Use plain routes list for os-migrations endpoint instead of stevedore

This patch adds os-migrations related routes by a plain list,
instead of using stevedore. After all the Nova API endpoints moves
to the plain routes list, the usage of stevedore for API loading will
be removed from Nova.

Partial-implement-blueprint api-no-more-extensions-pike

Change-Id: Ic6ded36d2247a01f8b41027cc07ef251b3570a46

nova/api/openstack/compute/migrations.py

@@ -19,9 +19,6 @@ from nova.objects import base as obj_base
 from nova.policies import migrations as migrations_policies
 
 
-ALIAS = "os-migrations"
-
-
 class MigrationsController(wsgi.Controller):
     """Controller for accessing migrations in OpenStack API."""
 
@@ -80,20 +77,3 @@ class MigrationsController(wsgi.Controller):
             return {'migrations': self._output(req, migrations, True)}
 
         return {'migrations': self._output(req, migrations)}
-
-
-class Migrations(extensions.V21APIExtensionBase):
-    """Provide data on migrations."""
-    name = "Migrations"
-    alias = ALIAS
-    version = 1
-
-    def get_resources(self):
-        resources = []
-        resource = extensions.ResourceExtension(ALIAS,
-                                                MigrationsController())
-        resources.append(resource)
-        return resources
-
-    def get_controller_extensions(self):
-        return []

nova/api/openstack/compute/routes.py

@@ -49,6 +49,7 @@ from nova.api.openstack.compute import instance_usage_audit_log
 from nova.api.openstack.compute import keypairs
 from nova.api.openstack.compute import lock_server
 from nova.api.openstack.compute import migrate_server
+from nova.api.openstack.compute import migrations
 from nova.api.openstack.compute import multinic
 from nova.api.openstack.compute import pause_server
 from nova.api.openstack.compute import quota_sets
@@ -159,6 +160,10 @@ instance_usage_audit_log_controller = functools.partial(_create_controller,
     instance_usage_audit_log.InstanceUsageAuditLogController, [], [])
 
 
+migrations_controller = functools.partial(_create_controller,
+    migrations.MigrationsController, [], [])
+
+
 quota_set_controller = functools.partial(_create_controller,
     quota_sets.QuotaSetsController, [], [])
 
@@ -342,6 +347,9 @@ ROUTE_LIST = (
         'GET': [keypairs_controller, 'show'],
         'DELETE': [keypairs_controller, 'delete']
     }),
+    ('/os-migrations', {
+        'GET': [migrations_controller, 'index']
+    }),
     ('/os-quota-sets/{id}', {
         'GET': [quota_set_controller, 'show'],
         'PUT': [quota_set_controller, 'update'],

setup.cfg

@@ -89,7 +89,6 @@ nova.api.v21.extensions =
     instance_actions = nova.api.openstack.compute.instance_actions:InstanceActions
     ips = nova.api.openstack.compute.ips:IPs
     limits = nova.api.openstack.compute.limits:Limits
-    migrations = nova.api.openstack.compute.migrations:Migrations
     multiple_create = nova.api.openstack.compute.multiple_create:MultipleCreate
     networks = nova.api.openstack.compute.networks:Networks
     networks_associate = nova.api.openstack.compute.networks_associate:NetworksAssociate