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# -*- coding: utf-8 -*-
# Description: dns_query_time netdata python.d module
# Author: l2isbad
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 random import choice
from threading import Thread
from socket import gethostbyname, gaierror
from base 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
self.update_every = self.timeout + 1 if self.update_every <= self.timeout else self.update_every
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._data_from_check = data
self.order, self.definitions = create_charts(aggregate=self.aggregate, server_list=self.server_list)
self.info(str({'domains': len(self.domains), 'servers': 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 gethostbyname(ns)
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
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