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# -*- 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 = dict([(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 = dict([(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 = dict([(pool, (2 ** (32 - int(pool.split('/')[1])) - 2))
for pool in self.pools])
# Result: {pool: % utilization, ....} (percent)
pools_util = dict([(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 = dict([(''.join(['le_', k]), v) for k, v in pools_count.items()])
final_util = dict([(''.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
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