/usr/lib/python3/dist-packages/os_win/utils/baseutils.py is in python3-os-win 3.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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#
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Base WMI utility class.
"""
import imp
import sys
import threading
import time
if sys.platform == 'win32':
import wmi
from oslo_log import log as logging
from oslo_utils import reflection
LOG = logging.getLogger(__name__)
class BaseUtils(object):
_WMI_CONS = {}
def _get_wmi_obj(self, moniker, **kwargs):
return wmi.WMI(moniker=moniker, **kwargs)
def _get_wmi_conn(self, moniker, **kwargs):
if sys.platform != 'win32':
return None
if kwargs:
return self._get_wmi_obj(moniker, **kwargs)
if moniker in self._WMI_CONS:
return self._WMI_CONS[moniker]
wmi_conn = self._get_wmi_obj(moniker)
self._WMI_CONS[moniker] = wmi_conn
return wmi_conn
class BaseUtilsVirt(BaseUtils):
_wmi_namespace = '//%s/root/virtualization/v2'
_os_version = None
_old_wmi = None
def __init__(self, host='.'):
self._vs_man_svc_attr = None
self._host = host
self._conn_attr = None
self._compat_conn_attr = None
@property
def _conn(self):
if not self._conn_attr:
self._conn_attr = self._get_wmi_conn(
self._wmi_namespace % self._host)
return self._conn_attr
@property
def _compat_conn(self):
if not self._compat_conn_attr:
if not BaseUtilsVirt._os_version:
# hostutils cannot be used for this, it would end up in
# a circular import.
os_version = wmi.WMI().Win32_OperatingSystem()[0].Version
BaseUtilsVirt._os_version = list(
map(int, os_version.split('.')))
if BaseUtilsVirt._os_version >= [6, 3]:
self._compat_conn_attr = self._conn
else:
self._compat_conn_attr = self._get_wmi_compat_conn(
moniker=self._wmi_namespace % self._host)
return self._compat_conn_attr
@property
def _vs_man_svc(self):
if self._vs_man_svc_attr:
return self._vs_man_svc_attr
vs_man_svc = self._compat_conn.Msvm_VirtualSystemManagementService()[0]
if BaseUtilsVirt._os_version >= [6, 3]:
# NOTE(claudiub): caching this property on Windows / Hyper-V Server
# 2012 (using the old WMI) can lead to memory leaks. PyMI doesn't
# have those issues, so we can safely cache it.
self._vs_man_svc_attr = vs_man_svc
return vs_man_svc
def _get_wmi_compat_conn(self, moniker, **kwargs):
# old WMI should be used on Windows / Hyper-V Server 2012 whenever
# .GetText_ is used (e.g.: AddResourceSettings). PyMI's and WMI's
# .GetText_ have different results.
if not BaseUtilsVirt._old_wmi:
old_wmi_path = "%s.py" % wmi.__path__[0]
BaseUtilsVirt._old_wmi = imp.load_source('old_wmi', old_wmi_path)
return BaseUtilsVirt._old_wmi.WMI(moniker=moniker, **kwargs)
def _get_wmi_obj(self, moniker, compatibility_mode=False, **kwargs):
if not BaseUtilsVirt._os_version:
# hostutils cannot be used for this, it would end up in
# a circular import.
os_version = wmi.WMI().Win32_OperatingSystem()[0].Version
BaseUtilsVirt._os_version = list(map(int, os_version.split('.')))
if not compatibility_mode or BaseUtilsVirt._os_version >= [6, 3]:
return wmi.WMI(moniker=moniker, **kwargs)
return self._get_wmi_compat_conn(moniker=moniker, **kwargs)
class SynchronizedMeta(type):
"""Use an rlock to synchronize all class methods."""
def __init__(cls, cls_name, bases, attrs):
super(SynchronizedMeta, cls).__init__(cls_name, bases, attrs)
rlock = threading.RLock()
for attr_name in attrs:
attr = getattr(cls, attr_name)
if callable(attr):
decorated = SynchronizedMeta._synchronize(
attr, cls_name, rlock)
setattr(cls, attr_name, decorated)
@staticmethod
def _synchronize(func, cls_name, rlock):
def wrapper(*args, **kwargs):
f_qual_name = reflection.get_callable_name(func)
t_request = time.time()
try:
with rlock:
t_acquire = time.time()
LOG.debug("Method %(method_name)s acquired rlock. "
"Waited %(time_wait)0.3fs",
dict(method_name=f_qual_name,
time_wait=t_acquire - t_request))
return func(*args, **kwargs)
finally:
t_release = time.time()
LOG.debug("Method %(method_name)s released rlock. "
"Held %(time_held)0.3fs",
dict(method_name=f_qual_name,
time_held=t_release - t_acquire))
return wrapper
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