blob: 0756b45a2cc32d1c4cf66cc0ae19ce7326019e4c [file] [log] [blame]
# Copyright 2017-present Open Networking Foundation
#
# 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 synchronizers.new_base.modelaccessor import VOLTServiceInstance, ServiceInstanceLink, model_accessor
from synchronizers.new_base.policy import Policy
class VOLTServiceInstancePolicy(Policy):
model_name = "VOLTServiceInstance"
def handle_create(self, tenant):
return self.handle_update(tenant)
def handle_update(self, tenant):
if (tenant.link_deleted_count > 0) and (not tenant.provided_links.exists()):
# If this instance has no links pointing to it, delete
self.handle_delete(tenant)
if VOLTServiceInstance.objects.filter(id=tenant.id).exists():
tenant.delete()
return
self.manage_vsg(tenant)
self.cleanup_orphans(tenant)
def handle_delete(self, tenant):
pass
# assume this is handled by ServiceInstanceLink being deleted
#if tenant.vcpe:
# tenant.vcpe.delete()
def get_current_vsg(self, tenant):
for link in ServiceInstanceLink.objects.filter(subscriber_service_instance_id = tenant.id):
# NOTE: Assumes the first (and only?) link is to a vsg
# cast from ServiceInstance to VSGTenant
return link.provider_service_instance.leaf_model
return None
def create_eastbound_instance(self, si):
chain = si.subscribed_links.all()
# Already has a chain
if len(chain) > 0 and not si.is_new:
self.logger.debug("MODEL_POLICY: Subscriber %s is already part of a chain" % si.id)
return
# if it does not have a chain,
# Find links to the next element in the service chain
# and create one
links = si.owner.subscribed_dependencies.all()
for link in links:
si_class = link.provider_service.get_service_instance_class_name()
self.logger.info("MODEL_POLICY: VOLTServiceInstance %s creating %s" % (si, si_class))
eastbound_si_class = model_accessor.get_model_class(si_class)
eastbound_si = eastbound_si_class()
eastbound_si.owner_id = link.provider_service_id
eastbound_si.save()
link = ServiceInstanceLink(provider_service_instance=eastbound_si, subscriber_service_instance=si)
link.save()
def manage_vsg(self, tenant):
# Each VOLT object owns exactly one VCPE object
if tenant.deleted:
self.logger.info("MODEL_POLICY: VOLTServiceInstance %s deleted, deleting vsg" % tenant)
return
cur_vsg = self.get_current_vsg(tenant)
# Check to see if the wrong s-tag is set. This can only happen if the
# user changed the s-tag after the VOLTServiceInstance object was created.
if cur_vsg and cur_vsg.instance:
s_tags = Tag.objects.filter(content_type=cur_vsg.instance.self_content_type_id,
object_id=cur_vsg.instance.id, name="s_tag")
if s_tags and (s_tags[0].value != str(tenant.s_tag)):
self.logger.info("MODEL_POLICY: VOLTServiceInstance %s s_tag changed, deleting vsg" % tenant)
cur_vsg.delete()
cur_vsg = None
if cur_vsg is None:
self.create_eastbound_instance(tenant)
def cleanup_orphans(self, tenant):
# ensure vOLT only has one vCPE
cur_vsg = self.get_current_vsg(tenant)
links = tenant.subscribed_links.all()
for link in links:
if (link.provider_service_instance_id != cur_vsg.id):
link.delete()