[Feature] Bulk Consumer

Command/BatchConsumerCommand.php

@@ -0,0 +1,106 @@
+<?php
+
+namespace OldSound\RabbitMqBundle\Command;
+
+use OldSound\RabbitMqBundle\RabbitMq\BatchConsumer;
+use PhpAmqpLib\Exception\AMQPTimeoutException;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+final class BatchConsumerCommand extends BaseRabbitMqCommand
+{
+    /**
+     * @var BatchConsumer
+     */
+    protected $consumer;
+
+    public function stopConsumer()
+    {
+        if ($this->consumer instanceof BatchConsumer) {
+            // Process current message, then halt consumer
+            $this->consumer->forceStopConsumer();
+
+            // Halt consumer if waiting for a new message from the queue
+            try {
+                $this->consumer->stopConsuming();
+            } catch (AMQPTimeoutException $e) {}
+        }
+    }
+
+    protected function configure()
+    {
+        parent::configure();
+
+        $this
+            ->setName('rabbitmq:batch:consumer')
+            ->addArgument('name', InputArgument::REQUIRED, 'Consumer Name')
+            ->addOption('route', 'r', InputOption::VALUE_OPTIONAL, 'Routing Key', '')
+            ->addOption('memory-limit', 'l', InputOption::VALUE_OPTIONAL, 'Allowed memory for this process', null)
+            ->addOption('debug', 'd', InputOption::VALUE_NONE, 'Enable Debugging')
+            ->addOption('without-signals', 'w', InputOption::VALUE_NONE, 'Disable catching of system signals')
+            ->setDescription('Executes a Batch Consumer');
+        ;
+    }
+
+    /**
+     * Executes the current command.
+     *
+     * @param   InputInterface      $input      An InputInterface instance
+     * @param   OutputInterface     $output     An OutputInterface instance
+     *
+     * @return  integer                         0 if everything went fine, or an error code
+     *
+     * @throws  \InvalidArgumentException       When the number of messages to consume is less than 0
+     * @throws  \BadFunctionCallException       When the pcntl is not installed and option -s is true
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if (defined('AMQP_WITHOUT_SIGNALS') === false) {
+            define('AMQP_WITHOUT_SIGNALS', $input->getOption('without-signals'));
+        }
+
+        if (!AMQP_WITHOUT_SIGNALS && extension_loaded('pcntl')) {
+            if (!function_exists('pcntl_signal')) {
+                throw new \BadFunctionCallException("Function 'pcntl_signal' is referenced in the php.ini 'disable_functions' and can't be called.");
+            }
+
+            pcntl_signal(SIGTERM, array(&$this, 'stopConsumer'));
+            pcntl_signal(SIGINT, array(&$this, 'stopConsumer'));
+        }
+
+        if (defined('AMQP_DEBUG') === false) {
+            define('AMQP_DEBUG', (bool) $input->getOption('debug'));
+        }
+
+        $this->initConsumer($input);
+
+        return $this->consumer->consume();
+    }
+
+    /**
+     * @param   InputInterface  $input
+     */
+    protected function initConsumer(InputInterface $input)
+    {
+        $this->consumer = $this->getContainer()
+            ->get(sprintf($this->getConsumerService(), $input->getArgument('name')));
+
+        if (null !== $input->getOption('memory-limit') &&
+            ctype_digit((string) $input->getOption('memory-limit')) &&
+            $input->getOption('memory-limit') > 0
+        ) {
+            $this->consumer->setMemoryLimit($input->getOption('memory-limit'));
+        }
+        $this->consumer->setRoutingKey($input->getOption('route'));
+    }
+
+    /**
+     * @return  string
+     */
+    protected function getConsumerService()
+    {
+        return 'old_sound_rabbit_mq.%s_batch';
+    }
+}

DependencyInjection/Configuration.php

@@ -13,11 +13,26 @@
  */
 class Configuration implements ConfigurationInterface
 {
+    /**
+     * @var string
+     */
+    protected $name;
+
+    /**
+     * Configuration constructor.
+     *
+     * @param   string  $name
+     */
+    public function __construct($name)
+    {
+        $this->name = $name;
+    }
+
     public function getConfigTreeBuilder()
     {
         $tree = new TreeBuilder();
 
-        $rootNode = $tree->root('old_sound_rabbit_mq');
+        $rootNode = $tree->root($this->name);
 
         $rootNode
             ->children()
@@ -33,6 +48,7 @@ public function getConfigTreeBuilder()
         $this->addConsumers($rootNode);
         $this->addMultipleConsumers($rootNode);
         $this->addDynamicConsumers($rootNode);
+        $this->addBatchConsumers($rootNode);
         $this->addAnonConsumers($rootNode);
         $this->addRpcClients($rootNode);
         $this->addRpcServers($rootNode);
@@ -227,6 +243,43 @@ protected function addDynamicConsumers(ArrayNodeDefinition $node)
         ;
     }
 
+    /**
+     * @param   ArrayNodeDefinition     $node
+     *
+     * @return  void
+     */
+    protected function addBatchConsumers(ArrayNodeDefinition $node)
+    {
+        $node
+            ->children()
+                ->arrayNode('batch_consumers')
+                    ->canBeUnset()
+                    ->useAttributeAsKey('key')
+                    ->prototype('array')
+                        ->append($this->getExchangeConfiguration())
+                        ->append($this->getQueueConfiguration())
+                        ->children()
+                            ->scalarNode('connection')->defaultValue('default')->end()
+                            ->scalarNode('callback')->isRequired()->end()
+                            ->scalarNode('idle_timeout')->end()
+                            ->scalarNode('timeout_wait')->defaultValue(3)->end()
+                            ->scalarNode('idle_timeout_exit_code')->end()
+                            ->scalarNode('auto_setup_fabric')->defaultTrue()->end()
+                            ->arrayNode('qos_options')
+                                ->children()
+                                    ->scalarNode('prefetch_size')->defaultValue(0)->end()
+                                    ->scalarNode('prefetch_count')->defaultValue(2)->end()
+                                    ->booleanNode('global')->defaultFalse()->end()
+                                ->end()
+                            ->end()
+                            ->scalarNode('enable_logger')->defaultFalse()->end()
+                        ->end()
+                    ->end()
+                ->end()
+            ->end()
+        ;
+    }
+
     protected function addAnonConsumers(ArrayNodeDefinition $node)
     {
         $node

DependencyInjection/OldSoundRabbitMqExtension.php

@@ -41,7 +41,7 @@ public function load(array $configs, ContainerBuilder $container)
         $loader = new XmlFileLoader($this->container, new FileLocator(array(__DIR__ . '/../Resources/config')));
         $loader->load('rabbitmq.xml');
 
-        $configuration = new Configuration();
+        $configuration = new Configuration($this->getAlias());
         $this->config = $this->processConfiguration($configuration, $configs);
 
         $this->collectorEnabled = $this->config['enable_collector'];
@@ -52,6 +52,7 @@ public function load(array $configs, ContainerBuilder $container)
         $this->loadConsumers();
         $this->loadMultipleConsumers();
         $this->loadDynamicConsumers();
+        $this->loadBatchConsumers();
         $this->loadAnonConsumers();
         $this->loadRpcClients();
         $this->loadRpcServers();
@@ -358,6 +359,55 @@ protected function loadDynamicConsumers()
         }
     }
 
+    protected function loadBatchConsumers()
+    {
+        foreach ($this->config['batch_consumers'] as $key => $consumer) {
+            $definition = new Definition('%old_sound_rabbit_mq.batch_consumer.class%');
+
+            if (!isset($consumer['exchange_options'])) {
+                $consumer['exchange_options'] = $this->getDefaultExchangeOptions();
+            }
+
+            $definition
+                ->addTag('old_sound_rabbit_mq.base_amqp')
+                ->addTag('old_sound_rabbit_mq.batch_consumer')
+                ->addMethodCall('setTimeoutWait', array($consumer['timeout_wait']))
+                ->addMethodCall('setPrefetchCount', array($consumer['qos_options']['prefetch_count']))
+                ->addMethodCall('setCallback', array(array(new Reference($consumer['callback']), 'batchExecute')))
+                ->addMethodCall('setExchangeOptions', array($this->normalizeArgumentKeys($consumer['exchange_options'])))
+                ->addMethodCall('setQueueOptions', array($this->normalizeArgumentKeys($consumer['queue_options'])))
+                ->addMethodCall('setQosOptions', array(
+                    $consumer['qos_options']['prefetch_size'],
+                    $consumer['qos_options']['prefetch_count'],
+                    $consumer['qos_options']['global']
+                ))
+            ;
+
+            if (isset($consumer['idle_timeout_exit_code'])) {
+                $definition->addMethodCall('setIdleTimeoutExitCode', array($consumer['idle_timeout_exit_code']));
+            }
+
+            if (isset($consumer['idle_timeout'])) {
+                $definition->addMethodCall('setIdleTimeout', array($consumer['idle_timeout']));
+            }
+
+            if (!$consumer['auto_setup_fabric']) {
+                $definition->addMethodCall('disableAutoSetupFabric');
+            }
+
+            $this->injectConnection($definition, $consumer['connection']);
+            if ($this->collectorEnabled) {
+                $this->injectLoggedChannel($definition, $key, $consumer['connection']);
+            }
+
+            if ($consumer['enable_logger']) {
+                $this->injectLogger($definition);
+            }
+
+            $this->container->setDefinition(sprintf('old_sound_rabbit_mq.%s_batch', $key), $definition);
+        }
+    }
+
     protected function loadAnonConsumers()
     {
         foreach ($this->config['anon_consumers'] as $key => $anon) {

README.md

@@ -755,6 +755,101 @@ $ ./app/console_dev rabbitmq:anon-consumer -m 5 -r '#.error' logs_watcher
 
 The only new option compared to the commands that we have seen before is the one that specifies the __routing key__: `-r '#.error'`.
 
+### Batch Consumers ###
+
+In some cases you will want to get a batch of messages and then do some processing on all of them. Batch consumers will allow you to define logic for this type of processing.
+
+e.g: Imagine that you have a queue where you receive a message for inserting some information in the database, and you realize that if you do a batch insert is much better then by inserting one by one.
+
+Define a callback service that implements `BatchConsumerInterface` and add the definition of the consumer to your configuration.
+
+```yaml
+batch_consumers:
+    batch_basic_consumer:
+        connection:       default
+        exchange_options: {name: 'batch', type: fanout}
+        queue_options:    {name: 'batch'}
+        callback:         batch.basic
+        qos_options:      {prefetch_size: 0, prefetch_count: 2, global: false}
+        timeout_wait:     5
+        auto_setup_fabric: false
+        idle_timeout_exit_code: -2
+```
+
+You can implement a batch consumer that will acknowledge all messages in one return or you can have control on what message to acknoledge.
+
+```php
+namespace AppBundle\Service;
+
+use OldSound\RabbitMqBundle\RabbitMq\BatchConsumerInterface;
+use PhpAmqpLib\Message\AMQPMessage;
+
+class DevckBasicConsumer implements BatchConsumerInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function batchExecute(array $messages)
+    {
+        echo sprintf('Doing batch execution%s', PHP_EOL);
+        foreach ($messages as $message) {
+            $this->executeSomeLogicPerMessage($message);
+        }
+
+        // you ack all messages got in batch
+        return true; 
+    }
+}
+```
+
+```php
+namespace AppBundle\Service;
+
+use OldSound\RabbitMqBundle\RabbitMq\BatchConsumerInterface;
+use PhpAmqpLib\Message\AMQPMessage;
+
+class DevckBasicConsumer implements BatchConsumerInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function batchExecute(array $messages)
+    {
+        echo sprintf('Doing batch execution%s', PHP_EOL);
+        $result = [];
+        /** @var AMQPMessage $message */
+        foreach ($messages as $message) {
+            $result[(int)$message->delivery_info['delivery_tag']] = $this->executeSomeLogicPerMessage($message);
+        }
+
+        // you ack only some messages that have return true
+        // e.g:
+        // $return = [
+        //      1 => true,
+        //      2 => true,
+        //      3 => false,
+        //      4 => true,
+        //      5 => -1,
+        //      6 => 2,
+        //  ];
+        // The following will happen:
+        //  * ack: 1,2,4
+        //  * reject and requeq: 3
+        //  * nack and requeue: 6
+        //  * reject and drop: 5
+        return $result;
+    }
+}
+```
+
+How to run the following batch consumer:
+
+```bash
+    $ ./bin/console rabbitmq:batch:consumer batch_basic_consumer -w
+```
+
+Important: BatchConsumers will not have the -m|messages option available
+
 ### STDIN Producer ###
 
 There's a Command that reads data from STDIN and publishes it to a RabbitMQ queue. To use it first you have to configure a `producer` service in your configuration file like this:

RabbitMq/BaseConsumer.php

@@ -90,8 +90,6 @@ protected function maybeStopConsumer()
 
         if ($this->forceStop || ($this->consumed == $this->target && $this->target > 0)) {
             $this->stopConsuming();
-        } else {
-            return;
         }
     }