Migrate to python logging module with env var control.

[lainedfles]

Pull Request Checklist

• Description: Briefly describe the changes in this pull request.
• Changelog: Ensure a changelog entry following the format of Keep a Changelog is added at the bottom of the PR description.
• Documentation: Have you updated relevant documentation?
• Dependencies: Are there any new dependencies? Have you updated the dependency versions in the documentation?

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Description

Introduce Python logging and migrate all print() statements to it. To mirror current functionality, logging doesn't use a file, only sys.stdout. A global var GLOBAL_LOG_LEVEL and any of following like OLLAMA_LOG_LEVEL=DEBUG can be set: log_sources = ["AUDIO", "CONFIG", "DB", "IMAGES", "LITELLM", "MAIN", "MODELS", "OLLAMA", "OPENAI", "RAG"]. Note that this is additionally beneficial as it affects any 3rd party imports that use the Python logging module including LITELLM.

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Changelog Entry

First commit

Added

• Introduce Python import logging functionality.

Fixed

• Sensitive log items like the POST data and password hash now require DEBUG logging. Default is INFO.

Changed

• Everywhere using print()

Removed

• Replaced print() statements with log. statements.

[tjbck]

Let's take this PR up a notch and include more logging statements where it's needed, contributions welcome!

[lainedfles]

Can you clarify "where it's needed"? Did I miss some print statements? How else can I help? Thanks!

[tjbck]

In my own testing I have been able to use the regular chat functionality with text input just fine, but I hit an issue with the document upload / RAG functionality: on attempting to upload a document I experience a 500 status code from the server but am not clear how I would be able to debug this further short of starting to add debug log statements, track trace output in myself. Am I missing a debug facility I should just turn on?

One comment from: #724

They're really optional and nice-to-haves, so we could merge this PR first and then start adding more logging statements.

[tjbck]

Merging this for now, let's continue our discussion here: #1282 Thanks!