delay strategy

pkg/enqueue/Client/Amqp/DelayPluginDelayStrategy.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Enqueue\Client\Amqp;
+
+use Interop\Amqp\AmqpContext;
+use Interop\Amqp\AmqpDestination;
+use Interop\Amqp\AmqpMessage;
+use Interop\Amqp\AmqpQueue;
+use Interop\Amqp\AmqpTopic;
+use Interop\Amqp\Impl\AmqpBind;
+
+class DelayPluginDelayStrategy implements DelayStrategy
+{
+    public function delayMessage(AmqpContext $context, AmqpDestination $dest, AmqpMessage $message)
+    {
+        $delaySec = 1235; // $message->getDelay();
+
+        if ($dest instanceof AmqpTopic) {
+            $delayTopic = $context->createTopic($dest->getTopicName().'.x.delayed');
+            $delayTopic->setType('x-delayed-message');
+            $delayTopic->addFlag(AmqpTopic::FLAG_DURABLE);
+            $delayTopic->setArgument('x-delayed-type', AmqpTopic::TYPE_DIRECT);
+
+            $context->declareTopic($delayTopic);
+            $context->bind(new AmqpBind($dest, $delayTopic));
+        } elseif ($dest instanceof AmqpQueue) {
+            $delayTopic = $context->createTopic($dest->getQueueName().'.delayed');
+            $delayTopic->setType('x-delayed-message');
+            $delayTopic->addFlag(AmqpTopic::FLAG_DURABLE);
+            $delayTopic->setArgument('x-delayed-type', AmqpTopic::TYPE_DIRECT);
+
+            $context->declareTopic($delayTopic);
+            $context->bind(new AmqpBind($delayTopic, $dest, $dest->getQueueName()));
+        } else {
+            throw new \LogicException();
+        }
+
+        $delayMessage = $context->createMessage($message->getBody(), $message->getProperties(), $message->getHeaders());
+        $delayMessage->setProperty('x-delay', (string) ($delaySec * 1000));
+
+        $context->createProducer()->send($delayTopic, $delayMessage);
+    }
+}

pkg/enqueue/Client/Amqp/DelayStrategy.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Enqueue\Client\Amqp;
+
+use Interop\Amqp\AmqpContext;
+use Interop\Amqp\AmqpDestination;
+use Interop\Amqp\AmqpMessage;
+
+interface DelayStrategy
+{
+    /**
+     * @param AmqpContext     $context
+     * @param AmqpDestination $dest
+     * @param AmqpMessage     $message
+     */
+    public function delayMessage(AmqpContext $context, AmqpDestination $dest, AmqpMessage $message);
+}

pkg/enqueue/Client/Amqp/DlxDelayStrategy.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Enqueue\Client\Amqp;
+
+use Interop\Amqp\AmqpContext;
+use Interop\Amqp\AmqpDestination;
+use Interop\Amqp\AmqpMessage;
+use Interop\Amqp\AmqpQueue;
+use Interop\Amqp\AmqpTopic;
+
+class DlxDelayStrategy implements DelayStrategy
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function delayMessage(AmqpContext $context, AmqpDestination $dest, AmqpMessage $message)
+    {
+        $delaySec = 1235; // $message->getDelay();
+
+        if ($dest instanceof AmqpTopic) {
+            $delayQueue = $context->createQueue($dest->getTopicName().'.'.$delaySec.'.x.delayed');
+            $delayQueue->addFlag(AmqpTopic::FLAG_DURABLE);
+            $delayQueue->setArgument('x-dead-letter-exchange', $dest->getTopicName());
+        } elseif ($dest instanceof AmqpQueue) {
+            $delayQueue = $context->createQueue($dest->getQueueName().'.'.$delaySec.'.delayed');
+            $delayQueue->addFlag(AmqpTopic::FLAG_DURABLE);
+            $delayQueue->setArgument('x-dead-letter-exchange', '');
+            $delayQueue->setArgument('x-dead-letter-routing-key', $dest->getQueueName());
+        } else {
+            throw new \LogicException();
+        }
+
+        $context->declareQueue($delayQueue);
+
+        $properties = $message->getProperties();
+
+        // The x-death header must be removed because of the bug in RabbitMQ.
+        // It was reported that the bug is fixed since 3.5.4 but I tried with 3.6.1 and the bug still there.
+        // https://github.com/rabbitmq/rabbitmq-server/issues/216
+        unset($properties['x-death']);
+
+        $delayMessage = $context->createMessage($message->getBody(), $properties, $message->getHeaders());
+        $delayMessage->setExpiration((string) ($delaySec * 1000));
+
+        $context->createProducer()->send($delayQueue, $delayMessage);
+    }
+}