Shon testing.

shon.py

# shon.py - Shon test for Graphite debugging...

def eval_graphite_data(data, seconds):
    """Get the most recent correct value from the data"""
    _name = "eval_graphite_data"
    print _name, '           DATA:', data
    print _name, '        SECONDS:', seconds

    sample_period = int(data.split('|')[0].split(',')[-1])
    all_data_points = data.split('|')[-1].split(',')
    print _name, '  SAMPLE_PERIOD:', sample_period
    print _name, 'ALL_DATA_POINTS:', all_data_points

    # Evaluate what graphite returned, should either be a float, or None
    # First, if the number of seconds of data we want to examine is smaller or
    # equals the graphite sample period, just grab the latest data point.
    # If that data point is None, grab the one before it.
    # If that is None too, return 0.0.
    if seconds <= sample_period:
        if eval(all_data_points[-1]):
            print '1st: check1'
            data_value = float(all_data_points[-1])
        elif eval(all_data_points[-2]):
            print '1st: check2'
            data_value = float(all_data_points[-2])
        else:
            print '1st: check3 (default)'
            data_value = 0.0
        print _name, '1st: DATA_VALUE:', data_value
    else:
    # Second, if we requested more than on graphite sample period, work out how
    # many sample periods we wanted (python always rounds division *down*)
        data_points = (seconds/sample_period)
        print _name, '    DATA_POINTS:', data_points
        data_set = [ float(x) for x in all_data_points[-data_points:]
                     if eval(x) ]
        print _name, '       DATA_SET:', data_set
        if data_set:
            print '2nd: check1'
            data_value = float( sum(data_set) / len(data_set) )
        else:
            print '2nd: check2 (default)'
            data_value = 0.0
        print _name, '2nd: DATA_VALUE:', data_value
    return data_value

if __name__ == '__main__':
    #data = 'dropPercent,1360860120,1360860420,60|0.0,0.0,0.0,0.0,0.0'
    #seconds = 60
    data = 'dropPercent,1360860120,1360860420,60|1.0,0.0,2.0,0.0,0.0'
    seconds = 300
    
    retval = eval_graphite_data(data, seconds)
    print 'RESULT:', retval


# Output
"""
eval_graphite_data            DATA: dropPercent,1360860120,1360860420,60|0.0,0.0,0.0,0.0,0.0
eval_graphite_data         SECONDS: 60
eval_graphite_data   SAMPLE_PERIOD: 60
eval_graphite_data ALL_DATA_POINTS: ['0.0', '0.0', '0.0', '0.0', '0.0']
eval_graphite_data 1st: DATA_VALUE: 0.0
RESULT: 0.0
"""