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# -*- coding: utf-8 -*-
# averages.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Utility class for moving averages.
It is used in the status panel widget for displaying up and down
download rates.
"""
from leap.bitmask.util import first
class RateMovingAverage(object):
"""
Moving window average for calculating
upload and download rates.
"""
SAMPLE_SIZE = 5
def __init__(self):
"""
Initializes an empty array of fixed size
"""
self.reset()
def reset(self):
self._data = [None for i in xrange(self.SAMPLE_SIZE)]
def append(self, x):
"""
Appends a new data point to the collection.
:param x: A tuple containing timestamp and traffic points
in the form (timestamp, traffic)
:type x: tuple
"""
self._data.pop(0)
self._data.append(x)
def get(self):
"""
Gets the collection.
"""
return self._data
def get_average(self):
"""
Gets the moving average.
"""
data = filter(None, self.get())
traff = [traffic for (ts, traffic) in data]
times = [ts for (ts, traffic) in data]
try:
deltatraffic = traff[-1] - first(traff)
deltat = (times[-1] - first(times)).seconds
except IndexError:
deltatraffic = 0
deltat = 0
try:
rate = float(deltatraffic) / float(deltat) / 1024
except ZeroDivisionError:
rate = 0
# In some cases we get negative rates
if rate < 0:
rate = 0
return rate
def get_total(self):
"""
Gets the total accumulated throughput.
"""
try:
return self._data[-1][1] / 1024
except TypeError:
return 0
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