public function parsePlainStream(PromiseInterface $promise)
{
// text/plain
$out = new ReadableStream();
// try to cancel promise once the stream closes
if ($promise instanceof CancellablePromiseInterface) {
$out->on('close', function () use($promise) {
$promise->cancel();
});
}
$promise->then(function ($response) use($out) {
$out->close();
}, function ($error) use($out) {
$out->emit('error', array($error, $out));
$out->close();
}, function ($progress) use($out) {
if (is_array($progress) && isset($progress['responseStream'])) {
$stream = $progress['responseStream'];
/* @var $stream React\Stream\Stream */
// hack to do not buffer stream contents in body
$stream->removeAllListeners('data');
// got a streaming HTTP response => forward each data chunk to the resulting output stream
$stream->on('data', function ($data) use($out) {
$out->emit('data', array($data, $out));
});
}
});
return $out;
}
/**
* Returns a readable JSON stream for the given ResponseInterface
*
* @param PromiseInterface $promise Promise<ResponseInterface>
* @return ReadableStreamInterface
* @uses self::parsePlainSream()
*/
public function parseJsonStream(PromiseInterface $promise)
{
// application/json
$in = $this->parsePlainStream($promise);
$out = new ReadableStream();
// invalid/closing input stream => return closed output stream
if (!$in->isReadable()) {
$out->close();
return $out;
}
// forward each data chunk to the streaming JSON parser
$parser = new StreamingJsonParser();
$in->on('data', function ($data) use($parser, $out) {
$objects = $parser->push($data);
foreach ($objects as $object) {
if (isset($object['error'])) {
$out->emit('error', array(new JsonProgressException($object), $out));
$out->close();
return;
}
$out->emit('progress', array($object, $out));
}
});
// forward error and make sure stream closes
$in->on('error', function ($error) use($out) {
$out->emit('error', array($error, $out));
$out->close();
});
// closing either stream closes the other one
$in->on('close', array($out, 'close'));
$out->on('close', array($in, 'close'));
return $out;
}