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<?php
namespace React\Http\Io;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use React\EventLoop\LoopInterface;
use React\Http\Client\Client as HttpClient;
use React\Promise\PromiseInterface;
use React\Promise\Deferred;
use React\Socket\ConnectorInterface;
use React\Stream\ReadableStreamInterface;
/**
* [Internal] Sends requests and receives responses
*
* The `Sender` is responsible for passing the [`RequestInterface`](#requestinterface) objects to
* the underlying [`HttpClient`](https://github.com/reactphp/http-client) library
* and keeps track of its transmission and converts its reponses back to [`ResponseInterface`](#responseinterface) objects.
*
* It also registers everything with the main [`EventLoop`](https://github.com/reactphp/event-loop#usage)
* and the default [`Connector`](https://github.com/reactphp/socket-client) and [DNS `Resolver`](https://github.com/reactphp/dns).
*
* The `Sender` class mostly exists in order to abstract changes on the underlying
* components away from this package in order to provide backwards and forwards
* compatibility.
*
* @internal You SHOULD NOT rely on this API, it is subject to change without prior notice!
* @see Browser
*/
class Sender
{
/**
* create a new default sender attached to the given event loop
*
* This method is used internally to create the "default sender".
*
* You may also use this method if you need custom DNS or connector
* settings. You can use this method manually like this:
*
* ```php
* $connector = new \React\Socket\Connector(array(), $loop);
* $sender = \React\Http\Io\Sender::createFromLoop($loop, $connector);
* ```
*
* @param LoopInterface $loop
* @param ConnectorInterface|null $connector
* @return self
*/
public static function createFromLoop(LoopInterface $loop, ConnectorInterface $connector)
{
return new self(new HttpClient(new ClientConnectionManager($connector, $loop)));
}
private $http;
/**
* [internal] Instantiate Sender
*
* @param HttpClient $http
* @internal
*/
public function __construct(HttpClient $http)
{
$this->http = $http;
}
/**
*
* @internal
* @param RequestInterface $request
* @return PromiseInterface Promise<ResponseInterface, Exception>
*/
public function send(RequestInterface $request)
{
// support HTTP/1.1 and HTTP/1.0 only, ensured by `Browser` already
assert(\in_array($request->getProtocolVersion(), array('1.0', '1.1'), true));
$body = $request->getBody();
$size = $body->getSize();
if ($size !== null && $size !== 0) {
// automatically assign a "Content-Length" request header if the body size is known and non-empty
$request = $request->withHeader('Content-Length', (string)$size);
} elseif ($size === 0 && \in_array($request->getMethod(), array('POST', 'PUT', 'PATCH'))) {
// only assign a "Content-Length: 0" request header if the body is expected for certain methods
$request = $request->withHeader('Content-Length', '0');
} elseif ($body instanceof ReadableStreamInterface && $size !== 0 && $body->isReadable() && !$request->hasHeader('Content-Length')) {
// use "Transfer-Encoding: chunked" when this is a streaming body and body size is unknown
$request = $request->withHeader('Transfer-Encoding', 'chunked');
} else {
// do not use chunked encoding if size is known or if this is an empty request body
$size = 0;
}
// automatically add `Authorization: Basic …` request header if URL includes `user:pass@host`
if ($request->getUri()->getUserInfo() !== '' && !$request->hasHeader('Authorization')) {
$request = $request->withHeader('Authorization', 'Basic ' . \base64_encode($request->getUri()->getUserInfo()));
}
$requestStream = $this->http->request($request);
$deferred = new Deferred(function ($_, $reject) use ($requestStream) {
// close request stream if request is cancelled
$reject(new \RuntimeException('Request cancelled'));
$requestStream->close();
});
$requestStream->on('error', function($error) use ($deferred) {
$deferred->reject($error);
});
$requestStream->on('response', function (ResponseInterface $response) use ($deferred, $request) {
$deferred->resolve($response);
});
if ($body instanceof ReadableStreamInterface) {
if ($body->isReadable()) {
// length unknown => apply chunked transfer-encoding
if ($size === null) {
$body = new ChunkedEncoder($body);
}
// pipe body into request stream
// add dummy write to immediately start request even if body does not emit any data yet
$body->pipe($requestStream);
$requestStream->write('');
$body->on('close', $close = function () use ($deferred, $requestStream) {
$deferred->reject(new \RuntimeException('Request failed because request body closed unexpectedly'));
$requestStream->close();
});
$body->on('error', function ($e) use ($deferred, $requestStream, $close, $body) {
$body->removeListener('close', $close);
$deferred->reject(new \RuntimeException('Request failed because request body reported an error', 0, $e));
$requestStream->close();
});
$body->on('end', function () use ($close, $body) {
$body->removeListener('close', $close);
});
} else {
// stream is not readable => end request without body
$requestStream->end();
}
} else {
// body is fully buffered => write as one chunk
$requestStream->end((string)$body);
}
return $deferred->promise();
}
}