->key}:{$fd}", 'avatar');

        foreach ($this->allUser() as $item) {
            // 自己不用发送
            if ($item['fd'] == $fd) {
                continue;
            }

            $is_push = $server->push($item['fd'], json_encode([
                'type' => $type,
                'message' => $message,
                'datetime' => $datetime,
                'user' => $user
            ]));
            // 删除失败的推送
            if (!$is_push) {
                $this->client->hdel("{$this->key}:{$item['fd']}", ['fd', 'name', 'avatar']);
            }
        }
    }

    /**
     * 客户端关闭的时候
     *
     * @param \swoole_websocket_server $server
     * @param int $fd
     */
    public function close(\swoole_websocket_server $server, int $fd)
    {
        $user['fd'] = $this->client->hget("{$this->key}:{$fd}", 'fd');
        $user['name'] = $this->client->hget("{$this->key}:{$fd}", 'name');
        $user['avatar'] = $this->client->hget("{$this->key}:{$fd}", 'avatar');
        $this->pushMessage($server, "{$user['name']}离开聊天室", 'close', $fd);
        $this->client->hdel("{$this->key}:{$fd}", ['fd', 'name', 'avatar']);
    }

    /**
     * 初始化redis
     */
    private function initRedis()
    {
        $this->client = new Client([
            'scheme' => $this->config['socket']['redis']['scheme'],
            'host' => $this->config['socket']['redis']['host'],
            'port' => $this->config['socket']['redis']['port'],
        ]);
    }
}
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config.php

<?php
namespace App\WebSocket;

class Config implements \ArrayAccess
{
    private $path;
    private $config;
    private static $instance;

    public function __construct()
    {
        $this->path = __DIR__ . '/../../config/';
    }

    // 单例模式
    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function offsetSet($offset, $value)
    {
        // 阉割
    }

    public function offsetGet($offset)
    {
        if (empty($this->config)) {
            $this->config[$offset] = require $this->path . $offset . ".php";
        }
        return $this->config[$offset];
    }

    public function offsetExists($offset)
    {
        return isset($this->config[$offset]);
    }

    public function offsetUnset($offset)
    {
        // 阉割
    }

    // 禁止克隆
    final private function __clone(){}
}
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config/socket.php

<?php
return [
    'host' => '0.0.0.0',
    'port' => 9501,

    'redis' => [
        'scheme' => 'tcp',
        'host' => '0.0.0.0',
        'port' => 6380
    ],

    'avatar' => [
        './images/avatar/1.jpg',
        './images/avatar/2.jpg',
        './images/avatar/3.jpg',
        './images/avatar/4.jpg',
        './images/avatar/5.jpg',
        './images/avatar/6.jpg'
    ],

    'name' => [
        '科比',
        '库里',
        'KD',
        'KG',
        '乔丹',
        '邓肯',
        '格林',
        '汤普森',
        '伊戈达拉',
        '麦迪',
        '艾弗森',
        '卡哇伊',
        '保罗'
    ]
];
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run.php

<?php
require __DIR__ . '/../bootstrap.php';

$server = new App\WebSocket\WebSocketServer();

$server->run();
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总结

完整示例： 聊天室

学完后发现生活中所谓的聊天室其实也不过如此，当然这只是简单的demo，很多功能都没有实现，想进一步学习的话可以去github上找完整的项目进行深入学习

参考

• swoole
• PHP + Swoole 实现的简单聊天室