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

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 from file_system import FileSystem, FileNotFoundError
   6 from future import Gettable, Future
   7
   8
   9 class OfflineFileSystem(FileSystem):
  10   '''An offline FileSystem which masquerades as another file system. It throws
  11   FileNotFound error for all operations, and overrides GetIdentity.
  12   '''
  13   def __init__(self, fs):
  14     self._fs = fs
  15
  16   def Read(self, paths):
  17     def raise_file_not_found():
  18       raise FileNotFoundError('File system is offline, cannot read %s' % paths)
  19     return Future(delegate=Gettable(raise_file_not_found))
  20
  21   def Stat(self, path):
  22     raise FileNotFoundError('File system is offline, cannot read %s' % path)
  23
  24   def GetIdentity(self):
  25     return self._fs.GetIdentity()