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OpenStack Study: instance.py**** CubicPower OpenStack Study ****
# # 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.cells import opts as cells_opts from nova.cells import rpcapi as cells_rpcapi from nova.compute import flavors from nova import db from nova import exception from nova import notifications from nova.objects import base from nova.objects import fields from nova.objects import flavor as flavor_obj from nova.objects import instance_fault from nova.objects import instance_info_cache from nova.objects import pci_device from nova.objects import security_group from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova.openstack.common import timeutils from nova import utils from oslo.config import cfg CONF = cfg.CONF LOG = logging.getLogger(__name__) # List of fields that can be joined in DB layer. _INSTANCE_OPTIONAL_JOINED_FIELDS = ['metadata', 'system_metadata', 'info_cache', 'security_groups', 'pci_devices'] # These are fields that are optional but don't translate to db columns _INSTANCE_OPTIONAL_NON_COLUMN_FIELDS = ['fault'] # These are fields that can be specified as expected_attrs INSTANCE_OPTIONAL_ATTRS = (_INSTANCE_OPTIONAL_JOINED_FIELDS + _INSTANCE_OPTIONAL_NON_COLUMN_FIELDS) # These are fields that most query calls load by default INSTANCE_DEFAULT_FIELDS = ['metadata', 'system_metadata', 'info_cache', 'security_groups']
**** CubicPower OpenStack Study **** def _expected_cols(expected_attrs): """Return expected_attrs that are columns needing joining.""" if not expected_attrs: return expected_attrs return [attr for attr in expected_attrs if attr in _INSTANCE_OPTIONAL_JOINED_FIELDS]
**** CubicPower OpenStack Study **** class Instance(base.NovaPersistentObject, base.NovaObject): # Version 1.0: Initial version # Version 1.1: Added info_cache # Version 1.2: Added security_groups # Version 1.3: Added expected_vm_state and admin_state_reset to # save() # Version 1.4: Added locked_by and deprecated locked # Version 1.5: Added cleaned # Version 1.6: Added pci_devices # Version 1.7: String attributes updated to support unicode # Version 1.8: 'security_groups' and 'pci_devices' cannot be None # Version 1.9: Make uuid a non-None real string # Version 1.10: Added use_slave to refresh and get_by_uuid # Version 1.11: Update instance from database during destroy # Version 1.12: Added ephemeral_key_uuid # Version 1.13: Added delete_metadata_key() VERSION = '1.13' fields = { 'id': fields.IntegerField(), 'user_id': fields.StringField(nullable=True), 'project_id': fields.StringField(nullable=True), 'image_ref': fields.StringField(nullable=True), 'kernel_id': fields.StringField(nullable=True), 'ramdisk_id': fields.StringField(nullable=True), 'hostname': fields.StringField(nullable=True), 'launch_index': fields.IntegerField(nullable=True), 'key_name': fields.StringField(nullable=True), 'key_data': fields.StringField(nullable=True), 'power_state': fields.IntegerField(nullable=True), 'vm_state': fields.StringField(nullable=True), 'task_state': fields.StringField(nullable=True), 'memory_mb': fields.IntegerField(nullable=True), 'vcpus': fields.IntegerField(nullable=True), 'root_gb': fields.IntegerField(nullable=True), 'ephemeral_gb': fields.IntegerField(nullable=True), 'ephemeral_key_uuid': fields.UUIDField(nullable=True), 'host': fields.StringField(nullable=True), 'node': fields.StringField(nullable=True), 'instance_type_id': fields.IntegerField(nullable=True), 'user_data': fields.StringField(nullable=True), 'reservation_id': fields.StringField(nullable=True), 'scheduled_at': fields.DateTimeField(nullable=True), 'launched_at': fields.DateTimeField(nullable=True), 'terminated_at': fields.DateTimeField(nullable=True), 'availability_zone': fields.StringField(nullable=True), 'display_name': fields.StringField(nullable=True), 'display_description': fields.StringField(nullable=True), 'launched_on': fields.StringField(nullable=True), # NOTE(jdillaman): locked deprecated in favor of locked_by, # to be removed in Icehouse 'locked': fields.BooleanField(
**** CubicPower OpenStack Study **** def __init__(self, *args, **kwargs): super(Instance, self).__init__(*args, **kwargs) self._reset_metadata_tracking()
**** CubicPower OpenStack Study **** def _reset_metadata_tracking(self, fields=None): if fields is None or 'system_metadata' in fields: self._orig_system_metadata = (dict(self.system_metadata) if 'system_metadata' in self else {}) if fields is None or 'metadata' in fields: self._orig_metadata = (dict(self.metadata) if 'metadata' in self else {})
**** CubicPower OpenStack Study **** def obj_reset_changes(self, fields=None): super(Instance, self).obj_reset_changes(fields) self._reset_metadata_tracking(fields=fields)
**** CubicPower OpenStack Study **** def obj_what_changed(self): changes = super(Instance, self).obj_what_changed() if 'metadata' in self and self.metadata != self._orig_metadata: changes.add('metadata') if 'system_metadata' in self and (self.system_metadata != self._orig_system_metadata): changes.add('system_metadata') return changes @classmethod
**** CubicPower OpenStack Study **** def _obj_from_primitive(cls, context, objver, primitive): self = super(Instance, cls)._obj_from_primitive(context, objver, primitive) self._reset_metadata_tracking() return self
**** CubicPower OpenStack Study **** def obj_make_compatible(self, primitive, target_version): target_version = (int(target_version.split('.')[0]), int(target_version.split('.')[1])) unicode_attributes = ['user_id', 'project_id', 'image_ref', 'kernel_id', 'ramdisk_id', 'hostname', 'key_name', 'key_data', 'host', 'node', 'user_data', 'availability_zone', 'display_name', 'display_description', 'launched_on', 'locked_by', 'os_type', 'architecture', 'vm_mode', 'root_device_name', 'default_ephemeral_device', 'default_swap_device', 'config_drive', 'cell_name'] if target_version < (1, 10) and 'info_cache' in primitive: # NOTE(danms): Instance <= 1.9 (havana) had info_cache 1.4 self.info_cache.obj_make_compatible(primitive['info_cache'], '1.4') primitive['info_cache']['nova_object.version'] = '1.4' if target_version < (1, 7): # NOTE(danms): Before 1.7, we couldn't handle unicode in # string fields, so squash it here for field in [x for x in unicode_attributes if x in primitive and primitive[x] is not None]: primitive[field] = primitive[field].encode('ascii', 'replace') if target_version < (1, 6): # NOTE(danms): Before 1.6 there was no pci_devices list if 'pci_devices' in primitive: del primitive['pci_devices'] @property
**** CubicPower OpenStack Study **** def name(self): try: base_name = CONF.instance_name_template % self.id except TypeError: # Support templates like "uuid-%(uuid)s", etc. info = {} # NOTE(russellb): Don't use self.iteritems() here, as it will # result in infinite recursion on the name property. for key in self.fields: if key == 'name': # NOTE(danms): prevent recursion continue elif not self.obj_attr_is_set(key): # NOTE(danms): Don't trigger lazy-loads continue info[key] = self[key] try: base_name = CONF.instance_name_template % info except KeyError: base_name = self.uuid return base_name @staticmethod
**** CubicPower OpenStack Study **** def _from_db_object(context, instance, db_inst, expected_attrs=None): """Method to help with migration to objects. Converts a database entity to a formal object. """ if expected_attrs is None: expected_attrs = [] # Most of the field names match right now, so be quick for field in instance.fields: if field in INSTANCE_OPTIONAL_ATTRS: continue elif field == 'deleted': instance.deleted = db_inst['deleted'] == db_inst['id'] elif field == 'cleaned': instance.cleaned = db_inst['cleaned'] == 1 else: instance[field] = db_inst[field] if 'metadata' in expected_attrs: instance['metadata'] = utils.instance_meta(db_inst) if 'system_metadata' in expected_attrs: instance['system_metadata'] = utils.instance_sys_meta(db_inst) if 'fault' in expected_attrs: instance['fault'] = ( instance_fault.InstanceFault.get_latest_for_instance( context, instance.uuid)) if 'pci_devices' in expected_attrs: pci_devices = base.obj_make_list( context, pci_device.PciDeviceList(), pci_device.PciDevice, db_inst['pci_devices']) instance['pci_devices'] = pci_devices if 'info_cache' in expected_attrs: if db_inst['info_cache'] is None: instance.info_cache = None elif not instance.obj_attr_is_set('info_cache'): # TODO(danms): If this ever happens on a backlevel instance # passed to us by a backlevel service, things will break instance.info_cache = instance_info_cache.InstanceInfoCache() if instance.info_cache is not None: instance_info_cache.InstanceInfoCache._from_db_object( context, instance.info_cache, db_inst['info_cache']) if 'security_groups' in expected_attrs: sec_groups = base.obj_make_list( context, security_group.SecurityGroupList(), security_group.SecurityGroup, db_inst['security_groups']) instance['security_groups'] = sec_groups instance._context = context instance.obj_reset_changes() return instance @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_uuid(cls, context, uuid, expected_attrs=None, use_slave=False): if expected_attrs is None: expected_attrs = ['info_cache', 'security_groups'] columns_to_join = _expected_cols(expected_attrs) db_inst = db.instance_get_by_uuid(context, uuid, columns_to_join=columns_to_join, use_slave=use_slave) return cls._from_db_object(context, cls(), db_inst, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_id(cls, context, inst_id, expected_attrs=None): if expected_attrs is None: expected_attrs = ['info_cache', 'security_groups'] columns_to_join = _expected_cols(expected_attrs) db_inst = db.instance_get(context, inst_id, columns_to_join=columns_to_join) return cls._from_db_object(context, cls(), db_inst, expected_attrs) @base.remotable
**** CubicPower OpenStack Study **** def create(self, context): if self.obj_attr_is_set('id'): raise exception.ObjectActionError(action='create', reason='already created') updates = self.obj_get_changes() updates.pop('id', None) expected_attrs = [attr for attr in INSTANCE_DEFAULT_FIELDS if attr in updates] if 'security_groups' in updates: updates['security_groups'] = [x.name for x in updates['security_groups']] if 'info_cache' in updates: updates['info_cache'] = { 'network_info': updates['info_cache'].network_info.json() } db_inst = db.instance_create(context, updates) Instance._from_db_object(context, self, db_inst, expected_attrs) @base.remotable
**** CubicPower OpenStack Study **** def destroy(self, context): if not self.obj_attr_is_set('id'): raise exception.ObjectActionError(action='destroy', reason='already destroyed') if not self.obj_attr_is_set('uuid'): raise exception.ObjectActionError(action='destroy', reason='no uuid') if not self.obj_attr_is_set('host') or not self.host: # NOTE(danms): If our host is not set, avoid a race constraint = db.constraint(host=db.equal_any(None)) else: constraint = None try: db_inst = db.instance_destroy(context, self.uuid, constraint=constraint) Instance._from_db_object(context, self, db_inst) except exception.ConstraintNotMet: raise exception.ObjectActionError(action='destroy', reason='host changed') delattr(self, base.get_attrname('id'))
**** CubicPower OpenStack Study **** def _save_info_cache(self, context): self.info_cache.save(context)
**** CubicPower OpenStack Study **** def _save_security_groups(self, context): for secgroup in self.security_groups: secgroup.save(context) self.security_groups.obj_reset_changes()
**** CubicPower OpenStack Study **** def _save_fault(self, context): # NOTE(danms): I don't think we need to worry about this, do we? pass
**** CubicPower OpenStack Study **** def _save_pci_devices(self, context): # NOTE(yjiang5): All devices held by PCI tracker, only PCI tracker # permitted to update the DB. all change to devices from here will # be dropped. pass @base.remotable
**** CubicPower OpenStack Study **** def save(self, context, expected_vm_state=None, expected_task_state=None, admin_state_reset=False): """Save updates to this instance Column-wise updates will be made based on the result of self.what_changed(). If expected_task_state is provided, it will be checked against the in-database copy of the instance before updates are made. :param context: Security context :param expected_task_state: Optional tuple of valid task states for the instance to be in. :param expected_vm_state: Optional tuple of valid vm states for the instance to be in. :param admin_state_reset: True if admin API is forcing setting of task_state/vm_state. """ cell_type = cells_opts.get_cell_type() if cell_type == 'api' and self.cell_name: # NOTE(comstud): We need to stash a copy of ourselves # before any updates are applied. When we call the save # methods on nested objects, we will lose any changes to # them. But we need to make sure child cells can tell # what is changed. # # We also need to nuke any updates to vm_state and task_state # unless admin_state_reset is True. compute cells are # authoritative for their view of vm_state and task_state. stale_instance = self.obj_clone() def _handle_cell_update_from_api(): cells_api = cells_rpcapi.CellsAPI() cells_api.instance_update_from_api(context, stale_instance, expected_vm_state, expected_task_state, admin_state_reset) else: stale_instance = None updates = {} changes = self.obj_what_changed() for field in self.fields: if (self.obj_attr_is_set(field) and isinstance(self[field], base.NovaObject)): try: getattr(self, '_save_%s' % field)(context) except AttributeError: LOG.exception(_('No save handler for %s') % field, instance=self) elif field in changes: updates[field] = self[field] if not updates: if stale_instance: _handle_cell_update_from_api() return # Cleaned needs to be turned back into an int here if 'cleaned' in updates: if updates['cleaned']: updates['cleaned'] = 1 else: updates['cleaned'] = 0 if expected_task_state is not None: if (self.VERSION == '1.9' and expected_task_state == 'image_snapshot'): # NOTE(danms): Icehouse introduced a pending state which # Havana doesn't know about. If we're an old instance, # tolerate the pending state as well expected_task_state = [ expected_task_state, 'image_snapshot_pending'] updates['expected_task_state'] = expected_task_state if expected_vm_state is not None: updates['expected_vm_state'] = expected_vm_state expected_attrs = [attr for attr in _INSTANCE_OPTIONAL_JOINED_FIELDS if self.obj_attr_is_set(attr)] # NOTE(alaski): We need to pull system_metadata for the # notification.send_update() below. If we don't there's a KeyError # when it tries to extract the flavor. if 'system_metadata' not in expected_attrs: expected_attrs.append('system_metadata') old_ref, inst_ref = db.instance_update_and_get_original( context, self.uuid, updates, update_cells=False, columns_to_join=_expected_cols(expected_attrs)) if stale_instance: _handle_cell_update_from_api() elif cell_type == 'compute': cells_api = cells_rpcapi.CellsAPI() cells_api.instance_update_at_top(context, inst_ref) self._from_db_object(context, self, inst_ref, expected_attrs) notifications.send_update(context, old_ref, inst_ref) self.obj_reset_changes() @base.remotable
**** CubicPower OpenStack Study **** def refresh(self, context, use_slave=False): extra = [field for field in INSTANCE_OPTIONAL_ATTRS if self.obj_attr_is_set(field)] current = self.__class__.get_by_uuid(context, uuid=self.uuid, expected_attrs=extra, use_slave=use_slave) # NOTE(danms): We orphan the instance copy so we do not unexpectedly # trigger a lazy-load (which would mean we failed to calculate the # expected_attrs properly) current._context = None for field in self.fields: if self.obj_attr_is_set(field): if field == 'info_cache': self.info_cache.refresh() # NOTE(danms): Make sure this shows up as touched self.info_cache = self.info_cache elif self[field] != current[field]: self[field] = current[field] self.obj_reset_changes()
**** CubicPower OpenStack Study **** def obj_load_attr(self, attrname): if attrname not in INSTANCE_OPTIONAL_ATTRS: 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()) LOG.debug(_("Lazy-loading `%(attr)s' on %(name)s uuid %(uuid)s"), {'attr': attrname, 'name': self.obj_name(), 'uuid': self.uuid, }) # FIXME(comstud): This should be optimized to only load the attr. instance = self.__class__.get_by_uuid(self._context, uuid=self.uuid, expected_attrs=[attrname]) # NOTE(danms): Never allow us to recursively-load if instance.obj_attr_is_set(attrname): self[attrname] = instance[attrname] else: raise exception.ObjectActionError( action='obj_load_attr', reason='loading %s requires recursion' % attrname)
**** CubicPower OpenStack Study **** def get_flavor(self, namespace=None): prefix = ('%s_' % namespace) if namespace is not None else '' db_flavor = flavors.extract_flavor(self, prefix) flavor = flavor_obj.Flavor() for key in flavors.system_metadata_flavor_props: flavor[key] = db_flavor[key] return flavor
**** CubicPower OpenStack Study **** def set_flavor(self, flavor, namespace=None): prefix = ('%s_' % namespace) if namespace is not None else '' self.system_metadata = flavors.save_flavor_info( self.system_metadata, flavor, prefix) self.save()
**** CubicPower OpenStack Study **** def delete_flavor(self, namespace): self.system_metadata = flavors.delete_flavor_info( self.system_metadata, "%s_" % namespace) self.save() @base.remotable
**** CubicPower OpenStack Study **** def delete_metadata_key(self, context, key): """Optimized metadata delete method. This provides a more efficient way to delete a single metadata key, instead of just calling instance.save(). This should be called with the key still present in self.metadata, which it will update after completion. """ db.instance_metadata_delete(context, self.uuid, key) md_was_changed = 'metadata' in self.obj_what_changed() del self.metadata[key] self._orig_metadata.pop(key, None) instance_dict = base.obj_to_primitive(self) notifications.send_update(context, instance_dict, instance_dict) if not md_was_changed: self.obj_reset_changes(['metadata']) def _make_instance_list(context, inst_list, db_inst_list, expected_attrs): get_fault = expected_attrs and 'fault' in expected_attrs inst_faults = {} if get_fault: # Build an instance_uuid:latest-fault mapping expected_attrs.remove('fault') instance_uuids = [inst['uuid'] for inst in db_inst_list] faults = instance_fault.InstanceFaultList.get_by_instance_uuids( context, instance_uuids) for fault in faults: if fault.instance_uuid not in inst_faults: inst_faults[fault.instance_uuid] = fault inst_list.objects = [] for db_inst in db_inst_list: inst_obj = Instance._from_db_object(context, Instance(), db_inst, expected_attrs=expected_attrs) if get_fault: inst_obj.fault = inst_faults.get(inst_obj.uuid, None) inst_list.objects.append(inst_obj) inst_list.obj_reset_changes() return inst_list
**** CubicPower OpenStack Study **** def _make_instance_list(context, inst_list, db_inst_list, expected_attrs): get_fault = expected_attrs and 'fault' in expected_attrs inst_faults = {} if get_fault: # Build an instance_uuid:latest-fault mapping expected_attrs.remove('fault') instance_uuids = [inst['uuid'] for inst in db_inst_list] faults = instance_fault.InstanceFaultList.get_by_instance_uuids( context, instance_uuids) for fault in faults: if fault.instance_uuid not in inst_faults: inst_faults[fault.instance_uuid] = fault inst_list.objects = [] for db_inst in db_inst_list: inst_obj = Instance._from_db_object(context, Instance(), db_inst, expected_attrs=expected_attrs) if get_fault: inst_obj.fault = inst_faults.get(inst_obj.uuid, None) inst_list.objects.append(inst_obj) inst_list.obj_reset_changes() return inst_list
**** CubicPower OpenStack Study **** class InstanceList(base.ObjectListBase, base.NovaObject): # Version 1.0: Initial version # Version 1.1: Added use_slave to get_by_host # Instance <= version 1.9 # Version 1.2: Instance <= version 1.11 # Version 1.3: Added use_slave to get_by_filters # Version 1.4: Instance <= version 1.12 # Version 1.5: Added method get_active_by_window_joined. # Version 1.6: Instance <= version 1.13 VERSION = '1.6' fields = { 'objects': fields.ListOfObjectsField('Instance'), } child_versions = { '1.1': '1.9', # NOTE(danms): Instance was at 1.9 before we added this '1.2': '1.11', '1.3': '1.11', '1.4': '1.12', '1.5': '1.12', '1.6': '1.13', } @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_filters(cls, context, filters, sort_key='created_at', sort_dir='desc', limit=None, marker=None, expected_attrs=None, use_slave=False): db_inst_list = db.instance_get_all_by_filters( context, filters, sort_key, sort_dir, limit=limit, marker=marker, columns_to_join=_expected_cols(expected_attrs), use_slave=use_slave) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_host(cls, context, host, expected_attrs=None, use_slave=False): db_inst_list = db.instance_get_all_by_host( context, host, columns_to_join=_expected_cols(expected_attrs), use_slave=use_slave) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_host_and_node(cls, context, host, node, expected_attrs=None): db_inst_list = db.instance_get_all_by_host_and_node( context, host, node) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_host_and_not_type(cls, context, host, type_id=None, expected_attrs=None): db_inst_list = db.instance_get_all_by_host_and_not_type( context, host, type_id=type_id) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_hung_in_rebooting(cls, context, reboot_window, expected_attrs=None): db_inst_list = db.instance_get_all_hung_in_rebooting(context, reboot_window) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def _get_active_by_window_joined(cls, context, begin, end=None, project_id=None, host=None, expected_attrs=None): # NOTE(mriedem): We need to convert the begin/end timestamp strings # to timezone-aware datetime objects for the DB API call. begin = timeutils.parse_isotime(begin) end = timeutils.parse_isotime(end) if end else None db_inst_list = db.instance_get_active_by_window_joined(context, begin, end, project_id, host) return _make_instance_list(context, cls(), db_inst_list, expected_attrs) @classmethod
**** CubicPower OpenStack Study **** def get_active_by_window_joined(cls, context, begin, end=None, project_id=None, host=None, expected_attrs=None): """Get instances and joins active during a certain time window. :param context: nova request context :param begin: datetime for the start of the time window :param end: datetime for the end of the time window :param project_id: used to filter instances by project :param host: used to filter instances on a given compute host :param expected_attrs: list of related fields that can be joined in the database layer when querying for instances :returns: InstanceList """ # NOTE(mriedem): We have to convert the datetime objects to string # primitives for the remote call. begin = timeutils.isotime(begin) end = timeutils.isotime(end) if end else None return cls._get_active_by_window_joined(context, begin, end, project_id, host, expected_attrs) @base.remotable_classmethod
**** CubicPower OpenStack Study **** def get_by_security_group_id(cls, context, security_group_id): db_secgroup = db.security_group_get( context, security_group_id, columns_to_join=['instances.info_cache', 'instances.system_metadata']) return _make_instance_list(context, cls(), db_secgroup['instances'], ['info_cache', 'system_metadata']) @classmethod
**** CubicPower OpenStack Study **** def get_by_security_group(cls, context, security_group): return cls.get_by_security_group_id(context, security_group.id)
**** CubicPower OpenStack Study **** def fill_faults(self): """Batch query the database for our instances' faults. :returns: A list of instance uuids for which faults were found. """ uuids = [inst.uuid for inst in self] faults = instance_fault.InstanceFaultList.get_by_instance_uuids( self._context, uuids) faults_by_uuid = {} for fault in faults: if fault.instance_uuid not in faults_by_uuid: faults_by_uuid[fault.instance_uuid] = fault for instance in self: if instance.uuid in faults_by_uuid: instance.fault = faults_by_uuid[instance.uuid] else: # NOTE(danms): Otherwise the caller will cause a lazy-load # when checking it, and we know there are none instance.fault = None instance.obj_reset_changes(['fault']) return faults_by_uuid.keys()
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