Updating env does not update cache on other replicas

[lakhansamani]

Version: 0.22.2

Describe the bug

Current implementation

• On server start persist the current env state in db configured via env var.
• On server start put the env state in-memory for faster access
• 1st scenario helps in configuring env state via dashboard. Though I don't allow updating database related env via dashboard else it will be chicken-egg-problem :-D

There is a problem where updating env via dashboard will also not update the env var cache on other replicas and might require a restart for it.

Steps To Reproduce

Expected behavior

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Additional context

[peter-wd-1]

This seems a lot to implement as far as I understand 🤯
so to update the whole replica's cache (replicas could be more then 3), when one server changes their state one would need to broadcast their state changes and others would've already subscribed the changes. Then this might need sub-pub architecture just for changing cache?

[lakhansamani]

@peter-wd-1 since for the production I have recommended using redis for persisting user sessions. I can leverage that store if available and that can solve the problem.
There would be minor latency added for some API calls, but I think acceptable.

WDYT?

[peter-wd-1]

I think I should look into code to understand how dashboard calls the api. Because some LB like swarm has would redirect next api call to another replica. Could be problematic if one action from dashboard cause multiple transaction. But if all the actions from dashboard are atomic transaction, I don't think there would be a big issue? 🧐

[lakhansamani]

Transactions are atom in nature so we should be fine and if we are using distributed store like redis it should solve this problem

[peter-wd-1]

That's great! Thank you for the clear explanation!

[lakhansamani]

@peter-wd-1 released as part of 0.24.0 and tested here with 2 replicas

https://github.com/lakhansamani/authorizer-with-replicas-test

[peter-wd-1]

Sounds awesome thanks for updating!