335 lines
14 KiB
Python
335 lines
14 KiB
Python
# Copyright 2013 Red Hat Inc.
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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 import block_device
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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 import 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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LOG = logging.getLogger(__name__)
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_BLOCK_DEVICE_OPTIONAL_JOINED_FIELD = ['instance']
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BLOCK_DEVICE_OPTIONAL_ATTRS = _BLOCK_DEVICE_OPTIONAL_JOINED_FIELD
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def _expected_cols(expected_attrs):
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return [attr for attr in expected_attrs
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if attr in _BLOCK_DEVICE_OPTIONAL_JOINED_FIELD]
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# TODO(berrange): Remove NovaObjectDictCompat
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@base.NovaObjectRegistry.register
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class BlockDeviceMapping(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: Add instance_uuid to get_by_volume_id method
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# Version 1.2: Instance version 1.14
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# Version 1.3: Instance version 1.15
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# Version 1.4: Instance version 1.16
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# Version 1.5: Instance version 1.17
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# Version 1.6: Instance version 1.18
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# Version 1.7: Add update_or_create method
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# Version 1.8: Instance version 1.19
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# Version 1.9: Instance version 1.20
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# Version 1.10: Changed source_type field to BlockDeviceSourceTypeField.
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# Version 1.11: Changed destination_type field to
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# BlockDeviceDestinationTypeField.
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# Version 1.12: Changed device_type field to BlockDeviceTypeField.
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# Version 1.13: Instance version 1.21
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# Version 1.14: Instance version 1.22
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# Version 1.15: Instance version 1.23
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VERSION = '1.15'
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fields = {
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'id': fields.IntegerField(),
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'instance_uuid': fields.UUIDField(),
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'instance': fields.ObjectField('Instance', nullable=True),
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'source_type': fields.BlockDeviceSourceTypeField(nullable=True),
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'destination_type': fields.BlockDeviceDestinationTypeField(
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nullable=True),
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'guest_format': fields.StringField(nullable=True),
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'device_type': fields.BlockDeviceTypeField(nullable=True),
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'disk_bus': fields.StringField(nullable=True),
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'boot_index': fields.IntegerField(nullable=True),
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'device_name': fields.StringField(nullable=True),
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'delete_on_termination': fields.BooleanField(default=False),
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'snapshot_id': fields.StringField(nullable=True),
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'volume_id': fields.StringField(nullable=True),
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'volume_size': fields.IntegerField(nullable=True),
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'image_id': fields.StringField(nullable=True),
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'no_device': fields.BooleanField(default=False),
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'connection_info': fields.StringField(nullable=True),
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}
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@staticmethod
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def _from_db_object(context, block_device_obj,
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db_block_device, expected_attrs=None):
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if expected_attrs is None:
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expected_attrs = []
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for key in block_device_obj.fields:
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if key in BLOCK_DEVICE_OPTIONAL_ATTRS:
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continue
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block_device_obj[key] = db_block_device[key]
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if 'instance' in expected_attrs:
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my_inst = objects.Instance(context)
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my_inst._from_db_object(context, my_inst,
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db_block_device['instance'])
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block_device_obj.instance = my_inst
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block_device_obj._context = context
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block_device_obj.obj_reset_changes()
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return block_device_obj
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def _create(self, context, update_or_create=False):
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"""Create the block device record in the database.
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In case the id field is set on the object, and if the instance is set
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raise an ObjectActionError. Resets all the changes on the object.
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Returns None
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:param context: security context used for database calls
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:param update_or_create: consider existing block devices for the
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instance based on the device name and swap, and only update
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the ones that match. Normally only used when creating the
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instance for the first time.
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"""
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cell_type = cells_opts.get_cell_type()
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if cell_type == 'api':
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raise exception.ObjectActionError(
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action='create',
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reason='BlockDeviceMapping cannot be '
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'created in the API cell.')
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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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updates = self.obj_get_changes()
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if 'instance' in updates:
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raise exception.ObjectActionError(action='create',
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reason='instance assigned')
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cells_create = update_or_create or None
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if update_or_create:
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db_bdm = db.block_device_mapping_update_or_create(
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context, updates, legacy=False)
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else:
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db_bdm = db.block_device_mapping_create(
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context, updates, legacy=False)
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self._from_db_object(context, self, db_bdm)
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# NOTE(alaski): bdms are looked up by instance uuid and device_name
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# so if we sync up with no device_name an entry will be created that
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# will not be found on a later update_or_create call and a second bdm
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# create will occur.
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if cell_type == 'compute' and db_bdm.get('device_name') is not None:
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cells_api = cells_rpcapi.CellsAPI()
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cells_api.bdm_update_or_create_at_top(
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context, self, create=cells_create)
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@base.remotable
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def create(self):
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self._create(self._context)
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@base.remotable
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def update_or_create(self):
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self._create(self._context, update_or_create=True)
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@base.remotable
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def destroy(self):
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if not self.obj_attr_is_set('id'):
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raise exception.ObjectActionError(action='destroy',
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reason='already destroyed')
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db.block_device_mapping_destroy(self._context, self.id)
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delattr(self, base.get_attrname('id'))
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cell_type = cells_opts.get_cell_type()
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if cell_type == 'compute':
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cells_api = cells_rpcapi.CellsAPI()
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cells_api.bdm_destroy_at_top(self._context, self.instance_uuid,
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device_name=self.device_name,
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volume_id=self.volume_id)
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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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if 'instance' in updates:
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raise exception.ObjectActionError(action='save',
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reason='instance changed')
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updates.pop('id', None)
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updated = db.block_device_mapping_update(self._context, self.id,
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updates, legacy=False)
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if not updated:
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raise exception.BDMNotFound(id=self.id)
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self._from_db_object(self._context, self, updated)
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cell_type = cells_opts.get_cell_type()
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if cell_type == 'compute':
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create = False
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# NOTE(alaski): If the device name has just been set this bdm
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# likely does not exist in the parent cell and we should create it.
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# If this is a modification of the device name we should update
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# rather than create which is why None is used here instead of True
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if 'device_name' in updates:
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create = None
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cells_api = cells_rpcapi.CellsAPI()
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cells_api.bdm_update_or_create_at_top(self._context, self,
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create=create)
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@base.remotable_classmethod
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def get_by_volume_id(cls, context, volume_id,
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instance_uuid=None, expected_attrs=None):
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if expected_attrs is None:
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expected_attrs = []
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db_bdm = db.block_device_mapping_get_by_volume_id(
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context, volume_id, _expected_cols(expected_attrs))
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if not db_bdm:
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raise exception.VolumeBDMNotFound(volume_id=volume_id)
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# NOTE (ndipanov): Move this to the db layer into a
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# get_by_instance_and_volume_id method
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if instance_uuid and instance_uuid != db_bdm['instance_uuid']:
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raise exception.InvalidVolume(
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reason=_("Volume does not belong to the "
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"requested instance."))
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return cls._from_db_object(context, cls(), db_bdm,
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expected_attrs=expected_attrs)
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@property
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def is_root(self):
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return self.boot_index == 0
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@property
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def is_volume(self):
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return (self.destination_type ==
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fields.BlockDeviceDestinationType.VOLUME)
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@property
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def is_image(self):
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return self.source_type == fields.BlockDeviceSourceType.IMAGE
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def get_image_mapping(self):
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return block_device.BlockDeviceDict(self).get_image_mapping()
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def obj_load_attr(self, attrname):
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if attrname not in BLOCK_DEVICE_OPTIONAL_ATTRS:
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raise exception.ObjectActionError(
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action='obj_load_attr',
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reason='attribute %s not lazy-loadable' % attrname)
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if not self._context:
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raise exception.OrphanedObjectError(method='obj_load_attr',
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objtype=self.obj_name())
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LOG.debug("Lazy-loading `%(attr)s' on %(name)s uuid %(uuid)s",
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{'attr': attrname,
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'name': self.obj_name(),
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'uuid': self.uuid,
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})
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self.instance = objects.Instance.get_by_uuid(self._context,
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self.instance_uuid)
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self.obj_reset_changes(fields=['instance'])
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@base.NovaObjectRegistry.register
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class BlockDeviceMappingList(base.ObjectListBase, base.NovaObject):
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# Version 1.0: Initial version
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# Version 1.1: BlockDeviceMapping <= version 1.1
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# Version 1.2: Added use_slave to get_by_instance_uuid
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# Version 1.3: BlockDeviceMapping <= version 1.2
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# Version 1.4: BlockDeviceMapping <= version 1.3
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# Version 1.5: BlockDeviceMapping <= version 1.4
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# Version 1.6: BlockDeviceMapping <= version 1.5
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# Version 1.7: BlockDeviceMapping <= version 1.6
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# Version 1.8: BlockDeviceMapping <= version 1.7
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# Version 1.9: BlockDeviceMapping <= version 1.8
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# Version 1.10: BlockDeviceMapping <= version 1.9
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# Version 1.11: BlockDeviceMapping <= version 1.10
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# Version 1.12: BlockDeviceMapping <= version 1.11
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# Version 1.13: BlockDeviceMapping <= version 1.12
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# Version 1.14: BlockDeviceMapping <= version 1.13
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# Version 1.15: BlockDeviceMapping <= version 1.14
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# Version 1.16: BlockDeviceMapping <= version 1.15
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# Version 1.17: Add get_by_instance_uuids()
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VERSION = '1.17'
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fields = {
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'objects': fields.ListOfObjectsField('BlockDeviceMapping'),
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}
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@property
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def instance_uuids(self):
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return set(
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bdm.instance_uuid for bdm in self
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if bdm.obj_attr_is_set('instance_uuid')
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)
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@classmethod
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def bdms_by_instance_uuid(cls, context, instance_uuids):
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bdms = cls.get_by_instance_uuids(context, instance_uuids)
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return base.obj_make_dict_of_lists(
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context, cls, bdms, 'instance_uuid')
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@base.remotable_classmethod
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def get_by_instance_uuids(cls, context, instance_uuids, use_slave=False):
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db_bdms = db.block_device_mapping_get_all_by_instance_uuids(
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context, instance_uuids, use_slave=use_slave)
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return base.obj_make_list(
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context, cls(), objects.BlockDeviceMapping, db_bdms or [])
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@base.remotable_classmethod
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def get_by_instance_uuid(cls, context, instance_uuid, use_slave=False):
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db_bdms = db.block_device_mapping_get_all_by_instance(
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context, instance_uuid, use_slave=use_slave)
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return base.obj_make_list(
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context, cls(), objects.BlockDeviceMapping, db_bdms or [])
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def root_bdm(self):
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"""It only makes sense to call this method when the
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BlockDeviceMappingList contains BlockDeviceMappings from
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exactly one instance rather than BlockDeviceMappings from
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multiple instances.
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For example, you should not call this method from a
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BlockDeviceMappingList created by get_by_instance_uuids(),
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but you may call this method from a BlockDeviceMappingList
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created by get_by_instance_uuid().
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"""
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if len(self.instance_uuids) > 1:
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raise exception.UndefinedRootBDM()
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try:
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return next(bdm_obj for bdm_obj in self if bdm_obj.is_root)
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except StopIteration:
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return
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def block_device_make_list(context, db_list, **extra_args):
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return base.obj_make_list(context,
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objects.BlockDeviceMappingList(context),
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objects.BlockDeviceMapping, db_list,
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**extra_args)
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def block_device_make_list_from_dicts(context, bdm_dicts_list):
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bdm_objects = [objects.BlockDeviceMapping(context=context, **bdm)
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for bdm in bdm_dicts_list]
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return BlockDeviceMappingList(objects=bdm_objects)
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