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