Docserver: SidenavDataSource refactor, transition to DataSourceRegistry

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

 # Copyright 2013 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.
 
 
 class DataSource(object):
   '''
   Defines an abstraction for all DataSources.
 
   DataSources must have two public methods, get and Cron. A DataSource is
-  initialized with a ServerInstance. Anything in the ServerInstance can be used
-  by the DataSource.
+  initialized with a ServerInstance and a Request (defined in servlet.py).
+  Anything in the ServerInstance can be used by the DataSource. Request is None
+  when DataSources are created for Cron.
 
   DataSources are used to provide templates with access to data. DataSources may
   not access other DataSources and any logic or data that is useful to other
   DataSources must be moved to a different class.
   '''
+  def __init__(self, server_instance, request):
+    pass
+
   def Cron(self):
     '''Must cache all files needed by |get| to persist them. Called on a live
-    file system and can access files not in cache.
+    file system and can access files not in cache. |request| will be None.
     '''
     raise NotImplementedError(self.__class__)
 
   def get(self, key):
     '''Returns a dictionary or list that can be consumed by a template. Called
     on an offline file system and can only access files in the cache.
     '''
     raise NotImplementedError(self.__class__)