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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\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 function React\Promise\reject; |
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use function React\Promise\resolve; |
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use RingCentral\Psr7\BufferStream; |
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use Throwable; |
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final class CacheMiddleware implements MiddlewareInterface |
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{ |
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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( |
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RequestInterface $request, |
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string $transactionId, |
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array $options = [] |
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): CancellablePromiseInterface { |
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if (!isset($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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$this->cache[$transactionId] = $options[self::class][Options::CACHE]; |
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$this->strategy[$transactionId] = $options[self::class][Options::STRATEGY]; |
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if (!($this->cache[$transactionId] instanceof CacheInterface) || |
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!($this->strategy[$transactionId] instanceof StrategyInterface) |
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) { |
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return resolve($request); |
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} |
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if ($request->getMethod() !== 'GET') { |
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$this->cleanUpTransaction($transactionId); |
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return resolve($request); |
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} |
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$this->request[$transactionId] = $request; |
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$this->key[$transactionId] = CacheKey::create( |
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$this->request[$transactionId]->getUri(), |
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$options[self::class][Options::GLUE] ?? self::DEFAULT_GLUE |
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); |
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return $this->cache[$transactionId]->get( |
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$this->key[$transactionId] |
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)->then(function (string $json) use ($transactionId) { |
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$document = Document::createFromString($json); |
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if ($document->hasExpired()) { |
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$this->cache[$transactionId]->delete($this->key[$transactionId]); |
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return resolve($this->request[$transactionId]); |
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} |
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return reject($document->getResponse()); |
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}, function () use ($transactionId) { |
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return resolve($this->request[$transactionId]); |
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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( |
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ResponseInterface $response, |
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string $transactionId, |
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array $options = [] |
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): CancellablePromiseInterface { |
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if (!isset($this->request[$transactionId]) || |
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!($this->request[$transactionId] instanceof RequestInterface) |
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) { |
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$this->cleanUpTransaction($transactionId); |
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return resolve($response); |
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} |
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$this->store[$transactionId] = $this->strategy[$transactionId]-> |
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decide($this->request[$transactionId], $response); |
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if (!$this->store[$transactionId]) { |
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$this->cleanUpTransaction($transactionId); |
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return resolve($response); |
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} |
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return $this->hasBody($response)->then(function (ResponseInterface $response) use ($transactionId) { |
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$document = Document::createFromResponse( |
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$response, |
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$this->strategy[$transactionId]->determineTtl( |
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$this->request[$transactionId], |
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$response |
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) |
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); |
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$this->cache[$transactionId]->set($this->key[$transactionId], (string)$document); |
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return resolve($document->getResponse()); |
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}, function () use ($response) { |
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return resolve($response); |
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})->always(function () use ($transactionId): void { |
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$this->cleanUpTransaction($transactionId); |
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}); |
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} |
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public function error( |
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Throwable $throwable, |
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string $transactionId, |
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array $options = [] |
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): CancellablePromiseInterface { |
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$this->cleanUpTransaction($transactionId); |
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return reject($throwable); |
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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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1 |
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private function hasBody(ResponseInterface $response): PromiseInterface |
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{ |
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1 |
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if ($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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7 |
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private function cleanUpTransaction(string $transactionId): void |
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{ |
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if (isset($this->cache[$transactionId])) { |
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unset($this->cache[$transactionId]); |
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} |
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if (isset($this->strategy[$transactionId])) { |
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unset($this->strategy[$transactionId]); |
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} |
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if (isset($this->request[$transactionId])) { |
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unset($this->request[$transactionId]); |
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} |
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7 |
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if (isset($this->key[$transactionId])) { |
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unset($this->key[$transactionId]); |
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} |
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7 |
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if (isset($this->store[$transactionId])) { |
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unset($this->store[$transactionId]); |
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} |
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} |
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} |
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php-api-clients /
middleware-cache
