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Diffstat (limited to 'python.d/isc_dhcdp.chart.py')
-rw-r--r-- | python.d/isc_dhcdp.chart.py | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/python.d/isc_dhcdp.chart.py b/python.d/isc_dhcdp.chart.py new file mode 100644 index 0000000000..82b2c4593f --- /dev/null +++ b/python.d/isc_dhcdp.chart.py @@ -0,0 +1,109 @@ +# -*- coding: utf-8 -*- +# Description: isc dhcpd lease netdata python.d module +# Author: l2isbad + +from base import SimpleService +from re import compile, search +from time import mktime, strptime, gmtime +try: + from ipaddress import IPv4Address as ipaddress + from ipaddress import ip_network + have_ipaddress = True +except ImportError: + have_ipaddress = False + +priority = 60000 +retries = 60 +update_every = 60 + +class Service(SimpleService): + def __init__(self, configuration=None, name=None): + SimpleService.__init__(self, configuration=configuration, name=name) + self.leases_path = self.configuration.get('leases_path', '/var/lib/dhcp/dhcpd.leases') + self.pools = self.configuration.get('pools') + + # Will work only with 'default' db-time-format (weekday year/month/day hour:minute:second) + # TODO: update the regex to parse correctly 'local' db-time-format + # (epoch <seconds-since-epoch>; # <day-name> <month-name> <day-number> <hours>:<minutes>:<seconds> <year>) + # Also only ipv4 supported + self.regex = compile(r'(\d+(?:\.\d+){3}).*?((?<=ends )[0-9].*?(?=;))') + + def check(self): + if not self._get_raw_data(): + self.error('Make sure leases_path is correct and dhcpd.leases is readable by netdata') + return False + elif not have_ipaddress: + self.error('No ipaddress module. Please install (py2-ipaddress in case of python2)') + return False + else: + try: + self.pools = self.pools.split() + if not [ip_network(pool) for pool in self.pools]: + self.error('Pools list is empty') + return False + except (ValueError, IndexError, AttributeError, SyntaxError): + self.error('Pools configurations is incorrect') + return False + + # Creating dynamic charts + self.order = ['utilization'] + self.definitions = {'utilization': {'options': [None, 'Pools utilization', 'used %', 'Utulization', 'isc_dhcpd.util', 'line'], 'lines': []} } + for pool in self.pools: + self.definitions['utilization']['lines'].append([''.join(['ut_', pool]), pool, 'absolute']) + self.order.append(''.join(['leases_', pool])) + self.definitions[''.join(['leases_', pool])] = \ + {'options': [None, 'Active leases', 'leases', 'Leases', 'isc_dhcpd.lease', 'area'], + 'lines': [[''.join(['le_', pool]), pool, 'absolute']]} + + self.info('Plugin was started succesfully') + return True + + def _get_raw_data(self): + """ + Open log file + :return: str + """ + try: + with open(self.leases_path, 'rt') as leases: + result = leases.read() + except Exception: + return None + else: + return result + + def _get_data(self): + """ + Parse dhcpd.leases file. + """ + raw_leases = self._get_raw_data() + all_leases = dict(self.regex.findall(' '.join(raw_leases.split()))) + + if not all_leases: + self.error('Cant parse leases file correctly') + return None + + # Result: [active binding, active binding....]. (Expire time (ends date;) - current time > 0) + active_leases = [k for k, v in all_leases.items() if is_bind_active(all_leases[k])] + + # Result: {pool: number of active bindings in pool, ...} + pools_count = {pool: len([lease for lease in active_leases if is_address_in(lease, pool)]) for pool in self.pools} + + # Result: {pool: number of host ip addresses in pool, } + pools_max = {pool: (2 ** (32 - int(pool.split('/')[1])) - 2) for pool in self.pools} + + # Result: {pool: % utilization, ....} (percent) + pools_util = {pool:int(round(float(pools_count[pool]) / pools_max[pool] * 100, 0)) for pool in self.pools} + + # Bulding dicts to send to netdata + final_count = {''.join(['le_', k]): v for k, v in pools_count.items()} + final_util = {''.join(['ut_', k]): v for k, v in pools_util.items()} + + final_count.update(final_util) + + return final_count + +def is_bind_active(binding): + return mktime(strptime(binding, '%w %Y/%m/%d %H:%M:%S')) - mktime(gmtime()) > 0 + +def is_address_in(address, pool): + return ipaddress(address) in ip_network(pool) |