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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 Psr\EventDispatcher\EventDispatcherInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\NullLogger;
use Symfony\Component\Messenger\Envelope;
use Symfony\Component\Messenger\Event\SendMessageToTransportsEvent;
use Symfony\Component\Messenger\Exception\NoSenderForMessageException;
use Symfony\Component\Messenger\Stamp\ReceivedStamp;
use Symfony\Component\Messenger\Stamp\SentStamp;
use Symfony\Component\Messenger\Transport\Sender\SendersLocatorInterface;
/**
* @author Samuel Roze <samuel.roze@gmail.com>
* @author Tobias Schultze <http://tobion.de>
*/
class SendMessageMiddleware implements MiddlewareInterface
{
use LoggerAwareTrait;
private SendersLocatorInterface $sendersLocator;
private ?EventDispatcherInterface $eventDispatcher;
private bool $allowNoSenders;
public function __construct(SendersLocatorInterface $sendersLocator, EventDispatcherInterface $eventDispatcher = null, bool $allowNoSenders = true)
{
$this->sendersLocator = $sendersLocator;
$this->eventDispatcher = $eventDispatcher;
$this->allowNoSenders = $allowNoSenders;
$this->logger = new NullLogger();
}
public function handle(Envelope $envelope, StackInterface $stack): Envelope
{
$context = [
'class' => $envelope->getMessage()::class,
];
$sender = null;
if ($envelope->all(ReceivedStamp::class)) {
// it's a received message, do not send it back
$this->logger->info('Received message {class}', $context);
} else {
$shouldDispatchEvent = true;
$senders = $this->sendersLocator->getSenders($envelope);
$senders = \is_array($senders) ? $senders : iterator_to_array($senders);
foreach ($senders as $alias => $sender) {
if (null !== $this->eventDispatcher && $shouldDispatchEvent) {
$event = new SendMessageToTransportsEvent($envelope, $senders);
$this->eventDispatcher->dispatch($event);
$envelope = $event->getEnvelope();
$shouldDispatchEvent = false;
}
$this->logger->info('Sending message {class} with {alias} sender using {sender}', $context + ['alias' => $alias, 'sender' => $sender::class]);
$envelope = $sender->send($envelope->with(new SentStamp($sender::class, \is_string($alias) ? $alias : null)));
}
if (!$this->allowNoSenders && !$sender) {
throw new NoSenderForMessageException(sprintf('No sender for message "%s".', $context['class']));
}
}
if (null === $sender) {
return $stack->next()->handle($envelope, $stack);
}
// message should only be sent and not be handled by the next middleware
return $envelope;
}
}