Python redis get list based on timestamp

Question

I am using a stream and that stream stores data with a timestamp as key, to read it back 10 seconds later (this I am using to send push notifications). I was wondering if I could query redis for a list of timestamps in a specific range.

For example: I have a thread running that will get that data from redis every 10 seconds. Let's say there are 7 new messages placed, that means after 10 seconds I'd like to send 7 new push notifications for the messages that were placed in that time (I will check if they are already read, but that's another case).

Just wondering, I am not familiar with redis at all so I hope anyone knows. I am using this

Pascal Le Merrer · Accepted Answer · 2016-04-20 15:32:44Z

3

You could use a sorted set, in which the score of each member would be the unix timestamp.

To store a new message, use ZADD:

ZADD myzset <timestamp> <data>

Then to get the list of the messages stored since a given time, use ZRANGEBYSCORE:

# return the messages posted since reference_timestamp
ZRANGEBYSCORE myzset <reference_timestamp> +inf

You can delete the messages after they have been sent, using ZREMRANGEBYSCORE

# delete the messages older than reference_timestamp (including those at timestamp)
ZREMRANGEBYSCORE myzset -inf <reference_timestamp>

answered Apr 20, 2016 at 15:32

Pascal Le Merrer

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1 Comment

dnsko Over a year ago

Thanks, this is exactly what I was looking for

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