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# Code source de pywws.LiveLog

    #!/usr/bin/env python

    # pywws - Python software for USB Wireless Weather Stations
    # http://github.com/jim-easterbrook/pywws
    # Copyright (C) 2008-13  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.

    """Get weather data, store it, and process it.

    Run this continuously, having set what tasks are to be done. ::

    %s

    For more information on using ``LiveLog.py``, see
    :doc:`../guides/livelogging`.

    """

    __docformat__ = "restructuredtext en"
    __usage__ = """
     usage: python -m pywws.LiveLog [options] data_dir
     options are:
      -h      or --help      display this help
      -l file or --log file  write log information to file
      -v      or --verbose   increase amount of reassuring messages
     data_dir is the root directory of the weather data (e.g. /data/weather)
    """
    __doc__ %= __usage__
    __usage__ = __doc__.split('\n')[0] + __usage__

    from datetime import datetime, timedelta
    import getopt
    import logging
    import os
    import sys
    import time

    from pywws import DataStore
    from pywws import Localisation
    from pywws.LogData import Catchup, CheckFixedBlock
    from pywws.Logger import ApplicationLogger
    from pywws import Process
    from pywws import Tasks
    from pywws import WeatherStation

    def LiveLog(data_dir):
        logger = logging.getLogger('pywws.LiveLog')
        params = DataStore.params(data_dir)
        status = DataStore.status(data_dir)
        # localise application
        Localisation.SetApplicationLanguage(params)
        # connect to weather station
        ws_type = params.get('fixed', 'ws type')
        if ws_type:
            params.unset('fixed', 'ws type')
            params.set('config', 'ws type', ws_type)
        ws_type = params.get('config', 'ws type', '1080')
        ws = WeatherStation.weather_station(
            ws_type=ws_type, params=params, status=status)
        fixed_block = CheckFixedBlock(ws, params, status, logger)
        # open data file stores
        raw_data = DataStore.data_store(data_dir)
        calib_data = DataStore.calib_store(data_dir)
        hourly_data = DataStore.hourly_store(data_dir)
        daily_data = DataStore.daily_store(data_dir)
        monthly_data = DataStore.monthly_store(data_dir)
        # create a RegularTasks object
        asynch = eval(params.get('config', 'asynchronous', 'False'))
        tasks = Tasks.RegularTasks(
            params, status, calib_data, hourly_data, daily_data, monthly_data,
            asynch=asynch)
        # get time of last logged data
        last_stored = raw_data.before(datetime.max)
        if last_stored == None:
            last_stored = datetime.min
        if datetime.utcnow() < last_stored:
            raise ValueError('Computer time is earlier than last stored data')
        last_stored += timedelta(minutes=2)
        # get live data
        next_hour = datetime.utcnow().replace(
                                minute=0, second=0, microsecond=0) + Process.HOUR
        next_ptr = None
        try:
            for data, ptr, logged in ws.live_data(
                                        logged_only=(not tasks.has_live_tasks())):
                now = data['idx']
                if logged:
                    if ptr == next_ptr:
                        # data is contiguous with last logged value
                        raw_data[now] = data
                    else:
                        # catch up missing data
                        Catchup(ws, logger, raw_data, now, ptr)
                    next_ptr = ws.inc_ptr(ptr)
                    # process new data
                    Process.Process(params, status, raw_data, calib_data,
                                    hourly_data, daily_data, monthly_data)
                    # do tasks
                    tasks.do_tasks()
                    if now >= next_hour:
                        next_hour += Process.HOUR
                        fixed_block = CheckFixedBlock(ws, params, status, logger)
                        # save any unsaved data
                        raw_data.flush()
                else:
                    tasks.do_live(data)
        finally:
            tasks.stop_thread()
        return 0

    def main(argv=None):
        if argv is None:
            argv = sys.argv
        try:
            opts, args = getopt.getopt(argv[1:], "hl:v", ['help', 'log=', 'verbose'])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, __usage__.strip()
            return 1
        # process options
        logfile = None
        verbose = 0
        for o, a in opts:
            if o in ('-h', '--help'):
                print __usage__.strip()
                return 0
            elif o in ('-l', '--log'):
                logfile = a
            elif o in ('-v', '--verbose'):
                verbose += 1
        # check arguments
        if len(args) != 1:
            print >>sys.stderr, 'Error: 1 argument required\n'
            print >>sys.stderr, __usage__.strip()
            return 2
        logger = ApplicationLogger(verbose, logfile)
        return LiveLog(args[0])

    if __name__ == "__main__":
        logger = logging.getLogger('pywws')
        try:
            sys.exit(main())
        except KeyboardInterrupt:
            pass
        except Exception, e:
            logger.exception(str(e))

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