Changed logger to Loguru

[ObadaS]

A brief description of the purpose of the changes contained in this PR.

Changed default logger to Loguru

Made Loguru intercept all logs and colorize them.

Also added an easier way to change logs to DEBUG INFO WARNING etc from the .env file, and made it possible to generate JSON logs with Loguru

The Gunicorn/Uvicorn interception was based on this guide, which I adapted a bit.

I added some new options in the .env file, so a manual intervention is needed to update the local .env file. The default value for those options is INFO and false, so if they don't exist in the .env file, the instance won't have any problems.

# -----------------------------------------------------------------------------
# Logging (Serialized outputs the logs in JSON format)
# -----------------------------------------------------------------------------
LOG_LEVEL=info
SERIALIZED=false

Some images:

Compute worker logs :

Old

New

Django

Old

New

Site worker:

Old

New

An error from the site worker, uploading a submission as a competition bundle

Old

New

And to finish, one screenshot of logs converted to JSON (from the site worker)

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge

[Didayolo]

That is a very good change, thank you.

I think this is a related issue:

• Improve readability of "received run arguments" in compute worker logs #1956

Let's see if it's a change we want too.

[ObadaS]

I will look at Loguru's options to see if it can make some arguments more readable

[Didayolo]

I will look at Loguru's options to see if it can make some arguments more readable

Nice. Otherwise, we can also take inspiration from this fork where this was done:

https://github.com/utkutvskin/codabench/pull/1/files