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# Copyright 2013 Red Hat, Inc.
#
# 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.
import logging
import threading
from oslo_utils import eventletutils
from oslo_utils import importutils
LOG = logging.getLogger(__name__)
eventlet = importutils.try_import('eventlet')
if eventlet and eventletutils.is_monkey_patched("thread"):
# Here we initialize module with the native python threading module
# if it was already monkey patched by eventlet/greenlet.
stdlib_threading = eventlet.patcher.original('threading')
else:
# Manage the case where we run this driver in a non patched environment
# and where user even so configure the driver to run heartbeat through
# a python thread, if we don't do that when the heartbeat will start
# we will facing an issue by trying to override the threading module.
stdlib_threading = threading
def version_is_compatible(imp_version, version):
"""Determine whether versions are compatible.
:param imp_version: The version implemented
:param version: The version requested by an incoming message.
"""
if imp_version is None:
return True
if version is None:
return False
version_parts = version.split('.')
imp_version_parts = imp_version.split('.')
try:
rev = version_parts[2]
except IndexError:
rev = 0
try:
imp_rev = imp_version_parts[2]
except IndexError:
imp_rev = 0
if int(version_parts[0]) != int(imp_version_parts[0]): # Major
return False
if int(version_parts[1]) > int(imp_version_parts[1]): # Minor
return False
if (int(version_parts[1]) == int(imp_version_parts[1]) and
int(rev) > int(imp_rev)): # Revision
return False
return True
class DummyLock(object):
def acquire(self):
pass
def release(self):
pass
def __enter__(self):
self.acquire()
def __exit__(self, type, value, traceback):
self.release()
def get_executor_with_context():
if eventletutils.is_monkey_patched('thread'):
LOG.debug("Threading is patched, using an eventlet executor")
return 'eventlet'
LOG.debug("Using a threading executor")
return 'threading'
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