Creating multiple log files at log rotation time '00:00'

Hi guys!

This is my log_sys.py code:

from loguru import logger

logger.remove()

formato = '{time:YYYY-MM-DD HH:mm:ss.SSSSS!UTC}   {level:15}  {message}  [{file} : {line}]'

logger.add('logs_loguru/loguru_UTC_time_WARNING_{time:YYYY-MM-DD!UTC}.log', rotation='00:00', format=formato, level='WARNING', catch=True)
logger.add('logs_loguru/loguru_UTC_time_DEBUG_{time:YYYY-MM-DD!UTC}.log', rotation='00:00', format=formato, level='DEBUG', catch=True)

It is a web app and is running in a Cloudlinux server. At the time the app was started, two log files were created, as expected: loguru_UTC_time_WARNING_2022-08-23.log loguru_UTC_time_DEBUG_2022-08-23.log

Problem started after a few hours (when the server clock was at 00:00 at the server timezone?). Instead to rotate the files, creating loguru_UTC_time_WARNING_2022-08-24.log and loguru_UTC_time_DEBUG_2022-08-24.log, it started to create many log files, with different file name and overwriting the content of some of them, as you can see in the following image:

File time shown in the image is my local time rather than server time.

I tried to add enqueue=True as logger.add('logs_loguru/loguru_UTC_time_DEBUG_{time:YYYY-MM-DD!UTC}.log', rotation='00:00', format=formato, level='DEBUG', catch=True, enqueue=True) but that leads my web app to freezing/crashing, that seems to be a separated issue.

I could not find a way to set the rotation to UTC time. Can that be the issue?

[sukhoi47]

In recent weeks I am using this code, that is working fine so far.

My server has internal clock set to UTC +02:00. So, by rotating at 02:00 it will be rotating at UTC +00:00 time.

from loguru import logger
from datetime import time, timezone

logger.remove()

formato = '{time:YYYY-MM-DD HH:mm:ss.SSSSS!UTC}   {level:8}  {message}  [{file} : {line}]'

# server internal clock is set to UTC +02:00
logger.add('logs_loguru/loguru_UTC_time_WARNING_{time:YYYY-MM-DD!UTC}.log', rotation='02:00', format=formato, level='WARNING')
logger.add('logs_loguru/loguru_UTC_time_DEBUG_{time:YYYY-MM-DD!UTC}.log', rotation='02:00', format=formato, level='DEBUG')

[Delgan]

Hey @sukhoi47, thanks for the investigations and the reported edge case.

I think you can try using a datetime.time() object with tzinfo set as UTC for rotation:

logger.add(..., rotation=datetime.time(0, 0, 0, tzinfo=datetime.timezone.utc))

May bad it’s not working, I need to address this bug.

Currently, I think you have to implement a custom rotation function or convert your UTC time to local time.