Cron tool and callback skeletons

logic/cron.py

+from datetime import datetime, timedelta
+import time
+
+# Some utility classes / functions first
+class AllMatch(set):
+    """Universal set - match everything"""
+    def __contains__(self, item):
+        return True
+
+allMatch = AllMatch()
+
+# The actual Event class
+class Event(object):
+    def __init__(self, action, min=allMatch, hour=allMatch,
+                       day=allMatch, month=allMatch, dow=allMatch,
+                       args=(), kwargs={}):
+        self.mins = self._conv_to_set(min)
+        self.hours= self._conv_to_set(hour)
+        self.days = self._conv_to_set(day)
+        self.months = self._conv_to_set(month)
+        self.dow = self._conv_to_set(dow)
+        self.action = action
+        self.args = args
+        self.kwargs = kwargs
+
+    def matchtime(self, t):
+        """Return True if this event should trigger at the specified datetime"""
+        return ((t.minute     in self.mins) and
+                (t.hour       in self.hours) and
+                (t.day        in self.days) and
+                (t.month      in self.months) and
+                (t.weekday()  in self.dow))
+
+    def check(self, t):
+        if self.matchtime(t):
+            self.action(*self.args, **self.kwargs)
+
+    def _conv_to_set(self,obj):  # Allow single integer to be provided
+        if isinstance(obj, (int,long)):
+            return set([obj])  # Single item
+        if not isinstance(obj, set):
+            obj = set(obj)
+        return obj
+
+class CronTab(object):
+    def __init__(self, *events):
+        self.events = events
+
+    def run(self):
+        t=datetime(*datetime.now().timetuple()[:5])
+        while 1:
+            for e in self.events:
+                e.check(t)
+
+            t += timedelta(minutes=1)
+            n = datetime.now()
+            while n < t:
+                s = (t - n).seconds + 1
+                time.sleep(s)
+                n = datetime.now()

logic/cron_callbacks.py

+#
+# Callback functions used by the cron dispatcher.
+#
+# Copyright 2010 Greek Research and Technology Network
+#
+
+
+def send_recons_req():
+    """
+        Publish a reconsiliation request to the queue
+    """
+
+    reconcile = dict()
+    reconcile['msg'] = 'reconcile'
+
+    
+
+    pass
+
+def send_credit_calc_req():
+    """
+        Publish a credit calculation request to the queue
+    """
+    pass
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