swoole服务

1、TCP服务器

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

//监听连接进入事件
$serv->on('Connect', function ($serv, $fd) {  
    echo "Client: Connect.
";
});

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

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

//启动服务器
$serv->start();

- 通过监听端口来启动服务，通过监听事件来响应不同的逻辑（回调指定函数）。

- 服务器可以同时被成千上万个客户端连接，$fd 就是客户端连接的唯一标识符。

- swoole提供了异步处理功能，可以投递一个异步任务到 TaskWorker 进程池中执行，不影响当前请求的处理速度。

$serv = new SwooleServer("127.0.0.1", 9501);

//设置异步任务的工作进程数量
$serv->set(array('task_worker_num' => 4));

//此回调函数在worker进程中执行
$serv->on('receive', function($serv, $fd, $from_id, $data) {
    //投递异步任务
    $task_id = $serv->task($data);
    echo "Dispatch AsyncTask: id=$task_id
";
});

//处理异步任务(此回调函数在task进程中执行)
$serv->on('task', function ($serv, $task_id, $from_id, $data) {
    echo "New AsyncTask[id=$task_id]".PHP_EOL;
    //返回任务执行的结果
    $serv->finish("$data -> OK");
});

//处理异步任务的结果(此回调函数在worker进程中执行)
$serv->on('finish', function ($serv, $task_id, $data) {
    echo "AsyncTask[$task_id] Finish: $data".PHP_EOL;
});

$serv->start();

2、UDP服务器

//创建Server对象，监听 127.0.0.1:9502端口，类型为SWOOLE_SOCK_UDP
$serv = new SwooleServer("127.0.0.1", 9502, SWOOLE_PROCESS, SWOOLE_SOCK_UDP); 

//监听数据接收事件
$serv->on('Packet', function ($serv, $data, $clientInfo) {
    $serv->sendto($clientInfo['address'], $clientInfo['port'], "Server ".$data);
    var_dump($clientInfo);
});

//启动服务器
$serv->start();

- UDP没有连接的概念，客户端无需connect，直接向监听端口发送数据包。

3、http服务器

$http = new SwooleHttpServer("0.0.0.0", 9501);

$http->on('request', function ($request, $response) {
    var_dump($request->get, $request->post);
    $response->header("Content-Type", "text/html; charset=utf-8");
    $response->end("<h1>Hello Swoole. #".rand(1000, 9999)."</h1>");
});

$http->start();

- HTTP 服务器只需要关注请求响应即可，所以只需要监听一个 onRequest 事件。

4、webSocket服务器

//创建websocket服务器对象，监听0.0.0.0:9502端口
$ws = new SwooleWebSocketServer("0.0.0.0", 9502);

//监听WebSocket连接打开事件
$ws->on('open', function ($ws, $request) {
    var_dump($request->fd, $request->get, $request->server);
    $ws->push($request->fd, "hello, welcome
");
});

//监听WebSocket消息事件
$ws->on('message', function ($ws, $frame) {
    echo "Message: {$frame->data}
";
    $ws->push($frame->fd, "server: {$frame->data}");
});

//监听WebSocket连接关闭事件
$ws->on('close', function ($ws, $fd) {
    echo "client-{$fd} is closed
";
});

$ws->start();

5、MQTT服务器

<?php
function decodeValue($data)
{
    return 256 * ord($data[0]) + ord($data[1]);
}

function decodeString($data)
{
    $length = decodeValue($data);
    return substr($data, 2, $length);
}

function mqttGetHeader($data)
{
    $byte = ord($data[0]);

    $header['type'] = ($byte & 0xF0) >> 4;
    $header['dup'] = ($byte & 0x08) >> 3;
    $header['qos'] = ($byte & 0x06) >> 1;
    $header['retain'] = $byte & 0x01;

    return $header;
}

function eventConnect($header, $data)
{
    $connect_info['protocol_name'] = decodeString($data);
    $offset = strlen($connect_info['protocol_name']) + 2;

    $connect_info['version'] = ord(substr($data, $offset, 1));
    $offset += 1;

    $byte = ord($data[$offset]);
    $connect_info['willRetain'] = ($byte & 0x20 == 0x20);
    $connect_info['willQos'] = ($byte & 0x18 >> 3);
    $connect_info['willFlag'] = ($byte & 0x04 == 0x04);
    $connect_info['cleanStart'] = ($byte & 0x02 == 0x02);
    $offset += 1;

    $connect_info['keepalive'] = decodeValue(substr($data, $offset, 2));
    $offset += 2;
    $connect_info['clientId'] = decodeString(substr($data, $offset));
    return $connect_info;
}

$server = new SwooleServer("127.0.0.1", 9501, SWOOLE_BASE);

$server->set([
    'open_mqtt_protocol' => 1, // 启用 mqtt 协议
    'worker_num' => 1,
]);

$server->on('connect', function ($server, $fd) {
    echo "Client:Connect.
";
});

$server->on('receive', function ($server, $fd, $from_id, $data) {
    $header = mqttGetHeader($data);
    var_dump($header);

    if ($header['type'] == 1) {
        $resp = chr(32) . chr(2) . chr(0) . chr(0);
        eventConnect($header, substr($data, 2));
        $server->send($fd, $resp);
    } elseif ($header['type'] == 3) {
        $offset = 2;
        $topic = decodeString(substr($data, $offset));
        $offset += strlen($topic) + 2;
        $msg = substr($data, $offset);
        echo "client msg: $topic
----------
$msg
";
        //file_put_contents(__DIR__.'/data.log', $data);
    }
    echo "received length=" . strlen($data) . "
";
});

$server->on('close', function ($server, $fd) {
    echo "Client: Close.
";
});

$server->start();