485f8a1606
Context attributes should be set by its __init__ only. Change-Id: I7c5b0b21e27384adec7049a6f5bb8454fa81ffb8
108 lines
3.0 KiB
Python
108 lines
3.0 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import threading
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class BaseContext(object):
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_elements = set()
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_context_stack = threading.local()
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def __init__(self, __mapping=None, **kwargs):
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if __mapping is None:
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self.__values = dict(**kwargs)
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else:
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if isinstance(__mapping, BaseContext):
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__mapping = __mapping.__values
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self.__values = dict(__mapping)
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self.__values.update(**kwargs)
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bad_keys = set(self.__values) - self._elements
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if bad_keys:
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raise TypeError("Only %s keys are supported. %s given" %
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(tuple(self._elements), tuple(bad_keys)))
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def __getattr__(self, name):
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try:
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return self.__values[name]
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except KeyError:
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if name in self._elements:
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return None
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else:
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raise AttributeError(name)
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def __setattr__(self, name, value):
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# NOTE(yorik-sar): only the very first assignment for __values is
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# allowed. All context arguments should be set at the time the context
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# object is being created.
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if not self.__dict__:
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super(BaseContext, self).__setattr__(name, value)
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else:
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raise Exception(self.__dict__, name, value)
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def __enter__(self):
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try:
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stack = self._context_stack.stack
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except AttributeError:
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stack = []
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self._context_stack.stack = stack
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stack.append(self)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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res = self._context_stack.stack.pop()
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assert res is self, "self should be the top element of the stack"
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@classmethod
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def current(cls):
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try:
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return cls._context_stack.stack[-1]
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except (AttributeError, IndexError):
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raise RuntimeError("Context isn't available here")
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# NOTE(yorik-sar): as long as oslo.rpc requires this
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def to_dict(self):
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return self.__values
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class ClimateContext(BaseContext):
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_elements = set([
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"user_id",
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"tenant_id",
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"auth_token",
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"service_catalog",
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"user_name",
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"tenant_name",
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"roles",
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"is_admin",
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])
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@classmethod
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def elevated(cls):
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try:
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ctx = cls.current()
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except RuntimeError:
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ctx = None
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return cls(ctx, is_admin=True)
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def current():
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return ClimateContext.current()
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def elevated():
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return ClimateContext.elevated()
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