Enhance Redis cluster support

[gafda]

Summary

This adds support for connecting to Redis clusters with TLS authentication, specifically enabling LibreChat to work with Google Memorystore Redis Cluster.
The changes are focused on the api/cache/keyvRedis.js file.

Change Type

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Config Changes

There are two new environment variables:

Key	Type	Description	Example
USE_REDIS_CLUSTER	boolean	Instructs LibreChat to use the Cluster mode to connect to Redis	true
REDIS_CA	string	If set, instruct LibreChat to use TLS with server authentication, using the file set in this variable as a PEM-encoded certificate authority.	/memorystore/ca
REDIS_KEY_PREFIX	string	Default is empty string. If set, all keys will automatically be set with a prefix. It is useful, for example, when more than one different instance of LibreChat with REDIS connection is present in the same environment (ie.: Staging, Stable, ...)	librechat-staging:
REDIS_MAX_LISTENERS	number	Maximum number of event listeners allowed for the Redis client instance. It helps prevent memory leaks by limiting event listeners. If set to 0 (zero) it will be considered limitless. Defaults to 10 if not specified.	10

Testing

Regex testing:

Started a node pod in the cluster via kubectl run --rm -it node-18 --image node:18-bullseye (should have used node-20 but that was what the developer-defined in .devcontainer/Dockerfile so I went with it.

Then attached to that running pod via vscode: https://code.visualstudio.com/docs/devcontainers/attach-container

Checked out the code, defined my .env file (using the deployment env vars where required, like MongoDB or pointing to the RAG API), and used my very own vscode debug file to check my work.

I was able to validate that the object is correctly recognized as a Cluster after creation:

We see the TLS definition there:

After letting the program run for a while and breaking, for instance, in here:

I can now see that the Redis client is in the read status.

Test Configuration:

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• My changes do not introduce new warnings

[github-advanced-security]

ESLint found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.

[gafda]

fixed

[danny-avila]

There are two new environment variables:

Please also update the librechat docs: https://github.com/LibreChat-AI/librechat.ai/blob/main/pages/docs/configuration/dotenv.mdx

[gafda]

Here it is!

Please let us know if you need any changes. :)

[danny-avila]

why is max listeners set to 0?

[gafda]

It was needed for our use case.
Since it differs from the original, I've made it customizable with REDIS_MAX_LISTENERS instead. (Description updated.)

[danny-avila]

please address linting

[gafda]

fixed

[danny-avila]

Thanks, merging here: #5963