Raise NotFound exception when get a deleted stack

Heat will always return a stack record if query with an id, so
if a stack is deleted, we can still get it from heat, it will
break wait_for_delete function.

Change-Id: I44367fd053201dd2a20dc14dd9067e29a3a7d2a6
Closes-Bug: #1528996

openstack/orchestration/v1/stack.py

@@ -108,6 +108,13 @@ class Stack(resource.Resource):
                     "No stack found for %s" % name_or_id)
         return stk
 
+    def get(self, session, include_headers=False, args=None):
+        stk = super(Stack, self).get(session, include_headers, args)
+        if stk and stk.status in ['DELETE_COMPLETE', 'ADOPT_COMPLETE']:
+            raise exceptions.NotFoundException(
+                "No stack found for %s" % stk.id)
+        return stk
+
 
 class StackPreview(Stack):
     base_path = '/stacks/preview'

openstack/tests/unit/orchestration/v1/test_stack.py

@@ -178,3 +178,22 @@ class TestStack(testtools.TestCase):
                                sess, 'fake_name', ignore_missing=False)
         self.assertEqual('ResourceNotFound: No stack found for fake_name',
                          six.text_type(ex))
+
+    @mock.patch.object(resource.Resource, 'get')
+    def test_get(self, mock_get):
+        sess = mock.Mock()
+        sot = stack.Stack(FAKE)
+        deleted_stack = mock.Mock(id=FAKE_ID, status='DELETE_COMPLETE')
+        normal_stack = mock.Mock(status='CREATE_COMPLETE')
+        mock_get.side_effect = [
+            normal_stack,
+            exceptions.NotFoundException(message='oops'),
+            deleted_stack,
+        ]
+
+        self.assertEqual(normal_stack, sot.get(sess))
+        ex = self.assertRaises(exceptions.NotFoundException, sot.get, sess)
+        self.assertEqual('NotFoundException: oops', six.text_type(ex))
+        ex = self.assertRaises(exceptions.NotFoundException, sot.get, sess)
+        self.assertEqual('NotFoundException: No stack found for %s' % FAKE_ID,
+                         six.text_type(ex))