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PostgreSqlConnection.php
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PostgreSqlConnection.php
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace Symfony\Component\Messenger\Bridge\Doctrine\Transport;
/**
* Uses PostgreSQL LISTEN/NOTIFY to push messages to workers.
*
* @internal
* @final
*
* @author Kévin Dunglas <dunglas@gmail.com>
*/
class PostgreSqlConnection extends Connection
{
/**
* * use_notify: Set to false to disable the use of LISTEN/NOTIFY. Default: true
* * check_delayed_interval: The interval to check for delayed messages, in milliseconds. Set to 0 to disable checks. Default: 1000
* * get_notify_timeout: The length of time to wait for a response when calling PDO::pgsqlGetNotify, in milliseconds. Default: 0.
*/
protected const DEFAULT_OPTIONS = parent::DEFAULT_OPTIONS + [
'check_delayed_interval' => 1000,
'get_notify_timeout' => 0,
];
private $listening = false;
public function __sleep()
{
throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
}
public function __wakeup()
{
throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
}
public function __destruct()
{
$this->unlisten();
}
public function reset()
{
parent::reset();
$this->unlisten();
}
public function get(): ?array
{
if (null === $this->queueEmptiedAt) {
return parent::get();
}
if (!$this->listening) {
// This is secure because the table name must be a valid identifier:
// https://www.postgresql.org/docs/current/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS
$this->driverConnection->exec(sprintf('LISTEN "%s"', $this->configuration['table_name']));
$this->listening = true;
}
$notification = $this->driverConnection->getWrappedConnection()->pgsqlGetNotify(\PDO::FETCH_ASSOC, $this->configuration['get_notify_timeout']);
if (
// no notifications, or for another table or queue
(false === $notification || $notification['message'] !== $this->configuration['table_name'] || $notification['payload'] !== $this->configuration['queue_name']) &&
// delayed messages
(microtime(true) * 1000 - $this->queueEmptiedAt < $this->configuration['check_delayed_interval'])
) {
return null;
}
return parent::get();
}
public function setup(): void
{
parent::setup();
$sql = sprintf(<<<'SQL'
LOCK TABLE %1$s;
-- create trigger function
CREATE OR REPLACE FUNCTION notify_%1$s() RETURNS TRIGGER AS $$
BEGIN
PERFORM pg_notify('%1$s', NEW.queue_name::text);
RETURN NEW;
END;
$$ LANGUAGE plpgsql;
-- register trigger
DROP TRIGGER IF EXISTS notify_trigger ON %1$s;
CREATE TRIGGER notify_trigger
AFTER INSERT
ON %1$s
FOR EACH ROW EXECUTE PROCEDURE notify_%1$s();
SQL
, $this->configuration['table_name']);
$this->driverConnection->exec($sql);
}
private function unlisten()
{
if (!$this->listening) {
return;
}
$this->driverConnection->exec(sprintf('UNLISTEN "%s"', $this->configuration['table_name']));
$this->listening = false;
}
}