/**
* @return array|int|null|string
* @throws UnknownTypeException
* @throws EmptyResponseException
*/
protected function read()
{
if (!($line = $this->Connection->readLine())) {
throw new EmptyResponseException('Empty response. Please, check connection timeout.');
}
$type = $line[0];
$data = substr($line, 1, -2);
if ($type === self::TYPE_BULK_STRINGS) {
$length = (int) $data;
if ($length === -1) {
return null;
}
return substr($this->Connection->read($length + 2), 0, -2);
}
if ($type === self::TYPE_SIMPLE_STRINGS) {
if ($data === 'OK') {
return true;
}
return $data;
}
if ($type === self::TYPE_INTEGERS) {
return (int) $data;
}
if ($type === self::TYPE_ARRAYS) {
$count = (int) $data;
if ($count === -1) {
return null;
}
$array = [];
for ($i = 0; $i < $count; ++$i) {
$array[] = $this->read();
}
return $array;
}
if ($type === self::TYPE_ERRORS) {
return new ErrorResponseException($data);
}
throw new UnknownTypeException('Unknown protocol type ' . $type);
}
