63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
# 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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from oslo_log import log as logging
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from neutron.api.rpc.callbacks import exceptions
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from neutron.api.rpc.callbacks import resource_manager
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from neutron.objects import base
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LOG = logging.getLogger(__name__)
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# TODO(ajo): consider adding locking: it's safe for eventlet but not
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# for other types of threading.
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def _get_manager():
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return resource_manager.ProducerResourceCallbacksManager()
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def provide(callback, resource_type):
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"""Register a callback as a producer for the resource type.
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This callback will be used to produce resources of corresponding type for
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interested parties.
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"""
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_get_manager().register(callback, resource_type)
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def unprovide(callback, resource_type):
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"""Unregister a callback for corresponding resource type."""
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_get_manager().unregister(callback, resource_type)
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def clear():
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"""Clear all callbacks."""
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_get_manager().clear()
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def pull(resource_type, resource_id, **kwargs):
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"""Get resource object that corresponds to resource id.
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The function will return an object that is provided by resource producer.
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:returns: NeutronObject
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"""
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callback = _get_manager().get_callback(resource_type)
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obj = callback(resource_type, resource_id, **kwargs)
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if obj:
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if (not isinstance(obj, base.NeutronObject) or
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resource_type != obj.obj_name()):
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raise exceptions.CallbackWrongResourceType(
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resource_type=resource_type)
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return obj
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