Codice sorgente per pywws.LogData

#!/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.

"""Save weather station history to file
::

%s

This program / module gets data from the weather station's memory and
stores it to file. Each time it is run it fetches all data that is
newer than the last stored data, so it only needs to be run every hour
or so. As the weather station typically stores two weeks' readings
(depending on the logging interval), LogData.py could be run quite
infrequently if you don't need up-to-date data.

There is no date or time information in the raw weather station data,
so LogData.py creates a time stamp for each reading. It uses the
computer's clock, rather than the weather station clock which can not
be read accurately by the computer. A networked computer should have
its clock set accurately by `ntp
<http://en.wikipedia.org/wiki/Network_Time_Protocol>`_.

Synchronisation with the weather station is achieved by waiting for a
change in the current data. There are two levels of synchronisation,
set by the config file or a command line option. Level 0 is quicker,
but is only accurate to around twelve seconds. Level 1 waits until the
weather station stores a new logged record, and gets time stamps
accurate to a couple of seconds. Note that this could take a long
time, if the logging interval is greater than the recommended five
minutes.

"""

__docformat__ = "restructuredtext en"
__usage__ = """
 usage: python -m pywws.LogData [options] data_dir
 options are:
  -h   | --help     display this help
  -c   | --clear    clear weather station's memory full indicator
  -s n | --sync n   set quality of synchronisation to weather station (0 or 1)
  -v   | --verbose  increase number of informative messages
 data_dir is the root directory of the weather data
"""
__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.Logger import ApplicationLogger
from pywws.Process import HOUR
from pywws.TimeZone import Local
from pywws import WeatherStation

[documenti]class DataLogger(object): def __init__(self, params, status, raw_data): self.logger = logging.getLogger('pywws.DataLogger') self.params = params self.status = status self.raw_data = raw_data # connect to weather station ws_type = self.params.get('fixed', 'ws type') if ws_type: self.params.unset('fixed', 'ws type') self.params.set('config', 'ws type', ws_type) ws_type = self.params.get('config', 'ws type', 'Unknown') avoid = eval(self.params.get('config', 'usb activity margin', '3.0')) self.ws = WeatherStation.weather_station( ws_type=ws_type, params=self.params, status=self.status, avoid=avoid) # check for valid weather station type fixed_block = self.check_fixed_block() if ws_type not in ('1080', '3080'): print "Unknown weather station type. Please edit weather.ini" print "and set 'ws type' to '1080' or '3080', as appropriate." if fixed_block['lux_wm2_coeff'] == 0.0: print "Your station is probably a '1080' type." else: print "Your station is probably a '3080' type." sys.exit(1) # check computer clock isn't earlier than last stored data last_stored = self.raw_data.before(datetime.max) if last_stored and datetime.utcnow() < last_stored: raise ValueError('Computer time is earlier than last stored data')
[documenti] def check_fixed_block(self): fixed_block = self.ws.get_fixed_block(unbuffered=True) # check clocks try: s_time = DataStore.safestrptime( fixed_block['date_time'], '%Y-%m-%d %H:%M') except Exception: s_time = None if s_time: c_time = datetime.now().replace(second=0, microsecond=0) diff = abs(s_time - c_time) if diff > timedelta(minutes=2): self.logger.warning( "Computer and weather station clocks disagree by %s (H:M:S).", str(diff)) # store weather station type self.params.set('config', 'ws type', self.ws.ws_type) # store info from fixed block self.status.unset('fixed', 'pressure offset') if not self.params.get('config', 'pressure offset'): self.params.set('config', 'pressure offset', '%g' % ( fixed_block['rel_pressure'] - fixed_block['abs_pressure'])) self.params.unset('fixed', 'fixed block') self.status.set('fixed', 'fixed block', str(fixed_block)) return fixed_block
[documenti] def catchup(self, last_date, last_ptr): fixed_block = self.ws.get_fixed_block(unbuffered=True) # get time to go back to last_stored = self.raw_data.before(datetime.max) if not last_stored: last_stored = datetime.min last_stored += timedelta(seconds=fixed_block['read_period'] * 30) # data_count includes record currently being updated every 48 seconds max_count = fixed_block['data_count'] - 1 count = 0 while last_date > last_stored and count < max_count: data = self.ws.get_data(last_ptr) if data['delay'] is None or data['delay'] > 30: self.logger.error('invalid data at %04x, %s', last_ptr, last_date.isoformat(' ')) last_date -= timedelta(minutes=fixed_block['read_period']) else: self.raw_data[last_date] = data count += 1 last_date -= timedelta(minutes=data['delay']) last_ptr = self.ws.dec_ptr(last_ptr) if count > 0: self.logger.info("%d catchup records", count)
[documenti] def log_data(self, sync=None, clear=False): fixed_block = self.check_fixed_block() # get sync config value if sync is None: if fixed_block['read_period'] <= 5: sync = int(self.params.get('config', 'logdata sync', '1')) else: sync = int(self.params.get('config', 'logdata sync', '0')) # get address and date-time of last complete logged data self.logger.info('Synchronising to weather station') range_hi = datetime.max range_lo = datetime.min last_delay = self.ws.get_data(self.ws.current_pos())['delay'] if last_delay == 0: prev_date = datetime.min else: prev_date = datetime.utcnow() for data, last_ptr, logged in self.ws.live_data(logged_only=(sync > 1)): last_date = data['idx'] self.logger.debug('Reading time %s', last_date.strftime('%H:%M:%S')) if logged: break if sync < 2 and self.ws._station_clock: err = last_date - datetime.fromtimestamp(self.ws._station_clock) last_date -= timedelta( minutes=data['delay'], seconds=err.seconds % 60) self.logger.debug('log time %s', last_date.strftime('%H:%M:%S')) last_ptr = self.ws.dec_ptr(last_ptr) break if sync < 1: hi = last_date - timedelta(minutes=data['delay']) if last_date - prev_date > timedelta(seconds=50): lo = hi - timedelta(seconds=60) elif data['delay'] == last_delay: lo = hi - timedelta(seconds=60) hi = hi - timedelta(seconds=48) else: lo = hi - timedelta(seconds=48) last_delay = data['delay'] prev_date = last_date range_hi = min(range_hi, hi) range_lo = max(range_lo, lo) err = (range_hi - range_lo) / 2 last_date = range_lo + err self.logger.debug('est log time %s +- %ds (%s..%s)', last_date.strftime('%H:%M:%S'), err.seconds, lo.strftime('%H:%M:%S'), hi.strftime('%H:%M:%S')) if err < timedelta(seconds=15): last_ptr = self.ws.dec_ptr(last_ptr) break # go back through stored data, until we catch up with what we've already got self.logger.info('Fetching data') self.catchup(last_date, last_ptr) if clear: self.logger.info('Clearing weather station memory') ptr = self.ws.fixed_format['data_count'][0] self.ws.write_data([(ptr, 1), (ptr+1, 0)])
[documenti] def live_data(self, logged_only=False): next_hour = datetime.utcnow( ).replace(minute=0, second=0, microsecond=0) + HOUR next_ptr = None for data, ptr, logged in self.ws.live_data(logged_only=logged_only): if logged: now = data['idx'] if ptr == next_ptr: # data is contiguous with last logged value self.raw_data[now] = data if now >= next_hour: next_hour += HOUR self.check_fixed_block() else: # catch up missing data self.catchup(now, ptr) next_ptr = self.ws.inc_ptr(ptr) yield data, logged
[documenti]def main(argv=None): if argv is None: argv = sys.argv try: opts, args = getopt.getopt( argv[1:], "hcs:v", ('help', 'clear', 'sync=', 'verbose')) except getopt.error, msg: print >>sys.stderr, 'Error: %s\n' % msg print >>sys.stderr, __usage__.strip() return 1 # process options clear = False sync = None verbose = 0 for o, a in opts: if o in ('-h', '--help'): print __usage__.strip() return 0 elif o in ('-c', '--clear'): clear = True elif o in ('-s', '--sync'): sync = int(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) root_dir = args[0] DataLogger( DataStore.params(root_dir), DataStore.status(root_dir), DataStore.data_store(root_dir)).log_data(sync=sync, clear=clear)
if __name__ == "__main__": sys.exit(main())