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service_event_handler.py
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service_event_handler.py
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#!/usr/bin/env python3
#
# Copyright (C) 2022 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 json
from pathlib import Path
from vyos.config import Config
from vyos.utils.dict import dict_search
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
service_name = 'vyos-event-handler'
service_conf = Path(f'/run/{service_name}.conf')
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'event-handler', 'event']
config = conf.get_config_dict(base,
get_first_key=True,
no_tag_node_value_mangle=True)
return config
def verify(config):
# bail out early - looks like removal from running config
if not config:
return None
for name, event_config in config.items():
if not dict_search('filter.pattern', event_config) or not dict_search(
'script.path', event_config):
raise ConfigError(
'Event-handler: both pattern and script path items are mandatory'
)
if dict_search('script.environment.message', event_config):
raise ConfigError(
'Event-handler: "message" environment variable is reserved for log message text'
)
def generate(config):
if not config:
# Remove old config and return
service_conf.unlink(missing_ok=True)
return None
# Write configuration file
conf_json = json.dumps(config, indent=4)
service_conf.write_text(conf_json)
return None
def apply(config):
if config:
call(f'systemctl restart {service_name}.service')
else:
call(f'systemctl stop {service_name}.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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