import redis
from redis.lock import Lock

from apollo_clear_notifications.constants import APP_NAME, REDIS_LOCK_TTL


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'{APP_NAME}/{key}'


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