Symfony Messenger 和 Mailer：如何添加绑定密钥？

我有一个正在运行的 Symfony 4.4 项目，其中包含Messenger和rabbitMQ。 我有一个带有 2 个队列的异步传输。

    transports:
        # https://symfony.com/doc/current/messenger.html#transport-configuration
      async:
        dsn: '%env(MESSENGER_TRANSPORT_DSN)%'
        options:
          exchange:
            name: myexchange
            type: direct
          queues:
            email:
              binding_keys:
                - email
            extranet:
              binding_keys:
                  - extranet
        # failed: 'doctrine://default?queue_name=failed'
        # sync: 'sync://'

    routing:
        # Route your messages to the transports
        'App\Message\ExtranetMessage': async
        'Symfony\Component\Mailer\Messenger\SendEmailMessage': async

我需要发送电子邮件symfony/mailer电子邮件队列的组件。

public function contact(Request $request, MailerInterface $mailer)
{
    if($request->isXmlHttpRequest())
    {
        //dd($request->request->all());
        $body =
            'Nouveau message depuis le front<br />
             Nom = '.$request->request->get('nom').'<br />
             Prénom = '.$request->request->get('prenom').'<br />
             Société = '.$request->request->get('societe').'<br />
             Email = '.$request->request->get('mail').'<br />';

        $email = (new Email())
            ->from('[email protected] /cdn-cgi/l/email-protection')
            ->replyTo($request->request->get('mail'))
            ->to('$request->request->get('mail')')
            ->subject('test')
            ->html($body);

        $mailer->send($email);

        return new JsonResponse('OK', 200);
    }
}

如何将绑定密钥添加到mailer为了让rabbitMQ知道如何处理电子邮件？

可以指定路由键通过邮票 https://symfony.com/doc/current/messenger.html#amqp-transport。不幸的是，邮件程序集成没有公开添加它们的方法，它只是将消息分派到默认队列。但您仍然可以手动发送消息：

$this->dispatchMessage(new SendEmailMessage($email), [new AmqpStamp('email')]);

这种方法有一些局限性：因为这没有使用mailer code, MessageEvent不会发送，并且分析器中的“电子邮件”窗格将为空。

另一种选择是使用中间件添加标记：

1. 创建中间件

// src/Messenger/StampEmailMessageMiddleware.php
class StampEmailMessageMiddleware implements MiddlewareInterface
{
    const bindingKey = 'email';

    public function handle(Envelope $envelope, StackInterface $stack): Envelope
    {
        // Add the stamp. Since the middleware gets called both when dispatching and 
        // consuming the message, we make sure there's no stamp already added.
        if (
            $envelope->getMessage() instanceof SendEmailMessage && 
            null === $envelope->last(AmqpStamp::class)
        ) {
            $envelope = $envelope->with(new AmqpStamp(self::bindingKey));
        }

        return $stack->next()->handle($envelope, $stack);
    }
}

2. 将中间件添加到总线配置中：

# config/packages/messenger.yaml
messenger:
    buses:
        messenger.bus.default:
            middleware:
                - 'App\Messenger\StampEmailMessageMiddleware'

3. 正常发送消息：

$mailer->send($email);