gunicorn fastapi use loguru

[fanmaoyu0871]

I used this command to deploy the fastapi gunicorn main:app -b 0.0.0.0:12000 -w 4 -k uvicorn.workers.UvicornWorker --daemon ，Logoru was used to record HTTP requests and responses, but I found that some logs were not recorded，my loguru config：logger.add("logs/api.log", encoding="utf-8", catch=True, backtrace=True, diagnose=True, enqueue=True, rotation="00:00", retention="20 days", compression="zip")，is -w 4 or -k uvicorn.workers.UvicornWorker has some problems?
use -w 1，it's likely work fine。

[Delgan]

Yes, this is because of the multiple processes started by FastAPI. They won't inherit the logger, therefore the enqueue=True parameter is unfortunately ineffective.

Right now, it's advised to use one unique file per worker, until a new workaround is implemented in Loguru.

[fanmaoyu0871]

How to do it? Can you give me some ideas? Thank you

[Delgan]

Maybe these snippets can help you:

• How to print logs to file tiangolo/fastapi#1276 (comment)
• https://medium.com/1mgofficial/how-to-override-uvicorn-logger-in-fastapi-using-loguru-124133cdcd4e