import redis
from redis.lock import Lock

from config import Config


config = Config()
redis_client = redis.StrictRedis(config.REDIS_HOST, config.REDIS_PORT)


def get_key(key: str) -> str:
    """Compose a Redis key.
    Args:
        key (str): Key.
    Returns:
        str: Complete key constructed by concatenated prefix + key.
    """
    return f"{config.APP_NAME}/{key}"


def get_redis_lock() -> Lock:
    """Get redis lock
    Returns:
        Lock: Redis lock.
    """
    return redis_client.lock(get_key("lock"), timeout=config.REDIS_LOCK_TTL)