Takashi Kajinami
72e60b5a28
Since Hyper-V driver was removed, we don't expect any use case where nova should be deployed in Windows OS. This scenario is no longer tested since WinStackers project has been retired. Drop the remaining code for Windows OS support to reduce unused code and focus purely on linux systems. Change-Id: I69b049d13556efe87f4be32f5e6e7f88e42f3b2a
86 lines
3.8 KiB
Python
86 lines
3.8 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# Copyright 2019 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Enable eventlet monkey patching."""
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import os
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def _monkey_patch():
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# NOTE(mdbooth): Anything imported here will not be monkey patched. It is
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# important to take care not to import anything here which requires monkey
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# patching.
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# NOTE(artom) eventlet processes environment variables at import-time.
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# as such any eventlet configuration should happen here if needed.
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import eventlet
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import sys
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# NOTE(mdbooth): Imports only sys (2019-01-30). Other modules imported at
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# runtime on execution of debugger.init().
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from nova import debugger
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# Note any modules with known monkey-patching issues which have been
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# imported before monkey patching.
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# urllib3: https://bugs.launchpad.net/nova/+bug/1808951
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# oslo_context.context: https://bugs.launchpad.net/nova/+bug/1773102
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problems = (set(['urllib3', 'oslo_context.context']) &
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set(sys.modules.keys()))
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if debugger.enabled():
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# turn off thread patching to enable the remote debugger
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eventlet.monkey_patch(thread=False)
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else:
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eventlet.monkey_patch()
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# Monkey patch the original current_thread to use the up-to-date _active
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# global variable. See https://bugs.launchpad.net/bugs/1863021 and
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# https://github.com/eventlet/eventlet/issues/592
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import __original_module_threading as orig_threading
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import threading
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orig_threading.current_thread.__globals__['_active'] = threading._active
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# NOTE(mdbooth): Log here instead of earlier to avoid loading oslo logging
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# before monkey patching.
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# NOTE(mdbooth): Ideally we would raise an exception here, as this is
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# likely to cause problems when executing nova code. However, some non-nova
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# tools load nova only to extract metadata and do not execute it. Two
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# examples are oslopolicy-policy-generator and sphinx, both of which can
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# fail if we assert here. It is not ideal that these utilities are monkey
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# patching at all, but we should not break them.
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# TODO(mdbooth): If there is any way to reliably determine if we are being
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# loaded in that kind of context without breaking existing callers, we
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# should do it and bypass monkey patching here entirely.
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if problems:
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from oslo_log import log as logging
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LOG = logging.getLogger(__name__)
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LOG.warning("Modules with known eventlet monkey patching issues were "
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"imported prior to eventlet monkey patching: %s. This "
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"warning can usually be ignored if the caller is only "
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"importing and not executing nova code.",
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', '.join(problems))
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# NOTE(mdbooth): This workaround is required to avoid breaking sphinx. See
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# separate comment in doc/source/conf.py. It may also be useful for other
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# non-nova utilities. Ideally the requirement for this workaround will be
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# removed as soon as possible, so do not rely on, or extend it.
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if (os.environ.get('OS_NOVA_DISABLE_EVENTLET_PATCHING', '').lower()
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not in ('1', 'true', 'yes')):
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_monkey_patch()
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