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#!/usr/bin/env python3
# ###################################################
# Copyright (C) 2008-2017 The Unknown Horizons Team
# team@unknown-horizons.org
# This file is part of Unknown Horizons.
#
# Unknown Horizons 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 2 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, write to the
# Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# ###################################################
import argparse
import os
import sys
from horizons import network
from horizons.network.server import Server
def daemonize() -> int:
"""
POSIX compliant daemonize.
"""
try:
pid = os.fork()
if pid > 0:
sys.exit(0)
except OSError as e:
sys.stderr.write("Unable to fork: ({:d}) {}\n".format(e.errno, e.strerror))
sys.exit(1)
os.umask(0)
os.setsid()
# fork again to remove a possible session leadership gained after setsid()
try:
pid = os.fork()
if pid > 0:
sys.exit(0)
except OSError as e:
sys.stderr.write("Unable to fork: ({:d}) {}\n".format(e.errno, e.strerror))
sys.exit(1)
return os.getpid()
def redirect(stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
"""
TODO: No clue what this is about.
"""
for f in sys.stdout, sys.stderr:
f.flush()
ifd = open(stdin, 'r')
ofd = open(stdout, 'a+')
efd = ofd if (stdout == stderr) else open(stderr, 'a+')
os.dup2(ifd.fileno(), sys.stdin.fileno())
os.dup2(ofd.fileno(), sys.stdout.fileno())
os.dup2(efd.fileno(), sys.stderr.fileno())
def port(value: str) -> int:
"""
Check whether the given string is a valid port.
"""
port = int(value)
max_port = 2**16
if not (1 <= port < max_port):
raise argparse.ArgumentTypeError(
'{} is not between 1 and {}'.format(port, max_port))
return port
def main(args=None):
"""
Main entry point of the script. Parses command line options and starts the server.
"""
if not network.enet:
sys.stderr.write('Could not find enet module.\n')
sys.exit(1)
parser = argparse.ArgumentParser()
parser.add_argument('host', help='Host to listen on')
parser.add_argument('-p', dest='port', type=port,
help='Port to listen on, default 2002', default=2002)
parser.add_argument('-s', dest='statistic_file', default=None)
if os.name == 'posix':
parser.add_argument('-d', dest='daemonize', action='store_true',
help='Daemonize the server.', default=False)
parser.add_argument('-l', dest='log_file', default=None)
parser.add_argument('-P', dest='pid_file', default=None)
config = parser.parse_args(args)
if config.pid_file and os.path.isfile(config.pid_file):
sys.stderr.write("Error: Pidfile '{}' already exists.\n".format(config.pid_file))
sys.stderr.write("Please make sure no other server is running and remove this file\n")
sys.exit(1)
pid = os.getpid()
if config.daemonize:
pid = daemonize()
# daemon must redirect!
if config.log_file is None:
config.log_file = '/dev/null'
if config.log_file:
redirect('/dev/null', config.log_file, config.log_file)
if config.pid_file:
with open(config.pid_file, 'w') as f:
f.write(str(pid))
try:
server = Server(config.host, config.port, config.statistic_file)
server.run()
except network.NetworkException as e:
sys.stderr.write("Error: {}\n".format(e))
sys.exit(2)
if config.pid_file:
os.unlink(config.pid_file)
if __name__ == '__main__':
main()
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