def update_flow_classifier(self, chain_id, fc, auth_attr=None):
if not auth_attr:
LOG.warning("auth information required for n-sfc driver")
return None
fc_id = fc.pop('instance_id')
fc_status = fc.pop('status')
match_dict = fc.pop('match')
fc.update(match_dict)
sfc_classifier_params = self._create_classifier_params(fc)
neutronclient_ = NeutronClient(auth_attr)
if fc_status == constants.PENDING_UPDATE:
fc_info = neutronclient_.flow_classifier_show(fc_id)
for field in sfc_classifier_params:
# If the new classifier is the same with the old one then
# no change needed.
if (fc_info['flow_classifier'].get(field) is not None) and \
(sfc_classifier_params[field] == fc_info[
'flow_classifier'][field]):
continue
# If the new classifier has different match criteria
# with the old one then we strip the classifier from
# the chain we delete the old classifier and we create
# a new one with the same name as before but with different
# match criteria. We are not using the flow_classifier_update
# from the n-sfc because it does not support match criteria
# update for an existing classifier yet.
else:
try:
self._dissociate_classifier_from_chain(chain_id,
[fc_id],
neutronclient_)
except Exception as e:
raise e
fc_id = neutronclient_.flow_classifier_create(
sfc_classifier_params)
if fc_id is None:
raise nfvo.UpdateClassifierException(
message="Failed to update classifiers")
break
# If the new classifier is completely different from the existing
# ones (name and match criteria) then we just create it.
else:
fc_id = neutronclient_.flow_classifier_create(
sfc_classifier_params)
if fc_id is None:
raise nfvo.UpdateClassifierException(
message="Failed to update classifiers")
return fc_id
def _dissociate_classifier_from_chain(self, chain_id, fc_ids,
neutronclient):
pc_info = neutronclient.port_chain_show(chain_id)
current_fc_list = pc_info['port_chain']['flow_classifiers']
for fc_id in fc_ids:
current_fc_list.remove(fc_id)
pc_id = neutronclient.port_chain_update(
chain_id, {'flow_classifiers': current_fc_list})
if pc_id is None:
raise nfvo.UpdateClassifierException(
message="Failed to update classifiers")
for fc_id in fc_ids:
try:
neutronclient.flow_classifier_delete(fc_id)
except ValueError as e:
raise e
