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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 RateMeasure(object):
def __init__(self, left):
self.start = None
self.last = None
self.rate = 0
self.remaining = None
self.left = left
self.broke = False
self.got_anything = False
def data_came_in(self, amount):
if not self.got_anything:
self.got_anything = True
self.start = bttime() - 2
self.last = self.start
self.left -= amount
return
self.update(bttime(), amount)
def data_rejected(self, amount):
self.left += amount
def get_time_left(self):
if not self.got_anything:
return None
t = bttime()
if t - self.last > 15:
self.update(t, 0)
return self.remaining
def get_size_left(self):
return self.left
def update(self, t, amount):
self.left -= amount
try:
self.rate = ((self.rate * (self.last - self.start)) + amount) / (t - self.start)
self.last = t
self.remaining = self.left / self.rate
if self.start < self.last - self.remaining:
self.start = self.last - self.remaining
except ZeroDivisionError:
self.remaining = None
if self.broke and self.last - self.start < 20:
self.start = self.last - 20
if self.last - self.start > 20:
self.broke = True
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