[Messenger] Add a memory limit option for ConsumeMessagesCommand

Command/ConsumeMessagesCommand.php

@@ -19,6 +19,7 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Messenger\MessageBusInterface;
 use Symfony\Component\Messenger\Transport\Enhancers\MaximumCountReceiver;
+use Symfony\Component\Messenger\Transport\Enhancers\MemoryLimitReceiver;
 use Symfony\Component\Messenger\Transport\ReceiverInterface;
 use Symfony\Component\Messenger\Worker;
 
@@ -51,6 +52,7 @@ protected function configure()
             ->setDefinition(array(
                 new InputArgument('receiver', InputArgument::REQUIRED, 'Name of the receiver'),
                 new InputOption('limit', 'l', InputOption::VALUE_REQUIRED, 'Limit the number of received messages'),
+                new InputOption('memory', 'm', InputOption::VALUE_REQUIRED, 'The memory limit in megabytes the worker can consume'),
             ))
             ->setDescription('Consumes messages')
             ->setHelp(<<<'EOF'
@@ -61,6 +63,10 @@ protected function configure()
 Use the --limit option to limit the number of messages received:
 
     <info>php %command.full_name% <receiver-name> --limit=10</info>
+
+Use the --memory option to limit the memory consumed by the worker:
+
+    <info>php %command.full_name% <receiver-name> --memory=128</info>
 EOF
             )
         ;
@@ -83,6 +89,10 @@ protected function execute(InputInterface $input, OutputInterface $output)
             $receiver = new MaximumCountReceiver($receiver, $limit);
         }
 
+        if ($memory = $input->getOption('memory')) {
+            $receiver = new MemoryLimitReceiver($receiver, $memory);
+        }
+
         $worker = new Worker($receiver, $this->bus);
         $worker->run();
     }

Transport/Enhancers/MemoryLimitReceiver.php

@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Messenger\Transport\Enhancers;
+
+use Symfony\Component\Messenger\Transport\ReceiverInterface;
+
+/**
+ * @author Simon Delicata <[email protected]>
+ */
+class MemoryLimitReceiver implements ReceiverInterface
+{
+    private $decoratedReceiver;
+    private $memoryLimit;
+
+    public function __construct(ReceiverInterface $decoratedReceiver, int $memoryLimit)
+    {
+        $this->decoratedReceiver = $decoratedReceiver;
+        $this->memoryLimit = $memoryLimit;
+    }
+
+    public function receive(callable $handler): void
+    {
+        $this->decoratedReceiver->receive(function($message) use ($handler) {
+            $handler($message);
+
+            if (memory_get_usage() / 1024 / 1024 >= $this->memoryLimit) {
+                $this->stop();
+            }
+        });
+    }
+
+    public function stop(): void
+    {
+        $this->decoratedReceiver->stop();
+    }
+}