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75 lines
1.9 KiB
Python
75 lines
1.9 KiB
Python
"""A simple log mechanism styled after PEP 282."""
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# The class here is styled after PEP 282 so that it could later be
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# replaced with a standard Python logging implementation.
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DEBUG = 1
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INFO = 2
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WARN = 3
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ERROR = 4
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FATAL = 5
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import sys
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class Log:
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def __init__(self, threshold=WARN):
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self.threshold = threshold
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def _log(self, level, msg, args):
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if level not in (DEBUG, INFO, WARN, ERROR, FATAL):
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raise ValueError('%s wrong log level' % str(level))
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if level >= self.threshold:
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if args:
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msg = msg % args
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if level in (WARN, ERROR, FATAL):
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stream = sys.stderr
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else:
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stream = sys.stdout
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if stream.errors == 'strict':
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# emulate backslashreplace error handler
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encoding = stream.encoding
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msg = msg.encode(encoding, "backslashreplace").decode(encoding)
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stream.write('%s\n' % msg)
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stream.flush()
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def log(self, level, msg, *args):
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self._log(level, msg, args)
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def debug(self, msg, *args):
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self._log(DEBUG, msg, args)
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def info(self, msg, *args):
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self._log(INFO, msg, args)
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def warn(self, msg, *args):
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self._log(WARN, msg, args)
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def error(self, msg, *args):
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self._log(ERROR, msg, args)
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def fatal(self, msg, *args):
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self._log(FATAL, msg, args)
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_global_log = Log()
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log = _global_log.log
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debug = _global_log.debug
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info = _global_log.info
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warn = _global_log.warn
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error = _global_log.error
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fatal = _global_log.fatal
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def set_threshold(level):
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# return the old threshold for use from tests
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old = _global_log.threshold
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_global_log.threshold = level
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return old
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def set_verbosity(v):
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if v <= 0:
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set_threshold(WARN)
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elif v == 1:
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set_threshold(INFO)
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elif v >= 2:
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set_threshold(DEBUG)
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