119 lines
4.4 KiB
Python
119 lines
4.4 KiB
Python
# Copyright 2013 IBM Corp.
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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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from oslo_log import log as logging
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from nova.cells import opts as cells_opts
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from nova.cells import rpcapi as cells_rpcapi
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from nova.db import api as db
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from nova import exception
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from nova.objects import base
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from nova.objects import fields
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LOG = logging.getLogger(__name__)
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@base.NovaObjectRegistry.register
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class InstanceInfoCache(base.NovaPersistentObject, base.NovaObject):
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# Version 1.0: Initial version
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# Version 1.1: Converted network_info to store the model.
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# Version 1.2: Added new() and update_cells kwarg to save().
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# Version 1.3: Added delete()
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# Version 1.4: String attributes updated to support unicode
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# Version 1.5: Actually set the deleted, created_at, updated_at, and
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# deleted_at attributes
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VERSION = '1.5'
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fields = {
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'instance_uuid': fields.UUIDField(),
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'network_info': fields.Field(fields.NetworkModel(), nullable=True),
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}
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@staticmethod
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def _from_db_object(context, info_cache, db_obj):
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for field in info_cache.fields:
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setattr(info_cache, field, db_obj[field])
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info_cache.obj_reset_changes()
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info_cache._context = context
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return info_cache
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@classmethod
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def new(cls, context, instance_uuid):
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"""Create an InfoCache object that can be used to create the DB
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entry for the first time.
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When save()ing this object, the info_cache_update() DB call
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will properly handle creating it if it doesn't exist already.
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"""
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info_cache = cls()
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info_cache.instance_uuid = instance_uuid
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info_cache.network_info = None
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info_cache._context = context
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# Leave the fields dirty
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return info_cache
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@base.remotable_classmethod
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def get_by_instance_uuid(cls, context, instance_uuid):
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db_obj = db.instance_info_cache_get(context, instance_uuid)
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if not db_obj:
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raise exception.InstanceInfoCacheNotFound(
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instance_uuid=instance_uuid)
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return cls._from_db_object(context, cls(context), db_obj)
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@staticmethod
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def _info_cache_cells_update(ctxt, info_cache):
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cell_type = cells_opts.get_cell_type()
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if cell_type != 'compute':
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return
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cells_api = cells_rpcapi.CellsAPI()
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try:
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cells_api.instance_info_cache_update_at_top(ctxt, info_cache)
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except Exception:
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LOG.exception("Failed to notify cells of instance info "
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"cache update")
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@base.remotable
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def save(self, update_cells=True):
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if 'network_info' in self.obj_what_changed():
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if update_cells:
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stale_instance = self.obj_clone()
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nw_info_json = self.fields['network_info'].to_primitive(
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self, 'network_info', self.network_info)
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rv = db.instance_info_cache_update(self._context,
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self.instance_uuid,
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{'network_info': nw_info_json})
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self._from_db_object(self._context, self, rv)
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if update_cells:
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# Send a copy of ourselves before updates are applied so
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# that cells can tell what changed.
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self._info_cache_cells_update(self._context, stale_instance)
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self.obj_reset_changes()
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@base.remotable
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def delete(self):
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db.instance_info_cache_delete(self._context, self.instance_uuid)
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@base.remotable
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def refresh(self):
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current = self.__class__.get_by_instance_uuid(self._context,
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self.instance_uuid)
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current._context = None
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for field in self.fields:
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if (self.obj_attr_is_set(field) and
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getattr(self, field) != getattr(current, field)):
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setattr(self, field, getattr(current, field))
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self.obj_reset_changes()
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