923 lines
35 KiB
Python
923 lines
35 KiB
Python
# Copyright 2001-2012 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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Copyright (C) 2001-2012 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, socket, struct, traceback, re
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import io
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try:
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import _thread as thread
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import threading
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except ImportError: #pragma: no cover
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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, disable_existing_loggers=True):
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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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"""
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import configparser
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if isinstance(fname, configparser.RawConfigParser):
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cp = fname
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else:
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cp = configparser.ConfigParser(defaults)
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if hasattr(fname, 'readline'):
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cp.read_file(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, disable_existing_loggers)
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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 = name.split('.')
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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 _strip_spaces(alist):
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return map(lambda x: x.strip(), alist)
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def _create_formatters(cp):
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"""Create and return formatters"""
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flist = cp["formatters"]["keys"]
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if not len(flist):
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return {}
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flist = flist.split(",")
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flist = _strip_spaces(flist)
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formatters = {}
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for form in flist:
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sectname = "formatter_%s" % form
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fs = cp.get(sectname, "format", raw=True, fallback=None)
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dfs = cp.get(sectname, "datefmt", raw=True, fallback=None)
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c = logging.Formatter
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class_name = cp[sectname].get("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["handlers"]["keys"]
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if not len(hlist):
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return {}
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hlist = hlist.split(",")
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hlist = _strip_spaces(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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section = cp["handler_%s" % hand]
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klass = section["class"]
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fmt = section.get("formatter", "")
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try:
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klass = eval(klass, vars(logging))
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except (AttributeError, NameError):
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klass = _resolve(klass)
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args = section["args"]
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args = eval(args, vars(logging))
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h = klass(*args)
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if "level" in section:
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level = section["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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if issubclass(klass, logging.handlers.MemoryHandler):
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target = section.get("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 _handle_existing_loggers(existing, child_loggers, disable_existing):
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"""
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When (re)configuring logging, handle loggers which were in the previous
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configuration but are not in the new configuration. There's no point
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deleting them as other threads may continue to hold references to them;
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and by disabling them, you stop them doing any logging.
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However, don't disable children of named loggers, as that's probably not
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what was intended by the user. Also, allow existing loggers to NOT be
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disabled if disable_existing is false.
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"""
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root = logging.root
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for log in existing:
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logger = root.manager.loggerDict[log]
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if log in child_loggers:
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logger.level = logging.NOTSET
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logger.handlers = []
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logger.propagate = True
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elif disable_existing:
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logger.disabled = True
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def _install_loggers(cp, handlers, disable_existing):
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"""Create and install loggers"""
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# configure the root first
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llist = cp["loggers"]["keys"]
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llist = llist.split(",")
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llist = list(map(lambda x: x.strip(), llist))
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llist.remove("root")
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section = cp["logger_root"]
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root = logging.root
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log = root
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if "level" in section:
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level = section["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 = section["handlers"]
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if len(hlist):
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hlist = hlist.split(",")
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hlist = _strip_spaces(hlist)
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for hand in hlist:
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log.addHandler(handlers[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 = list(root.manager.loggerDict.keys())
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#The list needs to be sorted so that we can
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#avoid disabling child loggers of explicitly
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#named loggers. With a sorted list it is easier
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#to find the child loggers.
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existing.sort()
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#We'll keep the list of existing loggers
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#which are children of named loggers here...
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child_loggers = []
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#now set up the new ones...
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for log in llist:
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section = cp["logger_%s" % log]
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qn = section["qualname"]
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propagate = section.getint("propagate", fallback=1)
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logger = logging.getLogger(qn)
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if qn in existing:
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i = existing.index(qn) + 1 # start with the entry after qn
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prefixed = qn + "."
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pflen = len(prefixed)
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num_existing = len(existing)
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while i < num_existing:
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if existing[i][:pflen] == prefixed:
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child_loggers.append(existing[i])
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i += 1
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existing.remove(qn)
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if "level" in section:
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level = section["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 = section["handlers"]
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if len(hlist):
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hlist = hlist.split(",")
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hlist = _strip_spaces(hlist)
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for hand in hlist:
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logger.addHandler(handlers[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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#However, don't disable children of named loggers, as that's
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#probably not what was intended by the user.
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#for log in existing:
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# logger = root.manager.loggerDict[log]
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# if log in child_loggers:
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# logger.level = logging.NOTSET
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# logger.handlers = []
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# logger.propagate = 1
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# elif disable_existing_loggers:
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# logger.disabled = 1
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_handle_existing_loggers(existing, child_loggers, disable_existing)
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IDENTIFIER = re.compile('^[a-z_][a-z0-9_]*$', re.I)
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def valid_ident(s):
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m = IDENTIFIER.match(s)
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if not m:
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raise ValueError('Not a valid Python identifier: %r' % s)
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return True
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# The ConvertingXXX classes are wrappers around standard Python containers,
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# and they serve to convert any suitable values in the container. The
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# conversion converts base dicts, lists and tuples to their wrapped
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# equivalents, whereas strings which match a conversion format are converted
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# appropriately.
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#
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# Each wrapper should have a configurator attribute holding the actual
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# configurator to use for conversion.
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class ConvertingDict(dict):
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"""A converting dictionary wrapper."""
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def __getitem__(self, key):
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value = dict.__getitem__(self, key)
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result = self.configurator.convert(value)
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#If the converted value is different, save for next time
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if value is not result:
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self[key] = result
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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result.key = key
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return result
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def get(self, key, default=None):
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value = dict.get(self, key, default)
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result = self.configurator.convert(value)
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#If the converted value is different, save for next time
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if value is not result:
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self[key] = result
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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result.key = key
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return result
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def pop(self, key, default=None):
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value = dict.pop(self, key, default)
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result = self.configurator.convert(value)
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if value is not result:
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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result.key = key
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return result
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class ConvertingList(list):
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"""A converting list wrapper."""
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def __getitem__(self, key):
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value = list.__getitem__(self, key)
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result = self.configurator.convert(value)
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#If the converted value is different, save for next time
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if value is not result:
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self[key] = result
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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result.key = key
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return result
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def pop(self, idx=-1):
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value = list.pop(self, idx)
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result = self.configurator.convert(value)
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if value is not result:
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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return result
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class ConvertingTuple(tuple):
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"""A converting tuple wrapper."""
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def __getitem__(self, key):
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value = tuple.__getitem__(self, key)
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result = self.configurator.convert(value)
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if value is not result:
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if type(result) in (ConvertingDict, ConvertingList,
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ConvertingTuple):
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result.parent = self
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result.key = key
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return result
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class BaseConfigurator(object):
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"""
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The configurator base class which defines some useful defaults.
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"""
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CONVERT_PATTERN = re.compile(r'^(?P<prefix>[a-z]+)://(?P<suffix>.*)$')
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WORD_PATTERN = re.compile(r'^\s*(\w+)\s*')
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DOT_PATTERN = re.compile(r'^\.\s*(\w+)\s*')
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INDEX_PATTERN = re.compile(r'^\[\s*(\w+)\s*\]\s*')
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DIGIT_PATTERN = re.compile(r'^\d+$')
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value_converters = {
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'ext' : 'ext_convert',
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'cfg' : 'cfg_convert',
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}
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# We might want to use a different one, e.g. importlib
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importer = staticmethod(__import__)
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def __init__(self, config):
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self.config = ConvertingDict(config)
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self.config.configurator = self
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def resolve(self, s):
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"""
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Resolve strings to objects using standard import and attribute
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syntax.
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"""
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name = s.split('.')
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used = name.pop(0)
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try:
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found = self.importer(used)
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for frag in name:
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used += '.' + frag
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try:
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found = getattr(found, frag)
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except AttributeError:
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self.importer(used)
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found = getattr(found, frag)
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return found
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except ImportError:
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e, tb = sys.exc_info()[1:]
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v = ValueError('Cannot resolve %r: %s' % (s, e))
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v.__cause__, v.__traceback__ = e, tb
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raise v
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def ext_convert(self, value):
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"""Default converter for the ext:// protocol."""
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return self.resolve(value)
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def cfg_convert(self, value):
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"""Default converter for the cfg:// protocol."""
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rest = value
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m = self.WORD_PATTERN.match(rest)
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if m is None:
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raise ValueError("Unable to convert %r" % value)
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else:
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rest = rest[m.end():]
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d = self.config[m.groups()[0]]
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#print d, rest
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while rest:
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m = self.DOT_PATTERN.match(rest)
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if m:
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d = d[m.groups()[0]]
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else:
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m = self.INDEX_PATTERN.match(rest)
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if m:
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idx = m.groups()[0]
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if not self.DIGIT_PATTERN.match(idx):
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d = d[idx]
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else:
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try:
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n = int(idx) # try as number first (most likely)
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d = d[n]
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except TypeError:
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d = d[idx]
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if m:
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rest = rest[m.end():]
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else:
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raise ValueError('Unable to convert '
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'%r at %r' % (value, rest))
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#rest should be empty
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return d
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|
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def convert(self, value):
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"""
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Convert values to an appropriate type. dicts, lists and tuples are
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replaced by their converting alternatives. Strings are checked to
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see if they have a conversion format and are converted if they do.
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"""
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if not isinstance(value, ConvertingDict) and isinstance(value, dict):
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value = ConvertingDict(value)
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value.configurator = self
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elif not isinstance(value, ConvertingList) and isinstance(value, list):
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value = ConvertingList(value)
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value.configurator = self
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elif not isinstance(value, ConvertingTuple) and\
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isinstance(value, tuple):
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value = ConvertingTuple(value)
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value.configurator = self
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elif isinstance(value, str): # str for py3k
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m = self.CONVERT_PATTERN.match(value)
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if m:
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d = m.groupdict()
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prefix = d['prefix']
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converter = self.value_converters.get(prefix, None)
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if converter:
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suffix = d['suffix']
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converter = getattr(self, converter)
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value = converter(suffix)
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return value
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|
|
def configure_custom(self, config):
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"""Configure an object with a user-supplied factory."""
|
|
c = config.pop('()')
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if not callable(c):
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c = self.resolve(c)
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props = config.pop('.', None)
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# Check for valid identifiers
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kwargs = dict([(k, config[k]) for k in config if valid_ident(k)])
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result = c(**kwargs)
|
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if props:
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for name, value in props.items():
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setattr(result, name, value)
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return result
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|
|
def as_tuple(self, value):
|
|
"""Utility function which converts lists to tuples."""
|
|
if isinstance(value, list):
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value = tuple(value)
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return value
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|
|
class DictConfigurator(BaseConfigurator):
|
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"""
|
|
Configure logging using a dictionary-like object to describe the
|
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configuration.
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"""
|
|
|
|
def configure(self):
|
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"""Do the configuration."""
|
|
|
|
config = self.config
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|
if 'version' not in config:
|
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raise ValueError("dictionary doesn't specify a version")
|
|
if config['version'] != 1:
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raise ValueError("Unsupported version: %s" % config['version'])
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incremental = config.pop('incremental', False)
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EMPTY_DICT = {}
|
|
logging._acquireLock()
|
|
try:
|
|
if incremental:
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|
handlers = config.get('handlers', EMPTY_DICT)
|
|
for name in handlers:
|
|
if name not in logging._handlers:
|
|
raise ValueError('No handler found with '
|
|
'name %r' % name)
|
|
else:
|
|
try:
|
|
handler = logging._handlers[name]
|
|
handler_config = handlers[name]
|
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level = handler_config.get('level', None)
|
|
if level:
|
|
handler.setLevel(logging._checkLevel(level))
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure handler '
|
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'%r: %s' % (name, e))
|
|
loggers = config.get('loggers', EMPTY_DICT)
|
|
for name in loggers:
|
|
try:
|
|
self.configure_logger(name, loggers[name], True)
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure logger '
|
|
'%r: %s' % (name, e))
|
|
root = config.get('root', None)
|
|
if root:
|
|
try:
|
|
self.configure_root(root, True)
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure root '
|
|
'logger: %s' % e)
|
|
else:
|
|
disable_existing = config.pop('disable_existing_loggers', True)
|
|
|
|
logging._handlers.clear()
|
|
del logging._handlerList[:]
|
|
|
|
# Do formatters first - they don't refer to anything else
|
|
formatters = config.get('formatters', EMPTY_DICT)
|
|
for name in formatters:
|
|
try:
|
|
formatters[name] = self.configure_formatter(
|
|
formatters[name])
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure '
|
|
'formatter %r: %s' % (name, e))
|
|
# Next, do filters - they don't refer to anything else, either
|
|
filters = config.get('filters', EMPTY_DICT)
|
|
for name in filters:
|
|
try:
|
|
filters[name] = self.configure_filter(filters[name])
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure '
|
|
'filter %r: %s' % (name, e))
|
|
|
|
# Next, do handlers - they refer to formatters and filters
|
|
# As handlers can refer to other handlers, sort the keys
|
|
# to allow a deterministic order of configuration
|
|
handlers = config.get('handlers', EMPTY_DICT)
|
|
for name in sorted(handlers):
|
|
try:
|
|
handler = self.configure_handler(handlers[name])
|
|
handler.name = name
|
|
handlers[name] = handler
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure handler '
|
|
'%r: %s' % (name, e))
|
|
# Next, do loggers - they refer to handlers and filters
|
|
|
|
#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.
|
|
root = logging.root
|
|
existing = list(root.manager.loggerDict.keys())
|
|
#The list needs to be sorted so that we can
|
|
#avoid disabling child loggers of explicitly
|
|
#named loggers. With a sorted list it is easier
|
|
#to find the child loggers.
|
|
existing.sort()
|
|
#We'll keep the list of existing loggers
|
|
#which are children of named loggers here...
|
|
child_loggers = []
|
|
#now set up the new ones...
|
|
loggers = config.get('loggers', EMPTY_DICT)
|
|
for name in loggers:
|
|
if name in existing:
|
|
i = existing.index(name) + 1 # look after name
|
|
prefixed = name + "."
|
|
pflen = len(prefixed)
|
|
num_existing = len(existing)
|
|
while i < num_existing:
|
|
if existing[i][:pflen] == prefixed:
|
|
child_loggers.append(existing[i])
|
|
i += 1
|
|
existing.remove(name)
|
|
try:
|
|
self.configure_logger(name, loggers[name])
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure logger '
|
|
'%r: %s' % (name, e))
|
|
|
|
#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.
|
|
#However, don't disable children of named loggers, as that's
|
|
#probably not what was intended by the user.
|
|
#for log in existing:
|
|
# logger = root.manager.loggerDict[log]
|
|
# if log in child_loggers:
|
|
# logger.level = logging.NOTSET
|
|
# logger.handlers = []
|
|
# logger.propagate = True
|
|
# elif disable_existing:
|
|
# logger.disabled = True
|
|
_handle_existing_loggers(existing, child_loggers,
|
|
disable_existing)
|
|
|
|
# And finally, do the root logger
|
|
root = config.get('root', None)
|
|
if root:
|
|
try:
|
|
self.configure_root(root)
|
|
except Exception as e:
|
|
raise ValueError('Unable to configure root '
|
|
'logger: %s' % e)
|
|
finally:
|
|
logging._releaseLock()
|
|
|
|
def configure_formatter(self, config):
|
|
"""Configure a formatter from a dictionary."""
|
|
if '()' in config:
|
|
factory = config['()'] # for use in exception handler
|
|
try:
|
|
result = self.configure_custom(config)
|
|
except TypeError as te:
|
|
if "'format'" not in str(te):
|
|
raise
|
|
#Name of parameter changed from fmt to format.
|
|
#Retry with old name.
|
|
#This is so that code can be used with older Python versions
|
|
#(e.g. by Django)
|
|
config['fmt'] = config.pop('format')
|
|
config['()'] = factory
|
|
result = self.configure_custom(config)
|
|
else:
|
|
fmt = config.get('format', None)
|
|
dfmt = config.get('datefmt', None)
|
|
result = logging.Formatter(fmt, dfmt)
|
|
return result
|
|
|
|
def configure_filter(self, config):
|
|
"""Configure a filter from a dictionary."""
|
|
if '()' in config:
|
|
result = self.configure_custom(config)
|
|
else:
|
|
name = config.get('name', '')
|
|
result = logging.Filter(name)
|
|
return result
|
|
|
|
def add_filters(self, filterer, filters):
|
|
"""Add filters to a filterer from a list of names."""
|
|
for f in filters:
|
|
try:
|
|
filterer.addFilter(self.config['filters'][f])
|
|
except Exception as e:
|
|
raise ValueError('Unable to add filter %r: %s' % (f, e))
|
|
|
|
def configure_handler(self, config):
|
|
"""Configure a handler from a dictionary."""
|
|
formatter = config.pop('formatter', None)
|
|
if formatter:
|
|
try:
|
|
formatter = self.config['formatters'][formatter]
|
|
except Exception as e:
|
|
raise ValueError('Unable to set formatter '
|
|
'%r: %s' % (formatter, e))
|
|
level = config.pop('level', None)
|
|
filters = config.pop('filters', None)
|
|
if '()' in config:
|
|
c = config.pop('()')
|
|
if not callable(c):
|
|
c = self.resolve(c)
|
|
factory = c
|
|
else:
|
|
klass = self.resolve(config.pop('class'))
|
|
#Special case for handler which refers to another handler
|
|
if issubclass(klass, logging.handlers.MemoryHandler) and\
|
|
'target' in config:
|
|
try:
|
|
config['target'] = self.config['handlers'][config['target']]
|
|
except Exception as e:
|
|
raise ValueError('Unable to set target handler '
|
|
'%r: %s' % (config['target'], e))
|
|
elif issubclass(klass, logging.handlers.SMTPHandler) and\
|
|
'mailhost' in config:
|
|
config['mailhost'] = self.as_tuple(config['mailhost'])
|
|
elif issubclass(klass, logging.handlers.SysLogHandler) and\
|
|
'address' in config:
|
|
config['address'] = self.as_tuple(config['address'])
|
|
factory = klass
|
|
props = config.pop('.', None)
|
|
kwargs = dict([(k, config[k]) for k in config if valid_ident(k)])
|
|
try:
|
|
result = factory(**kwargs)
|
|
except TypeError as te:
|
|
if "'stream'" not in str(te):
|
|
raise
|
|
#The argument name changed from strm to stream
|
|
#Retry with old name.
|
|
#This is so that code can be used with older Python versions
|
|
#(e.g. by Django)
|
|
kwargs['strm'] = kwargs.pop('stream')
|
|
result = factory(**kwargs)
|
|
if formatter:
|
|
result.setFormatter(formatter)
|
|
if level is not None:
|
|
result.setLevel(logging._checkLevel(level))
|
|
if filters:
|
|
self.add_filters(result, filters)
|
|
if props:
|
|
for name, value in props.items():
|
|
setattr(result, name, value)
|
|
return result
|
|
|
|
def add_handlers(self, logger, handlers):
|
|
"""Add handlers to a logger from a list of names."""
|
|
for h in handlers:
|
|
try:
|
|
logger.addHandler(self.config['handlers'][h])
|
|
except Exception as e:
|
|
raise ValueError('Unable to add handler %r: %s' % (h, e))
|
|
|
|
def common_logger_config(self, logger, config, incremental=False):
|
|
"""
|
|
Perform configuration which is common to root and non-root loggers.
|
|
"""
|
|
level = config.get('level', None)
|
|
if level is not None:
|
|
logger.setLevel(logging._checkLevel(level))
|
|
if not incremental:
|
|
#Remove any existing handlers
|
|
for h in logger.handlers[:]:
|
|
logger.removeHandler(h)
|
|
handlers = config.get('handlers', None)
|
|
if handlers:
|
|
self.add_handlers(logger, handlers)
|
|
filters = config.get('filters', None)
|
|
if filters:
|
|
self.add_filters(logger, filters)
|
|
|
|
def configure_logger(self, name, config, incremental=False):
|
|
"""Configure a non-root logger from a dictionary."""
|
|
logger = logging.getLogger(name)
|
|
self.common_logger_config(logger, config, incremental)
|
|
propagate = config.get('propagate', None)
|
|
if propagate is not None:
|
|
logger.propagate = propagate
|
|
|
|
def configure_root(self, config, incremental=False):
|
|
"""Configure a root logger from a dictionary."""
|
|
root = logging.getLogger()
|
|
self.common_logger_config(root, config, incremental)
|
|
|
|
dictConfigClass = DictConfigurator
|
|
|
|
def dictConfig(config):
|
|
"""Configure logging using a dictionary."""
|
|
dictConfigClass(config).configure()
|
|
|
|
|
|
def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None):
|
|
"""
|
|
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().
|
|
|
|
Use the ``verify`` argument to verify any bytes received across the wire
|
|
from a client. If specified, it should be a callable which receives a
|
|
single argument - the bytes of configuration data received across the
|
|
network - and it should return either ``None``, to indicate that the
|
|
passed in bytes could not be verified and should be discarded, or a
|
|
byte string which is then passed to the configuration machinery as
|
|
normal. Note that you can return transformed bytes, e.g. by decrypting
|
|
the bytes passed in.
|
|
"""
|
|
if not thread: #pragma: no cover
|
|
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, packed using
|
|
struct.pack(">L", n), followed by the config file.
|
|
Uses fileConfig() to do the grunt work.
|
|
"""
|
|
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))
|
|
if self.server.verify is not None:
|
|
chunk = self.server.verify(chunk)
|
|
if chunk is not None: # verified, can process
|
|
chunk = chunk.decode("utf-8")
|
|
try:
|
|
import json
|
|
d =json.loads(chunk)
|
|
assert isinstance(d, dict)
|
|
dictConfig(d)
|
|
except Exception:
|
|
#Apply new configuration.
|
|
|
|
file = io.StringIO(chunk)
|
|
try:
|
|
fileConfig(file)
|
|
except Exception:
|
|
traceback.print_exc()
|
|
if self.server.ready:
|
|
self.server.ready.set()
|
|
except OSError as e:
|
|
if not isinstance(e.args, tuple):
|
|
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, ready=None, verify=None):
|
|
ThreadingTCPServer.__init__(self, (host, port), handler)
|
|
logging._acquireLock()
|
|
self.abort = 0
|
|
logging._releaseLock()
|
|
self.timeout = 1
|
|
self.ready = ready
|
|
self.verify = verify
|
|
|
|
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()
|
|
self.socket.close()
|
|
|
|
class Server(threading.Thread):
|
|
|
|
def __init__(self, rcvr, hdlr, port, verify):
|
|
super(Server, self).__init__()
|
|
self.rcvr = rcvr
|
|
self.hdlr = hdlr
|
|
self.port = port
|
|
self.verify = verify
|
|
self.ready = threading.Event()
|
|
|
|
def run(self):
|
|
server = self.rcvr(port=self.port, handler=self.hdlr,
|
|
ready=self.ready,
|
|
verify=self.verify)
|
|
if self.port == 0:
|
|
self.port = server.server_address[1]
|
|
self.ready.set()
|
|
global _listener
|
|
logging._acquireLock()
|
|
_listener = server
|
|
logging._releaseLock()
|
|
server.serve_until_stopped()
|
|
|
|
return Server(ConfigSocketReceiver, ConfigStreamHandler, port, verify)
|
|
|
|
def stopListening():
|
|
"""
|
|
Stop the listening server which was created with a call to listen().
|
|
"""
|
|
global _listener
|
|
logging._acquireLock()
|
|
try:
|
|
if _listener:
|
|
_listener.abort = 1
|
|
_listener = None
|
|
finally:
|
|
logging._releaseLock()
|