Swoole 之异步毫秒定时器

常规定时器

crontab。但是 crontab 有时候无法满足一些场景，比如需要一些毫秒级、秒级去处理任务的时候。

Swoole 常规定时器

swoole_timer_tick：每隔一段时间去执行

swoole_timer_after：几秒 、几分钟之后去执行

参考： https://wiki.swoole.com/wiki/page/p-timer.html

• 实例

# 新开一个终端 1：
cd /data/project/test/swoole/demo/server
vim ws.php

• 修改 ws.php

<?php

class Ws{

    CONST HOST = "0.0.0.0";
    CONST PORT = 8812;

    public $ws = null;

    public function __construct(){
      
        $this->ws = new swoole_websocket_server("0.0.0.0", 8812);

        $this->ws->set([
            'worker_num' => 2,
            'task_worker_num' => 2
        ]);
        $this->ws->on("open", [$this, 'onOpen']);
        $this->ws->on("message", [$this, 'onMessage']);
        $this->ws->on("task", [$this, 'onTask']);
        $this->ws->on("finish", [$this, 'onFinish']);
        $this->ws->on("close", [$this, 'onClose']);

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

    // 监听 ws 连接事件
    public function onOpen($ws, $request){
        var_dump($request->fd);
        if($request->fd == 1){
            // 每 2 秒执行
            swoole_timer_tick(2000, function($timer_id){
                echo "2s: timerId: {$timer_id}\n";
            });
        }
    }

    // 监听 ws 消息事件
    public function onMessage($ws, $frame){
        echo "server-push-message:{$frame->data}\n";
        $data = [
            'task' => 1,
            'fd'   => $frame->fd
        ];
        // $ws->task($data);
        // 5 秒后执行，异步执行，所以先打印了“server-push:xxx”内容，5 秒后再执行了“server-time-after:xxx”
        // 使用 PHP 闭包
        swoole_timer_after(5000, function() use($ws, $frame){
            echo "5s-after\n";
            $ws->push($frame->fd, "server-time-after:5s");
        });
        $ws->push($frame->fd, "server-push:" . date("Y-m-d H:i:s"));
    }

    public function onTask($serv, $task_id, $workerId, $data){
        print_r($data);
        sleep(10);
        return 'on task finish';

    }

    public function onFinish($serv, $taskId, $data){
        echo "taskId:{$taskId}\n";
        echo "finish-data-success:{$data}\n";

    } 

    // 关闭
    public function onClose($ws, $fd){
        echo "clientId: {$fd} \n";
    }

}

$obj = new Ws();

• 实例操作

# 终端 1 输入如下代码，打开客户端
php ws.php
# 新开一个终端 2，打开 http server
cd /data/project/test/swoole/demo/client
php http_server.php
# 打开浏览器，访问 http://192.168.2.214:8811/ws_client.html