How to get callback when key expires in REDIS

Question

I'm developing application using Bottle. In my registration form, I'm confirming email by mail with a unique key. I'm storing this key in REDIS with expiry of 4 days. If user does not confirm email within 4 days, key gets expired. for this, I want to permanently delete the user entry from my database(mongoDB).

Ofcourse I dont require continous polling to my redis server to check whether key exists or not.

Is there any way to get a callback from Redis??

OR is there any other efficient way?

Tallie

Please see Notification of key expiration in redis python for an up-to-date answer. – Spectroheliograph

Answer 1

This feature implemented in Redis 2.8, read about it here http://redis.io/topics/notifications

Biramous

Answer 2

There are no such callbacks in redis (not that I know of).

I would do it like this:

• when user signs up, put his id into a sorted set where the score is a timestamp (now + 4 days) and member is user id.
• have a periodic job that gets all records from that sorted set where timestamp is in the past.
• loop through those user ids and take actions (if he didn't confirm - delete all user's data).

Ganda

More information in #11810520 – Opprobrium

Great technique, something I will copy if you do not mind ^_^ – Moonshiner