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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
# Written by Bram Cohen
from BitTorrent.platform import bttime
class Measure(object):
def __init__(self, max_rate_period, fudge=5):
self.max_rate_period = max_rate_period
self.ratesince = bttime() - fudge
self.last = self.ratesince
self.rate = 0.0
self.total = 0
def update_rate(self, amount):
self.total += amount
t = bttime()
self.rate = (self.rate * (self.last - self.ratesince) +
amount) / (t - self.ratesince)
self.last = t
if self.ratesince < t - self.max_rate_period:
self.ratesince = t - self.max_rate_period
def get_rate(self):
self.update_rate(0)
return self.rate
def get_rate_noupdate(self):
return self.rate
def time_until_rate(self, newrate):
if self.rate <= newrate:
return 0
t = bttime() - self.ratesince
return ((self.rate * t) / newrate) - t
def get_total(self):
return self.total
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