summaryrefslogtreecommitdiffstats
path: root/python.d/dns_query_time.chart.py
blob: 9a794a9c94e4569b32037ab1388a913e8b3828eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
# -*- coding: utf-8 -*-
# Description: dns_query_time netdata python.d module
# Author: l2isbad

from random import choice
from threading import Thread
from socket import getaddrinfo, gaierror

try:
    from time import monotonic as time
except ImportError:
    from time import time
try:
    import dns.message, dns.query, dns.name
    DNS_PYTHON = True
except ImportError:
    DNS_PYTHON = False
try:
    from queue import Queue
except ImportError:
    from Queue import Queue

from bases.FrameworkServices.SimpleService import SimpleService


# default module values (can be overridden per job in `config`)
update_every = 5
priority = 60000
retries = 60


class Service(SimpleService):
    def __init__(self, configuration=None, name=None):
        SimpleService.__init__(self, configuration=configuration, name=name)
        self.order = list()
        self.definitions = dict()
        self.timeout = self.configuration.get('response_timeout', 4)
        self.aggregate = self.configuration.get('aggregate', True)
        self.domains = self.configuration.get('domains')
        self.server_list = self.configuration.get('dns_servers')

    def check(self):
        if not DNS_PYTHON:
            self.error('\'python-dnspython\' package is needed to use dns_query_time.chart.py')
            return False

        self.timeout = self.timeout if isinstance(self.timeout, int) else 4

        if not all([self.domains, self.server_list,
                    isinstance(self.server_list, str), isinstance(self.domains, str)]):
            self.error('server_list and domain_list can\'t be empty')
            return False
        else:
            self.domains, self.server_list = self.domains.split(), self.server_list.split()

        for ns in self.server_list:
            if not check_ns(ns):
                self.info('Bad NS: %s' % ns)
                self.server_list.remove(ns)
                if not self.server_list:
                    return False

        data = self._get_data(timeout=1)

        down_servers = [s for s in data if data[s] == -100]
        for down in down_servers:
            down = down[3:].replace('_', '.')
            self.info('Removed due to non response %s' % down)
            self.server_list.remove(down)
            if not self.server_list:
                return False

        self.order, self.definitions = create_charts(aggregate=self.aggregate, server_list=self.server_list)
        return True

    def _get_data(self, timeout=None):
        return dns_request(self.server_list, timeout or self.timeout, self.domains)


def dns_request(server_list, timeout, domains):
    threads = list()
    que = Queue()
    result = dict()

    def dns_req(ns, t, q):
        domain = dns.name.from_text(choice(domains))
        request = dns.message.make_query(domain, dns.rdatatype.A)

        try:
            dns_start = time()
            dns.query.udp(request, ns, timeout=t)
            dns_end = time()
            query_time = round((dns_end - dns_start) * 1000)
            q.put({'_'.join(['ns', ns.replace('.', '_')]): query_time})
        except dns.exception.Timeout:
            q.put({'_'.join(['ns', ns.replace('.', '_')]): -100})

    for server in server_list:
        th = Thread(target=dns_req, args=(server, timeout, que))
        th.start()
        threads.append(th)

    for th in threads:
        th.join()
        result.update(que.get())

    return result


def check_ns(ns):
    try:
        return getaddrinfo(ns, 'domain')[0][4][0]
    except gaierror:
        return False


def create_charts(aggregate, server_list):
    if aggregate:
        order = ['dns_group']
        definitions = {'dns_group': {'options': [None, 'DNS Response Time', 'ms', 'name servers',
                                                 'dns_query_time.response_time', 'line'], 'lines': []}}
        for ns in server_list:
            definitions['dns_group']['lines'].append(['_'.join(['ns', ns.replace('.', '_')]), ns, 'absolute'])

        return order, definitions
    else:
        order = [''.join(['dns_', ns.replace('.', '_')]) for ns in server_list]
        definitions = dict()
        for ns in server_list:
            definitions[''.join(['dns_', ns.replace('.', '_')])] = {'options': [None, 'DNS Response Time', 'ms', ns,
                                                                                'dns_query_time.response_time', 'area'],
                                                                    'lines': [['_'.join(['ns', ns.replace('.', '_')]),
                                                                               ns, 'absolute']]}
        return order, definitions