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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.
- */
- namespace Symfony\Component\Messenger\Middleware;
- use Symfony\Component\Messenger\Bridge\Amqp\Transport\AmqpReceivedStamp;
- use Symfony\Component\Messenger\Envelope;
- use Symfony\Component\Messenger\Exception\RejectRedeliveredMessageException;
- use Symfony\Component\Messenger\Transport\AmqpExt\AmqpReceivedStamp as LegacyAmqpReceivedStamp;
- /**
- * Middleware that throws a RejectRedeliveredMessageException when a message is detected that has been redelivered by AMQP.
- *
- * The middleware runs before the HandleMessageMiddleware and prevents redelivered messages from being handled directly.
- * The thrown exception is caught by the worker and will trigger the retry logic according to the retry strategy.
- *
- * AMQP redelivers messages when they do not get acknowledged or rejected. This can happen when the connection times out
- * or an exception is thrown before acknowledging or rejecting. When such errors happen again while handling the
- * redelivered message, the message would get redelivered again and again. The purpose of this middleware is to prevent
- * infinite redelivery loops and to unblock the queue by republishing the redelivered messages as retries with a retry
- * limit and potential delay.
- *
- * @author Tobias Schultze <http://tobion.de>
- */
- class RejectRedeliveredMessageMiddleware implements MiddlewareInterface
- {
- public function handle(Envelope $envelope, StackInterface $stack): Envelope
- {
- $amqpReceivedStamp = $envelope->last(AmqpReceivedStamp::class);
- if ($amqpReceivedStamp instanceof AmqpReceivedStamp && $amqpReceivedStamp->getAmqpEnvelope()->isRedelivery()) {
- throw new RejectRedeliveredMessageException('Redelivered message from AMQP detected that will be rejected and trigger the retry logic.');
- }
- // Legacy code to support symfony/messenger < 5.1
- $amqpReceivedStamp = $envelope->last(LegacyAmqpReceivedStamp::class);
- if ($amqpReceivedStamp instanceof LegacyAmqpReceivedStamp && $amqpReceivedStamp->getAmqpEnvelope()->isRedelivery()) {
- throw new RejectRedeliveredMessageException('Redelivered message from AMQP detected that will be rejected and trigger the retry logic.');
- }
- return $stack->next()->handle($envelope, $stack);
- }
- }
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