protected function getMessage($requestId, $timeout)
{
$this->setTimeout($timeout);
$header = $this->readHeaderFromSocket();
if ($requestId != $header['responseTo']) {
throw new \RuntimeException(sprintf('request/cursor mismatch: %d vs %d', $requestId, $header['responseTo']));
}
$data = $this->readFromSocket($header['messageLength'] - Protocol::MSG_HEADER_SIZE);
$header = substr($data, 0, 20);
$vars = unpack('Vflags/V2cursorId/VstartingFrom/VnumberReturned', $header);
$documents = bson_decode_multiple(substr($data, 20));
if ($documents) {
$this->throwExceptionIfError($documents[0]);
} else {
$documents = [];
}
return ['result' => $documents, 'cursorId' => Util::decodeInt64($vars['cursorId1'], $vars['cursorId2']) ?: null, 'start' => $vars['startingFrom'], 'count' => $vars['numberReturned']];
}
