117 lines
3.5 KiB
PHP
117 lines
3.5 KiB
PHP
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<?php
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namespace GuzzleHttp;
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use GuzzleHttp\Promise as P;
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use GuzzleHttp\Promise\PromiseInterface;
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use Psr\Http\Message\RequestInterface;
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use Psr\Http\Message\ResponseInterface;
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/**
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* Middleware that retries requests based on the boolean result of
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* invoking the provided "decider" function.
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*
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* @final
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*/
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class RetryMiddleware
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{
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/**
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* @var callable(RequestInterface, array): PromiseInterface
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*/
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private $nextHandler;
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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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* @var callable(int)
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*/
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private $delay;
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/**
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* @param callable $decider Function that accepts the number of retries,
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* a request, [response], and [exception] and
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* returns true if the request is to be
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* retried.
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* @param callable(RequestInterface, array): PromiseInterface $nextHandler Next handler to invoke.
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* @param null|callable(int): int $delay Function that accepts the number of retries
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* and returns the number of
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* milliseconds to delay.
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*/
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public function __construct(callable $decider, callable $nextHandler, callable $delay = null)
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{
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$this->decider = $decider;
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$this->nextHandler = $nextHandler;
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$this->delay = $delay ?: __CLASS__ . '::exponentialDelay';
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}
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/**
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* Default exponential backoff delay function.
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*
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* @return int milliseconds.
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*/
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public static function exponentialDelay(int $retries): int
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{
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return (int) \pow(2, $retries - 1) * 1000;
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}
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public function __invoke(RequestInterface $request, array $options): PromiseInterface
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{
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if (!isset($options['retries'])) {
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$options['retries'] = 0;
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}
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$fn = $this->nextHandler;
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return $fn($request, $options)
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->then(
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$this->onFulfilled($request, $options),
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$this->onRejected($request, $options)
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);
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}
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/**
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* Execute fulfilled closure
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*/
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private function onFulfilled(RequestInterface $request, array $options): callable
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{
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return function ($value) use ($request, $options) {
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if (!($this->decider)(
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$options['retries'],
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$request,
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$value,
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null
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)) {
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return $value;
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}
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return $this->doRetry($request, $options, $value);
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};
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}
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/**
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* Execute rejected closure
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*/
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private function onRejected(RequestInterface $req, array $options): callable
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{
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return function ($reason) use ($req, $options) {
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if (!($this->decider)(
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$options['retries'],
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$req,
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null,
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$reason
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)) {
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return P\Create::rejectionFor($reason);
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}
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return $this->doRetry($req, $options);
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};
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}
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private function doRetry(RequestInterface $request, array $options, ResponseInterface $response = null): PromiseInterface
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{
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$options['delay'] = ($this->delay)(++$options['retries'], $response);
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return $this($request, $options);
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}
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}
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