160 lines
3.9 KiB
Python
160 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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from __future__ import print_function
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import socket, time, urllib2
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from weakref import WeakValueDictionary
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from devsup.hooks import addHook
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from devsup.util import StoppableThread
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from devsup.db import IOScanListBlock
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try:
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import pymetar
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except ImportError:
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print("The pymetar package could not be imported!")
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raise
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_isofmt = '%Y-%m-%d %H:%M:%SZ'
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def iso2sec(str):
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"""Convert the string returned by pymetar to posix time.
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"""
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rtime = time.mktime(time.strptime(str, _isofmt))
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return rtime - (time.altzone if time.daylight else time.timezone)
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_stations = WeakValueDictionary()
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def getStation(name):
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try:
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return _stations[name]
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except KeyError:
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S = ReportScanner(name)
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_stations[name] = S
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return S
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class DataWatcher(object):
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"""Weather watcher device support.
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field(INP,"weather KISP getTemperatureCelsius")
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of
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field(INP,"weather KISP showID")
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"""
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# disable automatic RVAL -> VAL conversion.
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# We will update VAL ourselves.
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raw = True
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def __init__(self, rec, args):
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station, name = args.split(None, 1)
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self.staid = station
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self.sta = getStation(station)
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self.attr = name
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self.last = None
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if name.startswith('get'):
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# Assume this is a method of pymetar.WeatherReport
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self.allowScan = self.sta.scan.add
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self.process = self.process_report
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else:
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# Our own internal info
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self.allowScan = self.sta.intscan.add
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self.process = getattr(self, name)
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try:
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rec.UDF = 0
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except AttributeError:
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pass
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def detach(self, rec):
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pass
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def showID(self, rec, report):
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rec.VAL = self.staid
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def updatePeriod(self, rec, report):
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rec.VAL = self.sta.updatePeriod/60.0
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def process_report(self, rec, report):
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if report is not None:
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self.last = report
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else:
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report = self.last
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if report is None:
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rec.setSevr()
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return
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fn = getattr(self.last, self.attr)
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newval = fn()
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try:
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rec.VAL = newval
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except ValueError:
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rec.setSevr()
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try:
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rec.UDF = 0
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except AttributeError:
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pass
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if rec.TSE==-2:
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rec.setTime(report._updatetime)
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build = DataWatcher
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class ReportScanner(StoppableThread):
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"""Driver thread which occasionally polls for new metar data
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"""
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def __init__(self, station):
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self.io = pymetar.ReportFetcher()
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self.station = station
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self.initPeriod = self.updatePeriod = 15*60.0
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self.minPeriod = 10*60.0
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self.maxPeriod = 2*60*60.0
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self.lastUpdate = None # Time of last report
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self.scan = IOScanListBlock() # I/O Intr scan for report data
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self.intscan = IOScanListBlock() # scan for internal info
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super(ReportScanner,self).__init__()
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addHook('AfterIocRunning', self.start)
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addHook('AtIocExit', self.join)
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def run(self):
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print("Starting scanner for ",self.station)
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while self.shouldRun():
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try:
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report = self.io.FetchReport(self.station)
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pymetar.ReportParser().ParseReport(report)
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rtime = iso2sec(report.getISOTime())
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report._updatetime = rtime
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#print('update',report.getISOTime(),rtime,self.lastUpdate)
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if self.lastUpdate is not None:
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if self.lastUpdate >= rtime:
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#print('No update, Wait a little longer next time')
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self.updatePeriod = self.initPeriod
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else: # self.lastUpdate < rtime
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#print('Got an update')
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self.updatePeriod = rtime - self.lastUpdate
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self.updatePeriod = max(self.minPeriod, min(self.updatePeriod, self.maxPeriod))
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self.updatePeriod += 15*60.0
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self.scan.interrupt(reason=report)
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else:
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self.scan.interrupt(reason=report)
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self.lastUpdate = rtime
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except Exception as e:
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print("download error for",self.station,":",e)
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self.updatePeriod = self.initPeriod
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self.intscan.interrupt()
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#print('Waiting',self.updatePeriod)
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self.sleep(self.updatePeriod)
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print('Done')
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