Swoole을 사용하여 고성능 HTTP 로드 밸런싱 서버를 구현하는 방법

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

$http->on("start", function ($server) {
    echo "Swoole http server is started at http://0.0.0.0:9501
";
});

$http->on("request", function ($request, $response) {
    $response->header("Content-Type", "text/plain");
    $response->end("Hello World
");
});

$http->start();

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

$http->on("workerStart", function ($server, $worker_id) {
    if ($worker_id == 0) {
        $server->addServer("0.0.0.0", 9502, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);
        $server->addServer("0.0.0.0", 9503, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);
        $server->addServer("0.0.0.0", 9504, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);
    }
});

$http->on("request", function ($request, $response) {
    $response->header("Content-Type", "text/plain");
    $response->end("Hello World
");
});

$http->start();

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

$servers = [
    ["host" => "127.0.0.1", "port" => 9502],
    ["host" => "127.0.0.1", "port" => 9503],
    ["host" => "127.0.0.1", "port" => 9504],
];

$current = 0;

$http->on("workerStart", function ($server, $worker_id) use ($servers, &$current) {
    if ($worker_id == 0) {
        foreach ($servers as $server) {
            $server_id = $server["host"] . ":" . $server["port"];
            $server = $server["host"];
            $port = $server["port"];
            $server = $server->addserver($server, $port, SWOOLE_PROCESS, SWOOLE_SOCK_TCP);
            $server->set(array(
                'open_length_check' => true,
                'package_max_length' => 81920,
                'package_length_type' => 'N',
                'package_body_offset' => 16,
                'package_length_offset' => 0,
            ));
            $server->on('receive', function ($server, $fd, $reactor_id, $data) use ($server_id) {
                echo "Receive data from $server_id: $data
";
                $server->send($fd, "Hello, I'm $server_id
");
            });
        }
    }
});

$http->on("request", function ($request, $response) use ($servers, &$current) {
    $server = $servers[$current];
    $host = $server["host"];
    $port = $server["port"];
    $current = ($current + 1) % count($servers);
    $client = new SwooleClient(SWOOLE_TCP);
    $client->connect($host, $port, 0.5);
    $client->send($request->rawcontent());
    $response->end($client->recv());
});

$http->start();

curl -v "http://127.0.0.1:9501/"