Delete SNAT left vn

Handle delete of SNAT left vn from timer to event based.
Dereference the ports and instance ips before deleting the
snat left vn.

Also change api-server to ignore if iip does not have vn ref.

Change-Id: I88261271efe28db7c777c207c047bcd857e09f42
Closes-Bug: #1367097

src/config/api-server/vnc_cfg_types.py

@@ -473,6 +473,8 @@ def pre_dbe_update(cls, id, fq_name, obj_dict, db_conn,
             return ok, result
         db_iip_dict = result
 
+        if 'virtual_network_refs' not in db_iip_dict:
+            return True, ''
         vn_uuid = db_iip_dict['virtual_network_refs'][0]['uuid']
         vn_fq_name = db_iip_dict['virtual_network_refs'][0]['to']
         if ((vn_fq_name == cfgm_common.IP_FABRIC_VN_FQ_NAME) or

src/config/svc-monitor/svc_monitor/config_db.py

@@ -673,6 +673,7 @@ class VirtualNetworkSM(DBBaseSM):
     def __init__(self, uuid, obj_dict=None):
         self.uuid = uuid
         self.virtual_machine_interfaces = set()
+        self.instance_ips = set()
         obj_dict = self.update(obj_dict)
         self.add_to_parent(obj_dict)
     # end __init__
@@ -683,6 +684,7 @@ def update(self, obj=None):
         self.name = obj['fq_name'][-1]
         self.fq_name = obj['fq_name']
         self.update_multiple_refs('virtual_machine_interface', obj)
+        self.update_multiple_refs('instance_ip', obj)
         return obj
     # end update
 
@@ -692,6 +694,7 @@ def delete(cls, uuid):
             return
         obj = cls._dict[uuid]
         obj.update_multiple_refs('virtual_machine_interface', {})
+        obj.update_multiple_refs('instance_ip', {})
         obj.remove_from_parent()
         del cls._dict[uuid]
     # end delete
@@ -759,6 +762,7 @@ def __init__(self, uuid, obj_dict=None):
         self.secondary_tracking_ip = None
         self.service_health_check_ip = None
         self.virtual_machine_interfaces = set()
+        self.virtual_networks = set()
         self.update(obj_dict)
     # end __init__
 
@@ -775,6 +779,7 @@ def update(self, obj=None):
         self.family = obj.get('instance_ip_family', 'v4')
         self.address = obj.get('instance_ip_address', None)
         self.update_multiple_refs('virtual_machine_interface', obj)
+        self.update_multiple_refs('virtual_network', obj)
         self.update_single_ref('service_instance', obj)
     # end update
 
@@ -785,6 +790,7 @@ def delete(cls, uuid):
         obj = cls._dict[uuid]
         obj.update_single_ref('service_instance', {})
         obj.update_multiple_refs('virtual_machine_interface', {})
+        obj.update_multiple_refs('virtual_network', {})
         del cls._dict[uuid]
     # end delete
 

src/config/svc-monitor/svc_monitor/snat_agent.py

@@ -183,6 +183,37 @@ def _add_snat_instance(self, router_obj):
         self._vnc_lib.logical_router_update(vnc_rtr_obj)
     # end add_snat_instance
 
+    def delete_snat_vn(self, si_obj):
+        vn_name = '%s_%s' % (svc_info.get_snat_left_vn_prefix(),
+                             si_obj.name)
+        vn_fq_name = si_obj.fq_name[:-1] + [vn_name]
+        try:
+            vn_obj = self._vnc_lib.virtual_network_read(fq_name=vn_fq_name)
+        except NoIdError:
+            return
+
+        vn = VirtualNetworkSM.get(vn_obj.uuid)
+        if not vn:
+            return
+
+        for vmi_id in vn.virtual_machine_interfaces:
+            try:
+                self._vnc_lib.ref_update('virtual-machine-interface',
+                    vmi_id, 'virtual-network', vn.uuid, None, 'DELETE')
+            except NoIdError:
+                pass
+
+        for iip_id in vn.instance_ips:
+            try:
+                self._vnc_lib.instance_ip_delete(id=iip_id)
+            except NoIdError:
+                pass
+
+        try:
+            self._vnc_lib.virtual_network_delete(id=vn.uuid)
+        except (RefsExistError, NoIdError):
+            pass
+
     def delete_snat_instance(self, router_obj):
         try:
             vnc_rtr_obj = self._vnc_lib.logical_router_read(id=router_obj.uuid)
@@ -219,16 +250,11 @@ def delete_snat_instance(self, router_obj):
         if not si_obj:
             return
 
-        self._vnc_lib.service_instance_delete(id=si_uuid)
-
         # Delete left network
-        vn_name = '%s_%s' % (svc_info.get_snat_left_vn_prefix(),
-                             si_obj.name)
-        vn_fq_name = si_obj.fq_name[:-1] + [vn_name]
-        try:
-            self._vnc_lib.virtual_network_delete(fq_name=vn_fq_name)
-        except (RefsExistError, NoIdError):
-            pass
+        self.delete_snat_vn(si_obj)
+
+        # Delete service instance
+        self._vnc_lib.service_instance_delete(id=si_uuid)
     # end delete_snat_instance
 
     def cleanup_snat_instance(self, lr_id, si_id):