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 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, skip_not_found=False):
  17     if skip_not_found: return Future(value={})
  18     def raise_file_not_found():
  19       raise FileNotFoundError('File system is offline, cannot read %s' % paths)
  20     return Future(callback=raise_file_not_found)
  21
  22   def Stat(self, path):
  23     raise FileNotFoundError('File system is offline, cannot read %s' % path)
  24
  25   def GetIdentity(self):
  26     return self._fs.GetIdentity()
  27
  28   def GetVersion(self):
  29     return self._fs.GetVersion()