class DatabaseSyncCommand(Subcommand):

    """

    Controls the database synchronization service.

    """

    name = 'dbsync'

    description = "Manage the database synchronization service"

    def add_parser_args(self, parser):

        subparsers = parser.add_subparsers(title='subcommands')

        start = subparsers.add_parser('start', help="Start service")

        start.set_defaults(subcommand='start')

        stop = subparsers.add_parser('stop', help="Stop service")

        stop.set_defaults(subcommand='stop')

        if sys.platform == 'linux2':

            parser.add_argument('-p', '--pidfile',

                                help="Path to PID file", metavar='PATH')

            parser.add_argument('-D', '--do-not-daemonize',

                                action='store_false', dest='daemonize', default=True,

                                help="Do not daemonize when starting.")

    def run(self, args):

        from rattail.db.sync import linux as dbsync

        if args.subcommand == 'start':

            try:

                dbsync.start_daemon(self.config, args.pidfile, args.daemonize)

            except KeyboardInterrupt:

                if not args.daemonize:

                    self.stderr.write("Interrupted.\n")

                else:

                    raise

        elif args.subcommand == 'stop':

            dbsync.stop_daemon(self.config, args.pidfile)