def decode_element(element_tuple):
""" Converts a tuple to a path element protobuf object. """
path_element = entity_pb.Path_Element()
path_element.set_type(element_tuple[0])
if isinstance(element_tuple[1], int):
path_element.set_id(element_tuple[1])
else:
path_element.set_name(element_tuple[1])
return path_element
def _Dynamic_TransactionQuery(self, request, response):
if not request.has_ancestor():
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'No ancestor in transactional query.')
app_id = datastore_types.ResolveAppId(None)
if (datastore_rpc._GetDatastoreType(app_id) !=
datastore_rpc.BaseConnection.HIGH_REPLICATION_DATASTORE):
raise apiproxy_errors.ApplicationError(
datastore_pb.Error.BAD_REQUEST,
'remote_api supports transactional queries only in the '
'high-replication datastore.')
entity_group_key = entity_pb.Reference()
entity_group_key.CopyFrom(request.ancestor())
group_path = entity_group_key.mutable_path()
root = entity_pb.Path_Element()
root.MergeFrom(group_path.element(0))
group_path.clear_element()
group_path.add_element().CopyFrom(root)
eg_element = group_path.add_element()
eg_element.set_type(metadata.EntityGroup.KIND_NAME)
eg_element.set_id(metadata.EntityGroup.ID)
begin_request = datastore_pb.BeginTransactionRequest()
begin_request.set_app(app_id)
tx = datastore_pb.Transaction()
self.__call('datastore_v3', 'BeginTransaction', begin_request, tx)
request.mutable_transaction().CopyFrom(tx)
self.__call('datastore_v3', 'RunQuery', request, response.mutable_result())
get_request = datastore_pb.GetRequest()
get_request.mutable_transaction().CopyFrom(tx)
get_request.add_key().CopyFrom(entity_group_key)
get_response = datastore_pb.GetResponse()
self.__call('datastore_v3', 'Get', get_request, get_response)
entity_group = get_response.entity(0)
response.mutable_entity_group_key().CopyFrom(entity_group_key)
if entity_group.has_entity():
response.mutable_entity_group().CopyFrom(entity_group.entity())
self.__call('datastore_v3', 'Commit', tx, datastore_pb.CommitResponse())