Docserver: Only fetch content versions in the crons, not their contents.

chrome/common/extensions/docs/server2/compiled_file_system.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 sys
 
 import schema_util
 from docs_server_utils import ToUnicode
 from file_system import FileNotFoundError
 from future import Future
@@ skipping 211 matching lines @@
     cache_entry = self._list_object_store.Get(path).Get()
     if (cache_entry is not None) and (version == cache_entry.version):
       return Future(value=cache_entry._cache_data)
 
     def next(files):
       cache_data = self._compilation_function(path, files)
       self._list_object_store.Set(path, _CacheEntry(cache_data, version))
       return cache_data
     return self._RecursiveList(path).Then(next)
 
-  def GetFileVersion(self, path):
+  # _GetFileVersionFromCache and _GetFileListingVersionFromCache are exposed
+  # *only* so that ChainedCompiledFileSystem can optimise its caches. *Do not*
+  # use these methods otherwise, they don't do what you want. Use
+  # FileSystem.Stat on the FileSystem that this CompiledFileSystem uses.
+
+  def _GetFileVersionFromCache(self, path):
     cache_entry = self._file_object_store.Get(path).Get()
     if cache_entry is not None:
-      return cache_entry.version
-    return self._file_system.Stat(path).version
+      return Future(value=cache_entry.version)
+    stat_future = self._file_system.StatAsync(path)
+    return Future(callback=lambda: stat_future.Get().version)
 
-  def GetFileListingVersion(self, path):
+  def _GetFileListingVersionFromCache(self, path):
     path = ToDirectory(path)
     cache_entry = self._list_object_store.Get(path).Get()
     if cache_entry is not None:
-      return cache_entry.version
-    return self._file_system.Stat(path).version
-
-  def FileExists(self, path):
-    return self._file_system.Exists(path)
+      return Future(value=cache_entry.version)
+    stat_future = self._file_system.StatAsync(path)
+    return Future(callback=lambda: stat_future.Get().version)
 
   def GetIdentity(self):
     return self._file_system.GetIdentity()