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Menda on 02/09/10

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Last Edited at 02/09/10 10:17am

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Singleton Logger (logging)

/ Published in: Python

To use it, just change PATH and LOG_FILENAME in the source so that you save your .log file wherever you want.

Then just do:

foo = Logger("foo")

bar = Logger("bar")

foo.debug("debugging foo :D")

bar.info("informing bar :P")

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# -*- coding: utf-8 -*-
# Copyright (c) 2010 Rafa MuÃ±oz CÃ¡rdenas
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
#   * Neither the name of Pioneers of the Inevitable, Songbird, nor the names
#     of its contributors may be used to endorse or promote products derived
#     from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import os
import logging
import sys

PATH = os.path.join(os.path.expanduser("~"), ".folder")
LOG_FILENAME = os.path.join(PATH, "program.log")

class Singleton(object):
    """
    Singleton interface:
    http://www.python.org/download/releases/2.2.3/descrintro/#__new__
    """
    def __new__(cls, *args, **kwds):
        it = cls.__dict__.get("__it__")
        if it is not None:
            return it
        cls.__it__ = it = object.__new__(cls)
        it.init(*args, **kwds)
        return it

def init(self, *args, **kwds):
        pass

class LoggerManager(Singleton):
    """
    Logger Manager.
    Handles all logging files.
    """
    def init(self):
        self.logger = logging.getLogger()
        handler = None
        if not os.path.isdir(PATH):
            try:
                os.mkdir(PATH) # create dir if it doesn't exist
            except:
                raise IOError("Couldn't create \"" + PATH + "\" folder. Check" \
                              " permissions")
        try:
            handler = logging.FileHandler(LOG_FILENAME, "a")
        except:
            raise IOError("Couldn't create/open file \"" + \
                          LOG_FILENAME + "\". Check permissions.")
        self.logger.setLevel(logging.DEBUG)
        formatter = logging.Formatter("%(asctime)s %(name)s - %(levelname)s - %(message)s")
        handler.setFormatter(formatter)
        self.logger.addHandler(handler)

def debug(self, loggername, msg):
        self.logger = logging.getLogger(loggername)
        self.logger.debug(msg)

def error(self, loggername, msg):
        self.logger = logging.getLogger(loggername)
        self.logger.error(msg)

def info(self, loggername, msg):
        self.logger = logging.getLogger(loggername)
        self.logger.info(msg)

def warning(self, loggername, msg):
        self.logger = logging.getLogger(loggername)
        self.logger.warning(msg)

class Logger(object):
    """
    Logger object.
    """
    def __init__(self, loggername="root"):
        self.lm = LoggerManager() # LoggerManager instance
        self.loggername = loggername # logger name

def debug(self, msg):
        self.lm.debug(self.loggername, msg)

def error(self, msg):
        self.lm.error(self.loggername, msg)

def info(self, msg):
        self.lm.info(self.loggername, msg)

def warning(self, msg):
        self.lm.warning(self.loggername, msg)

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