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<?php
namespace React\Http\Io;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\UriInterface;
use React\EventLoop\LoopInterface;
use React\Http\Message\Response;
use React\Http\Message\ResponseException;
use React\Http\Message\Uri;
use React\Promise\Deferred;
use React\Promise\Promise;
use React\Promise\PromiseInterface;
use React\Stream\ReadableStreamInterface;
/**
* @internal
*/
class Transaction
{
private $sender;
private $loop;
// context: http.timeout (ini_get('default_socket_timeout'): 60)
private $timeout;
// context: http.follow_location (true)
private $followRedirects = true;
// context: http.max_redirects (10)
private $maxRedirects = 10;
// context: http.ignore_errors (false)
private $obeySuccessCode = true;
private $streaming = false;
private $maximumSize = 16777216; // 16 MiB = 2^24 bytes
public function __construct(Sender $sender, LoopInterface $loop)
{
$this->sender = $sender;
$this->loop = $loop;
}
/**
* @param array $options
* @return self returns new instance, without modifying existing instance
*/
public function withOptions(array $options)
{
$transaction = clone $this;
foreach ($options as $name => $value) {
if (property_exists($transaction, $name)) {
// restore default value if null is given
if ($value === null) {
$default = new self($this->sender, $this->loop);
$value = $default->$name;
}
$transaction->$name = $value;
}
}
return $transaction;
}
public function send(RequestInterface $request)
{
$state = new ClientRequestState();
$deferred = new Deferred(function () use ($state) {
if ($state->pending !== null) {
$state->pending->cancel();
$state->pending = null;
}
});
// use timeout from options or default to PHP's default_socket_timeout (60)
$timeout = (float)($this->timeout !== null ? $this->timeout : ini_get("default_socket_timeout"));
$loop = $this->loop;
$this->next($request, $deferred, $state)->then(
function (ResponseInterface $response) use ($state, $deferred, $loop, &$timeout) {
if ($state->timeout !== null) {
$loop->cancelTimer($state->timeout);
$state->timeout = null;
}
$timeout = -1;
$deferred->resolve($response);
},
function ($e) use ($state, $deferred, $loop, &$timeout) {
if ($state->timeout !== null) {
$loop->cancelTimer($state->timeout);
$state->timeout = null;
}
$timeout = -1;
$deferred->reject($e);
}
);
if ($timeout < 0) {
return $deferred->promise();
}
$body = $request->getBody();
if ($body instanceof ReadableStreamInterface && $body->isReadable()) {
$that = $this;
$body->on('close', function () use ($that, $deferred, $state, &$timeout) {
if ($timeout >= 0) {
$that->applyTimeout($deferred, $state, $timeout);
}
});
} else {
$this->applyTimeout($deferred, $state, $timeout);
}
return $deferred->promise();
}
/**
* @internal
* @param number $timeout
* @return void
*/
public function applyTimeout(Deferred $deferred, ClientRequestState $state, $timeout)
{
$state->timeout = $this->loop->addTimer($timeout, function () use ($timeout, $deferred, $state) {
$deferred->reject(new \RuntimeException(
'Request timed out after ' . $timeout . ' seconds'
));
if ($state->pending !== null) {
$state->pending->cancel();
$state->pending = null;
}
});
}
private function next(RequestInterface $request, Deferred $deferred, ClientRequestState $state)
{
$this->progress('request', array($request));
$that = $this;
++$state->numRequests;
$promise = $this->sender->send($request);
if (!$this->streaming) {
$promise = $promise->then(function ($response) use ($deferred, $state, $that) {
return $that->bufferResponse($response, $deferred, $state);
});
}
$state->pending = $promise;
return $promise->then(
function (ResponseInterface $response) use ($request, $that, $deferred, $state) {
return $that->onResponse($response, $request, $deferred, $state);
}
);
}
/**
* @internal
* @return PromiseInterface Promise<ResponseInterface, Exception>
*/
public function bufferResponse(ResponseInterface $response, Deferred $deferred, ClientRequestState $state)
{
$body = $response->getBody();
$size = $body->getSize();
if ($size !== null && $size > $this->maximumSize) {
$body->close();
return \React\Promise\reject(new \OverflowException(
'Response body size of ' . $size . ' bytes exceeds maximum of ' . $this->maximumSize . ' bytes',
\defined('SOCKET_EMSGSIZE') ? \SOCKET_EMSGSIZE : 90
));
}
// body is not streaming => already buffered
if (!$body instanceof ReadableStreamInterface) {
return \React\Promise\resolve($response);
}
/** @var ?\Closure $closer */
$closer = null;
$maximumSize = $this->maximumSize;
return $state->pending = new Promise(function ($resolve, $reject) use ($body, $maximumSize, $response, &$closer) {
// resolve with current buffer when stream closes successfully
$buffer = '';
$body->on('close', $closer = function () use (&$buffer, $response, $maximumSize, $resolve, $reject) {
$resolve($response->withBody(new BufferedBody($buffer)));
});
// buffer response body data in memory
$body->on('data', function ($data) use (&$buffer, $maximumSize, $body, $closer, $reject) {
$buffer .= $data;
// close stream and reject promise if limit is exceeded
if (isset($buffer[$maximumSize])) {
$buffer = '';
assert($closer instanceof \Closure);
$body->removeListener('close', $closer);
$body->close();
$reject(new \OverflowException(
'Response body size exceeds maximum of ' . $maximumSize . ' bytes',
\defined('SOCKET_EMSGSIZE') ? \SOCKET_EMSGSIZE : 90
));
}
});
// reject buffering if body emits error
$body->on('error', function (\Exception $e) use ($reject) {
$reject(new \RuntimeException(
'Error while buffering response body: ' . $e->getMessage(),
$e->getCode(),
$e
));
});
}, function () use ($body, &$closer) {
// cancelled buffering: remove close handler to avoid resolving, then close and reject
assert($closer instanceof \Closure);
$body->removeListener('close', $closer);
$body->close();
throw new \RuntimeException('Cancelled buffering response body');
});
}
/**
* @internal
* @throws ResponseException
* @return ResponseInterface|PromiseInterface
*/
public function onResponse(ResponseInterface $response, RequestInterface $request, Deferred $deferred, ClientRequestState $state)
{
$this->progress('response', array($response, $request));
// follow 3xx (Redirection) response status codes if Location header is present and not explicitly disabled
// @link https://tools.ietf.org/html/rfc7231#section-6.4
if ($this->followRedirects && ($response->getStatusCode() >= 300 && $response->getStatusCode() < 400) && $response->hasHeader('Location')) {
return $this->onResponseRedirect($response, $request, $deferred, $state);
}
// only status codes 200-399 are considered to be valid, reject otherwise
if ($this->obeySuccessCode && ($response->getStatusCode() < 200 || $response->getStatusCode() >= 400)) {
throw new ResponseException($response);
}
// resolve our initial promise
return $response;
}
/**
* @param ResponseInterface $response
* @param RequestInterface $request
* @param Deferred $deferred
* @param ClientRequestState $state
* @return PromiseInterface
* @throws \RuntimeException
*/
private function onResponseRedirect(ResponseInterface $response, RequestInterface $request, Deferred $deferred, ClientRequestState $state)
{
// resolve location relative to last request URI
$location = Uri::resolve($request->getUri(), new Uri($response->getHeaderLine('Location')));
$request = $this->makeRedirectRequest($request, $location, $response->getStatusCode());
$this->progress('redirect', array($request));
if ($state->numRequests >= $this->maxRedirects) {
throw new \RuntimeException('Maximum number of redirects (' . $this->maxRedirects . ') exceeded');
}
return $this->next($request, $deferred, $state);
}
/**
* @param RequestInterface $request
* @param UriInterface $location
* @param int $statusCode
* @return RequestInterface
* @throws \RuntimeException
*/
private function makeRedirectRequest(RequestInterface $request, UriInterface $location, $statusCode)
{
// Remove authorization if changing hostnames (but not if just changing ports or protocols).
$originalHost = $request->getUri()->getHost();
if ($location->getHost() !== $originalHost) {
$request = $request->withoutHeader('Authorization');
}
$request = $request->withoutHeader('Host')->withUri($location);
if ($statusCode === Response::STATUS_TEMPORARY_REDIRECT || $statusCode === Response::STATUS_PERMANENT_REDIRECT) {
if ($request->getBody() instanceof ReadableStreamInterface) {
throw new \RuntimeException('Unable to redirect request with streaming body');
}
} else {
$request = $request
->withMethod($request->getMethod() === 'HEAD' ? 'HEAD' : 'GET')
->withoutHeader('Content-Type')
->withoutHeader('Content-Length')
->withBody(new BufferedBody(''));
}
return $request;
}
private function progress($name, array $args = array())
{
return;
echo $name;
foreach ($args as $arg) {
echo ' ';
if ($arg instanceof ResponseInterface) {
echo 'HTTP/' . $arg->getProtocolVersion() . ' ' . $arg->getStatusCode() . ' ' . $arg->getReasonPhrase();
} elseif ($arg instanceof RequestInterface) {
echo $arg->getMethod() . ' ' . $arg->getRequestTarget() . ' HTTP/' . $arg->getProtocolVersion();
} else {
echo $arg;
}
}
echo PHP_EOL;
}
}