Extensions Docs Server: Efficient MemcacheFileSystem

chrome/common/extensions/docs/server2/handler.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 logging
 import os
 import sys
 
 from appengine_wrappers import webapp
 from appengine_wrappers import memcache
@@ skipping 48 matching lines @@
 # Global cache of instances because Handler is recreated for every request.
 SERVER_INSTANCES = {}
 
 def _GetInstanceForBranch(channel_name, local_path):
   branch = BRANCH_UTILITY.GetBranchNumberForChannelName(channel_name)
   if branch in SERVER_INSTANCES:
     return SERVER_INSTANCES[branch]
   if branch == 'local':
     file_system = LocalFileSystem(local_path)
   else:
-    fetcher = AppEngineUrlFetcher(
-        _GetURLFromBranch(branch) + '/' + EXTENSIONS_PATH)
-    file_system = MemcacheFileSystem(SubversionFileSystem(fetcher),
-                                     AppEngineMemcache(branch))
+    svn_url = _GetURLFromBranch(branch) + '/' + EXTENSIONS_PATH
+    stat_fetcher = AppEngineUrlFetcher(
+        svn_url.replace(url_constants.SVN_URL, url_constants.VIEWVC_URL))
+    fetcher = AppEngineUrlFetcher(svn_url)
+    file_system = MemcacheFileSystem(
+        SubversionFileSystem(fetcher, stat_fetcher),
+        AppEngineMemcache(branch))
 
   cache_builder = FileSystemCache.Builder(file_system)
   api_list_data_source = APIListDataSource(cache_builder,
                                            file_system,
                                            API_PATH,
                                            PUBLIC_TEMPLATE_PATH)
   intro_data_source = IntroDataSource(cache_builder,
                                       [INTRO_PATH, ARTICLE_PATH])
   samples_data_source_factory = SamplesDataSource.Factory(branch,
                                                           file_system,
@@ skipping 65 matching lines @@
         self._NavigateToPath('apps/samples.html')
       return
 
     # Redirect paths like "directory" to "directory/". This is so relative file
     # paths will know to treat this as a directory.
     if os.path.splitext(path)[1] == '' and path[-1] != '/':
       self.redirect(path + '/')
     path = path.replace('/chrome/', '')
     path = path.strip('/')
     self._NavigateToPath(path)