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<?php |
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namespace Gendoria\CommandQueueRabbitMqDriverBundle\Worker; |
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use Exception; |
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use Gendoria\CommandQueue\Command\CommandInterface; |
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use Gendoria\CommandQueue\CommandProcessor\CommandProcessorInterface; |
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use Gendoria\CommandQueue\ProcessorFactoryInterface; |
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use Gendoria\CommandQueue\ProcessorNotFoundException; |
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use Gendoria\CommandQueue\Worker\Exception\ProcessorErrorException; |
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use Gendoria\CommandQueue\Worker\Exception\TranslateErrorException; |
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use Gendoria\CommandQueueBundle\Worker\BaseSymfonyWorker; |
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use InvalidArgumentException; |
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use JMS\Serializer\Serializer; |
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use OldSound\RabbitMqBundle\RabbitMq\ConsumerInterface; |
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use OldSound\RabbitMqBundle\RabbitMq\ProducerInterface; |
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use PhpAmqpLib\Message\AMQPMessage; |
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use Psr\Log\LoggerInterface; |
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use Symfony\Component\EventDispatcher\EventDispatcherInterface; |
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/** |
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* Command queue worker listening on commands form RabbitMQ channel. |
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* |
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* @author Tomasz Struczyński <[email protected]> |
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*/ |
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class RabbitMqWorker extends BaseSymfonyWorker implements ConsumerInterface |
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{ |
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/** |
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* Rabbit MQ worker subsystem name. |
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* |
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* @var string |
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*/ |
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const SUBSYSTEM_NAME = "RabbitMqworker"; |
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/** |
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* Serializer instance. |
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* |
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* @var Serializer |
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*/ |
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private $serializer; |
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/** |
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* Reschedule producer instance. |
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* |
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* @var ProducerInterface |
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*/ |
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private $rescheduleProducer; |
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/** |
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* Class constructor. |
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* |
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* @param EventDispatcherInterface $eventDispatcher Symfony event dispatcher. |
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* @param ProcessorFactoryInterface $processorFactory |
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* @param Serializer $serializer |
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* @param ProducerInterface $rescheduleProducer |
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* @param LoggerInterface $logger Logger instance. |
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*/ |
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public function __construct(EventDispatcherInterface $eventDispatcher, ProcessorFactoryInterface $processorFactory, Serializer $serializer, ProducerInterface $rescheduleProducer, LoggerInterface $logger = null) |
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{ |
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parent::__construct($processorFactory, $eventDispatcher, $logger); |
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$this->serializer = $serializer; |
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$this->rescheduleProducer = $rescheduleProducer; |
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} |
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/** |
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* Process single message received from RabbitMq server. |
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* |
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* @param AMQPMessage $msg |
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* |
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* @return null|integer Return code, dictating further message status. |
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*/ |
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public function execute(AMQPMessage $msg) |
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{ |
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//We try to process message. On known errors we try to reschedule. On unknown - we simply reject. |
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try { |
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$this->process($msg); |
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} catch (ProcessorErrorException $e) { |
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$this->maybeReschedule($msg, $e, $e->getProcessor()); |
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return self::MSG_REJECT; |
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} catch (ProcessorNotFoundException $e) { |
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$this->maybeReschedule($msg, $e); |
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return self::MSG_REJECT; |
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} catch (TranslateErrorException $e) { |
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$this->maybeReschedule($msg, $e); |
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return self::MSG_REJECT; |
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} |
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return self::MSG_ACK; |
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} |
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protected function translateCommand($commandData) |
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{ |
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/* @var $commandData AMQPMessage */ |
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$headers = $commandData->get('application_headers')->getNativeData(); |
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if (empty($headers['x-class-name'])) { |
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throw new InvalidArgumentException("Class name header 'x-class-name' not found"); |
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} |
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$command = $this->serializer->deserialize($commandData->body, $headers['x-class-name'], 'json'); |
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if (!is_object($command)) { |
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throw new InvalidArgumentException("Translated command should be an object."); |
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} |
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if (!$command instanceof CommandInterface) { |
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throw new InvalidArgumentException("Translated command should implement interface CommandInterface."); |
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} |
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return $command; |
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} |
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public function getSubsystemName() |
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{ |
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return self::SUBSYSTEM_NAME; |
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} |
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/** |
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* Send message for rescheduler, if maximum number of tries has not been exceeded. |
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* |
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* @param AMQPMessage $msg |
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* @param Exception $e |
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* @param CommandProcessorInterface $processor |
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*/ |
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private function maybeReschedule(AMQPMessage $msg, Exception $e, CommandProcessorInterface $processor = null) |
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{ |
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$triesNum = 10; |
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$headers = $msg->get('application_headers')->getNativeData(); |
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$retryCount = $this->getRetryCount($headers); |
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$retry = ($retryCount < $triesNum - 1); |
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$resheduleInS = (5 * $retryCount + 10); |
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$this->logger->error( |
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sprintf( |
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'Error while executing processor (retry count: %d - %s): %s', $retryCount + 1, $retry ? 'retry in ' . $resheduleInS . 's' : 'reject', $e->getMessage() |
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), array($e->getTraceAsString(), $this, $processor) |
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); |
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if ($retry) { |
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$this->rescheduleProducer->publish( |
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$msg->body, (string)$msg->delivery_info['routing_key'], array_merge( |
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$msg->get_properties(), array('expiration' => $resheduleInS * 1000) |
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) |
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); |
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} |
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} |
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/** |
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* Get retry count. |
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* |
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* @param array $headers |
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* @return integer |
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*/ |
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private function getRetryCount($headers) |
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{ |
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if (!empty($headers['x-death'])) { |
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if (!empty($headers['x-death'][0]['count'])) { |
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$retryCount = $headers['x-death'][0]['count']; |
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1 |
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} else { |
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$retryCount = count($headers['x-death']); |
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} |
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1 |
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} else { |
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$retryCount = 0; |
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} |
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return $retryCount; |
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} |
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} |
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Gendoria /
command-queue-rabbitmq-bundle
