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<?php |
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namespace BenTools\GuzzleHttp\Middleware; |
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use BenTools\GuzzleHttp\Middleware\Storage\Adapter\ArrayAdapter; |
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use BenTools\GuzzleHttp\Middleware\Storage\Counter; |
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use BenTools\GuzzleHttp\Middleware\Storage\ThrottleStorageInterface; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Log\LoggerInterface; |
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use Psr\Log\LogLevel; |
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use Psr\Log\NullLogger; |
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class ThrottleMiddleware |
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{ |
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/** |
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* @var ThrottleConfiguration[] |
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*/ |
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private $configurations = []; |
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/** |
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* @var ThrottleStorageInterface |
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*/ |
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private $storage; |
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/** |
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* @var LoggerInterface |
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*/ |
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private $logger; |
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/** |
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* @var string |
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*/ |
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private $logLevel; |
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/** |
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* ThrottleMiddleware constructor. |
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* @param ThrottleStorageInterface $storage |
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* @param LoggerInterface|null $logger |
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* @param string $logLevel |
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*/ |
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public function __construct(ThrottleStorageInterface $storage = null, LoggerInterface $logger = null, string $logLevel = LogLevel::INFO) |
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{ |
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$this->storage = $storage ?? new ArrayAdapter(); |
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$this->logger = $logger ?? new NullLogger(); |
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$this->logLevel = $logLevel; |
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} |
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/** |
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* @param ThrottleConfiguration $configuration |
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*/ |
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public function registerConfiguration(ThrottleConfiguration $configuration) |
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{ |
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$this->configurations[$configuration->getStorageKey()] = $configuration; |
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} |
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public function __invoke(callable $handler) |
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{ |
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return function (RequestInterface $request, array $options) use ($handler) { |
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foreach ($this->configurations as $configuration) { |
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if ($configuration->matchRequest($request)) { |
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$this->processConfiguration($configuration); |
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break; |
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} |
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} |
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return $handler($request, $options); |
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}; |
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} |
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private function processConfiguration(ThrottleConfiguration $configuration) |
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{ |
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try { |
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$counter = $this->storage->getCounter($configuration->getStorageKey()); |
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} catch (\TypeError $e) { |
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$counter = new Counter($configuration->getDuration()); |
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} |
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if (!$counter->isExpired()) { |
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if ($counter->count() >= $configuration->getMaxRequests()) { |
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$this->logger->log( |
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$this->logLevel, |
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sprintf( |
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'%d out of %d requests reach. Sleeping %s seconds before trying again...', |
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$counter->count(), |
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$configuration->getMaxRequests(), |
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$counter->getRemainingTime() |
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) |
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); |
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$this->sleep($counter->getRemainingTime()); |
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$this->processConfiguration($configuration); |
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return; |
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} |
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} else { |
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$counter->reset(); |
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} |
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$counter->increment(); |
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$this->storage->saveCounter($configuration->getStorageKey(), $counter, $configuration->getDuration()); |
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} |
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/** |
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* @param float $value |
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*/ |
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private function sleep(float $value) |
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{ |
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$values = explode('.', (string) $value); |
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$seconds = array_shift($values); |
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$milliseconds = array_shift($values); |
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\sleep($seconds); |
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if (null !== $milliseconds) { |
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$milliseconds = ((float) sprintf('0.%s', $milliseconds)) * 1000; |
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usleep($milliseconds * 1000); |
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} |
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} |
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} |
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bpolaszek /
guzzle-throttle-middleware
