pvc/node-daemon/pvcd/common.py

91 lines
3.0 KiB
Python
Raw Normal View History

#!/usr/bin/env python3
# common.py - PVC daemon function library, common fuctions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 <https://www.gnu.org/licenses/>.
#
###############################################################################
import subprocess
import threading
import signal
import os
import time
import pvcd.log as log
class OSDaemon(object):
def __init__(self, command_string, environment, logfile):
command = command_string.split()
# Set stdout to be a logfile if set
if logfile:
stdout = open(logfile, 'a')
else:
stdout = subprocess.PIPE
# Invoke the process
self.proc = subprocess.Popen(
command,
env=environment,
stdout=stdout,
stderr=stdout,
)
# Signal the process
def signal(self, sent_signal):
signal_map = {
'hup': signal.SIGHUP,
'int': signal.SIGINT,
'term': signal.SIGTERM
}
self.proc.send_signal(signal_map[sent_signal])
def run_os_daemon(command_string, environment=None, logfile=None):
daemon = OSDaemon(command_string, environment, logfile)
return daemon
# Run a oneshot command, optionally without blocking
def run_os_command(command_string, background=False, environment=None):
command = command_string.split()
if background:
def runcmd():
subprocess.run(
command,
env=environment,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
thread = threading.Thread(target=runcmd, args=())
thread.start()
return 0, None, None
else:
command_output = subprocess.run(
command,
env=environment,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
return command_output.returncode, command_output.stdout.decode('ascii'), command_output.stderr.decode('ascii')
# Reload the firewall rules of the system
def reload_firewall_rules(rules_dir):
log.echo('Updating firewall rules', '', 'o')
rules_file = '{}/base.nft'.format(rules_dir)
retcode, stdout, stderr = run_os_command('/usr/sbin/nft -f {}'.format(rules_file))
if retcode != 0:
log.echo('Failed to reload rules: {}'.format(stderr), '', 'e')