293 lines
11 KiB
Python
293 lines
11 KiB
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.
|
|
|
|
"""
|
|
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()
|