def get_meter_statistics(self, event_filter):
"""Return a dictionary containing meter statistics.
described by the query parameters.
The filter must have a meter value set.
{ 'min':
'max':
'avg':
'sum':
'count':
'duration':
'duration_start':
'duration_end':
}
"""
query = self.session.query(func.min(Meter.timestamp),
func.max(Meter.timestamp),
func.sum(Meter.counter_volume),
func.min(Meter.counter_volume),
func.max(Meter.counter_volume),
func.count(Meter.counter_volume))
query = make_query_from_filter(query, event_filter)
results = query.all()
res = results[0]
count = int(res[5])
return {'count': count,
'min': res[3],
'max': res[4],
'avg': (res[2] / count) if count > 0 else None,
'sum': res[2],
'duration': None,
'duration_start': res[0],
'duration_end': res[1],
}
def get_event_interval(self, event_filter):
"""Return the min and max timestamps from events,
using the event_filter to limit the events seen.
( datetime.datetime(), datetime.datetime() )
"""
query = self.session.query(func.min(Meter.timestamp),
func.max(Meter.timestamp))
query = make_query_from_filter(query, event_filter)
results = query.all()
a_min, a_max = results[0]
return (a_min, a_max)
def get_volume_max(self, event_filter):
counter_volume_func = func.max(Meter.counter_volume)
query = self._make_volume_query(event_filter, counter_volume_func)
results = query.all()
return ({'resource_id': x, 'value': y} for x, y in results)