Fix marker pagination for /servers

Fixes bug 1053028.

Recent changes to pagination required passing in full sqlalchemy objects
into paginate_query. However, calls to paginate_query were passing in
strings.

Change-Id: Ib1396a78a12aef1a9cdc31f3624af30f19da44b5

nova/api/openstack/compute/servers.py

@@ -496,9 +496,14 @@ class Controller(wsgi.Controller):
                 search_opts['user_id'] = context.user_id
 
         limit, marker = common.get_limit_and_marker(req)
+        try:
             instance_list = self.compute_api.get_all(context,
                                                      search_opts=search_opts,
-                                                 limit=limit, marker=marker)
+                                                     limit=limit,
+                                                     marker=marker)
+        except exception.MarkerNotFound as e:
+            msg = _('marker [%s] not found') % marker
+            raise webob.exc.HTTPBadRequest(explanation=msg)
 
         if is_detail:
             self._add_instance_faults(context, instance_list)

nova/db/sqlalchemy/api.py

@@ -1596,6 +1596,11 @@ def instance_get_all_by_filters(context, filters, sort_key, sort_dir,
     query_prefix = regex_filter(query_prefix, models.Instance, filters)
 
     # paginate query
+    if marker is not None:
+        try:
+            marker = instance_get_by_uuid(context, marker, session=session)
+        except exception.InstanceNotFound as e:
+            raise exception.MarkerNotFound(marker)
     query_prefix = paginate_query(query_prefix, models.Instance, limit,
                            [sort_key, 'created_at', 'id'],
                            marker=marker,

nova/exception.py

@@ -1067,6 +1067,10 @@ class InstanceNotFound(NotFound):
     message = _("Instance %(instance_id)s could not be found.")
 
 
+class MarkerNotFound(NotFound):
+    message = _("Marker %(marker)s could not be found.")
+
+
 class InvalidInstanceIDMalformed(Invalid):
     message = _("Invalid id: %(val)s (expecting \"i-...\").")
 

nova/tests/api/openstack/fakes.py

@@ -402,7 +402,7 @@ def fake_instance_get_all_by_filters(num_servers=5, **kwargs):
                 found_marker = True
                 servers_list = []
         if not marker is None and not found_marker:
-            raise webob.exc.HTTPBadRequest
+            raise exc.MarkerNotFound(marker)
         if not limit is None:
             servers_list = servers_list[:limit]
         return servers_list

nova/tests/test_db_api.py

@@ -126,19 +126,24 @@ class DbApiTestCase(test.TestCase):
         result = db.instance_get_all_by_filters(self.context,
                                                 {'display_name': '%test%'},
                                                 sort_dir="asc",
-                                                marker=test1)
+                                                marker=test1['uuid'])
         self.assertEqual(2, len(result))
         result = db.instance_get_all_by_filters(self.context,
                                                 {'display_name': '%test%'},
                                                 sort_dir="asc",
-                                                marker=test2)
+                                                marker=test2['uuid'])
         self.assertEqual(1, len(result))
         result = db.instance_get_all_by_filters(self.context,
                                                 {'display_name': '%test%'},
                                                 sort_dir="asc",
-                                                marker=test3)
+                                                marker=test3['uuid'])
         self.assertEqual(0, len(result))
 
+        self.assertRaises(exception.MarkerNotFound,
+                          db.instance_get_all_by_filters,
+                          self.context, {'display_name': '%test%'},
+                          marker=str(utils.gen_uuid()))
+
     def test_migration_get_unconfirmed_by_dest_compute(self):
         ctxt = context.get_admin_context()