OpenStack Block Storage (Cinder)
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# Copyright 2015 Intel 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 oslo_log import log as logging
from oslo_utils import uuidutils
from oslo_utils import versionutils
from oslo_versionedobjects import fields
from cinder import db
from cinder import exception
from cinder.i18n import _
from cinder import objects
from cinder.objects import base
from cinder.objects import fields as c_fields
from cinder import utils
LOG = logging.getLogger(__name__)
@base.CinderObjectRegistry.register
class Service(base.CinderPersistentObject, base.CinderObject,
base.CinderObjectDictCompat, base.CinderComparableObject,
base.ClusteredObject):
# Version 1.0: Initial version
# Version 1.1: Add rpc_current_version and object_current_version fields
# Version 1.2: Add get_minimum_rpc_version() and get_minimum_obj_version()
# Version 1.3: Add replication fields
# Version 1.4: Add cluster fields
# Version 1.5: Add UUID field
# Version 1.6: Modify UUID field to be not nullable
VERSION = '1.6'
OPTIONAL_FIELDS = ('cluster',)
fields = {
'id': fields.IntegerField(),
'host': fields.StringField(nullable=True),
'binary': fields.StringField(nullable=True),
'cluster_name': fields.StringField(nullable=True),
'cluster': fields.ObjectField('Cluster', nullable=True,
read_only=True),
'topic': fields.StringField(nullable=True),
'report_count': fields.IntegerField(default=0),
'disabled': fields.BooleanField(default=False, nullable=True),
'availability_zone': fields.StringField(nullable=True,
default='cinder'),
'disabled_reason': fields.StringField(nullable=True),
'modified_at': fields.DateTimeField(nullable=True),
'rpc_current_version': fields.StringField(nullable=True),
'object_current_version': fields.StringField(nullable=True),
# Replication properties
'replication_status': c_fields.ReplicationStatusField(nullable=True),
'frozen': fields.BooleanField(default=False),
'active_backend_id': fields.StringField(nullable=True),
'uuid': fields.StringField(),
}
def obj_make_compatible(self, primitive, target_version):
"""Make a service representation compatible with a target version."""
# Convert all related objects
super(Service, self).obj_make_compatible(primitive, target_version)
target_version = versionutils.convert_version_to_tuple(target_version)
# Before v1.4 we didn't have cluster fields so we have to remove them.
if target_version < (1, 4):
for obj_field in ('cluster', 'cluster_name'):
primitive.pop(obj_field, None)
if target_version < (1, 5) and 'uuid' in primitive:
del primitive['uuid']
@staticmethod
def _from_db_object(context, service, db_service, expected_attrs=None):
expected_attrs = expected_attrs or []
for name, field in service.fields.items():
if ((name == 'uuid' and not db_service.get(name)) or
name in service.OPTIONAL_FIELDS):
continue
value = db_service.get(name)
if isinstance(field, fields.IntegerField):
value = value or 0
elif isinstance(field, fields.DateTimeField):
value = value or None
service[name] = value
service._context = context
if 'cluster' in expected_attrs:
db_cluster = db_service.get('cluster')
# If this service doesn't belong to a cluster the cluster field in
# the ORM instance will have value of None.
if db_cluster:
service.cluster = objects.Cluster(context)
objects.Cluster._from_db_object(context, service.cluster,
db_cluster)
else:
service.cluster = None
service.obj_reset_changes()
# TODO(jdg): Remove in S when we're sure all Services have UUID in db
if 'uuid' not in service:
service.uuid = uuidutils.generate_uuid()
LOG.debug('Generated UUID %(uuid)s for service %(id)i',
dict(uuid=service.uuid, id=service.id))
service.save()
return service
def obj_load_attr(self, attrname):
if attrname not in self.OPTIONAL_FIELDS:
raise exception.ObjectActionError(
action='obj_load_attr',
reason=_('attribute %s not lazy-loadable') % attrname)
if not self._context:
raise exception.OrphanedObjectError(method='obj_load_attr',
objtype=self.obj_name())
# NOTE(geguileo): We only have 1 optional field, so we don't need to
# confirm that we are loading the cluster.
# If this service doesn't belong to a cluster (cluster_name is empty),
# then cluster field will be None.
if self.cluster_name:
self.cluster = objects.Cluster.get_by_id(self._context, None,
name=self.cluster_name)
else:
self.cluster = None
self.obj_reset_changes(fields=(attrname,))
@classmethod
def get_by_host_and_topic(cls, context, host, topic, disabled=False):
db_service = db.service_get(context, disabled=disabled, host=host,
topic=topic)
return cls._from_db_object(context, cls(context), db_service)
@classmethod
def get_by_args(cls, context, host, binary_key):
db_service = db.service_get(context, host=host, binary=binary_key)
return cls._from_db_object(context, cls(context), db_service)
@classmethod
def get_by_uuid(cls, context, service_uuid):
db_service = db.service_get_by_uuid(context, service_uuid)
return cls._from_db_object(context, cls(), db_service)
def create(self):
if self.obj_attr_is_set('id'):
raise exception.ObjectActionError(action='create',
reason=_('already created'))
updates = self.cinder_obj_get_changes()
if 'cluster' in updates:
raise exception.ObjectActionError(
action='create', reason=_('cluster assigned'))
if 'uuid' not in updates:
updates['uuid'] = uuidutils.generate_uuid()
self.uuid = updates['uuid']
db_service = db.service_create(self._context, updates)
self._from_db_object(self._context, self, db_service)
def save(self):
updates = self.cinder_obj_get_changes()
if 'cluster' in updates:
raise exception.ObjectActionError(
action='save', reason=_('cluster changed'))
if updates:
db.service_update(self._context, self.id, updates)
self.obj_reset_changes()
def destroy(self):
with self.obj_as_admin():
updated_values = db.service_destroy(self._context, self.id)
self.update(updated_values)
self.obj_reset_changes(updated_values.keys())
@classmethod
def _get_minimum_version(cls, attribute, context, binary):
services = ServiceList.get_all_by_binary(context, binary)
min_ver = None
min_ver_str = None
for s in services:
ver_str = getattr(s, attribute)
if ver_str is None:
# NOTE(dulek) None in *_current_version means that this
# service is in Liberty version, which we now don't provide
# backward compatibility to.
msg = _('Service %s is in Liberty version. We do not provide '
'backward compatibility with Liberty now, so you '
'need to upgrade it, release by release if live '
'upgrade is required. After upgrade you may need to '
'remove any stale service records via '
'"cinder-manage service remove".') % s.binary
raise exception.ServiceTooOld(msg)
ver = versionutils.convert_version_to_int(ver_str)
if min_ver is None or ver < min_ver:
min_ver = ver
min_ver_str = ver_str
return min_ver_str
@classmethod
def get_minimum_rpc_version(cls, context, binary):
return cls._get_minimum_version('rpc_current_version', context, binary)
@classmethod
def get_minimum_obj_version(cls, context, binary=None):
return cls._get_minimum_version('object_current_version', context,
binary)
@property
def is_up(self):
"""Check whether a service is up based on last heartbeat."""
return (self.updated_at and
self.updated_at >= utils.service_expired_time(True))
@base.CinderObjectRegistry.register
class ServiceList(base.ObjectListBase, base.CinderObject):
# Version 1.0: Initial version
# Version 1.1: Service object 1.2
VERSION = '1.1'
fields = {
'objects': fields.ListOfObjectsField('Service'),
}
@classmethod
def get_all(cls, context, filters=None):
services = db.service_get_all(context, **(filters or {}))
return base.obj_make_list(context, cls(context), objects.Service,
services)
@classmethod
def get_all_by_topic(cls, context, topic, disabled=None):
services = db.service_get_all(context, topic=topic, disabled=disabled)
return base.obj_make_list(context, cls(context), objects.Service,
services)
@classmethod
def get_all_by_binary(cls, context, binary, disabled=None):
services = db.service_get_all(context, binary=binary,
disabled=disabled)
return base.obj_make_list(context, cls(context), objects.Service,
services)