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<?php |
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namespace Puzzle\AMQP\Clients; |
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use Puzzle\Configuration; |
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use Puzzle\PrefixedConfiguration; |
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use Puzzle\AMQP\Client; |
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use Psr\Log\LoggerAwareTrait; |
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use Psr\Log\NullLogger; |
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use Puzzle\AMQP\WritableMessage; |
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use Puzzle\AMQP\Clients\Processors\MessageProcessorAware; |
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use Puzzle\AMQP\Clients\MemoryManagementStrategies\NullMemoryManagementStrategy; |
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class Pecl implements Client |
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{ |
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use |
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LoggerAwareTrait, |
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MessageProcessorAware; |
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const |
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DEFAULT_PORT = 5672; |
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private |
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$applicationId, |
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$configuration, |
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$channel, |
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$memoryManagementStrategy; |
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public function __construct(Configuration $configuration) |
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{ |
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$this->applicationId = $configuration->read('app/id', 'Unknown application'); |
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$this->configuration = $configuration; |
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$this->channel = null; |
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$this->memoryManagementStrategy = new NullMemoryManagementStrategy(); |
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$this->logger = new NullLogger(); |
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} |
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public function setMemoryManagementStrategy(MemoryManagementStrategy $strategy) |
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{ |
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$this->memoryManagementStrategy = $strategy; |
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return $this; |
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} |
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private function ensureIsConnected() |
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{ |
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if(! $this->channel instanceof \AMQPChannel) |
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{ |
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$configuration = new PrefixedConfiguration($this->configuration, 'amqp/broker'); |
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// Create a connection |
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$connection = new \AMQPConnection(); |
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$connection->setHost($configuration->readRequired('host')); |
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$connection->setLogin($configuration->readRequired('login')); |
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$connection->setPassword($configuration->readRequired('password')); |
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$connection->setPort($configuration->read('port', self::DEFAULT_PORT)); |
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$vhost = $configuration->read('vhost', null); |
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if($vhost !== null) |
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{ |
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$connection->setVhost($vhost); |
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} |
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$connection->connect(); |
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// Create a channel |
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$this->channel = new \AMQPChannel($connection); |
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} |
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} |
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public function publish($exchangeName, WritableMessage $message) |
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{ |
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if($message->isChunked()) |
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{ |
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$client = new ChunkedMessageClient($client, $this->memoryManagementStrategy); |
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return $client->publish($exchangeName, $message); |
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} |
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try |
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{ |
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$ex = $this->getExchange($exchangeName); |
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} |
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catch(\Exception $e) |
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{ |
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$this->logMessage($exchangeName, $message); |
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return false; |
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} |
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return $this->sendMessage($ex, $message); |
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} |
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private function logMessage($exchangeName, WritableMessage $message) |
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{ |
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$log = json_encode(array( |
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'exchange' => $exchangeName, |
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'message' => (string) $message, |
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)); |
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$this->logger->error($log, ['This message was involved by an error (it was sent ... or not. Please check other logs)']); |
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} |
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private function sendMessage(\AMQPExchange $ex, WritableMessage $message) |
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{ |
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try |
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{ |
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$this->updateMessageAttributes($message); |
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$ex->publish( |
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$message->getBodyInTransportFormat(), |
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$message->getRoutingKey(), |
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$this->computeMessageFlag($message), |
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$message->packAttributes() |
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); |
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} |
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catch(\Exception $e) |
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{ |
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$this->logMessage($ex->getName(), $message); |
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return false; |
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} |
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return true; |
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} |
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private function computeMessageFlag(WritableMessage $message) |
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{ |
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$flag = AMQP_NOPARAM; |
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$disallowSilentDropping = $this->configuration->read('amqp/global/disallowSilentDropping', false); |
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if($disallowSilentDropping === true || $message->canBeDroppedSilently() === false) |
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{ |
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$flag = AMQP_MANDATORY; |
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} |
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return $flag; |
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} |
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public function getExchange($exchangeName = null, $type = AMQP_EX_TYPE_TOPIC) |
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{ |
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$this->ensureIsConnected(); |
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$ex = new \AMQPExchange($this->channel); |
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if(!empty($exchangeName)) |
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{ |
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$ex->setName($exchangeName); |
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$ex->setType($type); |
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$ex->setFlags(AMQP_PASSIVE); |
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$ex->declareExchange(); |
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} |
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return $ex; |
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} |
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private function updateMessageAttributes(WritableMessage $message) |
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{ |
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$message->setAttribute('app_id', $this->applicationId); |
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$message->addHeader('routing_key', $message->getRoutingKey()); |
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$this->onPublish($message); |
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} |
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public function getQueue($queueName) |
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{ |
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$this->ensureIsConnected(); |
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$queue = new \AMQPQueue($this->channel); |
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$queue->setName($queueName); |
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return $queue; |
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} |
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} |
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puzzle-org /
amqp
This error can happen if you refactor code and forget to move the variable initialization.
Let’s take a look at a simple example:
The above code is perfectly fine. Now imagine that we re-order the statements:
In that case,
$xwould be read before it is initialized. This was a very basic example, however the principle is the same for the found issue.