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<?php |
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namespace BrainExe\Core\Middleware; |
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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 Symfony\Component\Cache\Adapter\AdapterInterface; |
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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 X-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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* {@inheritdoc} |
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*/ |
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public function processRequest(Request $request, Route $route) |
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{ |
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if (!$route->hasOption('cache') || !$request->isMethod('GET')) { |
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return null; |
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} |
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$cacheKey = $this->generateCacheKey($request); |
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$ttl = $route->getOption('cache'); |
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$cache = $this->getCache(); |
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if ($cache->hasItem($cacheKey)) { |
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return $this->handleCached($cache, $cacheKey, $ttl); |
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} |
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// enable cache for current request. Store response later in given key |
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$request->attributes->set('_cacheKey', $cacheKey); |
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$request->attributes->set('_cacheTTL', $ttl); |
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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 $response) |
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{ |
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if (!$response->isOk()) { |
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return; |
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} |
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$cacheKey = $request->attributes->get('_cacheKey'); |
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$ttl = $request->attributes->get('_cacheTTL'); |
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if (empty($cacheKey)) { |
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return; |
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} |
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$cache = $this->getCache(); |
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$this->info(sprintf('miss: save into cache: %s', $cacheKey), [ |
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'application' => 'cache', |
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'type' => 'miss', |
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'cacheKey' => $cacheKey, |
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'ttl' => $ttl, |
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]); |
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$item = $cache->getItem($cacheKey); |
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$item->set($response); |
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$item->expiresAfter($ttl); |
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$cache->save($item); |
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$response->headers->set('X-Cache', 'miss'); |
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$response->setMaxAge($ttl); |
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$response->setExpires(new DateTime(sprintf('+%d seconds', $ttl))); |
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} |
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/** |
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* @param AdapterInterface $cache |
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* @param string $cacheKey |
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* @param int $ttl |
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* @return Response |
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*/ |
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private function handleCached(AdapterInterface $cache, string $cacheKey, int $ttl) : Response |
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{ |
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$this->info(sprintf('hit: fetch from cache: %s', $cacheKey), [ |
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'application' => 'cache', |
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'type' => 'hit', |
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'cacheKey' => $cacheKey, |
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'ttl' => $ttl, |
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]); |
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/** @var Response $response */ |
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$response = $cache->getItem($cacheKey)->get(); |
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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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* @param Request $request |
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* @return string |
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*/ |
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private function generateCacheKey(Request $request) : string |
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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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brainexe /
core
This check looks
TODOcomments that have been left in the code.``TODO``s show that something is left unfinished and should be attended to.