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<?php |
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namespace Http\Client\Common\Plugin; |
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use Http\Client\Common\Deferred; |
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use Http\Client\Common\Plugin; |
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use Http\Client\Exception; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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use Symfony\Component\OptionsResolver\OptionsResolver; |
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/** |
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* Retry the request if an exception is thrown. |
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* |
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* By default will retry only one time. |
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* |
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* @author Joel Wurtz <[email protected]> |
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*/ |
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final class RetryPlugin implements Plugin |
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{ |
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/** |
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* Number of retry before sending an exception. |
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* |
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* @var int |
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*/ |
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private $retry; |
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/** |
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* @var callable |
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*/ |
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private $delay; |
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/** |
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* @var callable |
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*/ |
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private $decider; |
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/** |
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* Store the retry counter for each request. |
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* |
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* @var array |
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*/ |
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private $retryStorage = []; |
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/** |
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* @param array $config { |
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* |
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* @var int $retries Number of retries to attempt if an exception occurs before letting the exception bubble up. |
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* @var callable $decider A callback that gets a request and an exception to decide after a failure whether the request should be retried. |
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* @var callable $delay A callback that gets a request, an exception and the number of retries and returns how many microseconds we should wait before trying again. |
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* } |
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*/ |
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public function __construct(array $config = []) |
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{ |
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$resolver = new OptionsResolver(); |
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$resolver->setDefaults([ |
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'retries' => 1, |
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'decider' => function (RequestInterface $request, Exception $e) { |
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return true; |
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}, |
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'delay' => __CLASS__.'::defaultDelay', |
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]); |
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$resolver->setAllowedTypes('retries', 'int'); |
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$resolver->setAllowedTypes('decider', 'callable'); |
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$resolver->setAllowedTypes('delay', 'callable'); |
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$options = $resolver->resolve($config); |
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$this->retry = $options['retries']; |
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$this->decider = $options['decider']; |
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$this->delay = $options['delay']; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function handleRequest(RequestInterface $request, callable $next, callable $first) |
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{ |
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$chainIdentifier = spl_object_hash((object) $first); |
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$promise = $next($request); |
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$deferred = new Deferred(function () use ($promise) { |
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$promise->wait(false); |
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}); |
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$onFulfilled = function (ResponseInterface $response) use ($chainIdentifier, $deferred) { |
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if (array_key_exists($chainIdentifier, $this->retryStorage)) { |
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unset($this->retryStorage[$chainIdentifier]); |
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} |
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3 |
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$deferred->resolve($response); |
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return $response; |
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}; |
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$onRejected = function (Exception $exception) use ($request, $next, $onFulfilled, &$onRejected, $chainIdentifier, $deferred) { |
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if (!array_key_exists($chainIdentifier, $this->retryStorage)) { |
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$this->retryStorage[$chainIdentifier] = 0; |
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} |
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if ($this->retryStorage[$chainIdentifier] >= $this->retry) { |
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unset($this->retryStorage[$chainIdentifier]); |
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$deferred->reject($exception); |
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throw $exception; |
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} |
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if (!call_user_func($this->decider, $request, $exception)) { |
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throw $exception; |
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} |
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$time = call_user_func($this->delay, $request, $exception, $this->retryStorage[$chainIdentifier]); |
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usleep($time); |
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// Retry in synchrone |
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++$this->retryStorage[$chainIdentifier]; |
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$next($request)->then($onFulfilled, $onRejected); |
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throw $exception; |
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}; |
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$promise->then($onFulfilled, $onRejected); |
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return $deferred; |
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} |
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/** |
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* @param RequestInterface $request |
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* @param Exception $e |
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* @param int $retries The number of retries we made before. First time this get called it will be 0. |
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* |
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* @return int |
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*/ |
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public static function defaultDelay(RequestInterface $request, Exception $e, $retries) |
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{ |
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return pow(2, $retries) * 500000; |
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} |
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} |
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php-http /
client-common
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This check looks from parameters that have been defined for a function or method, but which are not used in the method body.