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<?php |
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/** |
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* @copyright Copyright (c) Flipbox Digital Limited |
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* @license https://github.com/flipbox/relay-stash/blob/master/LICENSE |
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* @link https://github.com/flipbox/relay-stash |
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*/ |
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namespace Flipbox\Relay\Middleware; |
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use Flipbox\Relay\Exceptions\InvalidCachePoolException; |
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use Flipbox\Http\Stream\Factory as StreamFactory; |
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use Psr\Cache\CacheItemPoolInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\StreamInterface; |
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use Stash\Interfaces\ItemInterface; |
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/** |
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* @author Flipbox Factory <[email protected]> |
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* @since 1.0.0 |
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*/ |
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class Cache extends AbstractMiddleware |
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{ |
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/** |
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* @var CacheItemPoolInterface The connection |
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*/ |
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public $pool; |
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/** |
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* @inheritdoc |
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*/ |
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public function init() |
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{ |
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// Parent |
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parent::init(); |
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// Ensure we have a valid pool |
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if (!$this->pool instanceof CacheItemPoolInterface) { |
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throw new InvalidCachePoolException( |
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sprintf( |
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"The class '%s' requires a cache pool that is an instance of '%s', '%s' given.", |
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get_class($this), |
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CacheItemPoolInterface::class, |
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get_class($this->pool) |
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) |
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); |
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} |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function __invoke( |
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RequestInterface $request, |
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ResponseInterface $response, |
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callable $next = null |
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): ResponseInterface { |
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// Do parent (logging) |
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parent::__invoke($request, $response); |
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// Create a cache key |
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$key = $this->getCacheKey($request); |
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/** @var ItemInterface $item */ |
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$item = $this->pool->getItem($key); |
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// If it's cached |
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if ($item->isHit()) { |
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return $this->applyCacheToResponseBody($response, $item); |
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} else { |
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// Log |
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$this->info( |
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"Item not found in Cache. [key: {key}]", |
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[ |
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'key' => $key |
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] |
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); |
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} |
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// Lock item |
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$item->lock(); |
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/** @var ResponseInterface $response */ |
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$response = $next($request, $response); |
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// Only cache successful responses |
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if ($this->isResponseSuccessful($response)) { |
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$this->cacheResponse($response, $item); |
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} else { |
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// Log |
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$this->info( |
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"Did not save to cache because request was unsuccessful.", |
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[ |
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'key' => $key, |
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'statusCode' => $response->getStatusCode() |
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] |
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); |
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} |
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return $response; |
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} |
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/** |
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* @param ResponseInterface $response |
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* @param ItemInterface $item |
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* @return ResponseInterface |
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*/ |
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protected function applyCacheToResponseBody(ResponseInterface $response, ItemInterface $item) |
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{ |
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// Log |
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$this->info( |
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"Item found in Cache. [key: {key}, expires: {expires}]", |
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[ |
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'key' => $item->getKey(), |
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'expires' => $item->getExpiration()->getTimestamp() |
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] |
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); |
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// Add response body |
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return $response->withBody( |
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StreamFactory::create($item->get()) |
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); |
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} |
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/** |
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* @param ResponseInterface $response |
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* @param ItemInterface $item |
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*/ |
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protected function cacheResponse(ResponseInterface $response, ItemInterface $item) |
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{ |
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/** @var StreamInterface $body */ |
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$body = $response->getBody(); |
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// Set cache contents |
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$item->set($body->getContents()); |
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// Save cache item |
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$this->pool->save($item); |
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// Rewind stream |
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$body->rewind(); |
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// Log |
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$this->info( |
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"Save item to Cache. [key: {key}, expires: {expires}]", |
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[ |
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'key' => $item->getKey(), |
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'expires' => $item->getExpiration()->getTimestamp() |
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] |
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); |
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} |
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/** |
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* Returns the id used to cache a request. |
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* |
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* @param RequestInterface $request |
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* |
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* @return string |
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*/ |
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private function getCacheKey(RequestInterface $request): string |
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{ |
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return $request->getMethod() . md5((string)$request->getUri()); |
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} |
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} |
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flipbox /
relay-stash
