/**
* @param string $key
* @param int $sub
* @return int
* @throws EngineException
*/
public function countDown(string $key, int $sub = 1) : int
{
$value = $this->memcached->decrement($key, $sub, $sub);
if ($value === false || !is_int($value)) {
throw EngineException::ioError(__METHOD__, 'Decrement operation failed on Memcached server');
}
return $value;
}
/**
* @return int|null|string
* @throws EngineException
*/
private function redisResponse()
{
// Get response from stream
$response = fgets($this->socket);
if ($response === false) {
throw EngineException::ioError(__CLASS__, 'Failed to receive response from Redis server');
}
// Prepare response for parsing
$response = trim($response);
$responseType = substr($response, 0, 1);
$data = substr($response, 1);
// Check response
switch ($responseType) {
case "-":
// Error
throw EngineException::ioError(__CLASS__, substr($data, 4));
break;
case "+":
// Simple String
return $data;
case ":":
// Integer
return intval($data);
case "\$":
// Bulk String
$bytes = intval($data);
if ($bytes > 0) {
$data = @stream_get_contents($this->socket, $bytes + 2);
if ($data === false) {
throw EngineException::ioError(__CLASS__, 'Failed to read bulk-string response');
}
return trim($data);
} elseif ($bytes === 0) {
return "";
// Empty String
} elseif ($bytes === -1) {
return null;
// NULL
} else {
throw EngineException::ioError(__CLASS__, 'Unexpected number of bytes to read');
}
break;
}
// Unexpected response from server?
throw EngineException::ioError(__CLASS__, 'Unexpected response from server');
}
