Get a Redis connection

        :return: Redis connection instance
        :rtype: redis.Redis

def __get_connection(self) -> redis.Redis:
        """
        Get a Redis connection

        :return: Redis connection instance
        :rtype: redis.Redis
        """

        if self.__redis_use_socket:
            r = redis.from_url(
                'unix://{:s}?db={:d}'.format(
                    self.__redis_host,
                    self.__redis_db
                )
            )
        else:
            r = redis.from_url(
                'redis://{:s}:{:d}/{:d}'.format(
                    self.__redis_host,
                    self.__redis_port,
                    self.__redis_db
                )
            )

        if BlackRed.Settings.REDIS_AUTH is not None:
            r.execute_command('AUTH {:s}'.format(BlackRed.Settings.REDIS_AUTH))
        return r