68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
#!/usr/bin/env python3
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import logging
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from typing import Union, Optional
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Level = int
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LevelIsh = Optional[Union[Level, str]]
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def mklevel(level: LevelIsh) -> Level:
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if level is None:
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return logging.NOTSET
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if isinstance(level, int):
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return level
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return getattr(logging, level.upper())
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_FMT = '{start}[%(levelname)-7s %(asctime)s %(name)s %(filename)s:%(lineno)d]{end} %(message)s'
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_FMT_COLOR = _FMT.format(start='%(color)s', end='%(end_color)s')
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_FMT_NOCOLOR = _FMT.format(start='', end='')
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def setup_logger(logger: logging.Logger, level: Level) -> None:
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try:
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import logzero # type: ignore
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except ModuleNotFoundError:
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import warnings
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warnings.warn("You might want to install 'logzero' for nice colored logs!")
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logger.setLevel(level)
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h = logging.StreamHandler()
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h.setLevel(level)
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h.setFormatter(logging.Formatter(fmt=_FMT_NOCOLOR))
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logger.addHandler(h)
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else:
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formatter = logzero.LogFormatter(
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fmt=_FMT_COLOR,
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datefmt=None, # pass None to prevent logzero from messing with date format
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)
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logzero.setup_logger(logger.name, level=level, formatter=formatter)
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class LazyLogger(logging.Logger):
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# TODO perhaps should use __new__?
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def __new__(cls, name, level: LevelIsh = 'DEBUG'):
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logger = logging.getLogger(name)
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lvl = mklevel(level)
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# this is called prior to all _log calls so makes sense to do it here?
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def isEnabledFor_lazyinit(*args, logger=logger, orig=logger.isEnabledFor, **kwargs):
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att = 'lazylogger_init_done'
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if not getattr(logger, att, False): # init once, if necessary
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setup_logger(logger, level=lvl)
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setattr(logger, att, True)
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return orig(*args, **kwargs)
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logger.isEnabledFor = isEnabledFor_lazyinit # type: ignore[assignment]
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return logger
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def test():
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ll = LazyLogger('test')
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ll.debug('THIS IS DEBUG')
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ll.warning('THIS IS WARNING')
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ll.exception(RuntimeError("oops"))
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if __name__ == '__main__':
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test()
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