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PyBitmessage/src/throttle.py

82 lines
2.5 KiB

import math
import threading
import time
from bmconfigparser import BMConfigParser
from singleton import Singleton
import state
class Throttle(object):
minChunkSize = 4096
maxChunkSize = 131072
def __init__(self, limit=0):
self.limit = limit
self.speed = 0
self.chunkSize = Throttle.maxChunkSize
self.txTime = int(time.time())
self.txLen = 0
self.total = 0
self.timer = threading.Event()
self.lock = threading.RLock()
self.resetChunkSize()
def recalculate(self):
with self.lock:
now = int(time.time())
if now > self.txTime:
self.speed = self.txLen / (now - self.txTime)
self.txLen -= self.limit * (now - self.txTime)
self.txTime = now
if self.txLen < 0 or self.limit == 0:
self.txLen = 0
def wait(self, dataLen):
with self.lock:
self.txLen += dataLen
self.total += dataLen
while state.shutdown == 0:
self.recalculate()
if self.limit == 0:
break
if self.txLen < self.limit:
break
self.timer.wait(0.2)
def getSpeed(self):
self.recalculate()
return self.speed
def resetChunkSize(self):
with self.lock:
# power of two smaller or equal to speed limit
try:
self.chunkSize = int(math.pow(2, int(math.log(self.limit,2))))
except ValueError:
self.chunkSize = Throttle.maxChunkSize
# range check
if self.chunkSize < Throttle.minChunkSize:
self.chunkSize = Throttle.minChunkSize
elif self.chunkSize > Throttle.maxChunkSize:
self.chunkSize = Throttle.maxChunkSize
@Singleton
class SendThrottle(Throttle):
def __init__(self):
Throttle.__init__(self, BMConfigParser().safeGetInt('bitmessagesettings', 'maxuploadrate')*1024)
def resetLimit(self):
with self.lock:
self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxuploadrate')*1024
Throttle.resetChunkSize(self)
@Singleton
class ReceiveThrottle(Throttle):
def __init__(self):
Throttle.__init__(self, BMConfigParser().safeGetInt('bitmessagesettings', 'maxdownloadrate')*1024)
def resetLimit(self):
with self.lock:
self.limit = BMConfigParser().safeGetInt('bitmessagesettings', 'maxdownloadrate')*1024
Throttle.resetChunkSize(self)