118 lines
3.6 KiB
Python
118 lines
3.6 KiB
Python
#!/usr/bin/env python3
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# common.py - PVC daemon function library, common fuctions
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import subprocess
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import threading
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import signal
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import os
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import time
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import pvcd.log as log
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class OSDaemon(object):
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def __init__(self, command_string, environment, logfile):
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command = command_string.split()
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# Set stdout to be a logfile if set
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if logfile:
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stdout = open(logfile, 'a')
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else:
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stdout = subprocess.PIPE
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# Invoke the process
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self.proc = subprocess.Popen(
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command,
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env=environment,
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stdout=stdout,
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stderr=stdout,
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)
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# Signal the process
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def signal(self, sent_signal):
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signal_map = {
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'hup': signal.SIGHUP,
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'int': signal.SIGINT,
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'term': signal.SIGTERM,
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'kill': signal.SIGKILL
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}
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self.proc.send_signal(signal_map[sent_signal])
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def run_os_daemon(command_string, environment=None, logfile=None):
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daemon = OSDaemon(command_string, environment, logfile)
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return daemon
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# Run a oneshot command, optionally without blocking
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def run_os_command(command_string, background=False, environment=None):
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command = command_string.split()
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if background:
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def runcmd():
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subprocess.run(
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command,
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env=environment,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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thread = threading.Thread(target=runcmd, args=())
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thread.start()
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return 0, None, None
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else:
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command_output = subprocess.run(
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command,
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env=environment,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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)
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return command_output.returncode, command_output.stdout.decode('ascii'), command_output.stderr.decode('ascii')
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# Reload the firewall rules of the system
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def reload_firewall_rules(logger, rules_file):
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logger.out('Reloading firewall configuration', state='o')
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retcode, stdout, stderr = run_os_command('/usr/sbin/nft -f {}'.format(rules_file))
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if retcode != 0:
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logger.out('Failed to reload configuration: {}'.format(stderr), state='e')
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# Create IP address
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def createIPAddress(ipaddr, cidrnetmask, dev):
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run_os_command(
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'ip address add {}/{} dev {}'.format(
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ipaddr,
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cidrnetmask,
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dev
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)
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)
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run_os_command(
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'arping -A -c2 -I {} {}'.format(
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dev,
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ipaddr
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),
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background=True
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)
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# Remove IP address
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def removeIPAddress(ipaddr, cidrnetmask, dev):
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run_os_command(
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'ip address delete {}/{} dev {}'.format(
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ipaddr,
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cidrnetmask,
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dev
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)
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)
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