def __init__(self, relations, options=None, options_instance=None,
charm_instance=None):
"""
:param relations: List of instances of relation classes
:param options: Configuration class to use (DEPRECATED)
:param options_instance: Instance of Configuration class to use
:param charm_instance: optional charm_instance that is captured as a
weakref for use on the adapter.
"""
self._charm_instance_weakref = None
if charm_instance is not None:
self._charm_instance_weakref = weakref.ref(charm_instance)
self._relations = set()
if options is not None:
hookenv.log("The 'options' argument is deprecated please use "
"options_instance instead.", level=hookenv.WARNING)
self.options = options()
elif options_instance is not None:
self.options = options_instance
else:
# create a default, customised ConfigurationAdapter if the
# APIConfigurationAdapter is needed as a base, then it must be
# passed as an instance on the options_instance First pull the
# configuration class from the charm instance (if it's available).
base_cls = None
if self.charm_instance:
base_cls = getattr(self.charm_instance, 'configuration_class',
base_cls)
self.options = make_default_options(base_cls, self.charm_instance)
self._relations.add('options')
# walk the mro() from object to this class to build up the _adapters
# ensure that all of the relations' have their '-' turned into a '_' to
# ensure that everything is consistent in the class.
self._adapters = {}
for cls in reversed(self.__class__.mro()):
self._adapters.update(
{k.replace('-', '_'): v
for k, v in getattr(cls, 'relation_adapters', {}).items()})
# now we have to add in any customisations to those adapters
for relation, properties in _custom_adapter_properties.items():
relation = relation.replace('-', '_')
try:
cls = self._adapters[relation]
except KeyError:
cls = OpenStackRelationAdapter
self._adapters[relation] = make_default_relation_adapter(
cls, relation, properties)
self.add_relations(relations)
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