File Manager

Editing File: /usr/lib/python2.7/logging/init.py

# Copyright 2001-2014 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.

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

import sys, os, time, cStringIO, traceback, warnings, weakref, collections

__all__ = ['BASIC_FORMAT', 'BufferingFormatter', 'CRITICAL', 'DEBUG', 'ERROR',
           'FATAL', 'FileHandler', 'Filter', 'Formatter', 'Handler', 'INFO',
           'LogRecord', 'Logger', 'LoggerAdapter', 'NOTSET', 'NullHandler',
           'StreamHandler', 'WARN', 'WARNING', 'addLevelName', 'basicConfig',
           'captureWarnings', 'critical', 'debug', 'disable', 'error',
           'exception', 'fatal', 'getLevelName', 'getLogger', 'getLoggerClass',
           'info', 'log', 'makeLogRecord', 'setLoggerClass', 'warn', 'warning']

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"
# Note: the attributes below are no longer maintained.
__version__ = "0.5.1.2"
__date__    = "07 February 2010"

#---------------------------------------------------------------------------
#   Miscellaneous module data
#---------------------------------------------------------------------------
try:
    unicode
    _unicode = True
except NameError:
    _unicode = False

# 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_info()[2].tb_frame.f_back

if hasattr(sys, '_getframe'): currentframe = lambda: sys._getframe(3)
# done filching

#
# _srcfile is used when walking the stack to check when we've got the first
# caller stack frame.
#
_srcfile = os.path.normcase(currentframe.__code__.co_filename)

# _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()

def _checkLevel(level):
    if isinstance(level, (int, long)):
        rv = level
    elif str(level) == level:
        if level not in _levelNames:
            raise ValueError("Unknown level: %r" % level)
        rv = _levelNames[level]
    else:
        raise TypeError("Level not an integer or a valid string: %r" % level)
    return rv

#---------------------------------------------------------------------------
#   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 and configures
#Handlers, and so might arbitrary user threads. Since Handler code 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.
#
if thread:
    _lock = threading.RLock()
else:
    _lock = None

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

This should be released with _releaseLock().
    """
    if _lock:
        _lock.acquire()

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

#---------------------------------------------------------------------------
#   The logging record
#---------------------------------------------------------------------------

class LogRecord(object):
    """
    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.
        # Issue #21172: a request was made to relax the isinstance check
        # to hasattr(args[0], '__getitem__'). However, the docs on string
        # formatting still seem to suggest a mapping object is required.
        # Thus, while not removing the isinstance check, it does now look
        # for collections.Mapping rather than, as before, dict.
        if (args and len(args) == 1 and isinstance(args[0], collections.Mapping)
            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
        else:
            self.processName = 'MainProcess'
            mp = sys.modules.get('multiprocessing')
            if mp is not None:
                # Errors may occur if multiprocessing has not finished loading
                # yet - e.g. if a custom import hook causes third-party code
                # to run when multiprocessing calls import. See issue 8200
                # for an example
                try:
                    self.processName = mp.current_process().name
                except StandardError:
                    pass
        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 _unicode: #if no unicode support...
            msg = str(self.msg)
        else:
            msg = self.msg
            if not isinstance(msg, basestring):
                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(object):
    """
    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 usesTime(self):
        """
        Check if the format uses the creation time of the record.
        """
        return self._fmt.find("%(asctime)") >= 0

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 uses the
        time (as determined by a call to usesTime(), 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 self.usesTime():
            record.asctime = self.formatTime(record, self.datefmt)
        try:
            s = self._fmt % record.__dict__
        except UnicodeDecodeError as e:
            # Issue 25664. The logger name may be Unicode. Try again ...
            try:
                record.name = record.name.decode('utf-8')
                s = self._fmt % record.__dict__
            except UnicodeDecodeError:
                raise e
        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"
            try:
                s = s + record.exc_text
            except UnicodeError:
                # Sometimes filenames have non-ASCII chars, which can lead
                # to errors when s is Unicode and record.exc_text is str
                # See issue 8924.
                # We also use replace for when there are multiple
                # encodings, e.g. UTF-8 for the filesystem and latin-1
                # for a script. See issue 13232.
                s = s + record.exc_text.decode(sys.getfilesystemencoding(),
                                               'replace')
        return s

#
#   The default formatter to use when no other is specified
#
_defaultFormatter = Formatter()

class BufferingFormatter(object):
    """
    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(object):
    """
    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 record.name.find(self.name, 0, self.nlen) != 0:
            return 0
        return (record.name[self.nlen] == ".")

class Filterer(object):
    """
    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 = weakref.WeakValueDictionary()  #map of handler names to handlers
_handlerList = [] # added to allow handlers to be removed in reverse of order initialized

def _removeHandlerRef(wr):
    """
    Remove a handler reference from the internal cleanup list.
    """
    # This function can be called during module teardown, when globals are
    # set to None. It can also be called from another thread. So we need to
    # pre-emptively grab the necessary globals and check if they're None,
    # to prevent race conditions and failures during interpreter shutdown.
    acquire, release, handlers = _acquireLock, _releaseLock, _handlerList
    if acquire and release and handlers:
        try:
            acquire()
            try:
                if wr in handlers:
                    handlers.remove(wr)
            finally:
                release()
        except TypeError:
            # https://bugs.python.org/issue21149 - If the RLock object behind
            # acquire() and release() has been partially finalized you may see
            # an error about NoneType not being callable.  Absolutely nothing
            # we can do in this GC during process shutdown situation.  Eat it.
            pass

def _addHandlerRef(handler):
    """
    Add a handler to the internal cleanup list using a weak reference.
    """
    _acquireLock()
    try:
        _handlerList.append(weakref.ref(handler, _removeHandlerRef))
    finally:
        _releaseLock()

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._name = None
        self.level = _checkLevel(level)
        self.formatter = None
        # Add the handler to the global _handlerList (for cleanup on shutdown)
        _addHandlerRef(self)
        self.createLock()

def get_name(self):
        return self._name

def set_name(self, name):
        _acquireLock()
        try:
            if self._name in _handlers:
                del _handlers[self._name]
            self._name = name
            if name:
                _handlers[name] = self
        finally:
            _releaseLock()

name = property(get_name, set_name)

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 = _checkLevel(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 removes the handler from an internal map of handlers,
        _handlers, which is used for handler lookup by name. 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...
            if self._name and self._name in _handlers:
                del _handlers[self._name]
        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 and sys.stderr:  # see issue 13807
            ei = sys.exc_info()
            try:
                traceback.print_exception(ei[0], ei[1], ei[2],
                                          None, sys.stderr)
                sys.stderr.write('Logged from file %s, line %s\n' % (
                                 record.filename, record.lineno))
            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, stream=None):
        """
        Initialize the handler.

If stream is not specified, sys.stderr is used.
        """
        Handler.__init__(self)
        if stream is None:
            stream = sys.stderr
        self.stream = stream

def flush(self):
        """
        Flushes the stream.
        """
        self.acquire()
        try:
            if self.stream and hasattr(self.stream, "flush"):
                self.stream.flush()
        finally:
            self.release()

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 determine how to do the
        output to the stream.
        """
        try:
            msg = self.format(record)
            stream = self.stream
            fs = "%s\n"
            if not _unicode: #if no unicode support...
                stream.write(fs % msg)
            else:
                try:
                    if (isinstance(msg, unicode) and
                        getattr(stream, 'encoding', None)):
                        ufs = u'%s\n'
                        try:
                            stream.write(ufs % 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((ufs % 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
        self.delay = delay
        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.
        """
        self.acquire()
        try:
            try:
                if self.stream:
                    try:
                        self.flush()
                    finally:
                        stream = self.stream
                        self.stream = None
                        if hasattr(stream, "close"):
                            stream.close()
            finally:
                # Issue #19523: call unconditionally to
                # prevent a handler leak when delay is set
                StreamHandler.close(self)
        finally:
            self.release()

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(object):
    """
    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(object):
    """
    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 = {}
        self.loggerClass = None

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
        if not isinstance(name, basestring):
            raise TypeError('A logger name must be string or Unicode')
        if isinstance(name, unicode):
            name = name.encode('utf-8')
        _acquireLock()
        try:
            if name in self.loggerDict:
                rv = self.loggerDict[name]
                if isinstance(rv, PlaceHolder):
                    ph = rv
                    rv = (self.loggerClass or _loggerClass)(name)
                    rv.manager = self
                    self.loggerDict[name] = rv
                    self._fixupChildren(ph, rv)
                    self._fixupParents(rv)
            else:
                rv = (self.loggerClass or _loggerClass)(name)
                rv.manager = self
                self.loggerDict[name] = rv
                self._fixupParents(rv)
        finally:
            _releaseLock()
        return rv

def setLoggerClass(self, klass):
        """
        Set the class to be used when instantiating a logger with this Manager.
        """
        if klass != Logger:
            if not issubclass(klass, Logger):
                raise TypeError("logger not derived from logging.Logger: "
                                + klass.__name__)
        self.loggerClass = klass

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 = name.rfind(".")
        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 = name.rfind(".", 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 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 = _checkLevel(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 = _checkLevel(level)

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