Redis session dies after idle for redis_strategy

[bert2002]

Hi,
I am using the get_redis_strategy to store the sessions in redis and what I noticed is that after the process is running for some time (hours) and no one logged in/out the redis session times out. When this happens and someone tries to login, the user will see a server error (because the session died) and only after the process restarted, it will work again.

I am using the asyncio like this:

redis = redis.asyncio.from_url(os.getenv("REDIS_URL", None), decode_responses=True, max_connections=10)

async def get_redis_strategy() -> RedisStrategy:
  return RedisStrategy(await redis, lifetime_seconds=86400)

auth_backend = AuthenticationBackend(
  name="cookie",
  transport=cookie_transport,
  get_strategy=get_redis_strategy,
)

Does anyone has a suggestion on how to use a pool that will use a new connection for each get_redis_strategy after a session expired or should I approach this differently?

Thanks,
bert

[frankie567]

I'm surprised you see this kind of errors, since the Redis Py client gracefully handle disconnected connections and automatically reconnects: redis/redis-py#932

Are you sure the error comes from a disconnected connection? Or maybe something in-between (like a network gateway) prevents the client from reconnecting? The exception and stacktrace you're getting could be useful to understand what happens exactly.

Anyway, there is something surprising in the code snippet you shared:

return RedisStrategy(await redis, lifetime_seconds=86400)

the await is not necessary here (maybe harmful?) since redis is a plain Redis object. It should be:

return RedisStrategy(redis, lifetime_seconds=3600)

[bert2002]

Hi @frankie567, just got to it to finally test this and you were right. The await not good. Once I removed it I didn't experience the problem anymore.