TimedRotatingFileHandler

TimedRotatingFileHandler

The TimedRotatingFileHandler class, located in the logging.handlers module, supports rotation of disk log files at certain timed intervals.

class logging.handlers.TimedRotatingFileHandler(filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False)

When

You can use the when to specify the type of interval. The list of possible values is below. Note that they are not case sensitive.

Value Type of interval
'S' Seconds
'M' Minutes
'H' Hours
'D' Days
'W0'-'W6' Weekday (0=Monday)
'midnight' Roll over at midnight

When using weekday-based rotation, specify ‘W0’ for Monday, ‘W1’ for Tuesday, and so on up to ‘W6’ for Sunday. In this case, the value passed for interval isn’t used.

When computing the next rollover time for the first time (when the handler is created), the last modification time of an existing log file, or else the current time, is used to compute when the next rotation will occur.

PS: the next rollover time = (last modification time or the current time) + when * interval

LOGGING

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(message)s'
        },
    },
    'handlers': {
        'logit': {
            'level': 'DEBUG',
            'class': 'logging.handlers.TimedRotatingFileHandler',
            'filename': '/tmp/logit.log',
            'when': 'midnight',
            'backupCount': 10,
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'logit': {
            'handlers': ['logit'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
}

Problems

  • Logs missing when host in uwsgi with multiple process

References

[1] [email protected], 15.9. logging.handlers — Logging handlers — 15.9.6. TimedRotatingFileHandler

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