swoole教程介绍为何从入门到放弃

二、网络通信引擎

学习swoole需要去翻阅文档， swoole文档

1.通过swoole创建一个最简单的tcp服务

tcp服务端（tcp_server.php）

//创建Server对象，监听 127.0.0.1:9501端口
$serv = new swoole_server("127.0.0.1", 9501);

$serv->set([
    'worker_num' => 4, // worker进程数，cpu 1-4倍
    'max_request' => 100,
]);

/**
 * 监听连接进入事件
 * $fd 客户端连接服务端的唯一标识
 * $reactor_id 线程id
 */
$serv->on('connect', function ($serv, $fd, $reactor_id) {
    echo "Client: {$fd} - {$reactor_id} - Connect.\n";
});

//监听数据接收事件
$serv->on('receive', function ($serv, $fd, $reactor_id, $data) {
    $serv->send($fd, "Server: ".$data);
});

//监听连接关闭事件
$serv->on('close', function ($serv, $fd) {
    echo "Client: Close.\n";
});

//启动服务器
$serv->start();

tcp客户端（tcp_client.php）

// 创建tcp客户端
$client = new swoole_client(SWOOLE_SOCK_TCP);

// 连接tcp服务端
if (!$client->connect("127.0.0.1", 9501)) {
    echo '连接失败';
    exit;
}

// php cli
fwrite(STDOUT, '请输入：');
$msg = trim(fgets(STDIN));

// 发送消息给tcp服务端
if (!$client->send($msg)) {
    echo '发送消息失败';
    exit;
}

// 接收
$result = $client->recv();
echo $result;

2.拓展：php的四种回调

• 匿名函数

$server->on('Request', function ($req, $resp) {
    echo "hello world";
});

• 类静态方法

class A
{
    static function test($req, $resp)
    {
        echo "hello world";
    }
}
$server->on('Request', 'A::Test');
$server->on('Request', array('A', 'Test'));

• 函数

function my_onRequest($req, $resp)
{
    echo "hello world";
}
$server->on('Request', 'my_onRequest');

• 对象方法

class A
{
    function test($req, $resp)
    {
        echo "hello world";
    }
}

$object = new A();
$server->on('Request', array($object, 'test'));

小技巧：查看开启的worker进程： ps aft | grep tcp_server.php

3. udp的服务端和客户端可以根据文档自行创建

4. http服务

// 监听所有地址和9501端口
$http = new swoole_http_server('0.0.0.0', 9501);

// 动静分离配置
$http->set([
    // 开启静态请求
    'enable_static_handler' => true,
    // 静态资源目录
    'document_root' => '/opt/app/code1/',
]);

$http->on('request', function ($request, $response) {
    // 获取get请求的参数
    $param = json_encode($request->get);
    // 设置cookie
    $response->cookie('name', 'ronaldo', time() + 1800);
    // 输出到页面
    $response->end("
Hello Swoole - {$param}
");
});

// 开启http服务
$http->start();

5.通过swoole创建websocket服务

websocket服务端（websocket_server.php）

// 监听所有地址和9502端口
$server = new swoole_websocket_server('0.0.0.0', 9502);

// 动静分离配置
$server->set([
    // 开启静态请求
    'enable_static_handler' => true,
    // 静态资源目录
    'document_root' => '/opt/app/swoole/websocket',
]);
$server->on('open', function ($server, $request) {
    echo "server：handshake success with fd - {$request->fd}\n";
});

$server->on('message', function ($server, $frame) {
    echo "receive from {$frame->fd}:{$frame->data},opcode:{$frame->opcode},fin:{$frame->finish}\n";
    $server->push($frame->fd, "this is server");
});

$server->on('close', function ($server, $fd) {
    echo "client - {$fd} - close\n";
});

$server->start();

websocket客户端 （websockt_client.html）

// 创建websocket实例
        var websocketURL = "ws://www.rona1do.top:9502";
        var websocket = new WebSocket(websocketURL);

        // 实例化对象的onopen属性
        websocket.onopen = function (ev) {
            websocket.send("hello-websocket");
            console.log("connect-swoole-success");
        }

        // 实例化对象的onmessage属性，接收服务端返回的数据
        websocket.onmessage = function (ev) {
            console.log("websockect-server-return-data：" + ev.data);
        }

        // close
        websocket.onclose = function (ev) {
            console.log("close");
        }

6. 使用面向对象来优化websocket服务代码

class WebSocket {
    const HOST = '0.0.0.0';
    const PORT = 9502;

    private $ws = null;

    function __construct()
    {
        $this->ws = new swoole_websocket_server(self::HOST, self::PORT);
        $this->ws->on('open', [$this, 'onOpen']);
        $this->ws->on('message', [$this, 'onMessage']);
        $this->ws->on('close', [$this, 'onClose']);
        $this->ws->start();
    }

    // 监听websocket连接事件
    function onOpen($server, $request) {
        echo "server: handshake success with fd{$request->fd}\n";
    }

    // 监听websocket消息接收事件
    function onMessage($server, $frame) {
        echo "receive from {$frame->fd}:{$frame->data},opcode:{$frame->opcode},fin:{$frame->finish}\n";
        $server->push($frame->fd, "this is server");
    }

    // 监听客户端关闭事件
    function onClose($server, $fd) {
        echo "Client：{$fd} closes\n";
    }
}

7.swoole中的task小案例

onTask：在task_worker进程内被调用。worker进程可以使用swoole_server_task函数向task_worker进程投递新的任务。当前的Task进程在调用onTask回调函数时会将进程状态切换为忙碌，这时将不再接收新的Task，当onTask函数返回时会将进程状态切换为空闲然后继续接收新的Task。

onFinish：当worker进程投递的任务在task_worker中完成时，task进程会通过swoole_server->finish()方法将任务处理的结果发送给worker进程。

class Websocket {

    const HOST = '0.0.0.0';
    const PORT = 9502;
    private $ws = null;

    public function __construct()
    {
        $this->ws = new swoole_websocket_server(self::HOST, self::PORT);
        $this->ws->set([
            'worker_num' => 2,
            'task_worker_num' => 2, // 要想使用task必须要指明
        ]);
        $this->ws->on('open', [$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();
    }

    public function onOpen($server, $request)
    {
        echo "server：handshake success with fd：{$request->fd}\n";
    }

    public function onMessage($server, $frame)
    {
        echo "receive from {$frame->fd}:{$frame->data}\n";

        // 需要投递的任务数据
        $data = [
            'fd' => $frame->fd,
            'msg' => 'task',
        ];
        $server->task($data);

        $server->push($frame->fd, 'this is server');
    }

    // 处理投递的任务方法，非阻塞
    public function onTask($server, $task_id, $worker_id, $data)
    {
        print_r($data);
        // 模拟大量数据的操作
        sleep(10);
        return "task_finish";
    }
    
    // 投递任务处理完毕调用的方法
    public function onFinish($server, $task_id, $data)
    {
        echo "task_id:{$task_id}\n";
        echo "task finish success:{$data}\n";
    }
    
    public function onClose($server, $fd)
    {
        echo "Client：close";
    }
}

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