# 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. """ 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. Copyright (C) 2001-2002 Vinay Sajip. All Rights Reserved. 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()