348 lines
12 KiB
Python
348 lines
12 KiB
Python
# Copyright 2001-2005 by Vinay Sajip. All Rights Reserved.
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#
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# Permission to use, copy, modify, and distribute this software and its
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# documentation for any purpose and without fee is hereby granted,
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# provided that the above copyright notice appear in all copies and that
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# both that copyright notice and this permission notice appear in
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# supporting documentation, and that the name of Vinay Sajip
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# not be used in advertising or publicity pertaining to distribution
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# of the software without specific, written prior permission.
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# VINAY SAJIP DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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# VINAY SAJIP BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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# IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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"""
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Configuration functions for the logging package for Python. The core package
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is based on PEP 282 and comments thereto in comp.lang.python, and influenced
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by Apache's log4j system.
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Should work under Python versions >= 1.5.2, except that source line
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information is not available unless 'sys._getframe()' is.
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Copyright (C) 2001-2004 Vinay Sajip. All Rights Reserved.
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To use, simply 'import logging' and log away!
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"""
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import sys, logging, logging.handlers, string, socket, struct, os, traceback, types
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try:
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import thread
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import threading
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except ImportError:
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thread = None
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from SocketServer import ThreadingTCPServer, StreamRequestHandler
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DEFAULT_LOGGING_CONFIG_PORT = 9030
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if sys.platform == "win32":
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RESET_ERROR = 10054 #WSAECONNRESET
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else:
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RESET_ERROR = 104 #ECONNRESET
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#
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# The following code implements a socket listener for on-the-fly
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# reconfiguration of logging.
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#
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# _listener holds the server object doing the listening
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_listener = None
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def fileConfig(fname, defaults=None):
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"""
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Read the logging configuration from a ConfigParser-format file.
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This can be called several times from an application, allowing an end user
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the ability to select from various pre-canned configurations (if the
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developer provides a mechanism to present the choices and load the chosen
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configuration).
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In versions of ConfigParser which have the readfp method [typically
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shipped in 2.x versions of Python], you can pass in a file-like object
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rather than a filename, in which case the file-like object will be read
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using readfp.
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"""
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import ConfigParser
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cp = ConfigParser.ConfigParser(defaults)
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if hasattr(cp, 'readfp') and hasattr(fname, 'readline'):
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cp.readfp(fname)
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else:
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cp.read(fname)
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formatters = _create_formatters(cp)
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# critical section
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logging._acquireLock()
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try:
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logging._handlers.clear()
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del logging._handlerList[:]
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# Handlers add themselves to logging._handlers
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handlers = _install_handlers(cp, formatters)
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_install_loggers(cp, handlers)
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finally:
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logging._releaseLock()
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def _resolve(name):
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"""Resolve a dotted name to a global object."""
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name = string.split(name, '.')
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used = name.pop(0)
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found = __import__(used)
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for n in name:
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used = used + '.' + n
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try:
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found = getattr(found, n)
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except AttributeError:
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__import__(used)
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found = getattr(found, n)
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return found
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def _create_formatters(cp):
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"""Create and return formatters"""
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flist = cp.get("formatters", "keys")
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if not len(flist):
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return {}
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flist = string.split(flist, ",")
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formatters = {}
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for form in flist:
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sectname = "formatter_%s" % string.strip(form)
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opts = cp.options(sectname)
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if "format" in opts:
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fs = cp.get(sectname, "format", 1)
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else:
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fs = None
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if "datefmt" in opts:
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dfs = cp.get(sectname, "datefmt", 1)
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else:
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dfs = None
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c = logging.Formatter
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if "class" in opts:
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class_name = cp.get(sectname, "class")
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if class_name:
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c = _resolve(class_name)
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f = c(fs, dfs)
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formatters[form] = f
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return formatters
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def _install_handlers(cp, formatters):
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"""Install and return handlers"""
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hlist = cp.get("handlers", "keys")
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if not len(hlist):
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return {}
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hlist = string.split(hlist, ",")
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handlers = {}
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fixups = [] #for inter-handler references
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for hand in hlist:
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sectname = "handler_%s" % string.strip(hand)
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klass = cp.get(sectname, "class")
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opts = cp.options(sectname)
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if "formatter" in opts:
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fmt = cp.get(sectname, "formatter")
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else:
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fmt = ""
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klass = eval(klass, vars(logging))
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args = cp.get(sectname, "args")
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args = eval(args, vars(logging))
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h = apply(klass, args)
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if "level" in opts:
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level = cp.get(sectname, "level")
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h.setLevel(logging._levelNames[level])
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if len(fmt):
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h.setFormatter(formatters[fmt])
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#temporary hack for FileHandler and MemoryHandler.
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if klass == logging.handlers.MemoryHandler:
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if "target" in opts:
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target = cp.get(sectname,"target")
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else:
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target = ""
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if len(target): #the target handler may not be loaded yet, so keep for later...
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fixups.append((h, target))
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handlers[hand] = h
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#now all handlers are loaded, fixup inter-handler references...
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for h, t in fixups:
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h.setTarget(handlers[t])
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return handlers
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def _install_loggers(cp, handlers):
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"""Create and install loggers"""
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# configure the root first
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llist = cp.get("loggers", "keys")
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llist = string.split(llist, ",")
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llist = map(lambda x: string.strip(x), llist)
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llist.remove("root")
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sectname = "logger_root"
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root = logging.root
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log = root
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opts = cp.options(sectname)
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if "level" in opts:
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level = cp.get(sectname, "level")
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log.setLevel(logging._levelNames[level])
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for h in root.handlers[:]:
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root.removeHandler(h)
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hlist = cp.get(sectname, "handlers")
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if len(hlist):
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hlist = string.split(hlist, ",")
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for hand in hlist:
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log.addHandler(handlers[string.strip(hand)])
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#and now the others...
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#we don't want to lose the existing loggers,
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#since other threads may have pointers to them.
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#existing is set to contain all existing loggers,
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#and as we go through the new configuration we
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#remove any which are configured. At the end,
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#what's left in existing is the set of loggers
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#which were in the previous configuration but
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#which are not in the new configuration.
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existing = root.manager.loggerDict.keys()
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#now set up the new ones...
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for log in llist:
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sectname = "logger_%s" % log
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qn = cp.get(sectname, "qualname")
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opts = cp.options(sectname)
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if "propagate" in opts:
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propagate = cp.getint(sectname, "propagate")
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else:
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propagate = 1
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logger = logging.getLogger(qn)
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if qn in existing:
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existing.remove(qn)
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if "level" in opts:
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level = cp.get(sectname, "level")
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logger.setLevel(logging._levelNames[level])
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for h in logger.handlers[:]:
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logger.removeHandler(h)
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logger.propagate = propagate
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logger.disabled = 0
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hlist = cp.get(sectname, "handlers")
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if len(hlist):
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hlist = string.split(hlist, ",")
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for hand in hlist:
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logger.addHandler(handlers[string.strip(hand)])
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#Disable any old loggers. There's no point deleting
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#them as other threads may continue to hold references
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#and by disabling them, you stop them doing any logging.
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for log in existing:
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root.manager.loggerDict[log].disabled = 1
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def listen(port=DEFAULT_LOGGING_CONFIG_PORT):
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"""
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Start up a socket server on the specified port, and listen for new
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configurations.
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These will be sent as a file suitable for processing by fileConfig().
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Returns a Thread object on which you can call start() to start the server,
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and which you can join() when appropriate. To stop the server, call
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stopListening().
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"""
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if not thread:
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raise NotImplementedError, "listen() needs threading to work"
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class ConfigStreamHandler(StreamRequestHandler):
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"""
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Handler for a logging configuration request.
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It expects a completely new logging configuration and uses fileConfig
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to install it.
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"""
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def handle(self):
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"""
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Handle a request.
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Each request is expected to be a 4-byte length, packed using
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struct.pack(">L", n), followed by the config file.
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Uses fileConfig() to do the grunt work.
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"""
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import tempfile
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try:
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conn = self.connection
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chunk = conn.recv(4)
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if len(chunk) == 4:
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slen = struct.unpack(">L", chunk)[0]
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chunk = self.connection.recv(slen)
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while len(chunk) < slen:
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chunk = chunk + conn.recv(slen - len(chunk))
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#Apply new configuration. We'd like to be able to
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#create a StringIO and pass that in, but unfortunately
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#1.5.2 ConfigParser does not support reading file
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#objects, only actual files. So we create a temporary
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#file and remove it later.
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file = tempfile.mktemp(".ini")
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f = open(file, "w")
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f.write(chunk)
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f.close()
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try:
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fileConfig(file)
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except (KeyboardInterrupt, SystemExit):
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raise
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except:
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traceback.print_exc()
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os.remove(file)
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except socket.error, e:
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if type(e.args) != types.TupleType:
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raise
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else:
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errcode = e.args[0]
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if errcode != RESET_ERROR:
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raise
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class ConfigSocketReceiver(ThreadingTCPServer):
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"""
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A simple TCP socket-based logging config receiver.
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"""
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allow_reuse_address = 1
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def __init__(self, host='localhost', port=DEFAULT_LOGGING_CONFIG_PORT,
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handler=None):
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ThreadingTCPServer.__init__(self, (host, port), handler)
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logging._acquireLock()
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self.abort = 0
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logging._releaseLock()
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self.timeout = 1
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def serve_until_stopped(self):
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import select
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abort = 0
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while not abort:
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rd, wr, ex = select.select([self.socket.fileno()],
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[], [],
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self.timeout)
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if rd:
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self.handle_request()
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logging._acquireLock()
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abort = self.abort
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logging._releaseLock()
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def serve(rcvr, hdlr, port):
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server = rcvr(port=port, handler=hdlr)
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global _listener
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logging._acquireLock()
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_listener = server
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logging._releaseLock()
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server.serve_until_stopped()
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return threading.Thread(target=serve,
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args=(ConfigSocketReceiver,
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ConfigStreamHandler, port))
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def stopListening():
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"""
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Stop the listening server which was created with a call to listen().
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"""
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global _listener
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if _listener:
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logging._acquireLock()
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_listener.abort = 1
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_listener = None
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logging._releaseLock()
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