Delete share network subnet during network deletion

Share network subnet is deleted during share network deletion which was
missing earlier causing lots of stale db entries.

Change-Id: Idb58b4ca389cfb1aaf8f9f1f8aa2fd15979c4872
Closes-bug: #2037422

manila/db/sqlalchemy/api.py

@@ -4679,6 +4679,8 @@ def share_network_create(context, values):
 @context_manager.writer
 def share_network_delete(context, id):
     network_ref = _share_network_get(context, id)
+    for subnet in network_ref['share_network_subnets']:
+        share_network_subnet_delete(context, subnet['id'])
     network_ref.soft_delete(session=context.session)
 
 

manila/tests/db/sqlalchemy/test_api.py

@@ -2738,6 +2738,24 @@ class ShareNetworkDatabaseAPITestCase(BaseDatabaseAPITestCase):
                           self.fake_context,
                           self.share_nw_dict['id'])
 
+    @ddt.data([{'id': 'fake_id_1', 'availability_zone_id': 'None'}],
+              [{'id': 'fake_id_2', 'availability_zone_id': 'None'},
+               {'id': 'fake_id_3', 'availability_zone_id': 'fake_az_id'}])
+    def test_delete_with_subnets(self, subnets):
+        db_api.share_network_create(self.fake_context, self.share_nw_dict)
+
+        for subnet in subnets:
+            subnet['share_network_id'] = self.share_nw_dict['id']
+            db_api.share_network_subnet_create(self.fake_context, subnet)
+
+        db_api.share_network_delete(self.fake_context,
+                                    self.share_nw_dict['id'])
+
+        self.assertRaises(exception.ShareNetworkSubnetNotFound,
+                          db_api.share_network_subnet_get,
+                          self.fake_context,
+                          subnets[0]['id'])
+
     def test_delete_not_found(self):
         self.assertRaises(exception.ShareNetworkNotFound,
                           db_api.share_network_delete,

releasenotes/notes/bug-2037422-delete-share-network-subnet-on-network-deletion-b28b42ce4a42b554.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Now, default share network subnet is deleted when share network is deleted,
+    in case it is the only subnet present in share network. Please refer to the
+    `Launchpad bug #2037422 <https://bugs.launchpad.net/manila/+bug/2037422>`_
+    for more details.