[Zope-Checkins] CVS: Zope/lib/python/logging - init.py:1.1 config.py:1.1 handlers.py:1.1

Sun, 24 Nov 2002 00:23:00 -0500

Update of /cvs-repository/Zope/lib/python/logging
In directory cvs.zope.org:/tmp/cvs-serv18333

Added Files:
	__init__.py config.py handlers.py 
Log Message:
Adding Vinay Sajip's PEP282 logger.

=== Added File Zope/lib/python/logging/__init__.py === (1083/1183 lines abridged)
#! /usr/bin/env python
#
# Copyright 2001-2002 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.
#
# For the change history, see README.txt in the distribution.
#
# This file is part of the Python logging distribution. See
# http://www.red-dove.com/python_logging.html
#

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

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

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

import sys, os, types, time, string, struct, cPickle, cStringIO

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

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

[-=- -=- -=- 1083 lines omitted -=- -=- -=-]

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

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

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

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

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

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

    Should be called at application exit.
    """
    for h in _handlers.keys():
        h.flush()
        h.close()

if __name__ == "__main__":
    print __doc__

=== Added File Zope/lib/python/logging/config.py ===
#! /usr/bin/env python
#
# Copyright 2001-2002 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.
#
# For the change history, see README.txt in the distribution.
#
# This file is part of the Python logging distribution. See
# http://www.red-dove.com/python_logging.html
#

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

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

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

import sys, logging, logging.handlers, string, thread, threading, socket, struct, os

from SocketServer import ThreadingTCPServer, StreamRequestHandler

DEFAULT_LOGGING_CONFIG_PORT = 9030

#
#   The following code implements a socket listener for on-the-fly
#   reconfiguration of logging.
#
#   _listener holds the server object doing the listening
_listener = None

def fileConfig(fname,defaults=None):
    """
    Read the logging configuration from a ConfigParser-format file.

    This can be called several times from an application, allowing an end user
    the ability to select from various pre-canned configurations (if the
    developer provides a mechanism to present the choices and load the chosen
    configuration).
    In versions of ConfigParser which have the readfp method [typically
    shipped in 2.x versions of Python], you can pass in a file-like object
    rather than a filename, in which case the file-like object will be read
    using readfp.
    """
    import ConfigParser

    cp = ConfigParser.ConfigParser(defaults)
    if hasattr(cp, 'readfp') and hasattr(fname, 'readline'):
        cp.readfp(fname)
    else:
        cp.read(fname)
    #first, do the formatters...
    flist = cp.get("formatters", "keys")
    if len(flist):
        flist = string.split(flist, ",")
        formatters = {}
        for form in flist:
            sectname = "formatter_%s" % form
            opts = cp.options(sectname)
            if "format" in opts:
                fs = cp.get(sectname, "format", 1)
            else:
                fs = None
            if "datefmt" in opts:
                dfs = cp.get(sectname, "datefmt", 1)
            else:
                dfs = None
            f = logging.Formatter(fs, dfs)
            formatters[form] = f
    #next, do the handlers...
    #critical section...
    logging._acquireLock()
    try:
        try:
            #first, lose the existing handlers...
            logging._handlers.clear()
            #now set up the new ones...
            hlist = cp.get("handlers", "keys")
            if len(hlist):
                hlist = string.split(hlist, ",")
                handlers = {}
                fixups = [] #for inter-handler references
                for hand in hlist:
                    sectname = "handler_%s" % hand
                    klass = cp.get(sectname, "class")
                    opts = cp.options(sectname)
                    if "formatter" in opts:
                        fmt = cp.get(sectname, "formatter")
                    else:
                        fmt = ""
                    klass = eval(klass, vars(logging))
                    args = cp.get(sectname, "args")
                    args = eval(args, vars(logging))
                    h = apply(klass, args)
                    if "level" in opts:
                        level = cp.get(sectname, "level")
                        h.setLevel(logging._levelNames[level])
                    if len(fmt):
                        h.setFormatter(formatters[fmt])
                    #temporary hack for FileHandler and MemoryHandler.
                    if klass == logging.handlers.MemoryHandler:
                        if "target" in opts:
                            target = cp.get(sectname,"target")
                        else:
                            target = ""
                        if len(target): #the target handler may not be loaded yet, so keep for later...
                            fixups.append((h, target))
                    handlers[hand] = h
                #now all handlers are loaded, fixup inter-handler references...
                for fixup in fixups:
                    h = fixup[0]
                    t = fixup[1]
                    h.setTarget(handlers[t])
            #at last, the loggers...first the root...
            llist = cp.get("loggers", "keys")
            llist = string.split(llist, ",")
            llist.remove("root")
            sectname = "logger_root"
            root = logging.root
            log = root
            opts = cp.options(sectname)
            if "level" in opts:
                level = cp.get(sectname, "level")
                log.setLevel(logging._levelNames[level])
            for h in root.handlers:
                root.removeHandler(h)
            hlist = cp.get(sectname, "handlers")
            if len(hlist):
                hlist = string.split(hlist, ",")
                for hand in hlist:
                    log.addHandler(handlers[hand])
            #and now the others...
            #we don't want to lose the existing loggers,
            #since other threads may have pointers to them.
            #existing is set to contain all existing loggers,
            #and as we go through the new configuration we
            #remove any which are configured. At the end,
            #what's left in existing is the set of loggers
            #which were in the previous configuration but
            #which are not in the new configuration.
            existing = root.manager.loggerDict.keys()
            #now set up the new ones...
            for log in llist:
                sectname = "logger_%s" % log
                qn = cp.get(sectname, "qualname")
                opts = cp.options(sectname)
                if "propagate" in opts:
                    propagate = cp.getint(sectname, "propagate")
                else:
                    propagate = 1
                logger = logging.getLogger(qn)
                if qn in existing:
                    existing.remove(qn)
                if "level" in opts:
                    level = cp.get(sectname, "level")
                    logger.setLevel(logging._levelNames[level])
                for h in logger.handlers:
                    logger.removeHandler(h)
                logger.propagate = propagate
                logger.disabled = 0
                hlist = cp.get(sectname, "handlers")
                if len(hlist):
                    hlist = string.split(hlist, ",")
                    for hand in hlist:
                        logger.addHandler(handlers[hand])
            #Disable any old loggers. There's no point deleting
            #them as other threads may continue to hold references
            #and by disabling them, you stop them doing any logging.
            for log in existing:
                root.manager.loggerDict[log].disabled = 1
        except:
            import traceback
            ei = sys.exc_info()
            traceback.print_exception(ei[0], ei[1], ei[2], None, sys.stderr)
            del ei
    finally:
        logging._releaseLock()

def listen(port=DEFAULT_LOGGING_CONFIG_PORT):
    """
    Start up a socket server on the specified port, and listen for new
    configurations.

    These will be sent as a file suitable for processing by fileConfig().
    Returns a Thread object on which you can call start() to start the server,
    and which you can join() when appropriate. To stop the server, call
    stopListening().
    """
    if not thread:
        raise NotImplementedError, "listen() needs threading to work"

    class ConfigStreamHandler(StreamRequestHandler):
        """
        Handler for a logging configuration request.

        It expects a completely new logging configuration and uses fileConfig
        to install it.
        """
        def handle(self):
            """
            Handle a request.

            Each request is expected to be a 4-byte length,
            followed by the config file. Uses fileConfig() to do the
            grunt work.
            """
            import tempfile
            try:
                conn = self.connection
                chunk = conn.recv(4)
                if len(chunk) == 4:
                    slen = struct.unpack(">L", chunk)[0]
                    chunk = self.connection.recv(slen)
                    while len(chunk) < slen:
                        chunk = chunk + conn.recv(slen - len(chunk))
                    #Apply new configuration. We'd like to be able to
                    #create a StringIO and pass that in, but unfortunately
                    #1.5.2 ConfigParser does not support reading file
                    #objects, only actual files. So we create a temporary
                    #file and remove it later.
                    file = tempfile.mktemp(".ini")
                    f = open(file, "w")
                    f.write(chunk)
                    f.close()
                    fileConfig(file)
                    os.remove(file)
            except socket.error, e:
                if type(e.args) != types.TupleType:
                    raise
                else:
                    errcode = e.args[0]
                    if errcode != RESET_ERROR:
                        raise

    class ConfigSocketReceiver(ThreadingTCPServer):
        """
        A simple TCP socket-based logging config receiver.
        """

        allow_reuse_address = 1

        def __init__(self, host='localhost', port=DEFAULT_LOGGING_CONFIG_PORT,
                handler=None):
            ThreadingTCPServer.__init__(self, (host, port), handler)
            logging._acquireLock()
            self.abort = 0
            logging._releaseLock()
            self.timeout = 1

        def serve_until_stopped(self):
            import select
            abort = 0
            while not abort:
                rd, wr, ex = select.select([self.socket.fileno()],
                                           [], [],
                                           self.timeout)
                if rd:
                    self.handle_request()
                logging._acquireLock()
                abort = self.abort
                logging._releaseLock()

    def serve(rcvr, hdlr):
        server = rcvr(handler=hdlr)
        global _listener
        logging._acquireLock()
        _listener = server
        logging._releaseLock()
        server.serve_until_stopped()

    return threading.Thread(target=serve, args=(ConfigSocketReceiver, ConfigStreamHandler))

def stopListening():
    """
    Stop the listening server which was created with a call to listen().
    """
    if _listener:
        logging._acquireLock()
        _listener.abort = 1
        _listener = None
        logging._releaseLock()

=== Added File Zope/lib/python/logging/handlers.py === (610/710 lines abridged)
#! /usr/bin/env python
#
# Copyright 2001-2002 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.
#
# For the change history, see README.txt in the distribution.
#
# This file is part of the Python logging distribution. See
# http://www.red-dove.com/python_logging.html
#

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

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

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

import sys, logging, socket, types, os, string, cPickle, struct

from SocketServer import ThreadingTCPServer, StreamRequestHandler

#
# Some constants...
#

DEFAULT_TCP_LOGGING_PORT    = 9020
DEFAULT_UDP_LOGGING_PORT    = 9021
DEFAULT_HTTP_LOGGING_PORT   = 9022
DEFAULT_SOAP_LOGGING_PORT   = 9023
SYSLOG_UDP_PORT             = 514

[-=- -=- -=- 610 lines omitted -=- -=- -=-]

class MemoryHandler(BufferingHandler):
    """
    A handler class which buffers logging records in memory, periodically
    flushing them to a target handler. Flushing occurs whenever the buffer
    is full, or when an event of a certain severity or greater is seen.
    """
    def __init__(self, capacity, flushLevel=logging.ERROR, target=None):
        """
        Initialize the handler with the buffer size, the level at which
        flushing should occur and an optional target.

        Note that without a target being set either here or via setTarget(),
        a MemoryHandler is no use to anyone!
        """
        BufferingHandler.__init__(self, capacity)
        self.flushLevel = flushLevel
        self.target = target

    def shouldFlush(self, record):
        """
        Check for buffer full or a record at the flushLevel or higher.
        """
        return (len(self.buffer) >= self.capacity) or \
                (record.levelno >= self.flushLevel)

    def setTarget(self, target):
        """
        Set the target handler for this handler.
        """
        self.target = target

    def flush(self):
        """
        For a MemoryHandler, flushing means just sending the buffered
        records to the target, if there is one. Override if you want
        different behaviour.
        """
        if self.target:
            for record in self.buffer:
                self.target.handle(record)
            self.buffer = []

    def close(self):
        """
        Flush, set the target to None and lose the buffer.
        """
        self.flush()
        self.target = None
        self.buffer = []

[Zope-Checkins] CVS: Zope/lib/python/logging - __init__.py:1.1 config.py:1.1 handlers.py:1.1

[Zope-Checkins] CVS: Zope/lib/python/logging - init.py:1.1 config.py:1.1 handlers.py:1.1