def _set_specs_for_instance(self, context, instance_db, spec_id_list):
if not spec_id_list:
instance_db.spec_ids = []
return
with context.session.begin(subtransactions=True):
filters = {'id': spec_id_list}
specs_in_db = self._get_collection_query(context, ServiceChainSpec,
filters=filters)
specs_list = set(spec_db['id'] for spec_db in specs_in_db)
for spec_id in spec_id_list:
if spec_id not in specs_list:
# Do not update if spec ID is invalid
raise schain.ServiceChainSpecNotFound(sc_spec_id=spec_id)
# Reset the existing list and then add each spec in order. The list
# could be empty in which case we clear the existing specs.
instance_db.specs = []
for spec_id in spec_id_list:
assoc = InstanceSpecAssociation(
servicechain_instance_id=instance_db.id,
servicechain_spec_id=spec_id)
instance_db.specs.append(assoc)
def _get_servicechain_spec(self, context, spec_id):
try:
return self._get_by_id(context, ServiceChainSpec, spec_id)
except exc.NoResultFound:
raise schain.ServiceChainSpecNotFound(sc_spec_id=spec_id)