PyBitmessage-2021-04-27/src/network/downloadthread.py

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import threading
import time
import addresses
#from bmconfigparser import BMConfigParser
from debug import logger
from helper_threading import StoppableThread
#from inventory import Inventory
from network.connectionpool import BMConnectionPool
import protocol
class DownloadThread(threading.Thread, StoppableThread):
maxPending = 50
requestChunk = 100
requestTimeout = 60
cleanInterval = 60
requestExpires = 600
def __init__(self):
threading.Thread.__init__(self, name="DownloadThread")
self.initStop()
self.name = "DownloadThread"
logger.info("init download thread")
self.pending = {}
self.lastCleaned = time.time()
def cleanPending(self):
deadline = time.time() - DownloadThread.requestExpires
self.pending = {k: v for k, v in self.pending.iteritems() if v >= deadline}
self.lastCleaned = time.time()
def run(self):
while not self._stopped:
requested = 0
for i in BMConnectionPool().inboundConnections.values() + BMConnectionPool().outboundConnections.values():
now = time.time()
timedOut = now - DownloadThread.requestTimeout
# this may take a while, but it needs a consistency so I think it's better to lock a bigger chunk
with i.objectsNewToMeLock:
downloadPending = len(list((k for k, v in i.objectsNewToMe.iteritems() if k in self.pending and self.pending[k] > timedOut)))
if downloadPending >= DownloadThread.maxPending:
continue
# keys with True values in the dict
request = list((k for k, v in i.objectsNewToMe.iteritems() if k not in self.pending or self.pending[k] < timedOut))
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if not request:
continue
if len(request) > DownloadThread.requestChunk - downloadPending:
request = request[:DownloadThread.requestChunk - downloadPending]
# mark them as pending
for k in request:
i.objectsNewToMe[k] = False
self.pending[k] = now
payload = addresses.encodeVarint(len(request)) + ''.join(request)
i.writeQueue.put(protocol.CreatePacket('getdata', payload))
logger.debug("%s:%i Requesting %i objects", i.destination.host, i.destination.port, len(request))
requested += len(request)
if time.time() >= self.lastCleaned + DownloadThread.cleanInterval:
self.cleanPending()
if not requested:
self.stop.wait(1)