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

   1 # Copyright (c) 2012 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 import logging
   6
   7 from appengine_wrappers import memcache
   8 from object_store import ObjectStore
   9
  10 class _AsyncMemcacheGetFuture(object):
  11   def __init__(self, rpc):
  12     self._rpc = rpc
  13
  14   def Get(self):
  15     return self._rpc.get_result()
  16
  17 class MemcacheObjectStore(ObjectStore):
  18   def __init__(self, namespace):
  19     self._namespace = namespace
  20
  21   def SetMulti(self, mapping):
  22     # talking_alarm_clock always fails because the zip is too big.
  23     # TODO(kalman): store example zips in blobstore.
  24     if any(key.find('talking_alarm_clock') != -1 for key in mapping.iterkeys()):
  25       return
  26     try:
  27       memcache.Client().set_multi_async(mapping, namespace=self._namespace)
  28     except ValueError as e:
  29       logging.error('Caught "ValueError: %s" when mapping keys %s' % (
  30           e, mapping.keys()))
  31
  32   def GetMulti(self, keys):
  33     rpc = memcache.Client().get_multi_async(keys, namespace=self._namespace)
  34     return _AsyncMemcacheGetFuture(rpc)
  35
  36   def DelMulti(self, keys):
  37     memcache.delete_multi(keys, namespace=self._namespace)