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<?php |
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namespace BrainExe\Core\Middleware; |
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use BrainExe\Annotations\Annotations\Inject; |
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use BrainExe\Core\Annotations\Middleware; |
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use BrainExe\Core\Traits\CacheTrait; |
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use BrainExe\Core\Traits\LoggerTrait; |
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use DateTime; |
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use Doctrine\Common\Cache\CacheProvider; |
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use Symfony\Component\HttpFoundation\Request; |
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use Symfony\Component\HttpFoundation\Response; |
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use Symfony\Component\Routing\Route; |
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/** |
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* @todo use X-Cache / X-Validate |
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* @todo invalidate |
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* @Middleware("Middleware.Cache") |
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*/ |
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class Cache extends AbstractMiddleware |
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{ |
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use CacheTrait; |
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use LoggerTrait; |
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const DEFAULT_TTL = 60; |
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const PREFIX = 'cache:'; |
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/** |
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* @var string |
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*/ |
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private $cacheKey; |
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/** |
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* @var boolean |
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*/ |
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private $enabled; |
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/** |
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* @Inject("%cache.enabled%") |
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* @param bool $cacheEnabled |
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*/ |
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public function __construct($cacheEnabled) |
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{ |
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$this->enabled = $cacheEnabled; |
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} |
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/** |
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* {@inheritdoc} |
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3 |
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*/ |
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public function processRequest(Request $request, Route $route) |
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{ |
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if (!$this->enabled || !$route->getOption('cache') || !$request->isMethod('GET')) { |
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return null; |
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} |
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2 |
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$this->cacheKey = $this->generateCacheKey($request); |
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2 |
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$cache = $this->getCache(); |
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2 |
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if ($cache->contains($this->cacheKey)) { |
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return $this->handleCached($cache); |
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} |
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1 |
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return null; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function processResponse(Request $request, Response $response) |
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{ |
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if (!$this->cacheKey) { |
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return null; |
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} |
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1 |
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if (!$response->isOk()) { |
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return; |
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} |
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1 |
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$cache = $this->getCache(); |
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1 |
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$this->debug(sprintf('save into cache: %s', $this->cacheKey)); |
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1 |
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$cache->save($this->cacheKey, $response, $this->getTTL()); |
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$this->cacheKey = null; |
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} |
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/** |
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* @param Request $request |
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* @return string |
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*/ |
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private function generateCacheKey(Request $request) |
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{ |
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return self::PREFIX . $request->getRequestUri(); |
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} |
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/** |
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* @param CacheProvider$cache |
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* @return Response |
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*/ |
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private function handleCached(CacheProvider $cache) |
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{ |
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$this->debug(sprintf('fetch from cache: %s', $this->cacheKey)); |
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/** @var Response $response */ |
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$response = $cache->fetch($this->cacheKey); |
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$this->cacheKey = null; |
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1 |
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$ttl = $this->getTTL(); |
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1 |
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$response->headers->set('X-Cache', 'hit'); |
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$response->setMaxAge($ttl); |
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$response->setExpires(new DateTime(sprintf('+%d seconds', $ttl))); |
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return $response; |
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} |
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/** |
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* @return int |
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*/ |
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private function getTTL() |
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{ |
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return self::DEFAULT_TTL; |
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} |
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} |
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brainexe /
core
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TODOcomments that have been left in the code.``TODO``s show that something is left unfinished and should be attended to.