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<?php
use Kafka\Produce;
/**
* Event relayer for Apache Kafka.
* Configuring for WANCache:
* 'relayerConfig' => [ 'class' => 'EventRelayerKafka', 'KafkaEventHost' => 'localhost:9092' ],
*/
class EventRelayerKafka extends EventRelayer {
/**
* Configuration.
*
* @var Config
*/
protected $config;
/**
* Kafka producer.
*
* @var Produce
*/
protected $producer;
/**
* Create Kafka producer.
*
* @param array $params
*/
public function __construct( array $params ) {
parent::__construct( $params );
$this->config = new HashConfig( $params );
if ( !$this->config->has( 'KafkaEventHost' ) ) {
throw new InvalidArgumentException( "KafkaEventHost must be configured" );
}
}
/**
* Get the producer object from kafka-php.
* @return Produce
*/
protected function getKafkaProducer() {
if ( !$this->producer ) {
$this->producer = Produce::getInstance(
null, null, $this->config->get( 'KafkaEventHost' ) );
}
return $this->producer;
}
protected function doNotify( $channel, array $events ) {
$jsonEvents = array_map( 'json_encode', $events );
try {
$producer = $this->getKafkaProducer();
$producer->setMessages( $channel, 0, $jsonEvents );
$producer->send();
} catch ( \Kafka\Exception $e ) {
$this->logger->warning( "Sending events failed: $e" );
return false;
}
return true;
}
}
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