# Copyright 2001-2009 by Vinay Sajip. All Rights Reserved.

#

# Permission to use, copy, modify, and distribute this software and its

# documentation for any purpose and without fee is hereby granted,

# provided that the above copyright notice appear in all copies and that

# both that copyright notice and this permission notice appear in

# supporting documentation, and that the name of Vinay Sajip

# not be used in advertising or publicity pertaining to distribution

# of the software without specific, written prior permission.

# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING

# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL

# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR

# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER

# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



"""

Logging package for Python. Based on PEP 282 and comments thereto in

comp.lang.python, and influenced by Apache's log4j system.



Copyright (C) 2001-2009 Vinay Sajip. All Rights Reserved.



To use, simply 'import logging' and log away!

"""



__all__ = ['BASIC_FORMAT', 'BufferingFormatter', 'CRITICAL', 'DEBUG', 'ERROR',

           'FATAL', 'FileHandler', 'Filter', 'Formatter', 'Handler', 'INFO',

           'LogRecord', 'Logger', 'LoggerAdapter', 'NOTSET',

           'StreamHandler', 'WARN', 'WARNING', 'addLevelName', 'basicConfig',

           'critical', 'debug', 'disable', 'error',

           'exception', 'fatal', 'getLevelName', 'getLogger', 'getLoggerClass',

           'info', 'log', 'makeLogRecord', 'setLoggerClass', 'warn', 'warning']



import sys, os, types, time, string, cStringIO, traceback



try:

    import codecs

except ImportError:

    codecs = None



try:

    import thread

    import threading

except ImportError:

    thread = None



__author__  = "Vinay Sajip <vinay_sajip@red-dove.com>"

__status__  = "production"

__version__ = "0.5.0.5"

__date__    = "17 February 2009"



#---------------------------------------------------------------------------

#   Miscellaneous module data

#---------------------------------------------------------------------------



#

# _srcfile is used when walking the stack to check when we've got the first

# caller stack frame.

#

if hasattr(sys, 'frozen'): #support for py2exe

    _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)



# next bit filched from 1.5.2's inspect.py

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 = lambda: sys._getframe(3)

# done filching



# _srcfile is only used in conjunction with sys._getframe().

# To provide compatibility with older versions of Python, set _srcfile

# to None if _getframe() is not available; this value will prevent

# findCaller() from being called.

#if not hasattr(sys, "_getframe"):

#    _srcfile = None



#

#_startTime is used as the base when calculating the relative time of events

#

_startTime = time.time()



#

#raiseExceptions is used to see if exceptions during handling should be

#propagated

#

raiseExceptions = 1



#

# If you don't want threading information in the log, set this to zero

#

logThreads = 1



#

# If you don't want multiprocessing information in the log, set this to zero

#

logMultiprocessing = 1



#

# If you don't want process information in the log, set this to zero

#

logProcesses = 1



#---------------------------------------------------------------------------

#   Level related stuff

#---------------------------------------------------------------------------

#

# Default levels and level names, these can be replaced with any positive set

# of values having corresponding names. There is a pseudo-level, NOTSET, which

# is only really there as a lower limit for user-defined levels. Handlers and

# loggers are initialized with NOTSET so that they will log all messages, even

# at user-defined levels.

#



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:    #unlikely to cause an exception, but you never know...

        _levelNames[level] = levelName

        _levelNames[levelName] = level

    finally:

        _releaseLock()



#---------------------------------------------------------------------------

#   Thread-related stuff

#---------------------------------------------------------------------------



#

#_lock is used to serialize access to shared data structures in this module.

#This needs to be an RLock because fileConfig() creates Handlers and so

#might arbitrary user threads. Since Handler.__init__() updates the shared

#dictionary _handlers, it needs to acquire the lock. But if configuring,

#the lock would already have been acquired - so we need an RLock.

#The same argument applies to Loggers and Manager.loggerDict.

#

_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()



#---------------------------------------------------------------------------

#   The logging record

#---------------------------------------------------------------------------



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, func=None):

        """

        Initialize a logging record with interesting information.

        """

        ct = time.time()

        self.name = name

        self.msg = msg

        #

        # The following statement allows passing of a dictionary as a sole

        # argument, so that you can do something like

        #  logging.debug("a %(a)d b %(b)s", {'a':1, 'b':2})

        # Suggested by Stefan Behnel.

        # Note that without the test for args[0], we get a problem because

        # during formatting, we test to see if the arg is present using

        # 'if self.args:'. If the event being logged is e.g. 'Value is %d'

        # and if the passed arg fails 'if self.args:' then no formatting

        # is done. For example, logger.warn('Value is %d', 0) would log

        # 'Value is %d' instead of 'Value is 0'.

        # For the use case of passing a dictionary, this should not be a

        # problem.

        if args and len(args) == 1 and (

                                        type(args[0]) == types.DictType

                                       ) and args[0]:

            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 (TypeError, ValueError, AttributeError):

            self.filename = pathname

            self.module = "Unknown module"

        self.exc_info = exc_info

        self.exc_text = None      # used to cache the traceback text

        self.lineno = lineno

        self.funcName = func

        self.created = ct

        self.msecs = (ct - long(ct)) * 1000

        self.relativeCreated = (self.created - _startTime) * 1000

        if logThreads and thread:

            self.thread = thread.get_ident()

            self.threadName = threading.current_thread().name

        else:

            self.thread = None

            self.threadName = None

        if not logMultiprocessing:

            self.processName = None

        elif 'multiprocessing' not in sys.modules:

            self.processName = 'MainProcess'

        else:

            self.processName = sys.modules['multiprocessing'].current_process().name

        if logProcesses and 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"): #if no unicode support...

            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      #Defer encoding till later

        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, None)

    rv.__dict__.update(dict)

    return rv



#---------------------------------------------------------------------------

#   Formatter classes and functions

#---------------------------------------------------------------------------



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)

    %(funcName)s        Function name

    %(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:

            # Cache the traceback text to avoid converting it multiple times

            # (it's constant anyway)

            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



#

#   The default formatter to use when no other is specified

#

_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



#---------------------------------------------------------------------------

#   Filter classes and functions

#---------------------------------------------------------------------------



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 not (filter 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

        return rv



#---------------------------------------------------------------------------

#   Handler classes and functions

#---------------------------------------------------------------------------



_handlers = {}  #repository of handlers (for flushing when shutdown called)

_handlerList = [] # added to allow handlers to be removed in reverse of order initialized



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

        #get the module data lock, as we're updating a shared structure.

        _acquireLock()

        try:    #unlikely to raise an exception, but you never know...

            _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.

        """

        #get the module data lock, as we're updating a shared structure.

        _acquireLock()

        try:    #unlikely to raise an exception, but you never know...

            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()

            try:

                traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr)

            except IOError:

                pass    # see issue 5971

            finally:

                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 strm is None:

            strm = sys.stderr

        self.stream = strm



    def flush(self):

        """

        Flushes the stream.

        """

        if self.stream and hasattr(self.stream, "flush"):

            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.  If

        exception information is present, it is formatted using

        traceback.print_exception and appended to the stream.  If the stream

        has an 'encoding' attribute, it is used to encode the message before

        output to the stream.

        """

        try:

            msg = self.format(record)

            stream = self.stream

            fs = "%s\n"

            if not hasattr(types, "UnicodeType"): #if no unicode support...

                stream.write(fs % msg)

            else:

                try:

                    if (isinstance(msg, unicode) and

                        getattr(stream, 'encoding', None)):

                        fs = fs.decode(stream.encoding)

                        try:

                            stream.write(fs % msg)

                        except UnicodeEncodeError:

                            #Printing to terminals sometimes fails. For example,

                            #with an encoding of 'cp1251', the above write will

                            #work if written to a stream opened or wrapped by

                            #the codecs module, but fail when writing to a

                            #terminal even when the codepage is set to cp1251.

                            #An extra encoding step seems to be needed.

                            stream.write((fs % msg).encode(stream.encoding))

                    else:

                        stream.write(fs % msg)

                except UnicodeError:

                    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, delay=0):

        """

        Open the specified file and use it as the stream for logging.

        """

        #keep the absolute path, otherwise derived classes which use this

        #may come a cropper when the current directory changes

        if codecs is None:

            encoding = None

        self.baseFilename = os.path.abspath(filename)

        self.mode = mode

        self.encoding = encoding

        if delay:

            #We don't open the stream, but we still need to call the

            #Handler constructor to set level, formatter, lock etc.

            Handler.__init__(self)

            self.stream = None

        else:

            StreamHandler.__init__(self, self._open())



    def close(self):

        """

        Closes the stream.

        """

        if self.stream:

            self.flush()

            if hasattr(self.stream, "close"):

                self.stream.close()

            StreamHandler.close(self)

            self.stream = None



    def _open(self):

        """

        Open the current base file with the (original) mode and encoding.

        Return the resulting stream.

        """

        if self.encoding is None:

            stream = open(self.baseFilename, self.mode)

        else:

            stream = codecs.open(self.baseFilename, self.mode, self.encoding)

        return stream



    def emit(self, record):

        """

        Emit a record.



        If the stream was not opened because 'delay' was specified in the

        constructor, open it before calling the superclass's emit.

        """

        if self.stream is None:

            self.stream = self._open()

        StreamHandler.emit(self, record)



#---------------------------------------------------------------------------

#   Manager classes and functions

#---------------------------------------------------------------------------



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.loggers = [alogger]

        self.loggerMap = { alogger : None }



    def append(self, alogger):

        """

        Add the specified logger as a child of this placeholder.

        """

        #if alogger not in self.loggers:

        if alogger not in self.loggerMap:

            #self.loggers.append(alogger)

            self.loggerMap[alogger] = None



#

#   Determine which class to use when instantiating loggers.

#

_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__()

    """

    if klass != Logger:

        if not issubclass(klass, Logger):

            raise TypeError, "logger not derived from logging.Logger: " + \

                            klass.__name__

    global _loggerClass

    _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 name in self.loggerDict:

                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 substr not in self.loggerDict:

                self.loggerDict[substr] = PlaceHolder(alogger)

            else:

                obj = self.loggerDict[substr]

                if isinstance(obj, Logger):

                    rv = obj

                else:

                    assert isinstance(obj, PlaceHolder)

                    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.

        """

        name = alogger.name

        namelen = len(name)

        for c in ph.loggerMap.keys():

            #The if means ... if not c.parent.name.startswith(nm)

            #if string.find(c.parent.name, nm) <> 0:

            if c.parent.name[:namelen] != name:

                alogger.parent = c.parent

                c.parent = alogger



#---------------------------------------------------------------------------

#   Logger classes and functions

#---------------------------------------------------------------------------



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.isEnabledFor(DEBUG):

            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.isEnabledFor(INFO):

            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.isEnabledFor(WARNING):

            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.isEnabledFor(ERROR):

            self._log(ERROR, msg, args, **kwargs)



    def exception(self, msg, *args):

        """

        Convenience method for logging an ERROR with exception information.

        """

        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.isEnabledFor(CRITICAL):

            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

        if self.isEnabledFor(level):

            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()

        #On some versions of IronPython, currentframe() returns None if

        #IronPython isn't run with -X:Frames.

        if f is not None:

            f = f.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, func=None, extra=None):

        """

        A factory method which can be overridden in subclasses to create

        specialized LogRecords.

        """

        rv = LogRecord(name, level, fn, lno, msg, args, exc_info, func)

        if extra is not None:

            for key in extra:

                if (key in ["message", "asctime"]) or (key in rv.__dict__):

                    raise KeyError("Attempt to overwrite %r in LogRecord" % key)

                rv.__dict__[key] = extra[key]

        return rv



    def _log(self, level, msg, args, exc_info=None, extra=None):

        """

        Low-level logging routine which creates a LogRecord and then calls

        all the handlers of this logger to handle the record.

        """

        if _srcfile:

            #IronPython doesn't track Python frames, so findCaller throws an

            #exception. We trap it here so that IronPython can use logging.

            try:

                fn, lno, func = self.findCaller()

            except ValueError:

                fn, lno, func = "(unknown file)", 0, "(unknown function)"

        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, func, extra)

        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 not (hdlr in self.handlers):

            self.handlers.append(hdlr)



    def removeHandler(self, hdlr):

        """

        Remove the specified handler from this logger.

        """

        if hdlr in self.handlers:

            #hdlr.close()

            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)

            if not c.propagate:

                c = None    #break out

            else:

                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



class LoggerAdapter:

    """

    An adapter for loggers which makes it easier to specify contextual

    information in logging output.

    """



    def __init__(self, logger, extra):

        """

        Initialize the adapter with a logger and a dict-like object which

        provides contextual information. This constructor signature allows

        easy stacking of LoggerAdapters, if so desired.



        You can effectively pass keyword arguments as shown in the

        following example:



        adapter = LoggerAdapter(someLogger, dict(p1=v1, p2="v2"))

        """

        self.logger = logger

        self.extra = extra



    def process(self, msg, kwargs):

        """

        Process the logging message and keyword arguments passed in to

        a logging call to insert contextual information. You can either

        manipulate the message itself, the keyword args or both. Return

        the message and kwargs modified (or not) to suit your needs.



        Normally, you'll only need to override this one method in a

        LoggerAdapter subclass for your specific needs.

        """

        kwargs["extra"] = self.extra

        return msg, kwargs



    def debug(self, msg, *args, **kwargs):

        """

        Delegate a debug call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.debug(msg, *args, **kwargs)



    def info(self, msg, *args, **kwargs):

        """

        Delegate an info call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.info(msg, *args, **kwargs)



    def warning(self, msg, *args, **kwargs):

        """

        Delegate a warning call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.warning(msg, *args, **kwargs)



    def error(self, msg, *args, **kwargs):

        """

        Delegate an error call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.error(msg, *args, **kwargs)



    def exception(self, msg, *args, **kwargs):

        """

        Delegate an exception call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        kwargs["exc_info"] = 1

        self.logger.error(msg, *args, **kwargs)



    def critical(self, msg, *args, **kwargs):

        """

        Delegate a critical call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.critical(msg, *args, **kwargs)



    def log(self, level, msg, *args, **kwargs):

        """

        Delegate a log call to the underlying logger, after adding

        contextual information from this adapter instance.

        """

        msg, kwargs = self.process(msg, kwargs)

        self.logger.log(level, msg, *args, **kwargs)



root = RootLogger(WARNING)

Logger.root = root

Logger.manager = Manager(Logger.root)



#---------------------------------------------------------------------------

# Configuration classes and functions

#---------------------------------------------------------------------------



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 is not None:

            root.setLevel(level)



#---------------------------------------------------------------------------

# Utility functions at module level.

# Basically delegate everything to the root logger.

#---------------------------------------------------------------------------



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 getRootLogger():

#    """

#    Return the root logger.

#

#    Note that getLogger('') now does the same thing, so this function is

#    deprecated and may disappear in the future.

#    """

#    return root



def critical(msg, *args, **kwargs):

    """

    Log a message with severity 'CRITICAL' on the root logger.

    """

    if len(root.handlers) == 0:

        basicConfig()

    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()

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



def exception(msg, *args):

    """

    Log a message with severity 'ERROR' on the root logger,

    with exception information.

    """

    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()

    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()

    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()

    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()

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



def disable(level):

    """

    Disable all logging calls less severe than 'level'.

    """

    root.manager.disable = level



def shutdown(handlerList=_handlerList):

    """

    Perform any cleanup actions in the logging system (e.g. flushing

    buffers).



    Should be called at application exit.

    """

    for h in handlerList[:]:

        #errors might occur, for example, if files are locked

        #we just ignore them if raiseExceptions is not set

        try:

            h.flush()

            h.close()

        except:

            if raiseExceptions:

                raise

            #else, swallow



#Let's try and shutdown automatically on application exit...

try:

    import atexit

    atexit.register(shutdown)

except ImportError: # for Python versions < 2.0

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

        try:

            shutdown()

        finally:

            old_exit(status)



    sys.exit = exithook

