Ignore NotFound error in prepare_for_replace

If the port is already deleted in neutron, we don't need to do
anything.

Change-Id: I9275610931a174919076330ec443f54f68cc1371
Story: #2003015
Task: 23035
(cherry picked from commit 3d542935fbe7def5e785c26a1b6a8b468cfeaa48)

2 files changed, 26 insertions, 5 deletions

diff --git a/heat/engine/resources/openstack/neutron/port.py b/heat/engine/resources/openstack/neutron/port.py
index 4ca10292c..6e12a1a8f 100644
--- a/heat/engine/resources/openstack/neutron/port.py
+++ b/heat/engine/resources/openstack/neutron/port.py
@@ -529,11 +529,13 @@ class Port(neutron.NeutronResource):
         if self.resource_id is None:
             return
         # store port fixed_ips for restoring after failed update
-        fixed_ips = self._show_resource().get('fixed_ips', [])
-        self.data_set('port_fip', jsonutils.dumps(fixed_ips))
-        # reset fixed_ips for this port by setting fixed_ips to []
-        props = {'fixed_ips': []}
-        self.client().update_port(self.resource_id, {'port': props})
+        # Ignore if the port does not exist in neutron (deleted)
+        with self.client_plugin().ignore_not_found:
+            fixed_ips = self._show_resource().get('fixed_ips', [])
+            self.data_set('port_fip', jsonutils.dumps(fixed_ips))
+            # reset fixed_ips for this port by setting fixed_ips to []
+            props = {'fixed_ips': []}
+            self.client().update_port(self.resource_id, {'port': props})
 
     def restore_prev_rsrc(self, convergence=False):
         # In case of convergence, during rollback, the previous rsrc is
diff --git a/heat/tests/openstack/neutron/test_neutron_port.py b/heat/tests/openstack/neutron/test_neutron_port.py
index d0b3a1fea..1410ecfba 100644
--- a/heat/tests/openstack/neutron/test_neutron_port.py
+++ b/heat/tests/openstack/neutron/test_neutron_port.py
@@ -605,6 +605,25 @@ class NeutronPortTest(common.HeatTestCase):
         self.assertFalse(port.data_set.called)
         self.assertFalse(n_client.update_port.called)
 
+    def test_prepare_for_replace_port_not_found(self):
+        t = template_format.parse(neutron_port_template)
+        stack = utils.parse_stack(t)
+        port = stack['port']
+        port.resource_id = 'test_res_id'
+        port._show_resource = mock.Mock(side_effect=qe.NotFound)
+        port.data_set = mock.Mock()
+        n_client = mock.Mock()
+        port.client = mock.Mock(return_value=n_client)
+
+        # execute prepare_for_replace
+        port.prepare_for_replace()
+
+        # check, if the port is not found, do nothing in
+        # prepare_for_replace()
+        self.assertTrue(port._show_resource.called)
+        self.assertFalse(port.data_set.called)
+        self.assertFalse(n_client.update_port.called)
+
     def test_prepare_for_replace_port(self):
         t = template_format.parse(neutron_port_template)
         stack = utils.parse_stack(t)