# 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): threading.Thread.__init__(self) 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 time.sleep(1) 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