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