Metadata cache for Imbo

gistfile1.aw

<?php
class metadatacache implements Imbo\EventManager\ListenerInterface {
    private $memcached;

    public function __construct() {
        $this->memcached = new Memcached();
        $this->memcached->addServer('localhost', 11211);
    }

    public function getEvents() {
        return array(
            'metadata.get.pre',
            'metadata.get.post',
        );
    }

    public function invoke(Imbo\EventManager\EventInterface $event) {
        $response = $event->getResponse();
        $imageIdentifier = $response->getHeaders()->get('x-imbo-imageidentifier');
        $cacheKey = 'metadata:' . $imageIdentifier;

        if ($event->getName() === 'metadata.get.pre') {
            $result = $this->memcached->get($cacheKey);

            if ($result instanceof Imbo\Http\Response\ResponseInterface) {
                $result->send();
                exit;
            }
        } else {
            $this->memcached->set($cacheKey, $response);
        }
    }
}

$request = new Imbo\Http\Request\Request($_GET, $_POST, $_SERVER);
$response = new Imbo\Http\Response\Response();

$eventManager = new Imbo\EventManager\EventManager($request, $response);
$eventManager->attachListener(new metadatacache());