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2.0 KiB

# objectHashHolder is a timer-driven thread. One objectHashHolder thread is used
# by each sendDataThread. The sendDataThread uses it whenever it needs to
# advertise an object to peers in an inv message, or advertise a peer to other
# peers in an addr message. Instead of sending them out immediately, it must
# wait a random number of seconds for each connection so that different peers
# get different objects at different times. Thus an attacker who is
# connecting to many network nodes who receives a message first from Alice
# cannot be sure if Alice is the node who originated the message.
import random
import time
import threading
class objectHashHolder(threading.Thread):
def __init__(self, sendDataThreadMailbox):
self.shutdown = False
self.sendDataThreadMailbox = sendDataThreadMailbox # This queue is used to submit data back to our associated sendDataThread.
self.collectionOfHashLists = {}
self.collectionOfPeerLists = {}
for i in range(10):
self.collectionOfHashLists[i] = []
self.collectionOfPeerLists[i] = []
def run(self):
iterator = 0
while not self.shutdown:
if len(self.collectionOfHashLists[iterator]) > 0:
self.sendDataThreadMailbox.put((0, 'sendinv', self.collectionOfHashLists[iterator]))
self.collectionOfHashLists[iterator] = []
if len(self.collectionOfPeerLists[iterator]) > 0:
self.sendDataThreadMailbox.put((0, 'sendaddr', self.collectionOfPeerLists[iterator]))
self.collectionOfPeerLists[iterator] = []
iterator += 1
iterator %= 10
def holdHash(self,hash):
self.collectionOfHashLists[random.randrange(0, 10)].append(hash)
def holdPeer(self,peerDetails):
self.collectionOfPeerLists[random.randrange(0, 10)].append(peerDetails)
def close(self):
self.shutdown = True