Fix an error when generating a host ID

When instance action events are created by periodic tasks,
the project IDs of them become null (None).
It causes an error when 'hostId' is generated
in the "Show Server Action Details"
(GET /servers/{server_id}/os-instance-actions/{request_id})
API.

Fix the issue by using the project ID of the server
if the project ID of the event is None.

Change-Id: Iac07fcddd4cc3321c6efe702066eb8af6a875418
Closes-Bug: #1817542

nova/api/openstack/compute/instance_actions.py

@@ -175,8 +175,15 @@ class InstanceActionsController(wsgi.Controller):
         if show_events:
             events_raw = self.action_api.action_events_get(context, instance,
                                                            action_id)
+            # NOTE(takashin): The project IDs of instance action events
+            # become null (None) when instance action events are created
+            # by periodic tasks. If the project ID is null (None),
+            # it causes an error when 'hostId' is generated.
+            # If the project ID is null (None), pass the project ID of
+            # the server instead of that of instance action events.
             action['events'] = [self._format_event(
-                evt, action['project_id'], show_traceback=show_traceback,
+                evt, action['project_id'] or instance.project_id,
+                show_traceback=show_traceback,
                 show_host=show_host, show_hostid=show_hostid
             ) for evt in events_raw]
         return {'instanceAction': action}

nova/tests/unit/api/openstack/compute/test_instance_actions.py

@@ -34,6 +34,7 @@ from nova import test
 from nova.tests.unit.api.openstack import fakes
 from nova.tests.unit import fake_instance
 from nova.tests.unit import fake_server_actions
+from nova import utils
 
 
 FAKE_UUID = fake_server_actions.FAKE_UUID
@@ -329,10 +330,68 @@ class InstanceActionsTestV258(InstanceActionsTestV251):
                       six.text_type(ex))
 
 
-class InstanceActionsTestV262(InstanceActionsTestV251):
+class InstanceActionsTestV262(InstanceActionsTestV258):
     wsgi_api_version = "2.62"
     expect_event_hostId = True
     expect_event_host = True
+    instance_project_id = '26cde4489f6749a08834741678df3c4a'
+
+    def fake_get(self, context, instance_uuid, expected_attrs=None,
+                 cell_down_support=False):
+        return objects.Instance(uuid=instance_uuid,
+                                project_id=self.instance_project_id)
+
+    @mock.patch.object(compute_api.InstanceActionAPI, 'action_events_get')
+    @mock.patch.object(compute_api.InstanceActionAPI,
+                       'action_get_by_request_id')
+    def test_get_action_with_events_project_id_none(self, mock_action_get,
+                                                    mock_action_events):
+        fake_request_id = 'req-%s' % uuids.req1
+
+        mock_action_get.return_value = objects.InstanceAction(
+            id=789,
+            action='stop',
+            instance_uuid=uuids.instance,
+            request_id=fake_request_id,
+            user_id=None,
+            project_id=None,
+            start_time=datetime.datetime(2019, 2, 28, 14, 28, 0, 0),
+            finish_time=None,
+            message='',
+            created_at=None,
+            updated_at=None,
+            deleted_at=None,
+            deleted=False)
+
+        mock_action_events.return_value = [
+            objects.InstanceActionEvent(
+                id=5,
+                action_id=789,
+                event='compute_stop_instance',
+                start_time=datetime.datetime(2019, 2, 28, 14, 28, 0, 0),
+                finish_time=datetime.datetime(2019, 2, 28, 14, 30, 0, 0),
+                result='Success',
+                traceback='',
+                created_at=None,
+                updated_at=None,
+                deleted_at=None,
+                deleted=False,
+                host='host2')]
+
+        req = self._get_http_req('os-instance-actions/1',
+                                 use_admin_context=True)
+        res_dict = self.controller.show(req, uuids.instance, fake_request_id)
+
+        # Assert that 'project_id' is null (None) in the response
+        self.assertIsNone(res_dict['instanceAction']['project_id'])
+        self.assertEqual('host2',
+                         res_dict['instanceAction']['events'][0]['host'])
+        # Assert that the 'hostId' is based on 'host' and the project ID
+        # of the server
+        self.assertEqual(utils.generate_hostid(
+            res_dict['instanceAction']['events'][0]['host'],
+            self.instance_project_id),
+            res_dict['instanceAction']['events'][0]['hostId'])
 
 
 class InstanceActionsTestV266(InstanceActionsTestV258):