log.py

"""A simple log mechanism styled after PEP 282."""

# The class here is styled after PEP 282 so that it could later be
# replaced with a standard Python logging implementation.

DEBUG=1
INFO=2
WARN=3
ERROR=4
FATAL=5

importsys

classLog:

def__init__(self, threshold=WARN):
self.threshold=threshold

def_log(self, level, msg, args):
iflevelnotin (DEBUG, INFO, WARN, ERROR, FATAL):
raiseValueError('%s wrong log level'%str(level))

iflevel>=self.threshold:
ifargs:
msg=msg%args
iflevelin (WARN, ERROR, FATAL):
stream=sys.stderr
else:
stream=sys.stdout
try:
stream.write('%s\n'%msg)
exceptUnicodeEncodeError:
# emulate backslashreplace error handler
encoding=stream.encoding
msg=msg.encode(encoding, "backslashreplace").decode(encoding)
stream.write('%s\n'%msg)
stream.flush()

deflog(self, level, msg, *args):
self._log(level, msg, args)

defdebug(self, msg, *args):
self._log(DEBUG, msg, args)

definfo(self, msg, *args):
self._log(INFO, msg, args)

defwarn(self, msg, *args):
self._log(WARN, msg, args)

deferror(self, msg, *args):
self._log(ERROR, msg, args)

deffatal(self, msg, *args):
self._log(FATAL, msg, args)

_global_log=Log()
log=_global_log.log
debug=_global_log.debug
info=_global_log.info
warn=_global_log.warn
error=_global_log.error
fatal=_global_log.fatal

defset_threshold(level):
# return the old threshold for use from tests
old=_global_log.threshold
_global_log.threshold=level
returnold

defset_verbosity(v):
ifv<=0:
set_threshold(WARN)
elifv==1:
set_threshold(INFO)
elifv>=2:
set_threshold(DEBUG)