0b9b37fe9a
The instance.unlock versioned notification is introduced in this patch. The unlock operation just changes the instance.locked to False in API, we send the notification after db operation. Change-Id: Ic750c33b4f88ba9c62ea8cba86915c6010f2cd6f blueprint: trigger-notifications-when-lock-unlock-instances
234 lines
9.5 KiB
Python
234 lines
9.5 KiB
Python
# All Rights Reserved.
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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 oslo_utils import excutils
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from oslo_versionedobjects import exception as ovo_exception
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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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from nova import rpc
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LOG = logging.getLogger(__name__)
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@base.NovaObjectRegistry.register_if(False)
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class NotificationObject(base.NovaObject):
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"""Base class for every notification related versioned object."""
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# Version 1.0: Initial version
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VERSION = '1.0'
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def __init__(self, **kwargs):
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super(NotificationObject, self).__init__(**kwargs)
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# The notification objects are created on the fly when nova emits the
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# notification. This causes that every object shows every field as
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# changed. We don't want to send this meaningless information so we
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# reset the object after creation.
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self.obj_reset_changes(recursive=False)
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@base.NovaObjectRegistry.register_notification
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class EventType(NotificationObject):
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# Version 1.0: Initial version
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# Version 1.1: New valid actions values are added to the
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# NotificationActionField enum
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# Version 1.2: DELETE value is added to the NotificationActionField enum
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# Version 1.3: Set of new values are added to NotificationActionField enum
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# Version 1.4: Another set of new values are added to
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# NotificationActionField enum
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# Version 1.5: Aggregate related values have been added to
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# NotificationActionField enum
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# Version 1.6: ADD_FIX_IP replaced with INTERFACE_ATTACH in
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# NotificationActionField enum
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# Version 1.7: REMOVE_FIXED_IP replaced with INTERFACE_DETACH in
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# NotificationActionField enum
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# Version 1.8: IMPORT value is added to NotificationActionField enum
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# Version 1.9: ADD_MEMBER value is added to NotificationActionField enum
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# Version 1.10: UPDATE_METADATA value is added to the
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# NotificationActionField enum
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# Version 1.11: LOCK is added to NotificationActionField enum
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# Version 1.12: UNLOCK is added to NotificationActionField enum
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VERSION = '1.12'
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fields = {
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'object': fields.StringField(nullable=False),
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'action': fields.NotificationActionField(nullable=False),
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'phase': fields.NotificationPhaseField(nullable=True),
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}
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def __init__(self, object, action, phase=None):
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super(EventType, self).__init__()
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self.object = object
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self.action = action
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self.phase = phase
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def to_notification_event_type_field(self):
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"""Serialize the object to the wire format."""
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s = '%s.%s' % (self.object, self.action)
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if self.phase:
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s += '.%s' % self.phase
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return s
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@base.NovaObjectRegistry.register_if(False)
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class NotificationPayloadBase(NotificationObject):
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"""Base class for the payload of versioned notifications."""
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# SCHEMA defines how to populate the payload fields. It is a dictionary
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# where every key value pair has the following format:
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# <payload_field_name>: (<data_source_name>,
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# <field_of_the_data_source>)
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# The <payload_field_name> is the name where the data will be stored in the
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# payload object, this field has to be defined as a field of the payload.
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# The <data_source_name> shall refer to name of the parameter passed as
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# kwarg to the payload's populate_schema() call and this object will be
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# used as the source of the data. The <field_of_the_data_source> shall be
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# a valid field of the passed argument.
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# The SCHEMA needs to be applied with the populate_schema() call before the
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# notification can be emitted.
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# The value of the payload.<payload_field_name> field will be set by the
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# <data_source_name>.<field_of_the_data_source> field. The
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# <data_source_name> will not be part of the payload object internal or
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# external representation.
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# Payload fields that are not set by the SCHEMA can be filled in the same
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# way as in any versioned object.
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SCHEMA = {}
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# Version 1.0: Initial version
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VERSION = '1.0'
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def __init__(self):
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super(NotificationPayloadBase, self).__init__()
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self.populated = not self.SCHEMA
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@rpc.if_notifications_enabled
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def populate_schema(self, **kwargs):
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"""Populate the object based on the SCHEMA and the source objects
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:param kwargs: A dict contains the source object at the key defined in
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the SCHEMA
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"""
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for key, (obj, field) in self.SCHEMA.items():
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source = kwargs[obj]
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# trigger lazy-load if possible
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try:
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setattr(self, key, getattr(source, field))
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# ObjectActionError - not lazy loadable field
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# NotImplementedError - obj_load_attr() is not even defined
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# OrphanedObjectError - lazy loadable field but context is None
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except (exception.ObjectActionError,
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NotImplementedError,
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exception.OrphanedObjectError,
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ovo_exception.OrphanedObjectError) as e:
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LOG.debug(("Defaulting the value of the field '%(field)s' "
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"to None in %(payload)s due to '%(exception)s'"),
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{'field': key,
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'payload': self.__class__.__name__,
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'exception': e})
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# NOTE(gibi): This will fail if the payload field is not
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# nullable, but that means that either the source object is not
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# properly initialized or the payload field needs to be defined
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# as nullable
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setattr(self, key, None)
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except Exception:
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with excutils.save_and_reraise_exception():
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LOG.error('Failed trying to populate attribute "%s" '
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'using field: %s', key, field)
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self.populated = True
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# the schema population will create changed fields but we don't need
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# this information in the notification
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self.obj_reset_changes(recursive=True)
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@base.NovaObjectRegistry.register_notification
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class NotificationPublisher(NotificationObject):
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# Version 1.0: Initial version
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# 2.0: The binary field has been renamed to source
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# 2.1: The type of the source field changed from string to enum.
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# This only needs a minor bump as the enum uses the possible
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# values of the previous string field
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# 2.2: New enum for source fields added
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VERSION = '2.2'
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fields = {
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'host': fields.StringField(nullable=False),
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'source': fields.NotificationSourceField(nullable=False),
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}
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def __init__(self, host, source):
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super(NotificationPublisher, self).__init__()
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self.host = host
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self.source = source
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@classmethod
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def from_service_obj(cls, service):
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source = fields.NotificationSource.get_source_by_binary(service.binary)
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return cls(host=service.host, source=source)
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@base.NovaObjectRegistry.register_if(False)
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class NotificationBase(NotificationObject):
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"""Base class for versioned notifications.
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Every subclass shall define a 'payload' field.
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"""
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# Version 1.0: Initial version
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VERSION = '1.0'
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fields = {
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'priority': fields.NotificationPriorityField(),
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'event_type': fields.ObjectField('EventType'),
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'publisher': fields.ObjectField('NotificationPublisher'),
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}
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def _emit(self, context, event_type, publisher_id, payload):
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notifier = rpc.get_versioned_notifier(publisher_id)
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notify = getattr(notifier, self.priority)
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notify(context, event_type=event_type, payload=payload)
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@rpc.if_notifications_enabled
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def emit(self, context):
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"""Send the notification."""
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assert self.payload.populated
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# Note(gibi): notification payload will be a newly populated object
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# therefore every field of it will look changed so this does not carry
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# any extra information so we drop this from the payload.
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self.payload.obj_reset_changes(recursive=True)
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self._emit(context,
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event_type=
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self.event_type.to_notification_event_type_field(),
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publisher_id='%s:%s' %
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(self.publisher.source,
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self.publisher.host),
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payload=self.payload.obj_to_primitive())
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def notification_sample(sample):
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"""Class decorator to attach the notification sample information
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to the notification object for documentation generation purposes.
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:param sample: the path of the sample json file relative to the
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doc/notification_samples/ directory in the nova repository
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root.
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"""
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def wrap(cls):
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if not getattr(cls, 'samples', None):
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cls.samples = [sample]
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else:
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cls.samples.append(sample)
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return cls
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return wrap
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