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