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

This patch adds server-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: Idd8bd0b500db85826ee730e91f9f7e3e5667044e

nova/api/openstack/compute/routes.py

@@ -59,6 +59,7 @@ from nova.api.openstack.compute import remote_consoles
 from nova.api.openstack.compute import rescue
 from nova.api.openstack.compute import security_groups
 from nova.api.openstack.compute import server_metadata
+from nova.api.openstack.compute import server_migrations
 from nova.api.openstack.compute import server_password
 from nova.api.openstack.compute import server_tags
 from nova.api.openstack.compute import server_usage
@@ -218,6 +219,10 @@ server_metadata_controller = functools.partial(_create_controller,
     server_metadata.ServerMetadataController, [], [])
 
 
+server_migrations_controller = functools.partial(_create_controller,
+    server_migrations.ServerMigrationsController, [], [])
+
+
 server_os_interface_controller = functools.partial(_create_controller,
     attach_interfaces.InterfaceAttachmentController, [], [])
 
@@ -430,6 +435,16 @@ ROUTE_LIST = (
         'PUT': [server_metadata_controller, 'update'],
         'DELETE': [server_metadata_controller, 'delete'],
     }),
+    ('/servers/{server_id}/migrations', {
+        'GET': [server_migrations_controller, 'index']
+    }),
+    ('/servers/{server_id}/migrations/{id}', {
+        'GET': [server_migrations_controller, 'show'],
+        'DELETE': [server_migrations_controller, 'delete']
+    }),
+    ('/servers/{server_id}/migrations/{id}/action', {
+        'POST': [server_migrations_controller, 'action']
+    }),
     ('/servers/{server_id}/os-interface', {
         'GET': [server_os_interface_controller, 'index'],
         'POST': [server_os_interface_controller, 'create']

nova/api/openstack/compute/server_migrations.py

@@ -26,9 +26,6 @@ from nova.i18n import _
 from nova.policies import servers_migrations as sm_policies
 
 
-ALIAS = 'servers:migrations'
-
-
 def output(migration):
     """Returns the desired output of the API from an object.
 
@@ -153,22 +150,3 @@ class ServerMigrationsController(wsgi.Controller):
             raise exc.HTTPNotFound(explanation=e.format_message())
         except exception.InvalidMigrationState as e:
             raise exc.HTTPBadRequest(explanation=e.format_message())
-
-
-class ServerMigrations(extensions.V21APIExtensionBase):
-    """Server Migrations API."""
-    name = "ServerMigrations"
-    alias = 'server-migrations'
-    version = 1
-
-    def get_resources(self):
-        parent = {'member_name': 'server',
-                  'collection_name': 'servers'}
-        member_actions = {'action': 'POST'}
-        resources = [extensions.ResourceExtension(
-            'migrations', ServerMigrationsController(),
-            parent=parent, member_actions=member_actions)]
-        return resources
-
-    def get_controller_extensions(self):
-        return []

setup.cfg

@@ -96,7 +96,6 @@ nova.api.v21.extensions =
     security_groups = nova.api.openstack.compute.security_groups:SecurityGroups
     server_diagnostics = nova.api.openstack.compute.server_diagnostics:ServerDiagnostics
     server_external_events = nova.api.openstack.compute.server_external_events:ServerExternalEvents
-    server_migrations = nova.api.openstack.compute.server_migrations:ServerMigrations
     server_groups = nova.api.openstack.compute.server_groups:ServerGroups
     services = nova.api.openstack.compute.services:Services
     tenant_networks = nova.api.openstack.compute.tenant_networks:TenantNetworks