monokaki 0.1.1

contextual logging library, no patch, no logging module replacement

contextual logging library, no patch, no logging module replacement

features

• structured logging
• contextual logging (via logger.bind)
• (no conflicts (stdlib’s logging module))

example

main.py

from monokaki import basic_config, get_logger
import logging

logger = get_logger(__name__)


def run(log):
    log.info("hello")
    log.debug("hmm..")


def main():
    log = logger.bind(name="foo")
    run(log)
    logger.info("bye")

    # normal stdlib's logger
    normallogger = logging.getLogger("stdlib's")
    normallogger.info("hai")


if __name__ == "__main__":
    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--logging", choices=list(sorted(logging._nameToLevel.keys())), default="INFO"
    )
    args = parser.parse_args()
    basic_config(level=logging._nameToLevel[args.logging])
    main()

$ python examples/readme/main.py
{"level": "INFO", "logger": "__main__", "msg": "hello", "name": "foo", "time": "2017-05-21 16:03:44,306"}
{"level": "INFO", "logger": "__main__", "msg": "bye", "time": "2017-05-21 16:03:44,307"}
INFO:stdlib's:hai

$ python examples/readme/main.py --logging=DEBUG
{"level": "INFO", "logger": "__main__", "msg": "hello", "name": "foo", "time": "2017-05-21 16:03:44,427"}
{"level": "DEBUG", "logger": "__main__", "msg": "hmm..", "name": "foo", "time": "2017-05-21 16:03:44,427"}
{"level": "INFO", "logger": "__main__", "msg": "bye", "time": "2017-05-21 16:03:44,428"}
INFO:stdlib's:hai

output customization

renderer.py

import json
from collections import OrderedDict


def ordered_json_render(data, record, formatter):
    kwargs = OrderedDict()
    # see: https://docs.python.org/3/library/logging.html#formatter-objects
    kwargs["time"] = formatter.formatTime(record)

    # see: https://docs.python.org/3/library/logging.html#logrecord-attributes
    kwargs["level"] = record.levelname
    kwargs["meg"] = record.msg
    kwargs["caller"] = "{}:{}".format(record.pathname, record.lineno)
    kwargs["source"] = record.name

    # support exc_info or stack_info
    if "stack" in data:
        kwargs["stack"] = data["stack"]

    # extra data
    kwargs.update(record.kwargs)
    return json.dumps(kwargs, indent=2)

main.py

from monokaki import get_logger, basic_config
logger = get_logger(__name__)


def main():
    logger.bind(name="foo").info("hello", age=20)
    logger.bind(name="foo").info("bye", age=21)


if __name__ == "__main__":
    import logging
    from renderer import ordered_json_render
    basic_config(level=logging.INFO, renderer=ordered_json_render)
    main()

$ python examples/customize-renderer/main.py
{
  "time": "2017-05-21 16:03:44,645",
  "level": "INFO",
  "meg": "hello",
  "caller": "examples/customize-renderer/main.py:6",
  "source": "__main__",
  "name": "foo",
  "age": 20
}
{
  "time": "2017-05-21 16:03:44,646",
  "level": "INFO",
  "meg": "bye",
  "caller": "examples/customize-renderer/main.py:7",
  "source": "__main__",
  "name": "foo",
  "age": 21
}