60d90e5660
This adds a rpc context serializer to pass the context to the engine and executor. Change-Id: I6e76c7e28f475bb815f9184041bc8b848249d419
165 lines
4.6 KiB
Python
165 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 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 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 eventlet
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from oslo import messaging
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from pecan import hooks
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from mistral import exceptions as exc
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from mistral.openstack.common import jsonutils
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from mistral.openstack.common import log as logging
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from mistral import utils
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LOG = logging.getLogger(__name__)
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# TODO(rakhmerov): refactor all threadlocal things with mistral.utils
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_CTX_THREAD_LOCAL_NAME = "MISTRAL_APP_CTX_THREAD_LOCAL"
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class BaseContext(object):
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"""Container for context variables."""
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_elements = set()
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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 to_dict(self):
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return self.__values
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class MistralContext(BaseContext):
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_elements = set([
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"user_id",
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"project_id",
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"auth_token",
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"service_catalog",
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"user_name",
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"project_name",
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"roles",
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"is_admin",
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])
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def has_ctx():
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return utils.has_thread_local(_CTX_THREAD_LOCAL_NAME)
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def ctx():
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if not has_ctx():
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raise exc.ApplicationContextNotFoundException()
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return utils.get_thread_local(_CTX_THREAD_LOCAL_NAME)
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def set_ctx(new_ctx):
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utils.set_thread_local(_CTX_THREAD_LOCAL_NAME, new_ctx)
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def _wrapper(context, thread_desc, thread_group, func, *args, **kwargs):
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try:
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set_ctx(context)
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func(*args, **kwargs)
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except Exception as e:
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LOG.exception("Thread '%s' fails with exception: '%s'"
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% (thread_desc, e))
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if thread_group and not thread_group.exc:
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thread_group.exc = e
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thread_group.failed_thread = thread_desc
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finally:
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if thread_group:
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thread_group._on_thread_exit()
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set_ctx(None)
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def spawn(thread_description, func, *args, **kwargs):
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eventlet.spawn(_wrapper, ctx().clone(), thread_description,
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None, func, *args, **kwargs)
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def context_from_headers(headers):
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return MistralContext(
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user_id=headers.get('X-User-Id'),
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project_id=headers.get('X-Project-Id'),
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auth_token=headers.get('X-Auth-Token'),
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service_catalog=headers.get('X-Service-Catalog'),
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user_name=headers.get('X-User-Name'),
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project_name=headers.get('X-Project-Name'),
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roles=headers.get('X-Roles', "").split(",")
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)
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class JsonPayloadSerializer(messaging.NoOpSerializer):
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@staticmethod
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def serialize_entity(context, entity):
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return jsonutils.to_primitive(entity, convert_instances=True)
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class RpcContextSerializer(messaging.Serializer):
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def __init__(self, base=None):
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self._base = base or messaging.NoOpSerializer()
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def serialize_entity(self, context, entity):
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if not self._base:
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return entity
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return self._base.serialize_entity(context, entity)
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def deserialize_entity(self, context, entity):
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if not self._base:
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return entity
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return self._base.deserialize_entity(context, entity)
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def serialize_context(self, context):
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return context.to_dict()
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def deserialize_context(self, context):
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ctx = MistralContext(**context)
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set_ctx(ctx)
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return ctx
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class ContextHook(hooks.PecanHook):
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def before(self, state):
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request_ctx = context_from_headers(state.request.headers)
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set_ctx(request_ctx)
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def after(self, state):
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set_ctx(None)
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