#!/usr/local/bin/python2
#
# Copyright (c) 2017-2019  Joe Clarke <jclarke@cisco.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
import json
import sys
import time
import os
from subprocess import Popen, PIPE, call
import shlex
from sparker import Sparker
import pprint
import re
import socket
import CLEUCreds

MONITORING = 'cl-monitoring.ciscolive.network'
CACHE_FILE = '/home/jclarke/monitored_devs.json'
TOOL = 'tool.ciscolive.network'


def get_devs():
    global TOOL

    url = "http://{}/get/switches/json".format(TOOL)

    devs = []
    response = requests.request('GET', url)
    code = 200
    code = response.status_code
    if code == 200:
        devs = json.loads(response.text)

    return devs


def delete_device(dev):
    global MONITORING

    res = call(shlex.split(
        'ssh -2 {} /usr/local/www/observium/delete_device.php {} rrd'.format(MONITORING, dev)))

    return res


if __name__ == '__main__':
    devs = {}
    force = False
    changed_devs = False

    if len(sys.argv) == 2:
        if sys.argv[1] == '-f':
            force = True
    try:
        fd = open(CACHE_FILE, 'r')
        devs = json.load(fd)
        fd.close()
    except:
        pass

    tdevs = get_devs()

    i = 0
    for tdev in tdevs:
        i += 1
        if not tdev['Reachable']:
            continue
        if re.search(r'.*CORE.*', tdev['Hostname'], flags=re.I) or re.search(r'.*MDF.*', tdev['Hostname'], flags=re.I):
            continue
        if tdev['AssetTag'] in devs.keys() and devs[tdev['AssetTag']] != tdev['Hostname']:
            print('=== Deleting device {} from Observium ({} / {}) ==='.format(
                tdev['Hostname'], i, len(tdevs)))
            res = delete_device(devs[tdev['AssetTag']])
            if res != 0:
                print(
                    '\n\n***WARNING: Failed to remove Observium device for {}'.format(devs[tdev['AssetTag']]))
            print('=== DONE. ===')
            changed_devs = True
            del devs[tdev['AssetTag']]

        print('=== Adding DNS record for {} > {} ({} / {}) ==='.format(
            tdev['Hostname'], tdev['IPAddress'], i, len(tdevs)))
        res = call(shlex.split(
            '/home/jclarke/update_dns.py --ip {} --host {}'.format(tdev['IPAddress'], tdev['Hostname'])))
        if res != 0:
            print('\n\n***ERROR: Failed to add DNS record')
            continue
        print('=== DONE. ===')

        if tdev['AssetTag'] not in devs.keys() or force:
            if force:
                print('=== Deleting device {} from Observium ({} / {}) ==='.format(
                    tdev['Hostname'], i, len(tdevs)))
                res = delete_device(tdev['Hostname'])
                if res != 0:
                    print(
                        '\n\n***WARNING: Failed to remove Observium device {}'.format(tdev['Hostname']))
                print('=== DONE. ===')

            time.sleep(3)

            print('=== Adding device {} to Observium ({} / {}) ==='.format(
                tdev['Hostname'], i, len(tdevs)))
            res = call(shlex.split(
                'ssh -2 {} /usr/local/www/observium/add_device.php {} ap v3 CLEUR {} {} sha des'.format(MONITORING, tdev['Hostname'], CLEUCreds.SNMP_TOOL_AUTH_PASS, CLEUCreds.SNMP_TOOL_PRIV_PASS)), stdout=PIPE, stderr=PIPE)
            if res != 0:
                print(
                    '\n\n***ERROR: Failed to add {} to Observium'.format(tdev['Hostname']))
                continue
            print('=== DONE. ===')

            changed_devs = True
            devs[tdev['AssetTag']] = tdev['Hostname']

    if changed_devs:
        fd = open(CACHE_FILE, 'w')
        json.dump(devs, fd)
        fd.close()