Logging does not work before the server starts

[Phawat Suksiriwan]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

My logs are not appearing before the server is started. Access logs and error logs work fine. Logging in route handlers also works fine. It is only in this state that logging does not work.

Code snippet

from sanic import Sanic
from sanic.log import logger

class MyServer(Sanic):
    def __init__(self) -> None:
        super().__init__(
            name="MyServer",
            dumps=orjson.dumps,
            loads=orjson.loads,
        )
        logger.root.debug("Configuration loaded")

        # Other code goes here...

        logger.root.debug("Configured other things")

        self.config.OAS = False
        logger.root.debug("Configured Sanic extensions")

server = MyServer()

if __name__ == "__main__":
    server.run(...)

Output when running:

$ python3 main.py
[2023-06-17 19:43:45 +0700] [46230] [DEBUG] Creating multiprocessing context using 'spawn'
[2023-06-17 19:43:45 +0700] [46230] [DEBUG] Starting a process: Sanic-Server-0-0
[2023-06-17 19:43:45 +0700] [46230] [DEBUG] Starting a process: Sanic-Reloader-0
[2023-06-17 19:43:45 +0700] [46238] [INFO] Sanic Extensions:
[2023-06-17 19:43:45 +0700] [46238] [INFO]   > injection [0 dependencies; 0 constants]
[2023-06-17 19:43:45 +0700] [46238] [INFO]   > http 
[2023-06-17 19:43:45 +0700] [46238] [DEBUG] Process ack: Sanic-Server-0-0 [46238]
[2023-06-17 19:43:45 +0700] [46238] [INFO] Starting worker [46238]

Expected Behavior

I expected the logs to show up on the console.

How do you run Sanic?

As a script (app.run or Sanic.serve)

Operating System

Arch Linux x86_64 6.3.4-arch1-1

Sanic Version

23.3.0

Additional context

No response

[Adam Hopkins]

1. Why are you using the root logger? Sanic exposes its loggers for use if you want, and changes logging defaults for PROD or DEV mode. But, it never touches the root logger. Speaking of which...
2. Unless you are not changing the root logger config somewhere outside your code, it should probably be defaulted to WARNING. Which, I believe is Python's default for the root logger. Therefore, ...
3. Your code should log those lines if you change from debug to warning. Or, alternatively, you can use Sanic's logger and not the root logger. Assuming debug=True (or dev=True), your lines should also be logged.

I do not see how there is a bug here.