56 lines
2.4 KiB
Python
56 lines
2.4 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 in an inv message, or advertise a peer to other
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# peers in an addr message. Instead of sending them 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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size = 10
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def __init__(self, sendDataThreadMailbox):
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threading.Thread.__init__(self, name="objectHashHolder")
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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.collectionOfHashLists = []
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self.collectionOfPeerLists = []
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for i in range(objectHashHolder.size):
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self.collectionOfHashLists.append([])
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self.collectionOfPeerLists.append([])
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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.collectionOfHashLists[iterator]) > 0:
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self.sendDataThreadMailbox.put((0, 'sendinv', self.collectionOfHashLists[iterator]))
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self.collectionOfHashLists[iterator] = []
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if len(self.collectionOfPeerLists[iterator]) > 0:
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self.sendDataThreadMailbox.put((0, 'sendaddr', self.collectionOfPeerLists[iterator]))
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self.collectionOfPeerLists[iterator] = []
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iterator += 1
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iterator %= objectHashHolder.size
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time.sleep(1)
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def holdHash(self,hash):
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self.collectionOfHashLists[random.randrange(0, objectHashHolder.size)].append(hash)
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def hasHash(self, hash):
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if hash in (hashlist for hashlist in self.collectionOfHashLists):
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logger.debug("Hash in hashHolder")
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return True
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return False
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def holdPeer(self,peerDetails):
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self.collectionOfPeerLists[random.randrange(0, objectHashHolder.size)].append(peerDetails)
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def hashCount(self):
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return sum([len(x) for x in self.collectionOfHashLists if type(x) is list])
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def close(self):
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self.shutdown = True
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