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<?php
namespace Http\Adapter\Guzzle6;
use GuzzleHttp\Exception as GuzzleExceptions;
use GuzzleHttp\Promise\PromiseInterface;
use Http\Adapter\Guzzle6\Exception\UnexpectedValueException;
use Http\Client\Exception as HttplugException;
use Http\Promise\Promise as HttpPromise;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* Wrapper around Guzzle promises.
*
* @author Joel Wurtz <joel.wurtz@gmail.com>
*/
final class Promise implements HttpPromise
{
/**
* @var PromiseInterface
*/
private $promise;
/**
* @var string State of the promise
*/
private $state;
/**
* @var ResponseInterface
*/
private $response;
/**
* @var HttplugException
*/
private $exception;
/**
* @var RequestInterface
*/
private $request;
/**
* @param PromiseInterface $promise
* @param RequestInterface $request
*/
public function __construct(PromiseInterface $promise, RequestInterface $request)
{
$this->request = $request;
$this->state = self::PENDING;
$this->promise = $promise->then(function ($response) {
$this->response = $response;
$this->state = self::FULFILLED;
return $response;
}, function ($reason) use ($request) {
$this->state = self::REJECTED;
if ($reason instanceof HttplugException) {
$this->exception = $reason;
} elseif ($reason instanceof GuzzleExceptions\GuzzleException) {
$this->exception = $this->handleException($reason, $request);
} elseif ($reason instanceof \Throwable) {
$this->exception = new HttplugException\TransferException('Invalid exception returned from Guzzle6', 0, $reason);
} else {
$this->exception = new UnexpectedValueException('Reason returned from Guzzle6 must be an Exception');
}
throw $this->exception;
});
}
/**
* {@inheritdoc}
*/
public function then(callable $onFulfilled = null, callable $onRejected = null)
{
return new static($this->promise->then($onFulfilled, $onRejected), $this->request);
}
/**
* {@inheritdoc}
*/
public function getState()
{
return $this->state;
}
/**
* {@inheritdoc}
*/
public function wait($unwrap = true)
{
$this->promise->wait(false);
if ($unwrap) {
if (self::REJECTED == $this->getState()) {
throw $this->exception;
}
return $this->response;
}
}
/**
* Converts a Guzzle exception into an Httplug exception.
*
* @param GuzzleExceptions\GuzzleException $exception
* @param RequestInterface $request
*
* @return HttplugException
*/
private function handleException(GuzzleExceptions\GuzzleException $exception, RequestInterface $request)
{
if ($exception instanceof GuzzleExceptions\SeekException) {
return new HttplugException\RequestException($exception->getMessage(), $request, $exception);
}
if ($exception instanceof GuzzleExceptions\ConnectException) {
return new HttplugException\NetworkException($exception->getMessage(), $exception->getRequest(), $exception);
}
if ($exception instanceof GuzzleExceptions\RequestException) {
// Make sure we have a response for the HttpException
if ($exception->hasResponse()) {
return new HttplugException\HttpException(
$exception->getMessage(),
$exception->getRequest(),
$exception->getResponse(),
$exception
);
}
return new HttplugException\RequestException($exception->getMessage(), $exception->getRequest(), $exception);
}
return new HttplugException\TransferException($exception->getMessage(), 0, $exception);
}
}