# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# 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.
"""Generic exec utility that allows us to set the
execute and root_helper attributes for putils.
Some projects need their own execute wrapper
and root_helper settings, so this provides that hook.
"""
import threading
from oslo_concurrency import processutils as putils
from oslo_context import context as context_utils
from oslo_utils import encodeutils
from os_brick.privileged import rootwrap as priv_rootwrap
class Executor(object):
def __init__(self, root_helper, execute=None,
*args, **kwargs):
if execute is None:
execute = priv_rootwrap.execute
self.set_execute(execute)
self.set_root_helper(root_helper)
@staticmethod
def safe_decode(string):
return string and encodeutils.safe_decode(string, errors='ignore')
@classmethod
def make_putils_error_safe(cls, exc):
"""Converts ProcessExecutionError string attributes to unicode."""
for field in ('stderr', 'stdout', 'cmd', 'description'):
value = getattr(exc, field, None)
if value:
setattr(exc, field, cls.safe_decode(value))
def _execute(self, *args, **kwargs):
try:
result = self.__execute(*args, **kwargs)
if result:
result = (self.safe_decode(result[0]),
self.safe_decode(result[1]))
return result
except putils.ProcessExecutionError as e:
self.make_putils_error_safe(e)
raise
def set_execute(self, execute):
self.__execute = execute
def set_root_helper(self, helper):
self._root_helper = helper
class Thread(threading.Thread):
"""Thread class that inherits the parent's context.
This is useful when you are spawning a thread and want LOG entries to
display the right context information, such as the request.
"""
def __init__(self, *args, **kwargs):
# Store the caller's context as a private variable shared among threads
self.__context__ = context_utils.get_current()
super(Thread, self).__init__(*args, **kwargs)
def run(self):
# Store the context in the current thread's request store
if self.__context__:
self.__context__.update_store()
super(Thread, self).run()
