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<?php declare(strict_types=1); |
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namespace ApiClients\Middleware\Cache; |
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use ApiClients\Foundation\Middleware\DefaultPriorityTrait; |
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use ApiClients\Foundation\Middleware\MiddlewareInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use React\Cache\CacheInterface; |
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use React\Promise\CancellablePromiseInterface; |
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use React\Promise\PromiseInterface; |
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use RingCentral\Psr7\BufferStream; |
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use function React\Promise\reject; |
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use function React\Promise\resolve; |
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final class CacheMiddleware implements MiddlewareInterface |
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{ |
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use DefaultPriorityTrait; |
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const DEFAULT_GLUE = '/'; |
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/** |
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* @var CacheInterface |
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*/ |
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private $cache; |
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/** |
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* @var string |
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*/ |
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private $key; |
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/** |
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* @var RequestInterface |
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*/ |
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private $request; |
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/** |
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* @var bool |
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*/ |
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private $store = false; |
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/** |
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* @var StrategyInterface |
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*/ |
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private $strategy; |
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/** |
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* @param RequestInterface $request |
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* @param array $options |
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* @return CancellablePromiseInterface |
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*/ |
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public function pre(RequestInterface $request, array $options = []): CancellablePromiseInterface |
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{ |
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if (!isset($options[self::class][Options::CACHE]) || !isset($options[self::class][Options::STRATEGY])) { |
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return resolve($request); |
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} |
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$this->cache = $options[self::class][Options::CACHE]; |
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$this->strategy = $options[self::class][Options::STRATEGY]; |
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if (!($this->cache instanceof CacheInterface) || !($this->strategy instanceof StrategyInterface)) { |
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return resolve($request); |
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} |
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if ($request->getMethod() !== 'GET') { |
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return resolve($request); |
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} |
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$this->request = $request; |
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$this->key = CacheKey::create( |
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$this->request->getUri(), |
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$options[self::class][Options::GLUE] ?? self::DEFAULT_GLUE |
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); |
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return $this->cache->get($this->key)->then(function (string $json) { |
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$document = Document::createFromString($json); |
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if ($document->hasExpired()) { |
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$this->cache->remove($this->key); |
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return resolve($this->request); |
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} |
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return reject($document->getResponse()); |
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}, function () { |
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return resolve($this->request); |
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}); |
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} |
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/** |
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* @param ResponseInterface $response |
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* @param array $options |
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* @return CancellablePromiseInterface |
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*/ |
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public function post(ResponseInterface $response, array $options = []): CancellablePromiseInterface |
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{ |
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if (!($this->request instanceof RequestInterface)) { |
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return resolve($response); |
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} |
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$this->store = $this->strategy->decide($this->request, $response); |
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if (!$this->store) { |
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return resolve($response); |
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} |
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return $this->hasBody($response)->then(function (ResponseInterface $response) { |
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$document = Document::createFromResponse( |
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$response, |
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$this->strategy->determineTtl( |
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$this->request, |
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$response |
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) |
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); |
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$this->cache->set($this->key, (string)$document); |
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return resolve($document->getResponse()); |
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}, function () use ($response) { |
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return resolve($response); |
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}); |
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} |
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/** |
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* @param ResponseInterface $response |
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* @return PromiseInterface |
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*/ |
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protected function hasBody(ResponseInterface $response): PromiseInterface |
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{ |
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if ($response->getBody() instanceof BufferStream) { |
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return resolve($response); |
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} |
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return reject(); |
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} |
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} |
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php-api-clients /
middleware-cache
