server.py

#!/usr/bin/python

""" Debian Smart Upload Server runtime

@copyright: 2010  Petr Jasek <jasekpetr@gmail.com>
@license: GNU General Public License version 2 or later
"""

# 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 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

################################################################################

import sys
import getopt
import signal
from BaseHTTPServer import HTTPServer

from daklib.config import Config
from handler import DSUSHandler

class DSUServer(HTTPServer):
    """
    Debian Smart Upload Server class
    """

    STATE_INIT = 0
    STATE_ACTIVE = 1
    STATE_SHUTDOWN = 2
    STATE_RECONFIG = 3

    def __init__(self):
        self.cnf = Config()
        self.address = ('', int(self.cnf["DSUS::port"]))
        HTTPServer.__init__(self, self.address, DSUSHandler)
        self.state = self.STATE_INIT

    def run(self):
        """
        Server routine.
        """
        signal.signal(signal.SIGUSR1, self.handle_signal)
        signal.signal(signal.SIGHUP, self.handle_signal)

        while self.state != self.STATE_SHUTDOWN:
            self.state = self.STATE_ACTIVE
            while self.state == self.STATE_ACTIVE:
                self.handle_request()

    def handle_signal(self, signum, frame):
        """
        Change state with signals.
        """
        if signum == signal.SIGUSR1:
            self.state = self.STATE_SHUTDOWN
            print "Server shutting down"
        elif signum == signal.SIGHUP:
            self.state = self.STATE_RECONFIG
            self.cnf.initialised = False
            self.cnf = Config()
            print "Server reconfigured"


def usage():
    """ Print usage message. """
    print "usage: dsus.py [-h|--help]"


def main(argv):
    """ Handles arguments and runs server. """
    try:
        opts, args = getopt.getopt(argv, "h", ["help"])
    except getopt.GetoptError:
        usage()
        sys.exit(2)

    # parse options
    for opt, arg in opts:
        if opt in ("-h", "--help"):
            usage()
            sys.exit()

    # start server
    server = DSUServer()
    server.run()


if __name__ == "__main__":
    main(sys.argv[1:])