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service_monitoring_node-exporter.py
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service_monitoring_node-exporter.py
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#!/usr/bin/env python3
#
# Copyright (C) 2024 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from vyos.config import Config
from vyos.configdict import is_node_changed
from vyos.configverify import verify_vrf
from vyos.template import render
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
service_file = '/etc/systemd/system/node_exporter.service'
systemd_service = 'node_exporter.service'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'monitoring', 'node-exporter']
if not conf.exists(base):
return None
config_data = conf.get_config_dict(
base, key_mangling=('-', '_'), get_first_key=True
)
config_data = conf.merge_defaults(config_data, recursive=True)
tmp = is_node_changed(conf, base + ['vrf'])
if tmp:
config_data.update({'restart_required': {}})
return config_data
def verify(config_data):
# bail out early - looks like removal from running config
if not config_data:
return None
verify_vrf(config_data)
return None
def generate(config_data):
if not config_data:
# Delete systemd files
if os.path.isfile(service_file):
os.unlink(service_file)
return None
# Render node_exporter service_file
render(service_file, 'node_exporter/node_exporter.service.j2', config_data)
return None
def apply(config_data):
# Reload systemd manager configuration
call('systemctl daemon-reload')
if not config_data:
call(f'systemctl stop {systemd_service}')
return
# we need to restart the service if e.g. the VRF name changed
systemd_action = 'reload-or-restart'
if 'restart_required' in config_data:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {systemd_service}')
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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