python - Atomic Redis Operations with JSON

Question

I want to store a fairly complex JSON object in Redis but I can't see how I can make the transaction atomic, since I will have to get, edit, then set. In the time it's taken to edit, another get could have been called elsewhere which will eventually overwrite my data.

I have looked at Pipelines but it doesn't seem they will be useful, because the commands execute at the same time? Not possible to parse/edit before the set?

I also can't find a way to lock the document/hash during this proccess.

question from:https://stackoverflow.com/questions/66055250/atomic-redis-operations-with-json

Answer 1

You have three options here:

1. Use Redis Transactions:

WATCH mykey
GET mykey
// change the JSON
MULTI
SET mykey
EXEC

2. Use Lua Script:

3. Use the Redis Module RedisJSON which supports atomic commands like:

JSON.ARRINSERT & JSON.NUMINCRBY