How can I change the debug-level and format for the Quart (i.e. hypercorn) logger?

I'm trying to set the level and format for the loggers used by the Quart module the way I did it successfully for other 'foreign' loggers:

by running basicConfig and implicitly setting up the root-logger or later
by running logging.getLogger("urllib3.connectionpool").setLevel(logging.INFO) to get and modify an existing logger

However those approaches don't work for the loggers spawned by Quart. Neither are those affected by basicConfig nor can I set the level. Output will always look like this:

[2023-07-28 16:17:12 +0200] [1254610] [INFO] Running on http://0.0.0.0:5432 (CTRL + C to quit)

Setting breakpoints in logging/__init__.py let the program break on log messages by hypercorn.error (so it seems to use the same module), but setting the level like this

logging.getLogger("hypercorn.error").setLevel(logging.WARNING)

doesn't have any effect.

The doc says I should use dictConfig, so I've added

dictConfig({
    'version': 1,
    'loggers': {
        'quart.app': {'level': 'ERROR'},
        'hypercorn.error': {'level': 'ERROR'},
    },
})

.. no effect

I found https://github.com/pgjones/hypercorn/issues/120, and tried

logger = logging.getLogger("hypercorn.error")
logger.addHandler(my_own_handler)
logger.setLevel(logging.WARNING)
logger.propagate = False

but also without effect.

What else can I try?

Solution

I had the same issue recently, and it was a real headache to find how to solve it, but here is my solution:

First, for clarity, I defined a function that takes a logger as an input and that patches the logger how I want it.

import logging


def patch_logger(logger_: logging.Logger):
    logger_.handlers = []  # Clear any existing handlers
    logger_.addHandler(file_handler)
    logger_.addHandler(console_handler)
    logger_.propagate = False
    logger_.setLevel(level)
    return logger_

Then later when running my app, I subclassed the HypercornLogger to have it patch its own loggers:

from hypercorn.config import Config
from hypercorn.logging import Logger as HypercornLogger
from hypercorn.asyncio import serve


class CustomLogger(HypercornLogger):
    def __init__(self, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)
        if self.error_logger:
            patch_logger(self.error_logger)
        if self.access_logger:
            patch_logger(self.access_logger)

app_config = Config()
app_config.logger_class = CustomLogger

The patch_logger function can really be anything you want to change to your logger, what I did is just an example.