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- # The contents of this file are subject to the BitTorrent Open Source License
- # Version 1.0 (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 time import time
-
-
- class Measure(object):
-
- def __init__(self, max_rate_period, fudge=5):
- self.max_rate_period = max_rate_period
- self.ratesince = time() - fudge
- self.last = self.ratesince
- self.rate = 0.0
- self.total = 0
-
- def update_rate(self, amount):
- self.total += amount
- t = time()
- 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 = time() - self.ratesince
- return ((self.rate * t) / newrate) - t
-
- def get_total(self):
- return self.total
-