| |
| # 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, VSGService, VSGServiceInstance, 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.creator = si.creator |
| 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() |