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# -*- coding: utf-8 -*-
# Description: dns_query_time netdata python.d module
# Author: ilyam8
# SPDX-License-Identifier: GPL-3.0-or-later
from random import choice
from socket import getaddrinfo, gaierror
from threading import Thread
try:
import dns.message
import dns.query
import 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
update_every = 5
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:
resp = dns.query.udp(request, ns, timeout=t)
if (resp.rcode() == dns.rcode.NOERROR and resp.answer):
query_time = resp.time * 1000
else:
query_time = -100
except dns.exception.Timeout:
query_time = -100
finally:
q.put({'_'.join(['ns', ns.replace('.', '_')]): query_time})
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:
dim = [
'_'.join(['ns', ns.replace('.', '_')]),
ns,
'absolute',
]
definitions['dns_group']['lines'].append(dim)
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
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