#!/usr/bin/python

# *****************************************************************************
#
# Copyright (c) 2016, EPAM SYSTEMS INC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# ******************************************************************************

import os
import sys
import logging
import traceback
from dlab.fab import *
from dlab.meta_lib import *
from dlab.actions_lib import *
from fabric.api import *
import multiprocessing


def install_libs_on_slaves(slave, data_engine):
    slave_name = data_engine['slave_node_name'] + '{}'.format(slave + 1)
    data_engine['slave_ip'] = get_instance_private_ip_address(
        data_engine['tag_name'], slave_name)
    params = '--os_user {} --instance_ip {} --keyfile "{}" --libs "{}"'\
        .format(data_engine['os_user'], data_engine['slave_ip'],
                data_engine['keyfile'], data_engine['libs'])
    try:
        # Run script to install additional libs
        local("~/scripts/{}.py {}".format('install_additional_libs', params))
    except Exception as err:
        print('Error: {0}'.format(err))
        sys.exit(1)


if __name__ == "__main__":
    instance_class = 'notebook'
    local_log_filename = "{}_{}_{}.log".format(os.environ['conf_resource'], os.environ['edge_user_name'],
                                               os.environ['request_id'])
    local_log_filepath = "/logs/" + os.environ['conf_resource'] + "/" + local_log_filename
    logging.basicConfig(format='%(levelname)-8s [%(asctime)s]  %(message)s',
                        level=logging.DEBUG,
                        filename=local_log_filepath)

    try:
        logging.info('[INSTALLING ADDITIONAL LIBRARIES ON DATAENGINE]')
        print('[INSTALLING ADDITIONAL LIBRARIES ON DATAENGINE]')
        data_engine = dict()
        try:
            data_engine['os_user'] = os.environ['conf_os_user']
            data_engine['service_base_name'] = os.environ['conf_service_base_name']
            data_engine['tag_name'] = data_engine['service_base_name'] + '-Tag'
            data_engine['cluster_name'] = os.environ['computational_id']
            data_engine['master_node_name'] = data_engine['cluster_name'] + '-m'
            data_engine['slave_node_name'] = data_engine['cluster_name'] + '-s'
            data_engine['master_ip'] = get_instance_private_ip_address(
                data_engine['tag_name'], data_engine['master_node_name'])
            data_engine['keyfile'] = '{}{}.pem'.format(os.environ['conf_key_dir'], os.environ['conf_key_name'])
            data_engine['libs'] = os.environ['libs']
            data_engine['instance_count'] = int(node_count(data_engine['cluster_name']))
        except Exception as err:
            append_result("Failed to get parameter.", str(err))
            sys.exit(1)
        params = '--os_user {} --instance_ip {} --keyfile "{}" --libs "{}"' \
            .format(data_engine['os_user'], data_engine['master_ip'],
                    data_engine['keyfile'], data_engine['libs'])
        try:
            # Run script to install additional libs
            local("~/scripts/{}.py {}".format('install_additional_libs', params))
        except:
            traceback.print_exc()
            raise Exception
        try:
            jobs = []
            for slave in range(data_engine['instance_count'] - 1):
                p = multiprocessing.Process(target=install_libs_on_slaves, args=(slave, data_engine))
                jobs.append(p)
                p.start()
            for job in jobs:
                job.join()
            for job in jobs:
                if job.exitcode != 0:
                    raise Exception
        except:
            traceback.print_exc()
            raise Exception
    except Exception as err:
        print('Error: {0}'.format(err))
        append_result("Failed to install additional libraries.", str(err))
        sys.exit(1)