d597ee271e
The right way to update these globals is to use a lock and ensure that nobody else is updating them at the same time. Also update a temporary dictionary before setting the global one so that nobody sees partial updates to the global one. This should help fix the thread-safety of shade (and other tooling built ontop of this library). Change-Id: Ie0e0369d98ba6a01edcbf447378a786eec3f13f9
53 lines
1.8 KiB
Python
53 lines
1.8 KiB
Python
# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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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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import json
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import os
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import threading
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_json_path = os.path.join(
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os.path.dirname(os.path.realpath(__file__)), 'defaults.json')
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_defaults = None
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_defaults_lock = threading.Lock()
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def get_defaults():
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global _defaults
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if _defaults is not None:
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return _defaults.copy()
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with _defaults_lock:
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if _defaults is not None:
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# Did someone else just finish filling it?
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return _defaults.copy()
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# Python language specific defaults
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# These are defaults related to use of python libraries, they are
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# not qualities of a cloud.
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#
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# NOTE(harlowja): update a in-memory dict, before updating
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# the global one so that other callers of get_defaults do not
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# see the partially filled one.
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tmp_defaults = dict(
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api_timeout=None,
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verify=True,
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cacert=None,
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cert=None,
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key=None,
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)
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with open(_json_path, 'r') as json_file:
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updates = json.load(json_file)
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if updates is not None:
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tmp_defaults.update(updates)
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_defaults = tmp_defaults
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return tmp_defaults.copy()
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