/**
* Purge a request from the cache storage
*
* @param RequestInterface $request Request to purge
*/
public function purge(RequestInterface $request)
{
// If the request has a cache.purge_methods param, then use that, otherwise use the default known methods
$methods = $request->getParams()->get('cache.purge_methods') ?: array('GET', 'HEAD', 'POST', 'PUT', 'DELETE');
foreach ($methods as $method) {
// Clone the request with each method and clear from the cache
$cloned = RequestFactory::getInstance()->cloneRequestWithMethod($request, $method);
$key = $this->keyProvider->getCacheKey($cloned);
$this->storage->delete($key);
}
}
/**
* If possible, store a response in cache after sending
*
* @param Event $event
*/
public function onRequestSent(Event $event)
{
$request = $event['request'];
$response = $event['response'];
if (isset($this->cached[$request])) {
$cacheKey = $this->cached[$request];
unset($this->cached[$request]);
if ($this->canCache->canCacheResponse($response)) {
$this->storage->cache($cacheKey, $response, $request->getParams()->get('cache.override_ttl') ?: $response->getMaxAge());
}
}
}
/**
* If possible, set a cache response on a cURL exception
*
* @param Event $event
*/
public function onRequestException(Event $event)
{
if (!$event['exception'] instanceof CurlException) {
return;
}
$request = $event['request'];
if (!$this->canCache->canCacheRequest($request)) {
return;
}
$cacheKey = $this->keyProvider->getCacheKey($request);
if ($cachedData = $this->storage->fetch($cacheKey)) {
$response = new Response($cachedData[0], $cachedData[1], $cachedData[2]);
$response->setHeader('Age', time() - strtotime($response->getDate() ?: 'now'));
if (!$this->canResponseSatisfyFailedRequest($request, $response)) {
return;
}
$request->getParams()->set('cache.hit', 'error');
$request->setResponse($response);
$event->stopPropagation();
}
}
/**
* Purge all cache entries for a given URL
*
* @param string $url URL to purge
*/
public function purge($url)
{
// BC compatibility with previous version that accepted a Request object
$url = $url instanceof RequestInterface ? $url->getUrl() : $url;
$this->storage->purge($url);
}