refactor the code to abstract from the weather provider

aman/com/Weather.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+import datetime
+import pytz
+import sys
+import time
+
+from datetime import datetime as dt
+from threading import Thread
+
+from aman.com.DwdCrawler import DwdCrawler
+import aman.config.Weather
+
+class Weather(Thread):
+    def __init__(self, config : aman.config.Weather.Weather):
+        Thread.__init__(self)
+        self.nextUpdate = dt.utcfromtimestamp(int(time.time()))
+        self.lastUpdateTried = None
+        self.stopThread = False
+        self.provider = None
+
+        if 'DWD' == config.Provider.upper():
+            self.provider = DwdCrawler()
+        else:
+            sys.stderr.write('Invalid or unknown weather-provider defined')
+            sys.exit(-1)
+
+        self.start()
+
+    def stop(self):
+        self.stopThread = True
+
+    def currentClock():
+        clock = dt.utcfromtimestamp(int(time.time()))
+        clock = datetime.datetime(
+            year = clock.year,
+            month = clock.month,
+            day = clock.day,
+            hour = clock.hour,
+            minute = clock.minute,
+            second = clock.second,
+            tzinfo = pytz.UTC
+        )
+        return clock
+
+    def run(self):
+        while False == self.stopThread and None != self.provider:
+            now = Weather.currentClock()
+
+            # check if an update is required
+            if None != self.provider.updateTime and self.provider.updateTime > now:
+                time.sleep(1)
+                continue
+
+            # calculate the theoretical next try for an update
+            if None != self.lastUpdateTried:
+                earliestUpdate = self.lastUpdateTried + datetime.timedelta(minutes=2)
+
+            if None == self.lastUpdateTried or self.lastUpdateTried <= now:
+                if True == self.provider.receiveWindData():
+                    self.nextUpdate = self.provider.updateTime