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<?php
declare(strict_types=1);
namespace Http\Client\Common\Plugin;
use Http\Client\Common\Plugin;
use Http\Client\Exception\HttpException;
use Http\Promise\Promise;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
/**
* Retry the request if an exception is thrown.
*
* By default will retry only one time.
*
* @author Joel Wurtz <joel.wurtz@gmail.com>
*/
final class RetryPlugin implements Plugin
{
/**
* Number of retry before sending an exception.
*
* @var int
*/
private $retry;
/**
* @var callable
*/
private $errorResponseDelay;
/**
* @var callable
*/
private $errorResponseDecider;
/**
* @var callable
*/
private $exceptionDecider;
/**
* @var callable
*/
private $exceptionDelay;
/**
* Store the retry counter for each request.
*
* @var array
*/
private $retryStorage = [];
/**
* @param array $config {
*
* @var int $retries Number of retries to attempt if an exception occurs before letting the exception bubble up
* @var callable $error_response_decider A callback that gets a request and response to decide whether the request should be retried
* @var callable $exception_decider A callback that gets a request and an exception to decide after a failure whether the request should be retried
* @var callable $error_response_delay A callback that gets a request and response and the current number of retries and returns how many microseconds we should wait before trying again
* @var callable $exception_delay A callback that gets a request, an exception and the current number of retries and returns how many microseconds we should wait before trying again
* }
*/
public function __construct(array $config = [])
{
$resolver = new OptionsResolver();
$resolver->setDefaults([
'retries' => 1,
'error_response_decider' => function (RequestInterface $request, ResponseInterface $response) {
// do not retry client errors
return $response->getStatusCode() >= 500 && $response->getStatusCode() < 600;
},
'exception_decider' => function (RequestInterface $request, ClientExceptionInterface $e) {
// do not retry client errors
return !$e instanceof HttpException || $e->getCode() >= 500 && $e->getCode() < 600;
},
'error_response_delay' => __CLASS__.'::defaultErrorResponseDelay',
'exception_delay' => __CLASS__.'::defaultExceptionDelay',
]);
$resolver->setAllowedTypes('retries', 'int');
$resolver->setAllowedTypes('error_response_decider', 'callable');
$resolver->setAllowedTypes('exception_decider', 'callable');
$resolver->setAllowedTypes('error_response_delay', 'callable');
$resolver->setAllowedTypes('exception_delay', 'callable');
$options = $resolver->resolve($config);
$this->retry = $options['retries'];
$this->errorResponseDecider = $options['error_response_decider'];
$this->errorResponseDelay = $options['error_response_delay'];
$this->exceptionDecider = $options['exception_decider'];
$this->exceptionDelay = $options['exception_delay'];
}
/**
* {@inheritdoc}
*/
public function handleRequest(RequestInterface $request, callable $next, callable $first): Promise
{
$chainIdentifier = spl_object_hash((object) $first);
return $next($request)->then(function (ResponseInterface $response) use ($request, $next, $first, $chainIdentifier) {
if (!array_key_exists($chainIdentifier, $this->retryStorage)) {
$this->retryStorage[$chainIdentifier] = 0;
}
if ($this->retryStorage[$chainIdentifier] >= $this->retry) {
unset($this->retryStorage[$chainIdentifier]);
return $response;
}
if (call_user_func($this->errorResponseDecider, $request, $response)) {
$time = call_user_func($this->errorResponseDelay, $request, $response, $this->retryStorage[$chainIdentifier]);
$response = $this->retry($request, $next, $first, $chainIdentifier, $time);
}
if (array_key_exists($chainIdentifier, $this->retryStorage)) {
unset($this->retryStorage[$chainIdentifier]);
}
return $response;
}, function (ClientExceptionInterface $exception) use ($request, $next, $first, $chainIdentifier) {
if (!array_key_exists($chainIdentifier, $this->retryStorage)) {
$this->retryStorage[$chainIdentifier] = 0;
}
if ($this->retryStorage[$chainIdentifier] >= $this->retry) {
unset($this->retryStorage[$chainIdentifier]);
throw $exception;
}
if (!call_user_func($this->exceptionDecider, $request, $exception)) {
throw $exception;
}
$time = call_user_func($this->exceptionDelay, $request, $exception, $this->retryStorage[$chainIdentifier]);
return $this->retry($request, $next, $first, $chainIdentifier, $time);
});
}
/**
* @param int $retries The number of retries we made before. First time this get called it will be 0.
*/
public static function defaultErrorResponseDelay(RequestInterface $request, ResponseInterface $response, int $retries): int
{
return pow(2, $retries) * 500000;
}
/**
* @param int $retries The number of retries we made before. First time this get called it will be 0.
*/
public static function defaultExceptionDelay(RequestInterface $request, ClientExceptionInterface $e, int $retries): int
{
return pow(2, $retries) * 500000;
}
/**
* @throws \Exception if retrying returns a failed promise
*/
private function retry(RequestInterface $request, callable $next, callable $first, string $chainIdentifier, int $delay): ResponseInterface
{
usleep($delay);
// Retry synchronously
++$this->retryStorage[$chainIdentifier];
$promise = $this->handleRequest($request, $next, $first);
return $promise->wait();
}
}