TCP 异步建立一个到实际mysql服务器的连接

<?php

use Workerman\Worker;
use Workerman\Connection\AsyncTcpConnection;
require_once './Workerman/Autoloader.php';

// 创建一个Worker监听2345端口，使用http协议通讯
$tcp_worker = new Worker("tcp://0.0.0.0:2345");

// 启动4个进程对外提供服务
$tcp_worker->count = 4;

$tcp_worker->onConnect = function ($connection) {
    echo 'new connection '.$connection->getRemoteIp().PHP_EOL;

    // 异步建立一个到实际mysql服务器的连接
    $connection_to_mysql = new AsyncTcpConnection('tcp://172.17.0.3:3306');

    // mysql连接发来数据时，转发给对应客户端的连接
    $connection_to_mysql->onMessage = function ($connection_to_mysql, $data) use ($connection) {
        $connection->send($data);
    };
    // mysql连接关闭时，关闭对应的代理到客户端的连接
    $connection_to_mysql->onClose = function($connection_to_mysql) use ($connection) {
        $connection->close();
    };

    // 执行异步连接
    $connection_to_mysql->connect();

    // 客户端发来数据时，转发给对应的mysql连接
    $connection->onMessage = function($connection, $data) use ($connection_to_mysql) {
          $connection_to_mysql->send($data);
    };
    // 客户端连接断开时，断开对应的mysql连接
    $connection->onClose = function($connection) use ($connection_to_mysql) {
        $connection_to_mysql->close();
    };
};

// 接收到浏览器发送的数据时回复hello world给浏览器
$tcp_worker->onMessage = function($connection, $data)
{
    // 向浏览器发送hello world
    // $connection->send('hello world');
    // $connection->close();
    echo $data;
};

// 运行worker
Worker::runAll();