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# 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.
cfg = None
_NOT_FOUND = object()
def get_oslo_config():
"""Runtime load the oslo.config object.
In performance optimization of openstackclient it was determined that even
optimistically loading oslo.config if available had a performance cost.
Given that we used to only raise the ImportError when the function was
called also attempt to do the import to do everything at runtime.
"""
global cfg
# First Call
if not cfg:
try:
from oslo_config import cfg
except ImportError:
cfg = _NOT_FOUND
if cfg is _NOT_FOUND:
raise ImportError("oslo.config is not an automatic dependency of "
"keystoneauth. If you wish to use oslo.config "
"you need to import it into your application's "
"requirements file. ")
return cfg
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