Add missing ComputeHostNotFound exception in live-migration

Commit c824982e6a did not update
expected exceptions. Therefore we end up with 500 internal server
error when triggering targeted live migration to non-existing compute
node. This patch adds ComputeHostNotFound to expected exception list
in both, conductor and API.

Change-Id: If515a90217a8e329d932dcacb357b78081c505c1
Related-bug: 1538837

nova/api/openstack/compute/migrate_server.py

@@ -102,6 +102,7 @@ class MigrateServerController(wsgi.Controller):
             raise exc.HTTPNotFound(explanation=e.format_message())
         except (exception.NoValidHost,
                 exception.ComputeServiceUnavailable,
+                exception.ComputeHostNotFound,
                 exception.InvalidHypervisorType,
                 exception.InvalidCPUInfo,
                 exception.UnableToMigrateToSelf,

nova/conductor/manager.py

@@ -166,6 +166,7 @@ class ComputeTaskManager(base.Base):
     @messaging.expected_exceptions(
         exception.NoValidHost,
         exception.ComputeServiceUnavailable,
+        exception.ComputeHostNotFound,
         exception.InvalidHypervisorType,
         exception.InvalidCPUInfo,
         exception.UnableToMigrateToSelf,

nova/tests/functional/api_sample_tests/test_migrate_server.py

@@ -16,6 +16,7 @@
 import mock
 from oslo_utils import versionutils
 
+from nova import exception
 from nova import objects
 from nova.tests.functional.api_sample_tests import test_servers
 
@@ -75,6 +76,19 @@ class MigrateServerSamplesJsonTest(test_servers.ServersSampleBase):
         # Get api samples to server live migrate request.
         self._check_post_live_migrate_server()
 
+    def test_live_migrate_compute_host_not_found(self):
+        hostname = 'dummy-host'
+
+        def fake_execute(_self):
+            raise exception.ComputeHostNotFound(host=hostname)
+        self.stub_out('nova.conductor.tasks.live_migrate.'
+                      'LiveMigrationTask._execute', fake_execute)
+
+        response = self._do_post('servers/%s/action' % self.uuid,
+                                 'live-migrate-server',
+                                 {'hostname': hostname})
+        self.assertEqual(400, response.status_code)
+
 
 class MigrateServerSamplesJsonTestV225(MigrateServerSamplesJsonTest):
     sample_dir = "os-migrate-server"
@@ -113,3 +127,17 @@ class MigrateServerSamplesJsonTestV230(MigrateServerSamplesJsonTest):
         self._check_post_live_migrate_server(
             req_subs={'hostname': self.compute.host,
                       'force': 'True'})
+
+    def test_live_migrate_compute_host_not_found(self):
+        hostname = 'dummy-host'
+
+        def fake_execute(_self):
+            raise exception.ComputeHostNotFound(host=hostname)
+        self.stub_out('nova.conductor.tasks.live_migrate.'
+                      'LiveMigrationTask._execute', fake_execute)
+
+        response = self._do_post('servers/%s/action' % self.uuid,
+                                 'live-migrate-server',
+                                 {'hostname': hostname,
+                                  'force': 'False'})
+        self.assertEqual(400, response.status_code)

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

@@ -217,6 +217,10 @@ class MigrateServerTestsV21(admin_only_action_common.CommonTests):
         self._test_migrate_live_failed_with_exception(
             exception.ComputeServiceUnavailable(host='host'))
 
+    def test_migrate_live_compute_service_not_found(self):
+        self._test_migrate_live_failed_with_exception(
+            exception.ComputeHostNotFound(host='host'))
+
     def test_migrate_live_invalid_hypervisor_type(self):
         self._test_migrate_live_failed_with_exception(
             exception.InvalidHypervisorType())
@@ -375,6 +379,9 @@ class MigrateServerTestsV234(MigrateServerTestsV230):
     def test_migrate_live_compute_service_unavailable(self):
         pass
 
+    def test_migrate_live_compute_service_not_found(self):
+        pass
+
     def test_migrate_live_invalid_hypervisor_type(self):
         pass
 

nova/tests/unit/conductor/test_conductor.py

@@ -1417,7 +1417,8 @@ class ConductorTaskTestCase(_BaseTaskTestCase, test_compute.BaseTestCase):
                exc.InvalidCPUInfo(reason='dummy'),
                exc.UnableToMigrateToSelf(instance_id='dummy', host='dummy'),
                exc.InvalidLocalStorage(path='dummy', reason='dummy'),
-               exc.MigrationSchedulerRPCError(reason='dummy')]
+               exc.MigrationSchedulerRPCError(reason='dummy'),
+               exc.ComputeHostNotFound(host='dummy')]
         for ex in exs:
             self._test_migrate_server_deals_with_expected_exceptions(ex)