锁定等待超时 Symfony2 Ratchet with PdoSessionHandler

Question

我使用 PdoSessionHandler 将用户的会话存储在数据库中，以便使用会话 Symfony2 服务器和 Ratchet 服务器进行通信。

它连接正常，发送消息正常，但是当我切换到 Symfony2 应用程序中的其他页面或关闭会话时，它会调用 onClose 函数。然后应用程序被阻止并且 returns 出现以下错误：

SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction 500 Internal Server Error - PDOException

服务器看起来像：

$pdo = new PDO('mysql:host=localhost;dbname=XXXX', 'root', null);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$dbOptions = array(
    'db_table' => 'sessions',
    'db_id_col' => 'sess_id',
    'db_data_col' => 'sess_data',
    'db_time_col' => 'sess_time',
    'db_lifetime_col' => 'sess_lifetime',);

$session = new PdoSessionHandler($pdo, $dbOptions);
$myApp = new ServerSocket();

$loop = \React\EventLoop\Factory::create();
$server = new \React\Socket\Server($loop);
$server->listen(8080, '0.0.0.0');

new IoServer(new HttpServer(new WsServer(new SessionProvider($myApp,$session))), $server);
echo "server running \n";
$loop->run();

"MyApp" 看起来像：

class ServerSocket implements MessageComponentInterface {

protected $players;
private $users;

public function __construct()
{
    $this->players = [];
    $this->users = new \SplObjectStorage();
}

function onOpen(ConnectionInterface $conn)
{
    $this->users->attach($conn);
    $this->players[$conn->Session->get('current_user_id')] = $conn;
    print("new conection (". $conn->Session->get('current_user_id').")");
}

function onClose(ConnectionInterface $conn)
{
    $this->users->detach($conn);
    unset($this->players[$conn->Session->get('current_user_id')]);
    $conn->close();
}

   function onMessage(ConnectionInterface $from, $msg)
{
    $data = json_decode($msg);
    $to = $data->command;
    if (isset($this->players[$to])) {
        $this->players[$to]->send($data->message);
        echo $data->message;
    }
 }
}

Twig 页面的脚本是：

 var conn = new WebSocket('ws://localhost:8080');
    conn.onopen = function(e) {
        alert("Connection established!");
    };

    conn.onmessage = function(e) {
        alert(e.data);
    };

    function sendMessage(msg,user) {
        conn.send(JSON.stringify({command: user, message: msg}));
    };


    sendMessage("test",2);

我该怎么做才能避免锁定？

Answer 1

根据Symfony 2 blocked concurrency，禁用会话锁定已经解决了我的问题。

对于你的情况，你应该尝试：

$dbOptions = array(
    'db_table'        => 'sessions',
    'db_id_col'       => 'sess_id',
    'db_data_col'     => 'sess_data',
    'db_time_col'     => 'sess_time',
    'db_lifetime_col' => 'sess_lifetime',
    'lock_mode'       => 0
);

锁定等待超时 Symfony2 Ratchet with PdoSessionHandler

Lock wait timeout Symfony2 Ratchet with PdoSessionHandler

php

symfony

ratchet