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# Copyright 2013 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 cPickle
import traceback
from appengine_wrappers import db
# A collection of the data store models used throughout the server.
# These values are global within datastore.
class PersistentObjectStoreItem(db.Model):
pickled_value = db.BlobProperty()
@classmethod
def CreateKey(cls, namespace, key):
path = '%s/%s' % (namespace, key)
try:
return db.Key.from_path(cls.__name__, path)
except Exception:
# Probably AppEngine's BadValueError for the name being too long, but
# it's not documented which errors can actually be thrown here, so catch
# 'em all.
raise ValueError(
'Exception thrown when trying to create db.Key from path %s: %s' % (
path, traceback.format_exc()))
@classmethod
def CreateItem(cls, namespace, key, value):
return PersistentObjectStoreItem(key=cls.CreateKey(namespace, key),
pickled_value=cPickle.dumps(value))
def GetValue(self):
return cPickle.loads(self.pickled_value)
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