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<?php |
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declare(strict_types=1); |
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namespace Werkspot\MessageQueue\DeliveryQueue; |
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use DateTime; |
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use ErrorException; |
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use Exception; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\NullLogger; |
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use Throwable; |
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use Werkspot\MessageQueue\Message\MessageInterface; |
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final class MessageHandler implements MessageHandlerInterface |
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{ |
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/** |
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* @var MessageDeliveryServiceInterface |
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*/ |
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private $messageDeliveryService; |
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/** |
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* @var PersistenceClientInterface |
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*/ |
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private $persistenceClient; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @var MessageInterface |
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*/ |
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private $message; |
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public function __construct( |
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MessageDeliveryServiceInterface $messageDeliveryService, |
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PersistenceClientInterface $persistenceClient, |
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LoggerInterface $logger = null |
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) { |
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$this->messageDeliveryService = $messageDeliveryService; |
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$this->persistenceClient = $persistenceClient; |
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$this->logger = $logger ?? new NullLogger(); |
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} |
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public function handle(MessageInterface $message): void |
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{ |
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// There can be an edge case where we get a fatal/exception, and we go out of this flow and keep handlingMessage |
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// on true, but in that case the flow is broken anyway, as handle() should normally handle all cases sanely. |
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// If we're in the shutdown handler, the script is being killed anyway. So we don't care anymore. |
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$this->initiateHandling($message); |
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try { |
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$this->process(); |
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} catch (Throwable $e) { |
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$this->onError($e); |
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} finally { |
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$this->terminateHandling(); |
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// We clear the persistenceClient (entity manager), to ensure each message is handled without stale entities. |
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// Because the workers run for a long time, and we have multiple workers running, we need to prevent |
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// having old entities cached in memory. When other workers already updated the entity to a new state. |
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// Otherwise we would use the old, out-dated state, and overwrite and stuff happened after it in the other |
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// workers. |
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$this->persistenceClient->reset(); |
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} |
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} |
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public function isHandlingMessage(): bool |
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{ |
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return $this->message !== null; |
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} |
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public function shutdown(): void |
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{ |
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$error = error_get_last(); |
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if ($error !== null && $this->isHandlingMessage()) { |
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$this->onError(new ErrorException($error['message'], 0, E_ERROR, $error['file'], $error['line'])); |
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} |
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} |
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public function onError(Throwable $error): void |
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{ |
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// If we have a fatal error, we were not able to rollback the transaction, so we will need to do it here, |
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// otherwise we cannot queue the command below, as it will be in a transaction that will never be committed |
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$this->persistenceClient->rollbackTransaction(); |
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if (!is_subclass_of($this->message, MessageInterface::class)) { |
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// This happens when we have a serialization problem in the queue for whatever reason (e.g. a class |
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// was moved, or renamed). In that case it's not a Command, but an PHP_Incomplete_Class. |
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// If we'd call handleFailure() for an Incomplete_Class we'd get a fatal error, this is not something we |
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// want, because the worker will die. And although supervisor will restart it again, it's not good, |
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// as supervisor will only restart it for an x amount of tries, before giving up, and we end up with |
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// a queue that is stuck. |
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// So in this case we can't log the error with the current logic. It's on the todo to just do an update |
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// in the database directly here, e.g. 'update QueuedCommand set error = ... where id = .. ' but we are |
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// working on the project restructure with a hard deadline and want to prioritize that above this. |
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// At least the fix is there, just not the logging, which we'll do later. |
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$logMessage = sprintf( |
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'Cannot deliver queued message because it is not a MessageInterface %s: %s', |
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$this->message->getId(), |
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$error->getMessage() |
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); |
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$this->logger->error($logMessage); |
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$this->message->fail($error); |
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$this->persistenceClient->persistUndeliverableMessage($this->message, $logMessage); |
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} else { |
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$this->message->fail($error); |
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try { |
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$this->persistenceClient->persist($this->message); |
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} catch (Exception $exception) { |
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// It can happen that we have some problem with persisting most likely a uniqid constraint because of a |
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// race condition or if we processed a message twice. In that case persist it in the |
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// UnRequeueableMessage table so you can do monitoring on this and fix it. |
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$this->persistenceClient->persistUndeliverableMessage($this->message, $exception->getMessage()); |
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throw $exception; |
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} |
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} |
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} |
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private function process(): void |
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{ |
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$this->logger->info('Delivering message: ' . $this->getLogMessage($this->message)); |
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$this->messageDeliveryService->deliver($this->message); |
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} |
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private function getLogMessage(MessageInterface $message): string |
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{ |
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return $message->getId() |
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. ', ' . $message->getDestination() |
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. ', ' . $message->getDeliverAt()->format(DateTime::ATOM) |
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. ', ' . $message->getCreatedAt()->format(DateTime::ATOM) |
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. ', ' . $message->getUpdatedAt()->format(DateTime::ATOM) |
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. ', ' . $message->getTries() |
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. ', ' . $message->getPriority() |
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. ', ' . $this->getPayloadDescription($message); |
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} |
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private function getPayloadDescription(MessageInterface $message): string |
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{ |
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if (is_object($message->getPayload())) { |
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return get_class($message->getPayload()); |
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} |
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if (is_array($message->getPayload())) { |
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return 'array'; |
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} |
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return (string) $message->getPayload(); |
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} |
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private function initiateHandling(MessageInterface $message): void |
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{ |
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$this->message = $message; |
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} |
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private function terminateHandling(): void |
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{ |
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$this->message = null; |
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} |
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} |
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Werkspot /
message-queue
