# -*- coding:utf-8 -*-
#############################################################################
# Copyright (c) 2020 Huawei Technologies Co.,Ltd.
#
# openGauss is licensed under Mulan PSL v2.
# You can use this software according to the terms
# and conditions of the Mulan PSL v2.
# You may obtain a copy of Mulan PSL v2 at:
#
#          http://license.coscl.org.cn/MulanPSL2
#
# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OF ANY KIND,
# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
# See the Mulan PSL v2 for more details.
# ----------------------------------------------------------------------------
# Description  : drop_node_with_cm_impl.py
#############################################################################

import sys
import os

sys.path.append(sys.path[0] + "/../../../../")
from base_utils.os.net_util import NetUtil
from base_utils.executor.cmd_executor import CmdExecutor

from gspylib.common.ErrorCode import ErrorCode
from gspylib.common.Common import DefaultValue
from gspylib.component.CM.CM_OLAP.CM_OLAP import CM_OLAP
from gspylib.threads.SshTool import SshTool
from gspylib.os.gsfile import g_file
from impl.dropnode.DropnodeImpl import DropnodeImpl


class DropNodeWithCmImpl(DropnodeImpl):
    def __init__(self, drop_node):
        super(DropNodeWithCmImpl, self).__init__(drop_node)
        self.drop_nodes = list()
        self.stoped_nodes = list()
        self.cm_component = None
        self.ssh_tool = None

    def init_global_value(self):
        """
        Initial global value
        """
        self.drop_nodes = [node for node in self.context.clusterInfo.dbNodes
                           for drop_ip in self.context.hostIpListForDel
                           if drop_ip in node.backIps]
        self.ssh_tool = SshTool([node.name for node in self.context.clusterInfo.dbNodes])

        self.cm_component = CM_OLAP()
        self.cm_component.binPath = os.path.realpath(os.path.join(
            self.context.clusterInfo.appPath, "bin"))
        local_node = [node for node in self.context.clusterInfo.dbNodes
                      if NetUtil.GetHostIpOrName() == node.name][0]
        self.cm_component.instInfo = local_node.cmagents[0]
        self.cm_component.logger = self.logger

    def check_drop_cm_node(self):
        """
        Check drop CM node prerequisites
        """
        # 1.check node number
        if len(self.context.clusterInfo.dbNodes) < 3:
            raise Exception(ErrorCode.GAUSS_358["GAUSS_35811"])

        if len(self.context.clusterInfo.dbNodes) - len(self.context.hostIpListForDel) < 2:
            error_msg = "The current cluster contains {0} nodes. " \
                        "A maximum of {1} " \
                        "nodes can be dropped.".format(len(self.context.clusterInfo.dbNodes),
                                                       len(self.context.clusterInfo.dbNodes) - 2)
            raise Exception(ErrorCode.GAUSS_358["GAUSS_35811"] + error_msg)
        # 2.check cm_server number after drop_node
        all_cm_server_nodes = [node for node in self.context.clusterInfo.dbNodes if node.cmservers]
        drop_node_with_cm_server = [node for node in self.drop_nodes if node.cmservers]
        if (len(all_cm_server_nodes) - len(drop_node_with_cm_server)) < 2:
            raise Exception("Too many cm_server nodes are dropped.A maximum of {0} cm_server "
                            "nodes can be dropped.".format(len(all_cm_server_nodes) - 2))

    def _stop_drop_node(self):
        """
        try to stop drop nodes
        """
        for node in self.drop_nodes:
            stop_para = (node.id, "", 30, "", "")
            # stop node
            try:
                self.cm_component.stop_cluster(stop_para)
                self.stoped_nodes.append(node)
            except Exception as exp:
                self.logger.debug("Stop node failed [{0}]. Exception {1}".format(node.id,
                                                                                 str(exp)))
                self.logger.log("Success stoped node [{0}].".format(node.id))

    def _generate_flag_file_on_drop_nodes(self):
        """
        Modify static file on drop nodes
        """
        for drop_node in self.stoped_nodes:
            self.logger.debug("Start generate drop node flag file on drop node.")
            flag_file = os.path.realpath(os.path.join(self.context.clusterInfo.appPath,
                                                      "bin", "drop_node_flag"))
            cmd = g_file.SHELL_CMD_DICT["createFile"] % (flag_file,
                                                         DefaultValue.FILE_MODE, flag_file)
            CmdExecutor.execCommandWithMode(cmd, self.ssh_tool, host_list=[drop_node.name])

            self.logger.log("Generate drop flag file on "
                            "drop node {0} successfully.".format(drop_node.name))

    def restart_new_cluster(self):
        """
        Restart cluster
        """
        self.logger.log("Restart cluster ...")
        stop_para = (0, "", 300, "", "")
        self.cm_component.stop_cluster(stop_para)
        # for flush dcc configuration
        DefaultValue.remove_metadata_and_dynamic_config_file(self.user,
                                                             self.ssh_tool, self.logger)
        self.cm_component.startCluster(self.user)

    def run(self):
        """
        start dropnode
        """
        self.logger.log("Drop node with CM node is running.")
        self.init_global_value()
        self.check_drop_cm_node()
        self.change_user()
        self.logger.log("[gs_dropnode]Start to drop nodes of the cluster.")
        self.checkAllStandbyState()
        self.dropNodeOnAllHosts()
        self.operationOnlyOnPrimary()
        self._stop_drop_node()
        self._generate_flag_file_on_drop_nodes()
        self.modifyStaticConf()
        self.restart_new_cluster()
        self.logger.log("[gs_dropnode] Success to drop the target nodes.")