dnsmasq python.d plugin for netdata

dnsmasq.chart.py

from bases.FrameworkServices.LogService import LogService
import os

ORDER = ['dns_query']
CHARTS = {
	"dns_query": {
		'options': [None, 'DNS Queries', 'responses/s', 'responses', 'dnsmasq_log.dns_query', 'line'],
        'lines': [
            ['successful_query', 'success', 'absolute'],
            ['query_errors', 'error', 'absolute'],
            ['chached_query', 'cached', 'absolute'],
        ]
	}
}

import re

REGEX_SUCCESS = r"reply \S* is [\d.:]+"
REGEX_ERROR = r"reply \S* is NXDOMAIN"
REGEX_CACHED = r"cached \S* is"


class Service(LogService):
    def __init__(self, configuration=None, name=None):
        LogService.__init__(self, configuration=configuration, name=name)
        self.order = ORDER
        self.definitions = CHARTS
        self.configuration = configuration
        self.log_path = self.configuration.get('path')

    def check(self):
        if not (self._find_recent_log_file() and os.access(self.log_path, os.R_OK)):
            self.error('{log_file} not readable or not exist'.format(log_file=self.log_path))
            return False
        if not os.path.getsize(self.log_path):
            self.error('{log_file} is empty'.format(log_file=self.log_path))
            return False
        return True

    def _get_data(self):
        lines = self._get_raw_data()
        success = 0
        error = 0
        cached = 0
        for line in lines:
            success += 1 if re.search(REGEX_SUCCESS, line) is not None else 0
            error += 1 if re.search(REGEX_ERROR, line) is not None else 0
            cached += 1 if re.search(REGEX_CACHED, line) is not None else 0
        return {'successful_query': success, 
        'query_errors': error, 
        'chached_query': cached}

dnsmasq.conf

dnsmasq_query:
    name: "log"
    path: "/var/log/dnsmasq/query.log"