def4b17934
nova/db/__init__.py was importing * from nova.db.api. This meant that any time any code anywhere within the nova.db package was imported then nova.db.api was too, leading to a cascade of imports that may not have been desired. Also, in general, code in __init__.py is a pain. Therefore, this change adjusts code that so that either: * nova.db.api is used directly * nova.db.api is imported as 'db' In either case, the functionality remains the same. The primary goal of this change was to make it possible to import the model files without having to import the db api. Moving the model files to a different place in the directory hierarchy was considered, but given that "code in __init__.py is a pain" this mode was chosen. This looks like a very large change, but it is essentially adjusting package names, many in mocks. Change-Id: Ic1fd7c87ceda05eeb96735da2a415ef37060bb1a
234 lines
9.6 KiB
Python
234 lines
9.6 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_db import exception as db_exc
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from oslo_utils import uuidutils
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from oslo_utils import versionutils
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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.i18n import _
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from nova import objects
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from nova.objects import base
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from nova.objects import fields
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def determine_migration_type(migration):
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if migration['old_instance_type_id'] != migration['new_instance_type_id']:
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return 'resize'
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else:
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return 'migration'
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# TODO(berrange): Remove NovaObjectDictCompat
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@base.NovaObjectRegistry.register
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class Migration(base.NovaPersistentObject, base.NovaObject,
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base.NovaObjectDictCompat):
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# Version 1.0: Initial version
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# Version 1.1: String attributes updated to support unicode
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# Version 1.2: Added migration_type and hidden
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# Version 1.3: Added get_by_id_and_instance()
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# Version 1.4: Added migration progress detail
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# Version 1.5: Added uuid
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VERSION = '1.5'
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fields = {
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'id': fields.IntegerField(),
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'uuid': fields.UUIDField(),
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'source_compute': fields.StringField(nullable=True), # source hostname
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'dest_compute': fields.StringField(nullable=True), # dest hostname
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'source_node': fields.StringField(nullable=True), # source nodename
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'dest_node': fields.StringField(nullable=True), # dest nodename
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'dest_host': fields.StringField(nullable=True), # dest host IP
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'old_instance_type_id': fields.IntegerField(nullable=True),
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'new_instance_type_id': fields.IntegerField(nullable=True),
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'instance_uuid': fields.StringField(nullable=True),
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'status': fields.StringField(nullable=True),
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'migration_type': fields.EnumField(['migration', 'resize',
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'live-migration', 'evacuation'],
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nullable=False),
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'hidden': fields.BooleanField(nullable=False, default=False),
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'memory_total': fields.IntegerField(nullable=True),
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'memory_processed': fields.IntegerField(nullable=True),
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'memory_remaining': fields.IntegerField(nullable=True),
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'disk_total': fields.IntegerField(nullable=True),
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'disk_processed': fields.IntegerField(nullable=True),
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'disk_remaining': fields.IntegerField(nullable=True),
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}
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@staticmethod
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def _from_db_object(context, migration, db_migration):
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for key in migration.fields:
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value = db_migration[key]
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if key == 'migration_type' and value is None:
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value = determine_migration_type(db_migration)
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elif key == 'uuid' and value is None:
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continue
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migration[key] = value
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migration._context = context
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migration.obj_reset_changes()
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migration._ensure_uuid()
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return migration
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def obj_make_compatible(self, primitive, target_version):
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super(Migration, self).obj_make_compatible(primitive, target_version)
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target_version = versionutils.convert_version_to_tuple(target_version)
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if target_version < (1, 2):
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if 'migration_type' in primitive:
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del primitive['migration_type']
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del primitive['hidden']
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if target_version < (1, 4):
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if 'memory_total' in primitive:
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del primitive['memory_total']
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del primitive['memory_processed']
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del primitive['memory_remaining']
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del primitive['disk_total']
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del primitive['disk_processed']
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del primitive['disk_remaining']
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if target_version < (1, 5):
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if 'uuid' in primitive:
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del primitive['uuid']
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def obj_load_attr(self, attrname):
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if attrname == 'migration_type':
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# NOTE(danms): The only reason we'd need to load this is if
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# some older node sent us one. So, guess the type.
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self.migration_type = determine_migration_type(self)
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elif attrname == 'hidden':
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self.hidden = False
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else:
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super(Migration, self).obj_load_attr(attrname)
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def _ensure_uuid(self):
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if 'uuid' in self:
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return
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self.uuid = uuidutils.generate_uuid()
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try:
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self.save()
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except db_exc.DBDuplicateEntry:
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# NOTE(danms) We raced to generate a uuid for this,
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# so fetch the winner and use that uuid
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fresh = self.__class__.get_by_id(self.context, self.id)
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self.uuid = fresh.uuid
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@base.remotable_classmethod
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def get_by_id(cls, context, migration_id):
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db_migration = db.migration_get(context, migration_id)
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return cls._from_db_object(context, cls(), db_migration)
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@base.remotable_classmethod
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def get_by_id_and_instance(cls, context, migration_id, instance_uuid):
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db_migration = db.migration_get_by_id_and_instance(
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context, migration_id, instance_uuid)
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return cls._from_db_object(context, cls(), db_migration)
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@base.remotable_classmethod
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def get_by_instance_and_status(cls, context, instance_uuid, status):
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db_migration = db.migration_get_by_instance_and_status(
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context, instance_uuid, status)
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return cls._from_db_object(context, cls(), db_migration)
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@base.remotable
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def create(self):
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if self.obj_attr_is_set('id'):
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raise exception.ObjectActionError(action='create',
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reason='already created')
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if 'uuid' not in self:
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self.uuid = uuidutils.generate_uuid()
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updates = self.obj_get_changes()
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if 'migration_type' not in updates:
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raise exception.ObjectActionError(
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action="create",
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reason=_("cannot create a Migration object without a "
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"migration_type set"))
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db_migration = db.migration_create(self._context, updates)
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self._from_db_object(self._context, self, db_migration)
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@base.remotable
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def save(self):
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updates = self.obj_get_changes()
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updates.pop('id', None)
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db_migration = db.migration_update(self._context, self.id, updates)
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self._from_db_object(self._context, self, db_migration)
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self.obj_reset_changes()
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@property
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def instance(self):
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if not hasattr(self, '_cached_instance'):
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self._cached_instance = objects.Instance.get_by_uuid(
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self._context, self.instance_uuid)
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return self._cached_instance
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@instance.setter
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def instance(self, instance):
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self._cached_instance = instance
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@base.NovaObjectRegistry.register
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class MigrationList(base.ObjectListBase, base.NovaObject):
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# Version 1.0: Initial version
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# Migration <= 1.1
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# Version 1.1: Added use_slave to get_unconfirmed_by_dest_compute
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# Version 1.2: Migration version 1.2
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# Version 1.3: Added a new function to get in progress migrations
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# for an instance.
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# Version 1.4: Added sort_keys, sort_dirs, limit, marker kwargs to
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# get_by_filters for migrations pagination support.
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VERSION = '1.4'
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fields = {
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'objects': fields.ListOfObjectsField('Migration'),
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}
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@staticmethod
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@db.select_db_reader_mode
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def _db_migration_get_unconfirmed_by_dest_compute(
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context, confirm_window, dest_compute, use_slave=False):
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return db.migration_get_unconfirmed_by_dest_compute(
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context, confirm_window, dest_compute)
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@base.remotable_classmethod
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def get_unconfirmed_by_dest_compute(cls, context, confirm_window,
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dest_compute, use_slave=False):
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db_migrations = cls._db_migration_get_unconfirmed_by_dest_compute(
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context, confirm_window, dest_compute, use_slave=use_slave)
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return base.obj_make_list(context, cls(context), objects.Migration,
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db_migrations)
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@base.remotable_classmethod
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def get_in_progress_by_host_and_node(cls, context, host, node):
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db_migrations = db.migration_get_in_progress_by_host_and_node(
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context, host, node)
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return base.obj_make_list(context, cls(context), objects.Migration,
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db_migrations)
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@base.remotable_classmethod
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def get_by_filters(cls, context, filters, sort_keys=None, sort_dirs=None,
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limit=None, marker=None):
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db_migrations = db.migration_get_all_by_filters(
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context, filters, sort_keys=sort_keys, sort_dirs=sort_dirs,
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limit=limit, marker=marker)
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return base.obj_make_list(context, cls(context), objects.Migration,
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db_migrations)
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@base.remotable_classmethod
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def get_in_progress_by_instance(cls, context, instance_uuid,
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migration_type=None):
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db_migrations = db.migration_get_in_progress_by_instance(
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context, instance_uuid, migration_type)
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return base.obj_make_list(context, cls(context), objects.Migration,
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db_migrations)
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