Docserver move cron jobs to a backend instance

chrome/common/extensions/docs/server2/appengine_wrappers.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
+import re
 
 from app_yaml_helper import AppYamlHelper
 
 def GetAppVersion():
   if 'CURRENT_VERSION_ID' in os.environ:
-    # The version ID looks like 2-0-25.36712548, we only want the 2-0-25.
-    return os.environ['CURRENT_VERSION_ID'].split('.', 1)[0]
+    # The version ID looks like 2-0-25.36712548 or on the backend
+    # backend_name:2-0-25.23982345. We only want the 2-0-25.

[方觉(Fang Jue), 2013/08/14 01:47:42]

Backend's version ID will look like <backend-name>.123456. A backend is actually
a separate version of the app (which means that update_server.py also needs to
be updated to also deploy the backend). Maybe include the current version number
in the backend name or pass it in /_cron/ URL?

+    return re.match(
+        r'(?:[_\w-]+:)?(\d+-\d+-\d+)\.\d+$',
+        os.environ['CURRENT_VERSION_ID']).group(1)
   # Not running on appengine, get it from the app.yaml file ourselves.
   app_yaml_path = os.path.join(os.path.split(__file__)[0], 'app.yaml')
   with open(app_yaml_path, 'r') as app_yaml:
     return AppYamlHelper.ExtractVersion(app_yaml.read())
 
 def IsDevServer():
   return os.environ.get('SERVER_SOFTWARE', '').find('Development') == 0
 
 # This will attempt to import the actual App Engine modules, and if it fails,
 # they will be replaced with fake modules. This is useful during testing.
@@ skipping 241 matching lines @@
       db._store.pop(key, None)
       return _RPC()
 
     @staticmethod
     def put_async(value):
       db._store[value.key] = value
       return _RPC()
 
   class BlobReferenceProperty(object):
     pass