Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>This program is free software: you can use, redistribute, and/or modifyit under the terms of the GNU Affero General Public License, version 3or later ("AGPL"), as published by the Free Software Foundation.This program is distributed in the hope that it will be useful, but WITHOUTANY WARRANTY; without even the implied warranty of MERCHANTABILITY orFITNESS FOR A PARTICULAR PURPOSE.You should have received a copy of the GNU Affero General Public Licensealong with this program. If not, see <http://www.gnu.org/licenses/>.