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' => $vars['numberReturned']];
}
public static function decDocument($data, &$offset)
{
$docLen = Util::unpack('Vlen', $data, $offset, 4)['len'] - 5;
// subtract len. and null-terminator
$document = [];
$parsedLen = 0;
while (0 !== ord($data[$offset])) {
$elmLen = $offset;
$elm = self::decElement($data, $offset);
$parsedLen += $offset - $elmLen;
$document[$elm[0]] = $elm[1];
}
if ($docLen !== $parsedLen) {
throw new \RuntimeException(sprintf('Document length doesn\'t match total size of parsed elements (%d:%d)', $docLen, $parsedLen));
}
$offset++;
// add one byte for document nul-terminator
return $document;
}