Enter 2006 September/Enter 09 2006.iso/Internet/SpamExperts Home 1.1/SpamExperts Home.exe/lib/spamexperts.modules/logging/__init__.pyc

Python Compiled Bytecode | 2006-07-14 | 42.6 KB | 1,402 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.4)

"""
Logging package for Python. Based on PEP 282 and comments thereto in
comp.lang.python, and influenced by Apache's log4j system.

Should work under Python versions >= 1.5.2, except that source line
information is not available unless 'sys._getframe()' is.

Copyright (C) 2001-2004 Vinay Sajip. All Rights Reserved.

To use, simply 'import logging' and log away!
"""
import sys
import os
import types
import time
import string
import cStringIO
import traceback

try:
    import codecs
except ImportError:
    codecs = None


try:
    import thread
    import threading
except ImportError:
    thread = None

__author__ = 'Vinay Sajip <[e-mail]>'
__status__ = 'beta'
__version__ = '0.4.9.7'
__date__ = '07 October 2005'
if hasattr(sys, 'frozen'):
    _srcfile = 'logging%s__init__%s' % (os.sep, __file__[-4:])
elif string.lower(__file__[-4:]) in [
    '.pyc',
    '.pyo']:
    _srcfile = __file__[:-4] + '.py'
else:
    _srcfile = __file__
_srcfile = os.path.normcase(_srcfile)

def currentframe():
    """Return the frame object for the caller's stack frame."""

    try:
        raise Exception
    except:
        return sys.exc_traceback.tb_frame.f_back


if hasattr(sys, '_getframe'):
    currentframe = sys._getframe

_startTime = time.time()
raiseExceptions = 1
CRITICAL = 50
FATAL = CRITICAL
ERROR = 40
WARNING = 30
WARN = WARNING
INFO = 20
DEBUG = 10
NOTSET = 0
_levelNames = {
    CRITICAL: 'CRITICAL',
    ERROR: 'ERROR',
    WARNING: 'WARNING',
    INFO: 'INFO',
    DEBUG: 'DEBUG',
    NOTSET: 'NOTSET',
    'CRITICAL': CRITICAL,
    'ERROR': ERROR,
    'WARN': WARNING,
    'WARNING': WARNING,
    'INFO': INFO,
    'DEBUG': DEBUG,
    'NOTSET': NOTSET }

def getLevelName(level):
    '''
    Return the textual representation of logging level \'level\'.

    If the level is one of the predefined levels (CRITICAL, ERROR, WARNING,
    INFO, DEBUG) then you get the corresponding string. If you have
    associated levels with names using addLevelName then the name you have
    associated with \'level\' is returned.

    If a numeric value corresponding to one of the defined levels is passed
    in, the corresponding string representation is returned.

    Otherwise, the string "Level %s" % level is returned.
    '''
    return _levelNames.get(level, 'Level %s' % level)


def addLevelName(level, levelName):
    """
    Associate 'levelName' with 'level'.

    This is used when converting levels to text during message formatting.
    """
    _acquireLock()

    try:
        _levelNames[level] = levelName
        _levelNames[levelName] = level
    finally:
        _releaseLock()


_lock = None

def _acquireLock():
    '''
    Acquire the module-level lock for serializing access to shared data.

    This should be released with _releaseLock().
    '''
    global _lock
    if not _lock and thread:
        _lock = threading.RLock()

    if _lock:
        _lock.acquire()



def _releaseLock():
    '''
    Release the module-level lock acquired by calling _acquireLock().
    '''
    if _lock:
        _lock.release()



class LogRecord:
    '''
    A LogRecord instance represents an event being logged.

    LogRecord instances are created every time something is logged. They
    contain all the information pertinent to the event being logged. The
    main information passed in is in msg and args, which are combined
    using str(msg) % args to create the message field of the record. The
    record also includes information such as when the record was created,
    the source line where the logging call was made, and any exception
    information to be logged.
    '''

    def __init__(self, name, level, pathname, lineno, msg, args, exc_info):
        '''
        Initialize a logging record with interesting information.
        '''
        ct = time.time()
        self.name = name
        self.msg = msg
        if args and len(args) == 1 and args[0] and type(args[0]) == types.DictType:
            args = args[0]

        self.args = args
        self.levelname = getLevelName(level)
        self.levelno = level
        self.pathname = pathname

        try:
            self.filename = os.path.basename(pathname)
            self.module = os.path.splitext(self.filename)[0]
        except:
            self.filename = pathname
            self.module = 'Unknown module'

        self.exc_info = exc_info
        self.exc_text = None
        self.lineno = lineno
        self.created = ct
        self.msecs = (ct - long(ct)) * 1000
        self.relativeCreated = (self.created - _startTime) * 1000
        if thread:
            self.thread = thread.get_ident()
            self.threadName = threading.currentThread().getName()
        else:
            self.thread = None
            self.threadName = None
        if hasattr(os, 'getpid'):
            self.process = os.getpid()
        else:
            self.process = None


    def __str__(self):
        return '<LogRecord: %s, %s, %s, %s, "%s">' % (self.name, self.levelno, self.pathname, self.lineno, self.msg)


    def getMessage(self):
        '''
        Return the message for this LogRecord.

        Return the message for this LogRecord after merging any user-supplied
        arguments with the message.
        '''
        if not hasattr(types, 'UnicodeType'):
            msg = str(self.msg)
        else:
            msg = self.msg
            if type(msg) not in (types.UnicodeType, types.StringType):

                try:
                    msg = str(self.msg)
                except UnicodeError:
                    msg = self.msg
                except:
                    None<EXCEPTION MATCH>UnicodeError


            None<EXCEPTION MATCH>UnicodeError
        if self.args:
            msg = msg % self.args

        return msg



def makeLogRecord(dict):
    '''
    Make a LogRecord whose attributes are defined by the specified dictionary,
    This function is useful for converting a logging event received over
    a socket connection (which is sent as a dictionary) into a LogRecord
    instance.
    '''
    rv = LogRecord(None, None, '', 0, '', (), None)
    rv.__dict__.update(dict)
    return rv


class Formatter:
    '''
    Formatter instances are used to convert a LogRecord to text.

    Formatters need to know how a LogRecord is constructed. They are
    responsible for converting a LogRecord to (usually) a string which can
    be interpreted by either a human or an external system. The base Formatter
    allows a formatting string to be specified. If none is supplied, the
    default value of "%s(message)\\n" is used.

    The Formatter can be initialized with a format string which makes use of
    knowledge of the LogRecord attributes - e.g. the default value mentioned
    above makes use of the fact that the user\'s message and arguments are pre-
    formatted into a LogRecord\'s message attribute. Currently, the useful
    attributes in a LogRecord are described by:

    %(name)s            Name of the logger (logging channel)
    %(levelno)s         Numeric logging level for the message (DEBUG, INFO,
                        WARNING, ERROR, CRITICAL)
    %(levelname)s       Text logging level for the message ("DEBUG", "INFO",
                        "WARNING", "ERROR", "CRITICAL")
    %(pathname)s        Full pathname of the source file where the logging
                        call was issued (if available)
    %(filename)s        Filename portion of pathname
    %(module)s          Module (name portion of filename)
    %(lineno)d          Source line number where the logging call was issued
                        (if available)
    %(created)f         Time when the LogRecord was created (time.time()
                        return value)
    %(asctime)s         Textual time when the LogRecord was created
    %(msecs)d           Millisecond portion of the creation time
    %(relativeCreated)d Time in milliseconds when the LogRecord was created,
                        relative to the time the logging module was loaded
                        (typically at application startup time)
    %(thread)d          Thread ID (if available)
    %(threadName)s      Thread name (if available)
    %(process)d         Process ID (if available)
    %(message)s         The result of record.getMessage(), computed just as
                        the record is emitted
    '''
    converter = time.localtime

    def __init__(self, fmt = None, datefmt = None):
        '''
        Initialize the formatter with specified format strings.

        Initialize the formatter either with the specified format string, or a
        default as described above. Allow for specialized date formatting with
        the optional datefmt argument (if omitted, you get the ISO8601 format).
        '''
        if fmt:
            self._fmt = fmt
        else:
            self._fmt = '%(message)s'
        self.datefmt = datefmt


    def formatTime(self, record, datefmt = None):
        """
        Return the creation time of the specified LogRecord as formatted text.

        This method should be called from format() by a formatter which
        wants to make use of a formatted time. This method can be overridden
        in formatters to provide for any specific requirement, but the
        basic behaviour is as follows: if datefmt (a string) is specified,
        it is used with time.strftime() to format the creation time of the
        record. Otherwise, the ISO8601 format is used. The resulting
        string is returned. This function uses a user-configurable function
        to convert the creation time to a tuple. By default, time.localtime()
        is used; to change this for a particular formatter instance, set the
        'converter' attribute to a function with the same signature as
        time.localtime() or time.gmtime(). To change it for all formatters,
        for example if you want all logging times to be shown in GMT,
        set the 'converter' attribute in the Formatter class.
        """
        ct = self.converter(record.created)
        if datefmt:
            s = time.strftime(datefmt, ct)
        else:
            t = time.strftime('%Y-%m-%d %H:%M:%S', ct)
            s = '%s,%03d' % (t, record.msecs)
        return s


    def formatException(self, ei):
        '''
        Format and return the specified exception information as a string.

        This default implementation just uses
        traceback.print_exception()
        '''
        sio = cStringIO.StringIO()
        traceback.print_exception(ei[0], ei[1], ei[2], None, sio)
        s = sio.getvalue()
        sio.close()
        if s[-1] == '\n':
            s = s[:-1]

        return s


    def format(self, record):
        '''
        Format the specified record as text.

        The record\'s attribute dictionary is used as the operand to a
        string formatting operation which yields the returned string.
        Before formatting the dictionary, a couple of preparatory steps
        are carried out. The message attribute of the record is computed
        using LogRecord.getMessage(). If the formatting string contains
        "%(asctime)", formatTime() is called to format the event time.
        If there is exception information, it is formatted using
        formatException() and appended to the message.
        '''
        record.message = record.getMessage()
        if string.find(self._fmt, '%(asctime)') >= 0:
            record.asctime = self.formatTime(record, self.datefmt)

        s = self._fmt % record.__dict__
        if record.exc_info:
            if not record.exc_text:
                record.exc_text = self.formatException(record.exc_info)


        if record.exc_text:
            if s[-1] != '\n':
                s = s + '\n'

            s = s + record.exc_text

        return s


_defaultFormatter = Formatter()

class BufferingFormatter:
    '''
    A formatter suitable for formatting a number of records.
    '''

    def __init__(self, linefmt = None):
        '''
        Optionally specify a formatter which will be used to format each
        individual record.
        '''
        if linefmt:
            self.linefmt = linefmt
        else:
            self.linefmt = _defaultFormatter


    def formatHeader(self, records):
        '''
        Return the header string for the specified records.
        '''
        return ''


    def formatFooter(self, records):
        '''
        Return the footer string for the specified records.
        '''
        return ''


    def format(self, records):
        '''
        Format the specified records and return the result as a string.
        '''
        rv = ''
        if len(records) > 0:
            rv = rv + self.formatHeader(records)
            for record in records:
                rv = rv + self.linefmt.format(record)

            rv = rv + self.formatFooter(records)

        return rv



class Filter:
    '''
    Filter instances are used to perform arbitrary filtering of LogRecords.

    Loggers and Handlers can optionally use Filter instances to filter
    records as desired. The base filter class only allows events which are
    below a certain point in the logger hierarchy. For example, a filter
    initialized with "A.B" will allow events logged by loggers "A.B",
    "A.B.C", "A.B.C.D", "A.B.D" etc. but not "A.BB", "B.A.B" etc. If
    initialized with the empty string, all events are passed.
    '''

    def __init__(self, name = ''):
        '''
        Initialize a filter.

        Initialize with the name of the logger which, together with its
        children, will have its events allowed through the filter. If no
        name is specified, allow every event.
        '''
        self.name = name
        self.nlen = len(name)


    def filter(self, record):
        '''
        Determine if the specified record is to be logged.

        Is the specified record to be logged? Returns 0 for no, nonzero for
        yes. If deemed appropriate, the record may be modified in-place.
        '''
        if self.nlen == 0:
            return 1
        elif self.name == record.name:
            return 1
        elif string.find(record.name, self.name, 0, self.nlen) != 0:
            return 0

        return record.name[self.nlen] == '.'



class Filterer:
    '''
    A base class for loggers and handlers which allows them to share
    common code.
    '''

    def __init__(self):
        '''
        Initialize the list of filters to be an empty list.
        '''
        self.filters = []


    def addFilter(self, filter):
        '''
        Add the specified filter to this handler.
        '''
        if filter not in self.filters:
            self.filters.append(filter)



    def removeFilter(self, filter):
        '''
        Remove the specified filter from this handler.
        '''
        if filter in self.filters:
            self.filters.remove(filter)



    def filter(self, record):
        '''
        Determine if a record is loggable by consulting all the filters.

        The default is to allow the record to be logged; any filter can veto
        this and the record is then dropped. Returns a zero value if a record
        is to be dropped, else non-zero.
        '''
        rv = 1
        for f in self.filters:
            if not f.filter(record):
                rv = 0
                break
                continue

        return rv


_handlers = { }
_handlerList = []

class Handler(Filterer):
    """
    Handler instances dispatch logging events to specific destinations.

    The base handler class. Acts as a placeholder which defines the Handler
    interface. Handlers can optionally use Formatter instances to format
    records as desired. By default, no formatter is specified; in this case,
    the 'raw' message as determined by record.message is logged.
    """

    def __init__(self, level = NOTSET):
        '''
        Initializes the instance - basically setting the formatter to None
        and the filter list to empty.
        '''
        Filterer.__init__(self)
        self.level = level
        self.formatter = None
        _acquireLock()

        try:
            _handlers[self] = 1
            _handlerList.insert(0, self)
        finally:
            _releaseLock()

        self.createLock()


    def createLock(self):
        '''
        Acquire a thread lock for serializing access to the underlying I/O.
        '''
        if thread:
            self.lock = threading.RLock()
        else:
            self.lock = None


    def acquire(self):
        '''
        Acquire the I/O thread lock.
        '''
        if self.lock:
            self.lock.acquire()



    def release(self):
        '''
        Release the I/O thread lock.
        '''
        if self.lock:
            self.lock.release()



    def setLevel(self, level):
        '''
        Set the logging level of this handler.
        '''
        self.level = level


    def format(self, record):
        '''
        Format the specified record.

        If a formatter is set, use it. Otherwise, use the default formatter
        for the module.
        '''
        if self.formatter:
            fmt = self.formatter
        else:
            fmt = _defaultFormatter
        return fmt.format(record)


    def emit(self, record):
        '''
        Do whatever it takes to actually log the specified logging record.

        This version is intended to be implemented by subclasses and so
        raises a NotImplementedError.
        '''
        raise NotImplementedError, 'emit must be implemented by Handler subclasses'


    def handle(self, record):
        '''
        Conditionally emit the specified logging record.

        Emission depends on filters which may have been added to the handler.
        Wrap the actual emission of the record with acquisition/release of
        the I/O thread lock. Returns whether the filter passed the record for
        emission.
        '''
        rv = self.filter(record)
        if rv:
            self.acquire()

            try:
                self.emit(record)
            finally:
                self.release()


        return rv


    def setFormatter(self, fmt):
        '''
        Set the formatter for this handler.
        '''
        self.formatter = fmt


    def flush(self):
        '''
        Ensure all logging output has been flushed.

        This version does nothing and is intended to be implemented by
        subclasses.
        '''
        pass


    def close(self):
        '''
        Tidy up any resources used by the handler.

        This version does removes the handler from an internal list
        of handlers which is closed when shutdown() is called. Subclasses
        should ensure that this gets called from overridden close()
        methods.
        '''
        _acquireLock()

        try:
            del _handlers[self]
            _handlerList.remove(self)
        finally:
            _releaseLock()



    def handleError(self, record):
        '''
        Handle errors which occur during an emit() call.

        This method should be called from handlers when an exception is
        encountered during an emit() call. If raiseExceptions is false,
        exceptions get silently ignored. This is what is mostly wanted
        for a logging system - most users will not care about errors in
        the logging system, they are more interested in application errors.
        You could, however, replace this with a custom handler if you wish.
        The record which was being processed is passed in to this method.
        '''
        if raiseExceptions:
            ei = sys.exc_info()
            traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr)
            del ei




class StreamHandler(Handler):
    '''
    A handler class which writes logging records, appropriately formatted,
    to a stream. Note that this class does not close the stream, as
    sys.stdout or sys.stderr may be used.
    '''

    def __init__(self, strm = None):
        '''
        Initialize the handler.

        If strm is not specified, sys.stderr is used.
        '''
        Handler.__init__(self)
        if not strm:
            strm = sys.stderr

        self.stream = strm
        self.formatter = None


    def flush(self):
        '''
        Flushes the stream.
        '''
        self.stream.flush()


    def emit(self, record):
        '''
        Emit a record.

        If a formatter is specified, it is used to format the record.
        The record is then written to the stream with a trailing newline
        [N.B. this may be removed depending on feedback]. If exception
        information is present, it is formatted using
        traceback.print_exception and appended to the stream.
        '''

        try:
            msg = self.format(record)
            fs = '%s\n'
            if not hasattr(types, 'UnicodeType'):
                self.stream.write(fs % msg)
            else:

                try:
                    self.stream.write(fs % msg)
                except UnicodeError:
                    self.stream.write(fs % msg.encode('UTF-8'))

            self.flush()
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            self.handleError(record)




class FileHandler(StreamHandler):
    '''
    A handler class which writes formatted logging records to disk files.
    '''

    def __init__(self, filename, mode = 'a', encoding = None):
        '''
        Open the specified file and use it as the stream for logging.
        '''
        if codecs is None:
            encoding = None

        if encoding is None:
            stream = open(filename, mode)
        else:
            stream = codecs.open(filename, mode, encoding)
        StreamHandler.__init__(self, stream)
        self.baseFilename = os.path.abspath(filename)
        self.mode = mode


    def close(self):
        '''
        Closes the stream.
        '''
        self.flush()
        self.stream.close()
        StreamHandler.close(self)



class PlaceHolder:
    '''
    PlaceHolder instances are used in the Manager logger hierarchy to take
    the place of nodes for which no loggers have been defined. This class is
    intended for internal use only and not as part of the public API.
    '''

    def __init__(self, alogger):
        '''
        Initialize with the specified logger being a child of this placeholder.
        '''
        self.loggerMap = {
            alogger: None }


    def append(self, alogger):
        '''
        Add the specified logger as a child of this placeholder.
        '''
        if not self.loggerMap.has_key(alogger):
            self.loggerMap[alogger] = None



_loggerClass = None

def setLoggerClass(klass):
    '''
    Set the class to be used when instantiating a logger. The class should
    define __init__() such that only a name argument is required, and the
    __init__() should call Logger.__init__()
    '''
    global _loggerClass
    if klass != Logger:
        if not issubclass(klass, Logger):
            raise TypeError, 'logger not derived from logging.Logger: ' + klass.__name__


    _loggerClass = klass


def getLoggerClass():
    '''
    Return the class to be used when instantiating a logger.
    '''
    return _loggerClass


class Manager:
    '''
    There is [under normal circumstances] just one Manager instance, which
    holds the hierarchy of loggers.
    '''

    def __init__(self, rootnode):
        '''
        Initialize the manager with the root node of the logger hierarchy.
        '''
        self.root = rootnode
        self.disable = 0
        self.emittedNoHandlerWarning = 0
        self.loggerDict = { }


    def getLogger(self, name):
        '''
        Get a logger with the specified name (channel name), creating it
        if it doesn\'t yet exist. This name is a dot-separated hierarchical
        name, such as "a", "a.b", "a.b.c" or similar.

        If a PlaceHolder existed for the specified name [i.e. the logger
        didn\'t exist but a child of it did], replace it with the created
        logger and fix up the parent/child references which pointed to the
        placeholder to now point to the logger.
        '''
        rv = None
        _acquireLock()

        try:
            if self.loggerDict.has_key(name):
                rv = self.loggerDict[name]
                if isinstance(rv, PlaceHolder):
                    ph = rv
                    rv = _loggerClass(name)
                    rv.manager = self
                    self.loggerDict[name] = rv
                    self._fixupChildren(ph, rv)
                    self._fixupParents(rv)

            else:
                rv = _loggerClass(name)
                rv.manager = self
                self.loggerDict[name] = rv
                self._fixupParents(rv)
        finally:
            _releaseLock()

        return rv


    def _fixupParents(self, alogger):
        '''
        Ensure that there are either loggers or placeholders all the way
        from the specified logger to the root of the logger hierarchy.
        '''
        name = alogger.name
        i = string.rfind(name, '.')
        rv = None
        while i > 0 and not rv:
            substr = name[:i]
            if not self.loggerDict.has_key(substr):
                self.loggerDict[substr] = PlaceHolder(alogger)
            else:
                obj = self.loggerDict[substr]
                if isinstance(obj, Logger):
                    rv = obj
                elif not isinstance(obj, PlaceHolder):
                    raise AssertionError
                obj.append(alogger)
            i = string.rfind(name, '.', 0, i - 1)
        if not rv:
            rv = self.root

        alogger.parent = rv


    def _fixupChildren(self, ph, alogger):
        '''
        Ensure that children of the placeholder ph are connected to the
        specified logger.
        '''
        for c in ph.loggerMap.keys():
            if string.find(c.parent.name, alogger.name) != 0:
                alogger.parent = c.parent
                c.parent = alogger
                continue




class Logger(Filterer):
    '''
    Instances of the Logger class represent a single logging channel. A
    "logging channel" indicates an area of an application. Exactly how an
    "area" is defined is up to the application developer. Since an
    application can have any number of areas, logging channels are identified
    by a unique string. Application areas can be nested (e.g. an area
    of "input processing" might include sub-areas "read CSV files", "read
    XLS files" and "read Gnumeric files"). To cater for this natural nesting,
    channel names are organized into a namespace hierarchy where levels are
    separated by periods, much like the Java or Python package namespace. So
    in the instance given above, channel names might be "input" for the upper
    level, and "input.csv", "input.xls" and "input.gnu" for the sub-levels.
    There is no arbitrary limit to the depth of nesting.
    '''

    def __init__(self, name, level = NOTSET):
        '''
        Initialize the logger with a name and an optional level.
        '''
        Filterer.__init__(self)
        self.name = name
        self.level = level
        self.parent = None
        self.propagate = 1
        self.handlers = []
        self.disabled = 0


    def setLevel(self, level):
        '''
        Set the logging level of this logger.
        '''
        self.level = level


    def debug(self, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with severity \'DEBUG\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.debug("Houston, we have a %s", "thorny problem", exc_info=1)
        '''
        if self.manager.disable >= DEBUG:
            return None

        if DEBUG >= self.getEffectiveLevel():
            apply(self._log, (DEBUG, msg, args), kwargs)



    def info(self, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with severity \'INFO\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.info("Houston, we have a %s", "interesting problem", exc_info=1)
        '''
        if self.manager.disable >= INFO:
            return None

        if INFO >= self.getEffectiveLevel():
            apply(self._log, (INFO, msg, args), kwargs)



    def warning(self, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with severity \'WARNING\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.warning("Houston, we have a %s", "bit of a problem", exc_info=1)
        '''
        if self.manager.disable >= WARNING:
            return None

        if self.isEnabledFor(WARNING):
            apply(self._log, (WARNING, msg, args), kwargs)


    warn = warning

    def error(self, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with severity \'ERROR\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.error("Houston, we have a %s", "major problem", exc_info=1)
        '''
        if self.manager.disable >= ERROR:
            return None

        if self.isEnabledFor(ERROR):
            apply(self._log, (ERROR, msg, args), kwargs)



    def exception(self, msg, *args):
        '''
        Convenience method for logging an ERROR with exception information.
        '''
        apply(self.error, (msg,) + args, {
            'exc_info': 1 })


    def critical(self, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with severity \'CRITICAL\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.critical("Houston, we have a %s", "major disaster", exc_info=1)
        '''
        if self.manager.disable >= CRITICAL:
            return None

        if CRITICAL >= self.getEffectiveLevel():
            apply(self._log, (CRITICAL, msg, args), kwargs)


    fatal = critical

    def log(self, level, msg, *args, **kwargs):
        '''
        Log \'msg % args\' with the integer severity \'level\'.

        To pass exception information, use the keyword argument exc_info with
        a true value, e.g.

        logger.log(level, "We have a %s", "mysterious problem", exc_info=1)
        '''
        if type(level) != types.IntType:
            if raiseExceptions:
                raise TypeError, 'level must be an integer'
            else:
                return None

        if self.manager.disable >= level:
            return None

        if self.isEnabledFor(level):
            apply(self._log, (level, msg, args), kwargs)



    def findCaller(self):
        '''
        Find the stack frame of the caller so that we can note the source
        file name, line number and function name.
        '''
        f = currentframe().f_back
        rv = ('(unknown file)', 0, '(unknown function)')
        while hasattr(f, 'f_code'):
            co = f.f_code
            filename = os.path.normcase(co.co_filename)
            if filename == _srcfile:
                f = f.f_back
                continue

            rv = (filename, f.f_lineno, co.co_name)
            break
        return rv


    def makeRecord(self, name, level, fn, lno, msg, args, exc_info):
        '''
        A factory method which can be overridden in subclasses to create
        specialized LogRecords.
        '''
        return LogRecord(name, level, fn, lno, msg, args, exc_info)


    def _log(self, level, msg, args, exc_info = None):
        '''
        Low-level logging routine which creates a LogRecord and then calls
        all the handlers of this logger to handle the record.
        '''
        if _srcfile:
            (fn, lno, func) = self.findCaller()
        else:
            (fn, lno, func) = ('(unknown file)', 0, '(unknown function)')
        if exc_info:
            if type(exc_info) != types.TupleType:
                exc_info = sys.exc_info()


        record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info)
        self.handle(record)


    def handle(self, record):
        '''
        Call the handlers for the specified record.

        This method is used for unpickled records received from a socket, as
        well as those created locally. Logger-level filtering is applied.
        '''
        if not (self.disabled) and self.filter(record):
            self.callHandlers(record)



    def addHandler(self, hdlr):
        '''
        Add the specified handler to this logger.
        '''
        if hdlr not in self.handlers:
            self.handlers.append(hdlr)



    def removeHandler(self, hdlr):
        '''
        Remove the specified handler from this logger.
        '''
        if hdlr in self.handlers:
            hdlr.acquire()

            try:
                self.handlers.remove(hdlr)
            finally:
                hdlr.release()




    def callHandlers(self, record):
        '''
        Pass a record to all relevant handlers.

        Loop through all handlers for this logger and its parents in the
        logger hierarchy. If no handler was found, output a one-off error
        message to sys.stderr. Stop searching up the hierarchy whenever a
        logger with the "propagate" attribute set to zero is found - that
        will be the last logger whose handlers are called.
        '''
        c = self
        found = 0
        while c:
            for hdlr in c.handlers:
                found = found + 1
                if record.levelno >= hdlr.level:
                    hdlr.handle(record)
                    continue

            if not c.propagate:
                c = None
                continue
            c = c.parent
        if found == 0 and raiseExceptions and not (self.manager.emittedNoHandlerWarning):
            sys.stderr.write('No handlers could be found for logger "%s"\n' % self.name)
            self.manager.emittedNoHandlerWarning = 1



    def getEffectiveLevel(self):
        '''
        Get the effective level for this logger.

        Loop through this logger and its parents in the logger hierarchy,
        looking for a non-zero logging level. Return the first one found.
        '''
        logger = self
        while logger:
            if logger.level:
                return logger.level

            logger = logger.parent
        return NOTSET


    def isEnabledFor(self, level):
        """
        Is this logger enabled for level 'level'?
        """
        if self.manager.disable >= level:
            return 0

        return level >= self.getEffectiveLevel()



class RootLogger(Logger):
    '''
    A root logger is not that different to any other logger, except that
    it must have a logging level and there is only one instance of it in
    the hierarchy.
    '''

    def __init__(self, level):
        '''
        Initialize the logger with the name "root".
        '''
        Logger.__init__(self, 'root', level)


_loggerClass = Logger
root = RootLogger(WARNING)
Logger.root = root
Logger.manager = Manager(Logger.root)
BASIC_FORMAT = '%(levelname)s:%(name)s:%(message)s'

def basicConfig(**kwargs):
    """
    Do basic configuration for the logging system.

    This function does nothing if the root logger already has handlers
    configured. It is a convenience method intended for use by simple scripts
    to do one-shot configuration of the logging package.

    The default behaviour is to create a StreamHandler which writes to
    sys.stderr, set a formatter using the BASIC_FORMAT format string, and
    add the handler to the root logger.

    A number of optional keyword arguments may be specified, which can alter
    the default behaviour.

    filename  Specifies that a FileHandler be created, using the specified
              filename, rather than a StreamHandler.
    filemode  Specifies the mode to open the file, if filename is specified
              (if filemode is unspecified, it defaults to 'a').
    format    Use the specified format string for the handler.
    datefmt   Use the specified date/time format.
    level     Set the root logger level to the specified level.
    stream    Use the specified stream to initialize the StreamHandler. Note
              that this argument is incompatible with 'filename' - if both
              are present, 'stream' is ignored.

    Note that you could specify a stream created using open(filename, mode)
    rather than passing the filename and mode in. However, it should be
    remembered that StreamHandler does not close its stream (since it may be
    using sys.stdout or sys.stderr), whereas FileHandler closes its stream
    when the handler is closed.
    """
    if len(root.handlers) == 0:
        filename = kwargs.get('filename')
        if filename:
            mode = kwargs.get('filemode', 'a')
            hdlr = FileHandler(filename, mode)
        else:
            stream = kwargs.get('stream')
            hdlr = StreamHandler(stream)
        fs = kwargs.get('format', BASIC_FORMAT)
        dfs = kwargs.get('datefmt', None)
        fmt = Formatter(fs, dfs)
        hdlr.setFormatter(fmt)
        root.addHandler(hdlr)
        level = kwargs.get('level')
        if level:
            root.setLevel(level)




def getLogger(name = None):
    '''
    Return a logger with the specified name, creating it if necessary.

    If no name is specified, return the root logger.
    '''
    if name:
        return Logger.manager.getLogger(name)
    else:
        return root


def critical(msg, *args, **kwargs):
    """
    Log a message with severity 'CRITICAL' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.critical, (msg,) + args, kwargs)

fatal = critical

def error(msg, *args, **kwargs):
    """
    Log a message with severity 'ERROR' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.error, (msg,) + args, kwargs)


def exception(msg, *args):
    """
    Log a message with severity 'ERROR' on the root logger,
    with exception information.
    """
    apply(error, (msg,) + args, {
        'exc_info': 1 })


def warning(msg, *args, **kwargs):
    """
    Log a message with severity 'WARNING' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.warning, (msg,) + args, kwargs)

warn = warning

def info(msg, *args, **kwargs):
    """
    Log a message with severity 'INFO' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.info, (msg,) + args, kwargs)


def debug(msg, *args, **kwargs):
    """
    Log a message with severity 'DEBUG' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.debug, (msg,) + args, kwargs)


def log(level, msg, *args, **kwargs):
    """
    Log 'msg % args' with the integer severity 'level' on the root logger.
    """
    if len(root.handlers) == 0:
        basicConfig()

    apply(root.log, (level, msg) + args, kwargs)


def disable(level):
    """
    Disable all logging calls less severe than 'level'.
    """
    root.manager.disable = level


def shutdown():
    '''
    Perform any cleanup actions in the logging system (e.g. flushing
    buffers).

    Should be called at application exit.
    '''
    for h in _handlerList[:]:

        try:
            h.flush()
            h.close()
        continue
        if raiseExceptions:
            raise





try:
    import atexit
    atexit.register(shutdown)
except ImportError:

    def exithook(status, old_exit = sys.exit):

        try:
            shutdown()
        finally:
            old_exit(status)


    sys.exit = exithook