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<?php
namespace Http\Client\Curl;
use Http\Client\Exception;
use Http\Promise\Promise;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* Shared promises core.
*
* @license http://opensource.org/licenses/MIT MIT
*
* @author Михаил Красильников <m.krasilnikov@yandex.ru>
*/
class PromiseCore
{
/**
* HTTP request
*
* @var RequestInterface
*/
private $request;
/**
* cURL handle
*
* @var resource
*/
private $handle;
/**
* Response builder
*
* @var ResponseBuilder
*/
private $responseBuilder;
/**
* Promise state
*
* @var string
*/
private $state;
/**
* Exception
*
* @var Exception|null
*/
private $exception = null;
/**
* Functions to call when a response will be available.
*
* @var callable[]
*/
private $onFulfilled = [];
/**
* Functions to call when an error happens.
*
* @var callable[]
*/
private $onRejected = [];
/**
* Create shared core.
*
* @param RequestInterface $request HTTP request
* @param resource $handle cURL handle
* @param ResponseBuilder $responseBuilder
*/
public function __construct(
RequestInterface $request,
$handle,
ResponseBuilder $responseBuilder
) {
assert('is_resource($handle)');
assert('get_resource_type($handle) === "curl"');
$this->request = $request;
$this->handle = $handle;
$this->responseBuilder = $responseBuilder;
$this->state = Promise::PENDING;
}
/**
* Add on fulfilled callback.
*
* @param callable $callback
*/
public function addOnFulfilled(callable $callback)
{
if ($this->getState() === Promise::PENDING) {
$this->onFulfilled[] = $callback;
} elseif ($this->getState() === Promise::FULFILLED) {
$response = call_user_func($callback, $this->responseBuilder->getResponse());
if ($response instanceof ResponseInterface) {
$this->responseBuilder->setResponse($response);
}
}
}
/**
* Add on rejected callback.
*
* @param callable $callback
*/
public function addOnRejected(callable $callback)
{
if ($this->getState() === Promise::PENDING) {
$this->onRejected[] = $callback;
} elseif ($this->getState() === Promise::REJECTED) {
$this->exception = call_user_func($callback, $this->exception);
}
}
/**
* Return cURL handle
*
* @return resource
*/
public function getHandle()
{
return $this->handle;
}
/**
* Get the state of the promise, one of PENDING, FULFILLED or REJECTED.
*
* @return string
*/
public function getState()
{
return $this->state;
}
/**
* Return request
*
* @return RequestInterface
*/
public function getRequest()
{
return $this->request;
}
/**
* Return the value of the promise (fulfilled).
*
* @return ResponseInterface Response Object only when the Promise is fulfilled.
*/
public function getResponse()
{
return $this->responseBuilder->getResponse();
}
/**
* Get the reason why the promise was rejected.
*
* If the exception is an instance of Http\Client\Exception\HttpException it will contain
* the response object with the status code and the http reason.
*
* @return Exception Exception Object only when the Promise is rejected.
*
* @throws \LogicException When the promise is not rejected.
*/
public function getException()
{
if (null === $this->exception) {
throw new \LogicException('Promise is not rejected');
}
return $this->exception;
}
/**
* Fulfill promise.
*/
public function fulfill()
{
$this->state = Promise::FULFILLED;
$response = $this->responseBuilder->getResponse();
try {
$response->getBody()->seek(0);
} catch (\RuntimeException $e) {
$exception = new Exception\TransferException($e->getMessage(), $e->getCode(), $e);
$this->reject($exception);
return;
}
while (count($this->onFulfilled) > 0) {
$callback = array_shift($this->onFulfilled);
$response = call_user_func($callback, $response);
}
if ($response instanceof ResponseInterface) {
$this->responseBuilder->setResponse($response);
}
}
/**
* Reject promise.
*
* @param Exception $exception Reject reason.
*/
public function reject(Exception $exception)
{
$this->exception = $exception;
$this->state = Promise::REJECTED;
while (count($this->onRejected) > 0) {
$callback = array_shift($this->onRejected);
try {
$exception = call_user_func($callback, $this->exception);
$this->exception = $exception;
} catch (Exception $exception) {
$this->exception = $exception;
}
}
}
}
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