# ! /usr/bin/env python

# Copyright 2017 --Yang Hu--
#
# 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.


__author__ = 'Yang Hu'

import paramiko, os
import threading
import logging
# from drip_logging.drip_logging_handler import *
import multiprocessing

logger = logging.getLogger(__name__)
if not getattr(logger, 'handler_set', None):
    logger.setLevel(logging.INFO)
    h = logging.StreamHandler()
    formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    h.setFormatter(formatter)
    logger.addHandler(h)
    logger.handler_set = True

retry = 0


def install_engine(vm, return_dict):
    try:
        logger.info("Starting docker engine installation on: " + (vm.ip))
        paramiko.util.log_to_file("deployment.log")
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(vm.ip, username=vm.user, key_filename=vm.key, timeout=30)
        stdin, stdout, stderr = ssh.exec_command("sudo dpkg --get-selections | grep docker")
        temp_list = stdout.readlines()
        temp_str = ""
        for i in temp_list: temp_str += i
        if temp_str.find("docker") != -1:
            logger.info("Docker engine arleady installated on: " + (vm.ip) + " Skiping")
            return_dict[vm.ip] = "SUCCESS"
            return "SUCCESS"
        sftp = ssh.open_sftp()
        sftp.chdir('/tmp/')
        file_path = os.path.dirname(os.path.abspath(__file__))
        install_script = file_path + "/" + "docker_engine.sh"
        sftp.put(install_script, "engine_setup.sh")
        stdin, stdout, stderr = ssh.exec_command("sudo sh /tmp/engine_setup.sh")
        output = stdout.read()
        logger.info("stdout: " + (output))
        output = stderr.read()
        logger.info("stderr: " + (output))
        logger.info("Finised docker engine installation on: " + (vm.ip))
    except Exception as e:
        global retry
        if retry < 10:
            logger.warning(vm.ip + " " + str(e) + ". Retrying")
            retry += 1
            return install_engine(vm, return_dict)

        logger.error(vm.ip + " " + str(e))
        return_dict[vm.ip] = "ERROR:" + vm.ip + " " + str(e)
        return "ERROR:" + vm.ip + " " + str(e)
    ssh.close()
    retry = 0
    return_dict[vm.ip] = "SUCCESS"
    return "SUCCESS"


def run(vm_list, rabbitmq_host, owner):
    rabbit = DRIPLoggingHandler(host=rabbitmq_host, port=5672, user=owner)
    logger.addHandler(rabbit)

    manager = multiprocessing.Manager()
    return_dict = manager.dict()
    jobs = []
    for i in vm_list:
        # ret = install_engine(i)
        p = multiprocessing.Process(target=install_engine, args=(i, return_dict,))
        jobs.append(p)
        p.start()

    for proc in jobs:
        proc.join()
    if "ERROR" in return_dict.values(): return "ERROR"

    # if "ERROR" in ret: return ret
    return "SUCCESS"
