Executing mail sending via Symfony Messenger

I am in search for a big help with my code.I tried everything in my power to connect some Symfony features, and I think I am going somewhere..

I am using Symfony 4.2 and API Platform and trying to add process that sending of the email message to be consumed asynchronously.

I have my Comment entity which is triggering it on persisting entity. It's triggering my __invoke function but there is a problem. I don't quite understand what should I do next.

As it says in documentation here, first I need to configure Data Persister:

<?phpnamespace App\DataPersister;use ApiPlatform\Core\DataPersister\ContextAwareDataPersisterInterface;use ApiPlatform\Core\DataPersister\DataPersisterInterface;use App\Entity\Comment;final class EmailNotificationDataPersister implements ContextAwareDataPersisterInterface{private $decorated;private $mailer;public function __construct(ContextAwareDataPersisterInterface $decorated, \Swift_Mailer $mailer){    $this->decorated = $decorated;    $this->mailer = $mailer;}public function supports($data, array $context = []): bool{    return $this->decorated->supports($data, $context);}public function persist($data, array $context = []){    $result = $this->decorated->persist($data, $context);    if (        $data instanceof Comment && (            ($context['collection_operation_name'] ?? null) === 'post')    ) {        $this->sendWelcomeEmail($data);    }    return $result;}public function remove($data, array $context = []){    return $this->decorated->remove($data, $context);}private function sendWelcomeEmail(Comment $comment){    // Your welcome email logic...    // $this->mailer->send(...);}}

I am using Symfony 4.2 so I have installed swift mailer email client.

Also I have defined EmailSubscriber:

<?phpnamespace App\EventSubscriber;use ApiPlatform\Core\EventListener\EventPriorities;use App\Entity\Comment;use Symfony\Component\EventDispatcher\EventSubscriberInterface;use Symfony\Component\HttpFoundation\Request;use Symfony\Component\HttpKernel\KernelEvents;use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;use Symfony\Component\Messenger\MessageBusInterface;final class EmailNotificationSubscriber implements EventSubscriberInterface{private $messageBus;public function __construct(MessageBusInterface $messageBus){    $this->messageBus = $messageBus;}public static function getSubscribedEvents(){    return [        KernelEvents::VIEW => [ 'sendMail', EventPriorities::POST_WRITE],    ];}public function sendMail(GetResponseForControllerResultEvent $event){    $comment = $event->getControllerResult();    $method = $event->getRequest()->getMethod();    if (!$comment instanceof Comment || Request::METHOD_POST !== $method) {        return;    }    $this->messageBus->dispatch(new Comment());}}

And finally I have implemented handler:

<?phpnamespace App\Handler;use App\Entity\Comment;use Symfony\Component\Messenger\Handler\MessageHandlerInterface;final class EmailNotificationHandler implements MessageHandlerInterface{    public function __invoke(Comment $comment)    {        // do something with the resource    }}

When I trigger persist entity in my api platform the var_dump() from invoke function is caught.

I have no idea if something is wrong and what can I do next. I need for email sending to be executed asynchronously by using the Symfony Messenger.

In my .env file:

MESSENGER_TRANSPORT_DSN=amqp://127.0.0.1:8000/api/messages

And framework .yaml

messenger:    transports:        amqp: "%env(MESSENGER_TRANSPORT_DSN)%"    routing:'App\Entity\Comment': amqp

And also is there any way to send an email to any random mail that is posted in user table? I want to set mailer config for that.