/
aggregate.py
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/
aggregate.py
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# Copyright 2013 IBM Corp.
#
# 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.
from nova.compute import utils as compute_utils
from nova import db
from nova import exception
from nova import objects
from nova.objects import base
from nova.objects import fields
# TODO(berrange): Remove NovaObjectDictCompat
@base.NovaObjectRegistry.register
class Aggregate(base.NovaPersistentObject, base.NovaObject,
base.NovaObjectDictCompat):
# Version 1.0: Initial version
# Version 1.1: String attributes updated to support unicode
VERSION = '1.1'
fields = {
'id': fields.IntegerField(),
'name': fields.StringField(),
'hosts': fields.ListOfStringsField(nullable=True),
'metadata': fields.DictOfStringsField(nullable=True),
}
obj_extra_fields = ['availability_zone']
@staticmethod
def _from_db_object(context, aggregate, db_aggregate):
for key in aggregate.fields:
if key == 'metadata':
db_key = 'metadetails'
else:
db_key = key
aggregate[key] = db_aggregate[db_key]
aggregate._context = context
aggregate.obj_reset_changes()
return aggregate
def _assert_no_hosts(self, action):
if 'hosts' in self.obj_what_changed():
raise exception.ObjectActionError(
action=action,
reason='hosts updated inline')
@base.remotable_classmethod
def get_by_id(cls, context, aggregate_id):
db_aggregate = db.aggregate_get(context, aggregate_id)
return cls._from_db_object(context, cls(), db_aggregate)
@base.remotable
def create(self):
if self.obj_attr_is_set('id'):
raise exception.ObjectActionError(action='create',
reason='already created')
self._assert_no_hosts('create')
updates = self.obj_get_changes()
payload = dict(updates)
if 'metadata' in updates:
# NOTE(danms): For some reason the notification format is weird
payload['meta_data'] = payload.pop('metadata')
compute_utils.notify_about_aggregate_update(self._context,
"create.start",
payload)
metadata = updates.pop('metadata', None)
db_aggregate = db.aggregate_create(self._context, updates,
metadata=metadata)
self._from_db_object(self._context, self, db_aggregate)
payload['aggregate_id'] = self.id
compute_utils.notify_about_aggregate_update(self._context,
"create.end",
payload)
@base.remotable
def save(self):
self._assert_no_hosts('save')
updates = self.obj_get_changes()
payload = {'aggregate_id': self.id}
if 'metadata' in updates:
payload['meta_data'] = updates['metadata']
compute_utils.notify_about_aggregate_update(self._context,
"updateprop.start",
payload)
updates.pop('id', None)
db_aggregate = db.aggregate_update(self._context, self.id, updates)
compute_utils.notify_about_aggregate_update(self._context,
"updateprop.end",
payload)
self._from_db_object(self._context, self, db_aggregate)
@base.remotable
def update_metadata(self, updates):
payload = {'aggregate_id': self.id,
'meta_data': updates}
compute_utils.notify_about_aggregate_update(self._context,
"updatemetadata.start",
payload)
to_add = {}
for key, value in updates.items():
if value is None:
try:
db.aggregate_metadata_delete(self._context, self.id, key)
except exception.AggregateMetadataNotFound:
pass
try:
self.metadata.pop(key)
except KeyError:
pass
else:
to_add[key] = value
self.metadata[key] = value
db.aggregate_metadata_add(self._context, self.id, to_add)
compute_utils.notify_about_aggregate_update(self._context,
"updatemetadata.end",
payload)
self.obj_reset_changes(fields=['metadata'])
@base.remotable
def destroy(self):
db.aggregate_delete(self._context, self.id)
@base.remotable
def add_host(self, host):
db.aggregate_host_add(self._context, self.id, host)
if self.hosts is None:
self.hosts = []
self.hosts.append(host)
self.obj_reset_changes(fields=['hosts'])
@base.remotable
def delete_host(self, host):
db.aggregate_host_delete(self._context, self.id, host)
self.hosts.remove(host)
self.obj_reset_changes(fields=['hosts'])
@property
def availability_zone(self):
return self.metadata.get('availability_zone', None)
@base.NovaObjectRegistry.register
class AggregateList(base.ObjectListBase, base.NovaObject):
# Version 1.0: Initial version
# Version 1.1: Added key argument to get_by_host()
# Aggregate <= version 1.1
# Version 1.2: Added get_by_metadata_key
VERSION = '1.2'
fields = {
'objects': fields.ListOfObjectsField('Aggregate'),
}
# NOTE(danms): Aggregate was at 1.1 before we added this
obj_relationships = {
'objects': [('1.0', '1.1'), ('1.1', '1.1'), ('1.2', '1.1')],
}
@classmethod
def _filter_db_aggregates(cls, db_aggregates, hosts):
if not isinstance(hosts, set):
hosts = set(hosts)
filtered_aggregates = []
for db_aggregate in db_aggregates:
for host in db_aggregate['hosts']:
if host in hosts:
filtered_aggregates.append(db_aggregate)
break
return filtered_aggregates
@base.remotable_classmethod
def get_all(cls, context):
db_aggregates = db.aggregate_get_all(context)
return base.obj_make_list(context, cls(context), objects.Aggregate,
db_aggregates)
@base.remotable_classmethod
def get_by_host(cls, context, host, key=None):
db_aggregates = db.aggregate_get_by_host(context, host, key=key)
return base.obj_make_list(context, cls(context), objects.Aggregate,
db_aggregates)
@base.remotable_classmethod
def get_by_metadata_key(cls, context, key, hosts=None):
db_aggregates = db.aggregate_get_by_metadata_key(context, key=key)
if hosts is not None:
db_aggregates = cls._filter_db_aggregates(db_aggregates, hosts)
return base.obj_make_list(context, cls(context), objects.Aggregate,
db_aggregates)