# # 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. import base64 import contextlib from datetime import datetime from oslo.config import cfg import six import warnings from heat.common import exception from heat.common import identifier from heat.common import short_id from heat.common import timeutils from heat.db import api as db_api from heat.engine import attributes from heat.engine import environment from heat.engine import event from heat.engine import function from heat.engine.properties import Properties from heat.engine import resources from heat.engine import rsrc_defn from heat.engine import scheduler from heat.engine import support from heat.openstack.common import excutils from heat.openstack.common.gettextutils import _ from heat.openstack.common import log as logging cfg.CONF.import_opt('action_retry_limit', 'heat.common.config') LOG = logging.getLogger(__name__) def get_types(support_status): '''Return a list of valid resource types.''' return resources.global_env().get_types(support_status) def get_class(resource_type, resource_name=None): '''Return the Resource class for a given resource type.''' return resources.global_env().get_class(resource_type, resource_name) def _register_class(resource_type, resource_class): resources.global_env().register_class(resource_type, resource_class) class UpdateReplace(Exception): '''Raised when resource update requires replacement.''' def __init__(self, resource_name='Unknown'): msg = _("The Resource %s requires replacement.") % resource_name super(Exception, self).__init__(six.text_type(msg)) class ResourceInError(exception.HeatException): msg_fmt = _('Went to status %(resource_status)s ' 'due to "%(status_reason)s"') def __init__(self, status_reason=_('Unknown'), **kwargs): super(ResourceInError, self).__init__(status_reason=status_reason, **kwargs) class ResourceUnknownStatus(exception.HeatException): msg_fmt = _('Unknown status %(resource_status)s') class Resource(object): ACTIONS = (INIT, CREATE, DELETE, UPDATE, ROLLBACK, SUSPEND, RESUME, ADOPT ) = ('INIT', 'CREATE', 'DELETE', 'UPDATE', 'ROLLBACK', 'SUSPEND', 'RESUME', 'ADOPT') STATUSES = (IN_PROGRESS, FAILED, COMPLETE ) = ('IN_PROGRESS', 'FAILED', 'COMPLETE') # If True, this resource must be created before it can be referenced. strict_dependency = True # Resource implementation set this to the subset of resource properties # supported for handle_update, used by update_template_diff_properties update_allowed_properties = () # Resource implementations set this to the name: description dictionary # that describes the appropriate resource attributes attributes_schema = {} # If True, this resource may perform authenticated API requests # throughout its lifecycle requires_deferred_auth = False # Limit to apply to physical_resource_name() size reduction algorithm. # If set to None no limit will be applied. physical_resource_name_limit = 255 support_status = support.SupportStatus() # Default name to use for calls to self.client() default_client_name = None def __new__(cls, name, definition, stack): '''Create a new Resource of the appropriate class for its type.''' assert isinstance(definition, rsrc_defn.ResourceDefinition) if cls != Resource: # Call is already for a subclass, so pass it through ResourceClass = cls else: from heat.engine.resources import template_resource # Select the correct subclass to instantiate. # Note: If the current stack is an implementation of # a resource type (a TemplateResource mapped in the environment) # then don't infinitely recurse by creating a child stack # of the same type. Instead get the next match which will get # us closer to a concrete class. def get_ancestor_template_resources(): """Return an ancestry list (TemplateResources only).""" parent = stack.parent_resource while parent is not None: if isinstance(parent, template_resource.TemplateResource): yield parent.template_name parent = parent.stack.parent_resource ancestor_list = set(get_ancestor_template_resources()) def accept_class(res_info): if not isinstance(res_info, environment.TemplateResourceInfo): return True return res_info.template_name not in ancestor_list registry = stack.env.registry ResourceClass = registry.get_class(definition.resource_type, resource_name=name, accept_fn=accept_class) assert issubclass(ResourceClass, Resource) return super(Resource, cls).__new__(ResourceClass) def __init__(self, name, definition, stack): if '/' in name: raise ValueError(_('Resource name may not contain "/"')) self.stack = stack self.context = stack.context self.name = name self.t = definition self.reparse() self.attributes = attributes.Attributes(self.name, self.attributes_schema, self._resolve_attribute) self.abandon_in_progress = False self.resource_id = None # if the stack is being deleted, assume we've already been deleted if stack.action == stack.DELETE: self.action = self.DELETE else: self.action = self.INIT self.status = self.COMPLETE self.status_reason = '' self.id = None self._data = {} self._rsrc_metadata = None self.created_time = None self.updated_time = None resource = stack.db_resource_get(name) if resource: self._load_data(resource) def _load_data(self, resource): '''Load the resource state from its DB representation.''' self.resource_id = resource.nova_instance self.action = resource.action self.status = resource.status self.status_reason = resource.status_reason self.id = resource.id try: self._data = db_api.resource_data_get_all(self, resource.data) except exception.NotFound: self._data = {} self._rsrc_metadata = resource.rsrc_metadata self.created_time = resource.created_at self.updated_time = resource.updated_at def reparse(self): self.properties = self.t.properties(self.properties_schema, self.context) def __eq__(self, other): '''Allow == comparison of two resources.''' # For the purposes of comparison, we declare two resource objects # equal if their names and parsed_templates are the same if isinstance(other, Resource): return (self.name == other.name) and ( self.parsed_template() == other.parsed_template()) return NotImplemented def __ne__(self, other): '''Allow != comparison of two resources.''' result = self.__eq__(other) if result is NotImplemented: return result return not result @property def metadata(self): """DEPRECATED. use method metadata_get instead.""" warnings.warn('metadata attribute is deprecated, ' 'use method metadata_get instead', DeprecationWarning) return self.metadata_get(True) @metadata.setter def metadata(self, metadata): """DEPRECATED. use method metadata_set instead.""" warnings.warn('metadata attribute is deprecated, ' 'use method metadata_set instead', DeprecationWarning) self.metadata_set(metadata) def metadata_get(self, refresh=False): if refresh: self._rsrc_metadata = None if self.id is None: return self.t.metadata() if self._rsrc_metadata is not None: return self._rsrc_metadata rs = db_api.resource_get(self.stack.context, self.id) rs.refresh(attrs=['rsrc_metadata']) self._rsrc_metadata = rs.rsrc_metadata return rs.rsrc_metadata def metadata_set(self, metadata): if self.id is None: raise exception.ResourceNotAvailable(resource_name=self.name) rs = db_api.resource_get(self.stack.context, self.id) rs.update_and_save({'rsrc_metadata': metadata}) self._rsrc_metadata = metadata def type(self): return self.t.resource_type def has_interface(self, resource_type): """Check to see if this resource is either mapped to resource_type or is a "resource_type". """ if self.type() == resource_type: return True ri = self.stack.env.get_resource_info(self.type(), self.name) return ri.name == resource_type def implementation_signature(self): ''' Return a tuple defining the implementation. This should be broken down into a definition and an implementation version. ''' return (self.__class__.__name__, self.support_status.version) def identifier(self): '''Return an identifier for this resource.''' return identifier.ResourceIdentifier(resource_name=self.name, **self.stack.identifier()) def parsed_template(self, section=None, default=None): ''' Return the parsed template data for the resource. May be limited to only one section of the data, in which case a default value may also be supplied. ''' default = default or {} if section is None: template = self.t else: template = self.t.get(section, default) return function.resolve(template) def update_template_diff(self, after, before): ''' Returns the difference between the before and after json snippets. If something has been removed in after which exists in before we set it to None. ''' # Create a set containing the keys in both current and update template template_keys = set(before.keys()) template_keys.update(set(after.keys())) # Create a set of keys which differ (or are missing/added) changed_keys_set = set([k for k in template_keys if before.get(k) != after.get(k)]) return dict((k, after.get(k)) for k in changed_keys_set) def update_template_diff_properties(self, after_props, before_props): ''' Returns the changed Properties between the before and after properties. If any properties have changed which are not in update_allowed_properties, raises UpdateReplace. ''' update_allowed_set = set(self.update_allowed_properties) for (psk, psv) in six.iteritems(self.properties.props): if psv.update_allowed(): update_allowed_set.add(psk) # Create a set of keys which differ (or are missing/added) changed_properties_set = set(k for k in after_props if before_props.get(k) != after_props.get(k)) if not changed_properties_set.issubset(update_allowed_set): raise UpdateReplace(self.name) return dict((k, after_props.get(k)) for k in changed_properties_set) def __str__(self): if self.stack.id: if self.resource_id: return '%s "%s" [%s] %s' % (self.__class__.__name__, self.name, self.resource_id, str(self.stack)) return '%s "%s" %s' % (self.__class__.__name__, self.name, str(self.stack)) return '%s "%s"' % (self.__class__.__name__, self.name) def add_dependencies(self, deps): for dep in self.t.dependencies(self.stack): deps += (self, dep) deps += (self, None) def required_by(self): ''' Returns a list of names of resources which directly require this resource as a dependency. ''' return list( [r.name for r in self.stack.dependencies.required_by(self)]) def client(self, name=None): client_name = name or self.default_client_name assert client_name, "Must specify client name" return self.stack.clients.client(client_name) def client_plugin(self, name=None): client_name = name or self.default_client_name assert client_name, "Must specify client name" return self.stack.clients.client_plugin(client_name) def keystone(self): return self.client('keystone') def nova(self): return self.client('nova') def swift(self): return self.client('swift') def neutron(self): return self.client('neutron') def cinder(self): return self.client('cinder') def trove(self): return self.client('trove') def ceilometer(self): return self.client('ceilometer') def heat(self): return self.client('heat') def glance(self): return self.client('glance') @contextlib.contextmanager def _action_recorder(self, action, expected_exceptions=tuple()): '''Return a context manager to record the progress of an action. Upon entering the context manager, the state is set to IN_PROGRESS. Upon exiting, the state will be set to COMPLETE if no exception was raised, or FAILED otherwise. Non-exit exceptions will be translated to ResourceFailure exceptions. Expected exceptions are re-raised, with the Resource left in the IN_PROGRESS state. ''' try: self.state_set(action, self.IN_PROGRESS) yield except expected_exceptions as ex: with excutils.save_and_reraise_exception(): LOG.debug('%s', six.text_type(ex)) except Exception as ex: LOG.exception('%s: %s' % (action, str(self))) # noqa failure = exception.ResourceFailure(ex, self, action) self.state_set(action, self.FAILED, six.text_type(failure)) raise failure except: # noqa with excutils.save_and_reraise_exception(): try: self.state_set(action, self.FAILED, '%s aborted' % action) except Exception: LOG.exception(_('Error marking resource as failed')) else: self.state_set(action, self.COMPLETE) def _do_action(self, action, pre_func=None, resource_data=None): ''' Perform a transition to a new state via a specified action action should be e.g self.CREATE, self.UPDATE etc, we set status based on this, the transition is handled by calling the corresponding handle_* and check_*_complete functions Note pre_func is an optional function reference which will be called before the handle_ function If the resource does not declare a check_$action_complete function, we declare COMPLETE status as soon as the handle_$action call has finished, and if no handle_$action function is declared, then we do nothing, useful e.g if the resource requires no action for a given state transition ''' assert action in self.ACTIONS, 'Invalid action %s' % action with self._action_recorder(action): action_l = action.lower() handle = getattr(self, 'handle_%s' % action_l, None) check = getattr(self, 'check_%s_complete' % action_l, None) if callable(pre_func): pre_func() handle_data = None if callable(handle): handle_data = (handle(resource_data) if resource_data else handle()) yield if callable(check): while not check(handle_data): yield def preview(self): ''' Default implementation of Resource.preview. This method should be overridden by child classes for specific behavior. ''' return self @scheduler.wrappertask def create(self): ''' Create the resource. Subclasses should provide a handle_create() method to customise creation. ''' action = self.CREATE if (self.action, self.status) != (self.INIT, self.COMPLETE): exc = exception.Error(_('State %s invalid for create') % str(self.state)) raise exception.ResourceFailure(exc, self, action) LOG.info(_('creating %s') % str(self)) # Re-resolve the template, since if the resource Ref's # the StackId pseudo parameter, it will change after # the parser.Stack is stored (which is after the resources # are __init__'d, but before they are create()'d) self.reparse() def pause(): try: while True: yield except scheduler.Timeout: return count = {self.CREATE: 0, self.DELETE: 0} retry_limit = max(cfg.CONF.action_retry_limit, 0) first_failure = None while (count[self.CREATE] <= retry_limit and count[self.DELETE] <= retry_limit): if count[action]: delay = timeutils.retry_backoff_delay(count[action], jitter_max=2.0) waiter = scheduler.TaskRunner(pause) waiter.start(timeout=delay) while not waiter.step(): yield try: yield self._do_action(action, self.properties.validate) if action == self.CREATE: return else: action = self.CREATE except exception.ResourceFailure as failure: if not isinstance(failure.exc, ResourceInError): raise failure count[action] += 1 if action == self.CREATE: action = self.DELETE count[action] = 0 if first_failure is None: # Save the first exception first_failure = failure if first_failure: raise first_failure def prepare_abandon(self): self.abandon_in_progress = True return { 'name': self.name, 'resource_id': self.resource_id, 'type': self.type(), 'action': self.action, 'status': self.status, 'metadata': self.metadata_get(refresh=True), 'resource_data': self.data() } def adopt(self, resource_data): ''' Adopt the existing resource. Resource subclasses can provide a handle_adopt() method to customise adopt. ''' return self._do_action(self.ADOPT, resource_data=resource_data) def handle_adopt(self, resource_data=None): resource_id, data, metadata = self._get_resource_info(resource_data) if not resource_id: exc = Exception(_('Resource ID was not provided.')) failure = exception.ResourceFailure(exc, self) raise failure # set resource id self.resource_id_set(resource_id) # save the resource data if data and isinstance(data, dict): for key, value in six.iteritems(data): self.data_set(key, value) # save the resource metadata self.metadata_set(metadata) def _get_resource_info(self, resource_data): if not resource_data: return None, None, None return (resource_data.get('resource_id'), resource_data.get('resource_data'), resource_data.get('metadata')) def update(self, after, before=None, prev_resource=None): ''' update the resource. Subclasses should provide a handle_update() method to customise update, the base-class handle_update will fail by default. ''' action = self.UPDATE assert isinstance(after, rsrc_defn.ResourceDefinition) (cur_class_def, cur_ver) = self.implementation_signature() prev_ver = cur_ver if prev_resource is not None: (prev_class_def, prev_ver) = prev_resource.implementation_signature() if prev_class_def != cur_class_def: raise UpdateReplace(self.name) if before is None: before = self.parsed_template() if prev_ver == cur_ver and before == after: return if (self.action, self.status) in ((self.CREATE, self.IN_PROGRESS), (self.UPDATE, self.IN_PROGRESS), (self.ADOPT, self.IN_PROGRESS)): exc = Exception(_('Resource update already requested')) raise exception.ResourceFailure(exc, self, action) LOG.info(_('updating %s') % str(self)) self.updated_time = datetime.utcnow() with self._action_recorder(action, UpdateReplace): before_properties = Properties(self.properties_schema, before.get('Properties', {}), function.resolve, self.name, self.context) after_properties = after.properties(self.properties_schema, self.context) after_properties.validate() tmpl_diff = self.update_template_diff(function.resolve(after), before) prop_diff = self.update_template_diff_properties(after_properties, before_properties) if callable(getattr(self, 'handle_update', None)): handle_data = self.handle_update(after, tmpl_diff, prop_diff) yield if callable(getattr(self, 'check_update_complete', None)): while not self.check_update_complete(handle_data): yield self.t = after self.reparse() def suspend(self): ''' Suspend the resource. Subclasses should provide a handle_suspend() method to implement suspend ''' action = self.SUSPEND # Don't try to suspend the resource unless it's in a stable state if (self.action == self.DELETE or self.status != self.COMPLETE): exc = exception.Error(_('State %s invalid for suspend') % str(self.state)) raise exception.ResourceFailure(exc, self, action) LOG.info(_('suspending %s') % str(self)) return self._do_action(action) def resume(self): ''' Resume the resource. Subclasses should provide a handle_resume() method to implement resume ''' action = self.RESUME # Can't resume a resource unless it's SUSPEND_COMPLETE if self.state != (self.SUSPEND, self.COMPLETE): exc = exception.Error(_('State %s invalid for resume') % str(self.state)) raise exception.ResourceFailure(exc, self, action) LOG.info(_('resuming %s') % str(self)) return self._do_action(action) def physical_resource_name(self): if self.id is None: return None name = '%s-%s-%s' % (self.stack.name, self.name, short_id.get_id(self.id)) if self.physical_resource_name_limit: name = self.reduce_physical_resource_name( name, self.physical_resource_name_limit) return name @staticmethod def reduce_physical_resource_name(name, limit): ''' Reduce length of physical resource name to a limit. The reduced name will consist of the following: * the first 2 characters of the name * a hyphen * the end of the name, truncated on the left to bring the name length within the limit :param name: The name to reduce the length of :param limit: The max length limit :returns: A name whose length is less than or equal to the limit ''' if len(name) <= limit: return name if limit < 4: raise ValueError(_('limit cannot be less than 4')) postfix_length = limit - 3 return name[0:2] + '-' + name[-postfix_length:] def validate(self): LOG.info(_('Validating %s') % str(self)) function.validate(self.t) self.validate_deletion_policy(self.t.deletion_policy()) return self.properties.validate() @classmethod def validate_deletion_policy(cls, policy): if policy not in rsrc_defn.ResourceDefinition.DELETION_POLICIES: msg = _('Invalid deletion policy "%s"') % policy raise exception.StackValidationFailed(message=msg) if policy == rsrc_defn.ResourceDefinition.SNAPSHOT: if not callable(getattr(cls, 'handle_snapshot_delete', None)): msg = _('"%s" deletion policy not supported') % policy raise exception.StackValidationFailed(message=msg) def delete(self): ''' Delete the resource. Subclasses should provide a handle_delete() method to customise deletion. ''' action = self.DELETE if (self.action, self.status) == (self.DELETE, self.COMPLETE): return # No need to delete if the resource has never been created if self.action == self.INIT: return initial_state = self.state LOG.info(_('deleting %s') % str(self)) with self._action_recorder(action): if self.abandon_in_progress: deletion_policy = self.t.RETAIN else: deletion_policy = self.t.deletion_policy() handle_data = None if deletion_policy == self.t.DELETE: if callable(getattr(self, 'handle_delete', None)): handle_data = self.handle_delete() yield elif deletion_policy == self.t.SNAPSHOT: if callable(getattr(self, 'handle_snapshot_delete', None)): handle_data = self.handle_snapshot_delete(initial_state) yield if (deletion_policy != self.t.RETAIN and callable(getattr(self, 'check_delete_complete', None))): while not self.check_delete_complete(handle_data): yield @scheduler.wrappertask def destroy(self): ''' Delete the resource and remove it from the database. ''' yield self.delete() if self.id is None: return try: db_api.resource_get(self.context, self.id).delete() except exception.NotFound: # Don't fail on delete if the db entry has # not been created yet. pass self.id = None def resource_id_set(self, inst): self.resource_id = inst if self.id is not None: try: rs = db_api.resource_get(self.context, self.id) rs.update_and_save({'nova_instance': self.resource_id}) except Exception as ex: LOG.warn(_('db error %s') % ex) def _store(self): '''Create the resource in the database.''' metadata = self.metadata_get() try: rs = {'action': self.action, 'status': self.status, 'status_reason': self.status_reason, 'stack_id': self.stack.id, 'nova_instance': self.resource_id, 'name': self.name, 'rsrc_metadata': metadata, 'stack_name': self.stack.name} new_rs = db_api.resource_create(self.context, rs) self.id = new_rs.id self.created_time = new_rs.created_at self._rsrc_metadata = metadata except Exception as ex: LOG.error(_('DB error %s') % ex) def _add_event(self, action, status, reason): '''Add a state change event to the database.''' ev = event.Event(self.context, self.stack, action, status, reason, self.resource_id, self.properties, self.name, self.type()) ev.store() def _store_or_update(self, action, status, reason): self.action = action self.status = status self.status_reason = reason if self.id is not None: try: rs = db_api.resource_get(self.context, self.id) rs.update_and_save({'action': self.action, 'status': self.status, 'status_reason': reason, 'stack_id': self.stack.id, 'updated_at': self.updated_time, 'nova_instance': self.resource_id}) except Exception as ex: LOG.error(_('DB error %s') % ex) # store resource in DB on transition to CREATE_IN_PROGRESS # all other transitions (other than to DELETE_COMPLETE) # should be handled by the update_and_save above.. elif (action, status) in [(self.CREATE, self.IN_PROGRESS), (self.ADOPT, self.IN_PROGRESS)]: self._store() def _resolve_attribute(self, name): """ Default implementation; should be overridden by resources that expose attributes :param name: The attribute to resolve :returns: the resource attribute named key """ # By default, no attributes resolve pass def state_reset(self): """ Reset state to (INIT, COMPLETE) """ self.action = self.INIT self.status = self.COMPLETE def state_set(self, action, status, reason="state changed"): if action not in self.ACTIONS: raise ValueError(_("Invalid action %s") % action) if status not in self.STATUSES: raise ValueError(_("Invalid status %s") % status) old_state = (self.action, self.status) new_state = (action, status) self._store_or_update(action, status, reason) if new_state != old_state: self._add_event(action, status, reason) self.stack.reset_resource_attributes() @property def state(self): '''Returns state, tuple of action, status.''' return (self.action, self.status) def FnGetRefId(self): ''' For the intrinsic function Ref. :results: the id or name of the resource. ''' if self.resource_id is not None: return unicode(self.resource_id) else: return unicode(self.name) def FnGetAtt(self, key, *path): ''' For the intrinsic function Fn::GetAtt. :param key: the attribute key. :param path: a list of path components to select from the attribute. :returns: the attribute value. ''' try: attribute = self.attributes[key] except KeyError: raise exception.InvalidTemplateAttribute(resource=self.name, key=key) else: return attributes.select_from_attribute(attribute, path) def FnBase64(self, data): ''' For the instrinsic function Fn::Base64. :param data: the input data. :returns: the Base64 representation of the input data. ''' return base64.b64encode(data) def signal(self, details=None): ''' signal the resource. Subclasses should provide a handle_signal() method to implement the signal, the base-class raise an exception if no handler is implemented. ''' def get_string_details(): if details is None: return 'No signal details provided' if isinstance(details, basestring): return details if isinstance(details, dict): if all(k in details for k in ('previous', 'current', 'reason')): # this is from Ceilometer. auto = '%(previous)s to %(current)s (%(reason)s)' % details return 'alarm state changed from %s' % auto elif 'state' in details: # this is from watchrule return 'alarm state changed to %(state)s' % details elif 'deploy_status_code' in details: # this is for SoftwareDeployment if details['deploy_status_code'] == 0: return 'deployment succeeded' else: return ('deployment failed ' '(%(deploy_status_code)s)' % details) return 'Unknown' try: if not callable(getattr(self, 'handle_signal', None)): msg = (_('Resource %s is not able to receive a signal') % str(self)) raise Exception(msg) signal_result = self.handle_signal(details) if signal_result: reason_string = "Signal: %s" % signal_result else: reason_string = get_string_details() self._add_event('signal', self.status, reason_string) except Exception as ex: LOG.exception(_('signal %(name)s : %(msg)s') % {'name': str(self), 'msg': ex}) failure = exception.ResourceFailure(ex, self) raise failure def handle_update(self, json_snippet=None, tmpl_diff=None, prop_diff=None): if prop_diff: raise UpdateReplace(self.name) def metadata_update(self, new_metadata=None): ''' No-op for resources which don't explicitly override this method ''' if new_metadata: LOG.warning(_("Resource %s does not implement metadata update") % self.name) @classmethod def resource_to_template(cls, resource_type): ''' :param resource_type: The resource type to be displayed in the template :returns: A template where the resource's properties_schema is mapped as parameters, and the resource's attributes_schema is mapped as outputs ''' (parameters, properties) = (Properties. schema_to_parameters_and_properties( cls.properties_schema)) resource_name = cls.__name__ return { 'HeatTemplateFormatVersion': '2012-12-12', 'Parameters': parameters, 'Resources': { resource_name: { 'Type': resource_type, 'Properties': properties } }, 'Outputs': attributes.Attributes.as_outputs(resource_name, cls) } def data(self): ''' Resource data for this resource Use methods data_set and data_delete to modify the resource data for this resource. :returns: a dict representing the resource data for this resource. ''' if self._data is None and self.id: try: self._data = db_api.resource_data_get_all(self) except exception.NotFound: pass return self._data or {} def data_set(self, key, value, redact=False): '''Save resource's key/value pair to database.''' db_api.resource_data_set(self, key, value, redact) # force fetch all resource data from the database again self._data = None def data_delete(self, key): ''' Remove a resource_data element associated to a resource. :returns: True if the key existed to delete ''' try: db_api.resource_data_delete(self, key) except exception.NotFound: return False else: # force fetch all resource data from the database again self._data = None return True