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# Source code for pywws.livelogdaemon

    #!/usr/bin/env python

    # pywws - Python software for USB Wireless Weather Stations
    # http://github.com/jim-easterbrook/pywws
    # Copyright (C) 2008-14  Jim Easterbrook  jim@jim-easterbrook.me.uk

    # 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    """Run 'live logging' as a UNIX daemon.

    This script can also be run with the ``pywws-livelog-daemon`` command. ::
    %s
    Requires the python-daemon library.

    If you get a "function() argument 1 must be code, not str" error, try
    installing python-daemon from PyPI instead of your Linux repos.

    For more information on 'live logging' see :doc:`../guides/livelogging`.

    """

    from __future__ import absolute_import

    __docformat__ = "restructuredtext en"
    __usage__ = """
     usage: %s [options] data_dir log_file start|stop|restart
     options are:
      -h      or --help        display this help
      -p file or --pid file    store pid in 'file' (default /run/lock/pywws.pid)
      -v      or --verbose     increase amount of logging messages
     data_dir is the root directory of the weather data (e.g. /data/weather)
     log_file is a file to write logging to, e.g. /var/log/pywws.log
    """
    __doc__ %= __usage__ % ('python -m pywws.livelogdaemon')

    from daemon.runner import DaemonRunner
    import getopt
    import os
    import sys

    from .LiveLog import LiveLog
    from .Logger import ApplicationLogger

    class Runner(DaemonRunner):
        def __init__(self, data_dir, action, files_preserve, pid_file):
            self.data_dir = os.path.abspath(data_dir)
            # attributes required by daemon runner
            self.stdin_path = '/dev/null'
            self.stdout_path = '/dev/null'
            self.stderr_path = '/dev/null'
            self.pidfile_path = pid_file
            self.pidfile_timeout = 5
            # initialise daemon runner
            DaemonRunner.__init__(self, self)
            self.daemon_context.files_preserve = files_preserve
            self.action = action

        def parse_args(self, argv=None):
            # don't let daemon runner do its own command line parsing
            pass

        def run(self):
            LiveLog(self.data_dir)

    def main(argv=None):
        if argv is None:
            argv = sys.argv
        usage = (__usage__ % (argv[0])).strip()
        try:
            opts, args = getopt.getopt(
                argv[1:], "hp:v", ['help', 'pid=', 'verbose'])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, usage
            return 1
        # process options
        pid_file = '/run/lock/pywws.pid'
        verbose = 0
        for o, a in opts:
            if o in ('-h', '--help'):
                print __doc__.split('\n\n')[0]
                print usage
                return 0
            elif o in ('-p', '--pid'):
                pid_file = a
            elif o in ('-v', '--verbose'):
                verbose += 1
        # check arguments
        if len(args) != 3:
            print >>sys.stderr, 'Error: 3 arguments required\n'
            print >>sys.stderr, usage
            return 2
        logger = ApplicationLogger(verbose, args[1])
        runner = Runner(
            args[0], args[2], map(lambda x: x.stream, logger.handlers), pid_file)
        try:
            runner.do_action()
        except Exception, ex:
            logger.exception(ex)
            return 3
        return 0

    if __name__ == "__main__":
        sys.exit(main())

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