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# Copyright (C) 2011, 2013 Red Hat, Inc.
# Copyright (C) 2011 Cole Robinson <crobinso@redhat.com>
#
# This work is licensed under the GNU GPLv2 or later.
# See the COPYING file in the top-level directory.
# 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 re
import threading
import time
import traceback
from types import FunctionType
from virtinst import log
CHECK_MAINLOOP = False
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 or not CHECK_MAINLOOP):
tb = ""
if is_main_thread:
tb = "\n%s" % "".join(traceback.format_stack())
log.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__
log.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
log.debug("wrapmeth %s", fullname)
newfunc = generate_wrapper(methodobj, fullname)
setattr(classobj, name, newfunc)
def wrap_class(classobj):
log.debug("wrapclas %s %s", classobj, classobj.__name__)
for name in dir(classobj):
obj = getattr(classobj, name)
if isinstance(obj, FunctionType):
wrap_method(classobj, obj)
def wrap_module(module, mainloop, regex):
global CHECK_MAINLOOP
CHECK_MAINLOOP = mainloop
for name in dir(module):
if regex and not re.match(regex, name):
continue # pragma: no cover
obj = getattr(module, name)
if isinstance(obj, FunctionType):
wrap_func(module, obj)
if isinstance(obj, type):
wrap_class(obj)
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