/**
* {@inheritdoc}
*/
public function updateMetadata(Response $response, BlockContextInterface $blockContext = null)
{
if ($this->currentTtl === null) {
$this->currentTtl = $response->getTtl();
}
if ($response->isCacheable() !== null && $response->getTtl() < $this->currentTtl) {
$this->currentTtl = $response->getTtl();
}
}
/**
* {@inheritdoc}
*/
public function update(Response $response)
{
// if we have no embedded Response, do nothing
if (0 === $this->embeddedResponses) {
return;
}
// Remove validation related headers in order to avoid browsers using
// their own cache, because some of the response content comes from
// at least one embedded response (which likely has a different caching strategy).
if ($response->isValidateable()) {
$response->setEtag(null);
$response->setLastModified(null);
$this->cacheable = false;
}
if (!$this->cacheable) {
$response->headers->set('Cache-Control', 'no-cache, must-revalidate');
return;
}
$this->ttls[] = $response->getTtl();
$this->maxAges[] = $response->getMaxAge();
if (null !== ($maxAge = min($this->maxAges))) {
$response->setSharedMaxAge($maxAge);
$response->headers->set('Age', $maxAge - min($this->ttls));
}
$response->setMaxAge(0);
}
/**
* @return int
*/
protected function getTtl()
{
if ($this->response === null) {
return null;
}
return $this->response->getTtl();
}
/**
* Adds a Response.
*
* @param Response $response
*/
public function add(Response $response)
{
if ($response->isValidateable()) {
$this->cacheable = false;
} else {
$this->ttls[] = $response->getTtl();
$this->maxAges[] = $response->getMaxAge();
}
}
protected function logResponse(Response $response, Request $request)
{
if ($response->getStatusCode() >= 500) {
$color = LogLevel::ERROR;
} elseif ($response->getStatusCode() >= 400) {
$color = LogLevel::WARNING;
} elseif ($response->getStatusCode() >= 300) {
$color = LogLevel::NOTICE;
} elseif ($response->getStatusCode() >= 200) {
$color = LogLevel::INFO;
} else {
$color = LogLevel::INFO;
}
$msg = 'Response {response_status_code} for "{request_method} {request_uri}"';
$context = array('request_method' => $request->getMethod(), 'request_uri' => $request->getRequestUri(), 'response_status_code' => $response->getStatusCode(), 'response_charset' => $response->getCharset(), 'response_date' => $response->getDate(), 'response_etag' => $response->getEtag(), 'response_expires' => $response->getExpires(), 'response_last_modified' => $response->getLastModified(), 'response_max_age' => $response->getMaxAge(), 'response_protocol_version' => $response->getProtocolVersion(), 'response_ttl' => $response->getTtl(), 'response_vary' => $response->getVary());
$this->logger->log($color, $msg, $context);
}
/**
* This method is responsible to cascade ttl to the parent block.
*
* @param Response $response
* @param BlockContextInterface $blockContext
* @param BlockServiceInterface $service
*
* @return Response
*/
protected function addMetaInformation(Response $response, BlockContextInterface $blockContext, BlockServiceInterface $service)
{
// a response exists, use it
if ($this->lastResponse && $this->lastResponse->isCacheable()) {
$response->setTtl($this->lastResponse->getTtl());
$response->setPublic();
} elseif ($this->lastResponse) {
// not cacheable
$response->setPrivate();
$response->setTtl(0);
$response->headers->removeCacheControlDirective('s-maxage');
$response->headers->removeCacheControlDirective('maxage');
}
// no more children available in the stack, reseting the state object
if (!$blockContext->getBlock()->hasParent()) {
$this->lastResponse = null;
} else {
// contains a parent so storing the response
$this->lastResponse = $response;
}
return $response;
}
public function testGetTtl()
{
$response = new Response();
$this->assertNull($response->getTtl(), '->getTtl() returns null when no Expires or Cache-Control headers are present');
$response = new Response();
$response->headers->set('Expires', $this->createDateTimeOneHourLater()->format(DATE_RFC2822));
$this->assertLessThan(1, 3600 - $response->getTtl(), '->getTtl() uses the Expires header when no max-age is present');
$response = new Response();
$response->headers->set('Expires', $this->createDateTimeOneHourAgo()->format(DATE_RFC2822));
$this->assertLessThan(0, $response->getTtl(), '->getTtl() returns negative values when Expires is in past');
$response = new Response();
$response->headers->set('Expires', $response->getDate()->format(DATE_RFC2822));
$response->headers->set('Age', 0);
$this->assertSame(0, $response->getTtl(), '->getTtl() correctly handles zero');
$response = new Response();
$response->headers->set('Cache-Control', 'max-age=60');
$this->assertLessThan(1, 60 - $response->getTtl(), '->getTtl() uses Cache-Control max-age when present');
}
/**
* Locks a Request during the call to the backend.
*
* @param Request $request A Request instance
* @param Response $entry A Response instance
*
* @return bool true if the cache entry can be returned even if it is staled, false otherwise
*/
protected function lock(Request $request, Response $entry)
{
// try to acquire a lock to call the backend
$lock = $this->store->lock($request);
// there is already another process calling the backend
if (true !== $lock) {
// check if we can serve the stale entry
if (null === ($age = $entry->headers->getCacheControlDirective('stale-while-revalidate'))) {
$age = $this->options['stale_while_revalidate'];
}
if (abs($entry->getTtl()) < $age) {
$this->record($request, 'stale-while-revalidate');
// server the stale response while there is a revalidation
return true;
}
// wait for the lock to be released
$wait = 0;
while ($this->store->isLocked($request) && $wait < 5000000) {
usleep(50000);
$wait += 50000;
}
if ($wait < 2000000) {
// replace the current entry with the fresh one
$new = $this->lookup($request);
$entry->headers = $new->headers;
$entry->setContent($new->getContent());
$entry->setStatusCode($new->getStatusCode());
$entry->setProtocolVersion($new->getProtocolVersion());
foreach ($new->headers->getCookies() as $cookie) {
$entry->headers->setCookie($cookie);
}
} else {
// backend is slow as hell, send a 503 response (to avoid the dog pile effect)
$entry->setStatusCode(503);
$entry->setContent('503 Service Unavailable');
$entry->headers->set('Retry-After', 10);
}
return true;
}
// we have the lock, call the backend
return false;
}
/**
* Forwards the Request to the backend and returns the Response.
*
* @param Request $request A Request instance
* @param Boolean $catch Whether to catch exceptions or not
* @param Response $entry A Response instance (the stale entry if present, null otherwise)
*
* @return Response A Response instance
*/
protected function forward(Request $request, $catch = false, Response $entry = null)
{
if ($this->esi) {
$this->esi->addSurrogateEsiCapability($request);
}
// always a "master" request (as the real master request can be in cache)
$response = $this->kernel->handle($request, HttpKernelInterface::MASTER_REQUEST, $catch);
// FIXME: we probably need to also catch exceptions if raw === true
// we don't implement the stale-if-error on Requests, which is nonetheless part of the RFC
if (null !== $entry && in_array($response->getStatusCode(), array(500, 502, 503, 504))) {
if (null === $age = $entry->headers->getCacheControlDirective('stale-if-error')) {
$age = $this->options['stale_if_error'];
}
if (abs($entry->getTtl()) < $age) {
$this->record($request, 'stale-if-error');
return $entry;
}
}
$this->processResponseBody($request, $response);
return $response;
}
/**
* Forwards the Request to the backend and returns the Response.
*
* @param Request $request A Request instance
* @param Boolean $catch Whether to catch exceptions or not
* @param Response $entry A Response instance (the stale entry if present, null otherwise)
*
* @return Response A Response instance
*/
protected function forward(Request $request, $catch = false, Response $entry = null)
{
if ($this->esi) {
$this->esi->addSurrogateEsiCapability($request);
}
// modify the X-Forwarded-For header if needed
$forwardedFor = $request->headers->get('X-Forwarded-For');
if ($forwardedFor) {
$request->headers->set('X-Forwarded-For', $forwardedFor . ', ' . $request->server->get('REMOTE_ADDR'));
} else {
$request->headers->set('X-Forwarded-For', $request->server->get('REMOTE_ADDR'));
}
// fix the client IP address by setting it to 127.0.0.1 as HttpCache
// is always called from the same process as the backend.
$request->server->set('REMOTE_ADDR', '127.0.0.1');
// always a "master" request (as the real master request can be in cache)
$response = $this->kernel->handle($request, HttpKernelInterface::MASTER_REQUEST, $catch);
// FIXME: we probably need to also catch exceptions if raw === true
// we don't implement the stale-if-error on Requests, which is nonetheless part of the RFC
if (null !== $entry && in_array($response->getStatusCode(), array(500, 502, 503, 504))) {
if (null === ($age = $entry->headers->getCacheControlDirective('stale-if-error'))) {
$age = $this->options['stale_if_error'];
}
if (abs($entry->getTtl()) < $age) {
$this->record($request, 'stale-if-error');
return $entry;
}
}
$this->processResponseBody($request, $response);
return $response;
}
/**
* @param Response $response
* @param Request $request
*
* @return array
*/
protected function createContext(Response $response, Request $request)
{
$context = array('response_status_code' => $response->getStatusCode(), 'response_charset' => $response->getCharset(), 'response_date' => $response->getDate(), 'response_etag' => $response->getEtag(), 'response_expires' => $response->getExpires(), 'response_last_modified' => $response->getLastModified(), 'response_max_age' => $response->getMaxAge(), 'response_protocol_version' => $response->getProtocolVersion(), 'response_ttl' => $response->getTtl(), 'response_vary' => $response->getVary(), 'request_method' => $request->getMethod(), 'request_uri' => $request->getRequestUri(), 'request_route' => $request->attributes->get('_route'), 'response_time' => $this->getTime($request), 'response_memory' => $this->getMemory());
return $context;
}
