How to save the logs with TimedRotatingFileHandler at the specif

ghz 12hours ago ⋅ 1 views

How to save the logs with TimedRotatingFileHandler at the specific hour?

Answer

To save logs with TimedRotatingFileHandler in Python at a specific hour (e.g., every midnight or at a custom time), you can use the TimedRotatingFileHandler and set the interval to 1 with the when='H' parameter. You can then specify the time of day to start the rotation by adjusting the atTime parameter.

Key Points:

  • when='H': This specifies that the rotation happens on an hourly basis.
  • interval=1: This defines the rotation happens once every hour (but you can adjust this if you need a different interval).
  • atTime: You can set this to the specific time you want the log to rotate. For instance, if you want the rotation to happen every midnight, you would set this to datetime.time(0, 0).

Here’s an example:

Example: Rotate Logs at Specific Hour (e.g., Midnight)

In this example, we set the log rotation to occur every day at midnight.

import logging
from logging.handlers import TimedRotatingFileHandler
import datetime

# Create a logger
logger = logging.getLogger('my_logger')
logger.setLevel(logging.DEBUG)

# Set the specific time when you want the log to rotate (midnight in this case)
rotation_time = datetime.time(0, 0)  # Rotate at midnight

# Set up the TimedRotatingFileHandler
handler = TimedRotatingFileHandler(
    'my_log.log',
    when='midnight',    # Rotate at midnight
    interval=1,         # Rotate once a day
    backupCount=7,      # Keep the last 7 log files
    atTime=rotation_time  # Specify the exact time (midnight)
)

# Create a formatter and set it for the handler
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)

# Add the handler to the logger
logger.addHandler(handler)

# Sample logging messages
logger.debug('This is a debug message')
logger.info('This is an info message')
logger.warning('This is a warning message')

Explanation:

  1. when='midnight': This specifies that the log should rotate at midnight.
  2. interval=1: This indicates that the rotation should occur once per day.
  3. backupCount=7: This keeps the last 7 log files (you can adjust this number based on your requirements).
  4. atTime=rotation_time: This specifies that the log rotation should happen exactly at the specified time (rotation_time).

Custom Hour Rotation:

If you want to rotate the log at a custom hour (e.g., 3 PM), you can change the rotation_time to a datetime.time object representing that time:

rotation_time = datetime.time(15, 0)  # Rotate at 3:00 PM

This will rotate the logs every day at 3 PM.

Notes:

  • Ensure that the time zone of your machine or application matches your expectations if you're working across time zones.
  • TimedRotatingFileHandler rotates based on the system time, so be careful if your system time changes (e.g., during daylight savings time changes).
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