dlogging 0.5

Dynamic logging

Dynamic Logging, dlogging, is a Python library to provide the capability to change logger behaviour at runtime.

Installation

Install using pip:

pip install dlogging

Usage

Example 1 - general logging

Python:

from dlogging import DLogger, FORMATS, Fmt

log1 = DLogger("log1")  # use default logging format, filename
log2 = DLogger("log2", log_fmt=FORMATS[Fmt.FNAME_LINENO_LEVEL])
log3 = DLogger("log3", log_enabled=False, cout_enabled=True)  # log to file disabled

def log_messages():
    log1.info("msg #2")
    log2.info("msg #3")
    log3.error("msg #4") # message not logged to file, but display on stdout

log1.info("msg #1")
log_messages()

By default, messages are logged in logs/app.log

See tests/test_logging.py for more examples

Example 2 - logging override

Python:

import os
import logging
from dlogging import DLogger, LOG_CONF

def write_message(logger: logging.Logger) -> None:
    logger.debug('debug message')
    logger.info('info message')
    logger.warning('warn message')
    logger.error('error message')
    logger.critical('critical message')

def message_count(filename: str) -> int:
    if os.path.exists(filename):
        with open(filename, "r") as f:
            return len(f.readlines())
    return 0

logger = DLogger(name="main", filename="app.log", log_level=logging.INFO)

write_message(logger)  # expect 4 messages written into logs/app.log
assert message_count("logs/app.log") == 4

# override log_level 'logging.INFO' w/ new log level 'logging.WARNING'
LOG_CONF.log_level = logging.WARNING  # set new log_level at LOG_CONF
LOG_CONF.override_logger_settings(True)  # this triggers log_level override

write_message(logger)  # expect 3 messages written into logs/app.log
assert message_count("logs/app.log") == 7  # expect total 7 messages

See tests/test_override.py for more examples

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

License

MIT

MIT License

Copyright (c) 2016 Western Digital Corporation

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.