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import subprocess
import socket
import os
import os.path
import re
import sqlite3
import shutil
import tempfile
from pynag import Model
INPROGRESS_DIR = '/etc/nagios3-inprogress'
INPROGRESS_CFG = '/etc/nagios3-inprogress/nagios.cfg'
INPROGRESS_CONF_D = '/etc/nagios3-inprogress/conf.d'
CHARM_CFG = '/etc/nagios3-inprogress/conf.d/charm.cfg'
MAIN_NAGIOS_BAK = '/etc/nagios3.bak'
MAIN_NAGIOS_DIR = '/etc/nagios3'
MAIN_NAGIOS_CFG = '/etc/nagios3/nagios.cfg'
PLUGIN_PATH = '/usr/lib/nagios/plugins'
Model.cfg_file = INPROGRESS_CFG
Model.pynag_directory = INPROGRESS_CONF_D
reduce_RE = re.compile('[\W_]')
def check_ip(n):
try:
socket.inet_pton(socket.AF_INET, n)
return True
except socket.error:
try:
socket.inet_pton(socket.AF_INET6, n)
return True
except socket.error:
return False
def get_ip_and_hostname(remote_unit, relation_id=None):
args = ["relation-get", "private-address", remote_unit]
if relation_id is not None:
args.extend(['-r', relation_id])
hostname = subprocess.check_output(args).strip()
if hostname is None or not len(hostname):
print "relation-get failed"
return 2
if check_ip(hostname):
# Some providers don't provide hostnames, so use the remote unit name.
ip_address = hostname
else:
ip_address = socket.getaddrinfo(hostname, None)[0][4][0]
return (ip_address, remote_unit.replace('/', '-'))
def refresh_hostgroups():
""" Not the most efficient thing but since we're only
parsing what is already on disk here its not too bad """
hosts = [x['host_name'] for x in Model.Host.objects.all if x['host_name']]
hgroups = {}
for host in hosts:
try:
(service, unit_id) = host.rsplit('-', 1)
except ValueError:
continue
if service in hgroups:
hgroups[service].append(host)
else:
hgroups[service] = [host]
# Find existing autogenerated
auto_hgroups = Model.Hostgroup.objects.filter(notes__contains='#autogenerated#')
auto_hgroups = [x.get_attribute('hostgroup_name') for x in auto_hgroups]
# Delete the ones not in hgroups
to_delete = set(auto_hgroups).difference(set(hgroups.keys()))
for hgroup_name in to_delete:
try:
hgroup = Model.Hostgroup.objects.get_by_shortname(hgroup_name)
hgroup.delete()
except ValueError:
pass
for hgroup_name, members in hgroups.iteritems():
try:
hgroup = Model.Hostgroup.objects.get_by_shortname(hgroup_name)
except ValueError:
hgroup = Model.Hostgroup()
hgroup.set_filename(CHARM_CFG)
hgroup.set_attribute('hostgroup_name', hgroup_name)
hgroup.set_attribute('notes', '#autogenerated#')
hgroup.set_attribute('members', ','.join(members))
hgroup.save()
def _make_check_command(args):
args = [str(arg) for arg in args]
# There is some worry of collision, but the uniqueness of the initial
# command should be enough.
signature = reduce_RE.sub('_', ''.join(
[os.path.basename(arg) for arg in args]))
Model.Command.objects.reload_cache()
try:
cmd = Model.Command.objects.get_by_shortname(signature)
except ValueError:
cmd = Model.Command()
cmd.set_attribute('command_name', signature)
cmd.set_attribute('command_line', ' '.join(args))
cmd.save()
return signature
def _extend_args(args, cmd_args, switch, value):
args.append(value)
cmd_args.extend((switch, '"$ARG%d$"' % len(args)))
def customize_http(service, name, extra):
args = []
cmd_args = []
plugin = os.path.join(PLUGIN_PATH, 'check_http')
port = extra.get('port', 80)
path = extra.get('path', '/')
args = [port, path]
cmd_args = [plugin, '-p', '"$ARG1$"', '-u', '"$ARG2$"']
if 'status' in extra:
_extend_args(args, cmd_args, '-e', extra['status'])
if 'host' in extra:
_extend_args(args, cmd_args, '-H', extra['host'])
cmd_args.extend(('-I', '$HOSTADDRESS$'))
else:
cmd_args.extend(('-H', '$HOSTADDRESS$'))
check_command = _make_check_command(cmd_args)
cmd = '%s!%s' % (check_command, '!'.join([str(x) for x in args]))
service.set_attribute('check_command', cmd)
return True
def customize_mysql(service, name, extra):
plugin = os.path.join(PLUGIN_PATH, 'check_mysql')
args = []
cmd_args = [plugin, '-H', '$HOSTADDRESS$']
if 'user' in extra:
_extend_args(args, cmd_args, '-u', extra['user'])
if 'password' in extra:
_extend_args(args, cmd_args, '-p', extra['password'])
check_command = _make_check_command(cmd_args)
cmd = '%s!%s' % (check_command, '!'.join([str(x) for x in args]))
service.set_attribute('check_command', cmd)
return True
def customize_nrpe(service, name, extra):
plugin = os.path.join(PLUGIN_PATH, 'check_nrpe')
args = []
cmd_args = [plugin, '-H', '$HOSTADDRESS$']
if name in ('mem', 'swap'):
cmd_args.extend(('-c', 'check_%s' % name))
elif 'command' in extra:
cmd_args.extend(('-c', extra['command']))
else:
return False
check_command = _make_check_command(cmd_args)
cmd = '%s!%s' % (check_command, '!'.join([str(x) for x in args]))
service.set_attribute('check_command', cmd)
return True
def customize_service(service, family, name, extra):
customs = {'http': customize_http,
'mysql': customize_mysql,
'nrpe': customize_nrpe}
if family in customs:
return customs[family](service, name, extra)
return False
def get_pynag_host(target_id, owner_unit=None, owner_relation=None):
try:
host = Model.Host.objects.get_by_shortname(target_id)
except ValueError:
host = Model.Host()
host.set_filename(CHARM_CFG)
host.set_attribute('host_name', target_id)
host.set_attribute('use', 'generic-host')
host.save()
host = Model.Host.objects.get_by_shortname(target_id)
apply_host_policy(target_id, owner_unit, owner_relation)
return host
def get_pynag_service(target_id, service_name):
services = Model.Service.objects.filter(host_name=target_id,
service_description=service_name)
if len(services) == 0:
service = Model.Service()
service.set_filename(CHARM_CFG)
service.set_attribute('service_description', service_name)
service.set_attribute('host_name', target_id)
service.set_attribute('use', 'generic-service')
else:
service = services[0]
return service
def apply_host_policy(target_id, owner_unit, owner_relation):
ssh_service = get_pynag_service(target_id, 'SSH')
ssh_service.set_attribute('check_command', 'check_ssh')
ssh_service.save()
def get_valid_relations():
for x in subprocess.Popen(['relation-ids', 'monitors'],
stdout=subprocess.PIPE).stdout:
yield x.strip()
for x in subprocess.Popen(['relation-ids', 'nagios'],
stdout=subprocess.PIPE).stdout:
yield x.strip()
def get_valid_units(relation_id):
for x in subprocess.Popen(['relation-list', '-r', relation_id],
stdout=subprocess.PIPE).stdout:
yield x.strip()
def _replace_in_config(find_me, replacement):
with open(INPROGRESS_CFG) as cf:
with tempfile.NamedTemporaryFile(dir=INPROGRESS_DIR, delete=False) as new_cf:
for line in cf:
new_cf.write(line.replace(find_me, replacement))
new_cf.flush()
os.chmod(new_cf.name, 0644)
os.unlink(INPROGRESS_CFG)
os.rename(new_cf.name, INPROGRESS_CFG)
def _commit_in_config(find_me, replacement):
with open(MAIN_NAGIOS_CFG) as cf:
with tempfile.NamedTemporaryFile(dir=MAIN_NAGIOS_DIR, delete=False) as new_cf:
for line in cf:
new_cf.write(line.replace(find_me, replacement))
new_cf.flush()
os.chmod(new_cf.name, 0644)
os.unlink(MAIN_NAGIOS_CFG)
os.rename(new_cf.name, MAIN_NAGIOS_CFG)
def initialize_inprogress_config():
if os.path.exists(INPROGRESS_DIR):
shutil.rmtree(INPROGRESS_DIR)
shutil.copytree(MAIN_NAGIOS_DIR, INPROGRESS_DIR)
_replace_in_config(MAIN_NAGIOS_DIR, INPROGRESS_DIR)
if os.path.exists(CHARM_CFG):
os.unlink(CHARM_CFG)
def flush_inprogress_config():
if not os.path.exists(INPROGRESS_DIR):
return
if os.path.exists(MAIN_NAGIOS_BAK):
shutil.rmtree(MAIN_NAGIOS_BAK)
if os.path.exists(MAIN_NAGIOS_DIR):
shutil.move(MAIN_NAGIOS_DIR, MAIN_NAGIOS_BAK)
shutil.move(INPROGRESS_DIR, MAIN_NAGIOS_DIR)
# now that directory has been changed need to update the config file to reflect the real stuff..
_commit_in_config(INPROGRESS_DIR, MAIN_NAGIOS_DIR)
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