swarming: read configs from luci-config

appengine/swarming/main.py

 # Copyright 2013 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 """This modules is imported by AppEngine and defines the 'app' object.
 
 It is a separate file so that application bootstrapping code like ereporter2,
 that shouldn't be done in unit tests, can be done safely. This file must be
 tested via a smoke test.
 """
@@ skipping 20 matching lines @@
 
   def is_enabled_callback():
     return config.settings().enable_ts_monitoring
 
   # App that serves HTML pages and old API.
   frontend_app = handlers_frontend.create_application(False)
   gae_ts_mon.initialize(frontend_app, is_enabled_fn=is_enabled_callback)
   # Local import, because it instantiates the mapreduce app.
   from mapreduce import main
   gae_ts_mon.initialize(main.APP, is_enabled_fn=is_enabled_callback)
-  # App that serves new endpoints API.
-  api = endpoints.api_server([handlers_endpoints.swarming_api])
+  api = endpoints.api_server([
+    handlers_endpoints.swarming_api,
+    # components.config endpoints for validation and configuring of luci-config
+    # service URL.
+    config.ConfigApi,
+  ])
   ts_mon_metrics.initialize()
   return frontend_app, api, main.APP
 
 
 app, endpoints_app, mapreduce_app = create_application()