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Diffstat (limited to 'python.d/isc_dhcpd.chart.py')
| -rw-r--r-- | python.d/isc_dhcpd.chart.py | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/python.d/isc_dhcpd.chart.py b/python.d/isc_dhcpd.chart.py new file mode 100644 index 00000000..54fbfb1f --- /dev/null +++ b/python.d/isc_dhcpd.chart.py @@ -0,0 +1,167 @@ +# -*- coding: utf-8 -*- +# Description: isc dhcpd lease netdata python.d module +# Author: l2isbad + +from base import SimpleService +from time import mktime, strptime, gmtime, time +from os import stat +try: + from ipaddress import IPv4Address as ipaddress + from ipaddress import ip_network + have_ipaddress = True +except ImportError: + have_ipaddress = False +try: + from itertools import filterfalse as filterfalse +except ImportError: + from itertools import ifilterfalse as filterfalse + + +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 algorithm 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 + + def check(self): + if not self._get_raw_data(): + self.error('Make sure leases_path is correct and leases log file 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(return_utf(pool)) for pool in self.pools]: + self.error('Pools list is empty') + return False + except (ValueError, IndexError, AttributeError, SyntaxError) as e: + self.error('Pools configurations is incorrect', str(e)) + return False + + # Creating static charts + self.order = ['parse_time', 'leases_size', 'utilization', 'total'] + self.definitions = {'utilization': + {'options': + [None, 'Pools utilization', 'used %', 'Utilization', 'isc_dhcpd.util', 'line'], + 'lines': []}, + 'total': + {'options': + [None, 'Total all pools', 'leases', 'Utilization', 'isc_dhcpd.total', 'line'], + 'lines': [['total', 'leases', 'absolute']]}, + 'parse_time': + {'options': + [None, 'Parse time', 'ms', 'Parse stats', 'isc_dhcpd.parse', 'line'], + 'lines': [['ptime', 'time', 'absolute']]}, + 'leases_size': + {'options': + [None, 'dhcpd.leases file size', 'kilobytes', 'Parse stats', 'isc_dhcpd.lsize', 'line'], + 'lines': [['lsize', 'size', 'absolute']]}} + # Creating dynamic charts + 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', 'Pools', 'isc_dhcpd.lease', 'area'], + 'lines': [[''.join(['le_', pool]), pool, 'absolute']]} + + self.info('Plugin was started succesfully') + return True + + def _get_raw_data(self): + """ + Parses log file + :return: tuple( + [ipaddress, lease end time, ...], + time to parse leases file + ) + """ + try: + with open(self.leases_path, 'rt') as dhcp_leases: + time_start = time() + part1 = filterfalse(find_lease, dhcp_leases) + part2 = filterfalse(find_ends, dhcp_leases) + raw_result = dict(zip(part1, part2)) + time_end = time() + + file_parse_time = round((time_end - time_start) * 1000) + + except Exception as e: + self.error("Failed to parse leases file:", str(e)) + return None + + else: + result = (raw_result, file_parse_time) + return result + + def _get_data(self): + """ + :return: dict + """ + raw_leases = self._get_raw_data() + + if not raw_leases: + return None + + # Result: {ipaddress: end lease time, ...} + all_leases = {k[6:len(k)-3]:v[7:len(v)-2] for k, v in raw_leases[0].items()} + + # Result: [active binding, active binding....]. (Expire time (ends date;) - current time > 0) + active_leases = [k for k, v in all_leases.items() if is_binding_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()} + + to_netdata = {'total': len(active_leases)} + to_netdata.update({'lsize': int(stat(self.leases_path)[6] / 1024)}) + to_netdata.update({'ptime': int(raw_leases[1])}) + to_netdata.update(final_util) + to_netdata.update(final_count) + + return to_netdata + + +def is_binding_active(binding): + return mktime(strptime(binding, '%w %Y/%m/%d %H:%M:%S')) - mktime(gmtime()) > 0 + + +def is_address_in(address, pool): + return ipaddress(return_utf(address)) in ip_network(return_utf(pool)) + + +def find_lease(value): + return value[0:3] != 'lea' + + +def find_ends(value): + return value[2:6] != 'ends' + +def return_utf(s): + # python2 returns "<type 'str'>" for simple strings + # python3 returns "<class 'str'>" for unicode strings + if str(type(s)) == "<type 'str'>": + return unicode(s, 'utf-8') + return s |