#! /usr/bin/env python3
"""
selflogger.py
Written by Geremy Condra
Licensed under GPLv3
Released 27 May 2009
This module contains a simple exception
designed to self-log.
"""
import logging
import traceback
class LoggingError(Exception):
"""Basic logging error"""
# set the logging options
filename = 'log'
datefmt = '%a, %d %b %Y %H:%M:%S'
format = '%(asctime)s %(levelname)-8s %(message)s'
# build the logger
logging.basicConfig(level=logging.DEBUG,
filename=filename,
datefmt=datefmt,
format=format)
# and get a local variable for it
log = logging.getLogger('')
def __init__(self, *args):
# build the message from the user
user_msg = args[0] if args else "An error has occurred"
# get the traceback from the last error if it exists
try: tb = traceback.format_exc()
# otherwise, get the tb prior to this frame and pretend its us
except:
tb = "Traceback (most recent call last):\n"
tb += ''.join(traceback.format_stack()[:-1])
tb += self.__class__.__name__ + ": " + user_msg
tb += '\n'
# build the complete log message
log_msg = user_msg + "\n" + tb
# and log it
self.log.error(log_msg)
# store the args
self.args = args
if __name__ == "__main__":
# example 1: raise it all by itself
raise LoggingError("AIEEE!")
# example 2: using it to log a re-raise
try: dict()[5]
except: raise LoggingError
