Current File : //proc/self/root/usr/share/virt-manager/virtManager/module_trace.py
#
# Copyright (C) 2011, 2013 Red Hat, Inc.
# Copyright (C) 2011 Cole Robinson <crobinso@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#
# This module provides a simple way to trace any activity on a specific
# python class or module. The trace output is logged using the regular
# logging infrastructure. Invoke this with virt-manager --trace-libvirt
import logging
import re
import threading
import time
import traceback
from types import FunctionType
from types import ClassType
from types import MethodType
def generate_wrapper(origfunc, name):
# This could be used as generic infrastructure, but it has hacks for
# identifying places where libvirt hits the network from the main thread,
# which causes UI blocking on slow network connections.
def newfunc(*args, **kwargs):
threadname = threading.current_thread().name
is_main_thread = (threading.current_thread().name == "MainThread")
# These APIs don't hit the network, so we might not want to see them.
is_non_network_libvirt_call = (name.endswith(".name") or
name.endswith(".UUIDString") or
name.endswith(".__init__") or
name.endswith(".__del__") or
name.endswith(".connect") or
name.startswith("libvirtError"))
if not is_non_network_libvirt_call and is_main_thread:
tb = ""
if is_main_thread:
tb = "\n%s" % "".join(traceback.format_stack())
logging.debug("TRACE %s: thread=%s: %s %s %s%s",
time.time(), threadname, name, args, kwargs, tb)
return origfunc(*args, **kwargs)
return newfunc
def wrap_func(module, funcobj):
name = funcobj.__name__
logging.debug("wrapfunc %s %s", funcobj, name)
newfunc = generate_wrapper(funcobj, name)
setattr(module, name, newfunc)
def wrap_method(classobj, methodobj):
name = methodobj.__name__
fullname = classobj.__name__ + "." + name
logging.debug("wrapmeth %s", fullname)
newfunc = generate_wrapper(methodobj, fullname)
setattr(classobj, name, newfunc)
def wrap_class(classobj):
logging.debug("wrapclas %s %s", classobj, classobj.__name__)
for name in dir(classobj):
obj = getattr(classobj, name)
if isinstance(obj, MethodType):
wrap_method(classobj, obj)
def wrap_module(module, regex=None):
for name in dir(module):
if regex and not re.match(regex, name):
continue
obj = getattr(module, name)
if isinstance(obj, FunctionType):
wrap_func(module, obj)
if isinstance(obj, (ClassType, type)):
wrap_class(obj)
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