Code source de LiveLog

#!/usr/bin/env python

"""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 LiveLog.py [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

[docs]def LiveLog(data_dir): logger = logging.getLogger('pywws.LiveLog') params = DataStore.params(data_dir) # localise application Localisation.SetApplicationLanguage(params) # connect to weather station ws_type = params.get('config', 'ws type') if ws_type: params._config.remove_option('config', 'ws type') params.set('fixed', 'ws type', ws_type) ws_type = params.get('fixed', 'ws type', '1080') ws = WeatherStation.weather_station(ws_type=ws_type, params=params) fixed_block = CheckFixedBlock(ws, params, logger) if not fixed_block: logger.error("Invalid data from weather station") return 3 # 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 tasks = Tasks.RegularTasks( params, calib_data, hourly_data, daily_data, monthly_data) # get time of last logged data two_minutes = timedelta(minutes=2) 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 += two_minutes # get live data hour = timedelta(hours=1) next_hour = datetime.utcnow().replace( minute=0, second=0, microsecond=0) + hour next_ptr = None 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, raw_data, calib_data, hourly_data, daily_data, monthly_data) # do tasks tasks.do_tasks() if now >= next_hour: next_hour += hour fixed_block = CheckFixedBlock(ws, params, logger) if not fixed_block: logger.error("Invalid data from weather station") return 3 params.flush() else: tasks.do_live(data) return 0
[docs]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))