coollog.py

coollog.py

import sys


class Logger(object):

    def __init__(self, system):
        self.system = system


    def log(self, format=None, **keywords):
        """
        @param **keywords: The most important stuff@
        @param format: If you want to specify your own format, do so.
        @param event: If you specify an event, it will be formatted in angle
            brackets at the beginning of the line.
        """
        if format is None:
            format = ""
            if "event" in keywords:
                event = keywords.pop("event")
                format += "<%s> " % (event,)
            format += ', '.join("{key}=%({key})s".format(key=key)
                                for key in sorted(keywords))
        log.msg(format=format, system=self.system, **keywords)


    def extendSystem(self, segment):
        return Logger(self.system + "." + segment)


    @classmethod
    def fromModule(klass):
        """
        Use this if you don't want to have to specify system yourself.
        """
        callerModule = sys._getframe(1).f_globals.get("__name__")
        assert callerModule is not None
        return Logger(callerModule)


from twisted.python import log
log.startLogging(sys.stdout)

# myapp/__init__.py
logger = Logger("myapp")

# myapp/main.py
# from myapp import logger
logger.log(event="startup")

# myapp/db.py
#from myapp import logger
logger = logger.extendSystem("db")
logger.log(event="compaction-error", user="radix", dbconn=1)
logger.log(format="I don't know what %(subject)s is doing with %(object)s",
           subject=1, object=2)