Symfony4: Gos Websocket Error: MySQL server has gone away

Question

我已经为 GOS:WebSocketBundle 启用了 PDO Periodic Pings，我仍然不时收到此错误：

 09:41:28 ERROR [websocket] Connection error occurred Warning: Error
 while sending QUERY packet. PID=30536 in /home/dev.symfony/libs/composer_vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php
 10:00:23 ERROR     [websocket] Connection error occurred
 SQLSTATE[HY000]: General error: 2006 MySQL server has gone away in
 /home/dev.symfony/libs/composer_vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php
 line 107 ["connection_id" => 3365,"session_id" =>
 "11667050395acf121709d30728596936"] []

还有一点就是，如果没有人使用开发服务器，在日志中没有错误，但是如果我立即登录就会出现这个错误。

github https://github.com/GeniusesOfSymfony/WebSocketBundle/issues/299 上也已打开问题但没有答案，所以我也在这里问。谢谢。

Answer 1

已解决。问题是我在 "onSubscribe" 函数内的 Topic 内定义了周期性计时器，例如：

public function onSubscribe(ConnectionInterface $connection, Topic $topic, WampRequest $request)
    {
...
        $topicTimer = $connection->PeriodicTimer;

        //Add periodic timer every 3 seconds update
        $topicTimer->addPeriodicTimer('notifications', 3, function() use ($topic, $connection) {
            $user = $this->clientManipulator->getClient($connection);
            if($user) {
                $counters = $this->globalVariables->getCounters($user);
                $connection->event($topic->getId(),['msg' => $counters]);
            }
        });
...
    }

但现在我切换到 "standalone" 定期，就像这里描述的那样 https://github.com/GeniusesOfSymfony/WebSocketBundle/blob/master/Periodic/PdoPeriodicPing.php 并将其附加到 websocket。现在数据库没有超时。

Answer 2

值得注意的是，当您按照 Symfony 文档创建 PdoSessionHandler http://symfony.com/doc/current/doctrine/pdo_session_storage.html where you are passing the dsn instead of pdo service it won't work, because the session handler will create other connection. To solve this create a pdo service and pass it to the PdoSessionHandler like it is described in the https://github.com/GeniusesOfSymfony/WebSocketBundle/blob/master/Resources/docs/SessionSetup.md

Symfony4: Gos Websocket Error: MySQL server has gone away

Symfony4: Gos Websocket Error: MySQL server has gone away

pdo

websocket

symfony

symfony4