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Miner.py
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Miner.py
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from utils import *
import requests
import random
import threading
import time
class Miner(Wallet):
def __init__(self,name,ip,port,pool='normal',role='normal'):
Wallet.__init__(self,name,ip,port,pool,'miner')
self.blockchain = Blockchain.new(self)
self.t_lock = threading.Lock()
self.t_block = threading.Lock()
self.status = 'normal'
self.role = role
self.block_queue = []
def mine(self):
bc = self.blockchain
last_block = bc.last_block
balance = bc.balance[last_block.hash].copy()
prev_block = last_block
prev_t = []
while prev_block.header['previous_hash']:
prev_t.extend(prev_block.transactions.get_list())
prev_block = bc.chain[prev_block.header['previous_hash']]
prev_t = set(prev_t)
m = MerkleTree.build()
self.t_lock.acquire()
bc_transactions = bc.transactions
bc.transactions = []
self.t_lock.release()
for t in bc_transactions:
# validate transaction
f_b = balance.get(t.sender,0)-t.amount
if t.serialize() in prev_t:
print('{} ignored {}: transaction already exists in blockchain'.format(self,t))
continue
if f_b>=0 and t.validate():
balance[t.sender] = f_b
m.add(t)
else:
print('{} ignore {}: not enough balance'.format(self,t))
# add reward
reward = Transaction.new(Blockchain.public,self.public,100)
reward.sign(Blockchain.private)
m.add(reward)
block = Block.new(last_block.header['depth']+1,last_block.hash,m.root.hash,bc.target,m)
pow = block.proof_of_work(self)
if not pow:
return False
print('{} found {}'.format(self,block))
bc.addBlock(block)
# broadcast the new block
for contact in self.contacts['miner']+self.contacts['spv']:
requests.post('{}/add_block'.format(contact['address']), json={"block": block.serialize()})
return True
def selfish_mine(self):
bc = self.blockchain
last_block = bc.private_block
balance = bc.balance[last_block.hash].copy()
prev_block = last_block
prev_t = []
while prev_block.header['previous_hash']:
prev_t.extend(prev_block.transactions.get_list())
prev_block = bc.chain[prev_block.header['previous_hash']]
prev_t = set(prev_t)
m = MerkleTree.build()
self.t_lock.acquire()
bc_transactions = bc.transactions
bc.transactions = []
self.t_lock.release()
for t in bc_transactions:
# validate transaction
f_b = balance.get(t.sender,0)-t.amount
if t.serialize() in prev_t:
print('{} ignored {}: transaction already exists in blockchain'.format(self,t))
continue
if f_b>=0 and t.validate():
balance[t.sender] = f_b
m.add(t)
else:
print('{} ignore {}: not enough balance'.format(self,t))
# add reward
reward = Transaction.new(Blockchain.public,self.public,100)
reward.sign(Blockchain.private)
m.add(reward)
block = Block.new(last_block.header['depth']+1,last_block.hash,m.root.hash,bc.target,m)
pow = block.proof_of_work(self,True)
if not pow:
return False
print('{} secretly found {}'.format(self,block))
bc.addBlock(block,True)
self.t_block.acquire()
self.block_queue.append(block)
self.t_block.release()
# broadcast the new block to pool
for contact in self.contacts['miner']+self.contacts['spv']:
if contact['pool'] == self.pool:
requests.post('{}/add_block'.format(contact['address']), json={"block": block.serialize(),"pool":self.pool})
return True
def fork(self,block):
bc = self.blockchain
last_block = bc.chain[block.hash]
balance = bc.balance[last_block.hash].copy()
prev_block = last_block
prev_t = []
while prev_block.header['previous_hash']:
prev_t.extend(prev_block.transactions.get_list())
prev_block = bc.chain[prev_block.header['previous_hash']]
prev_t = set(prev_t)
m = MerkleTree.build()
self.t_lock.acquire()
bc_transactions = bc.transactions
bc.transactions = []
self.t_lock.release()
for t in bc_transactions:
# validate transaction
f_b = balance.get(t.sender,0)-t.amount
if t.serialize() in prev_t:
print('{} ignored {}: transaction already exists in blockchain'.format(self,t))
continue
if f_b>=0 and t.validate():
balance[t.sender] = f_b
m.add(t)
else:
print('{} ignore {}: not enough balance'.format(self,t))
# add reward
reward = Transaction.new(Blockchain.public,self.public,100)
reward.sign(Blockchain.private)
m.add(reward)
block = Block.new(last_block.header['depth']+1,last_block.hash,m.root.hash,bc.target,m)
pow = block.proof_of_work(self)
if not pow:
return False
print('{} fork {}'.format(self,block))
bc.addBlock(block,True)
# broadcast the new block
for contact in self.contacts['miner']+self.contacts['spv']:
requests.post('{}/add_block'.format(contact['address']), json={"block": block.serialize(),"pool":self.pool})
return True
def get_proof(self,transaction):
bc = self.blockchain
prev_block = bc.last_block
serialized_transaction = transaction.serialize()
while prev_block.header['previous_hash']:
if serialized_transaction in prev_block.transactions.get_list():
return prev_block.hash, prev_block.transactions.get_proof(transaction)
prev_block = bc.chain[prev_block.header['previous_hash']]
return False
def verify_proof(self,transaction,block_hash,proof):
bc = self.blockchain
prev_block = bc.last_block
while prev_block.header['previous_hash']:
if block_hash == prev_block.hash:
boolean = prev_block.verify_transaction(transaction,proof)
is_in = '' if boolean else ' not'
print('{}: {} is{} in blockchain, {}'.format(self.name,transaction,is_in,prev_block))
return boolean
prev_block = bc.chain[prev_block.header['previous_hash']]
print('{}: {} is not in blockchain'.format(self,transaction))
return False
def get_balance(self):
bc = self.blockchain
return bc.balance[bc.last_block.hash]
def addBlock(self,block,private=False):
if self.role == 'main attacker' and private == True:
self.t_block.acquire()
self.block_queue.append(block)
self.t_block.release()
self.blockchain.addBlock(block,private)
def addTransaction(self,transaction):
self.t_lock.acquire()
self.blockchain.addTransaction(transaction)
self.t_lock.release()
def transfer(self,receiver,amount):
transaction = Transaction.new(self.public,receiver['public'],amount)
transaction.sign(self.private)
print('{} send {} to ({}..) -> {}'.format(self,amount,receiver['public'][:6],transaction))
self.blockchain.addTransaction(transaction)
for miner in self.contacts['miner']:
requests.post('{}/add_transaction'.format(miner['address']), json={"transaction": transaction.serialize()})
requests.post('{}/receive_transaction'.format(receiver['address']), json={"transaction": transaction.serialize()})
return transaction
def double_spending_attack(self):
if self.role == 'main attacker':
while True:
for i in range(1):
self.mine()
self.blockchain.private_block = self.blockchain.last_block
victim = random.choice([c for c in self.contacts['miner']+self.contacts['spv'] if c['pool'] != self.pool])
transaction = self.transfer(victim,0)
attack_when = self.blockchain.private_block.header['depth']+2
print('### {} launch double spending attack on {} ###'.format(self,transaction))
while self.blockchain.last_block.header['depth'] <= attack_when:
time.sleep(1)
for contact in self.contacts['miner']:
if contact['pool'] == self.pool:
requests.post('{}/set_status'.format(contact['address']), json={"status": "attack"})
self.status = 'attack'
while self.blockchain.last_block.header['depth'] != self.blockchain.private_block.header['depth']:
self.fork(self.blockchain.private_block)
# self.fork(self.las)
self.status = 'normal'
for contact in self.contacts['miner']:
if contact['pool'] == self.pool:
requests.post('{}/set_status'.format(contact['address']), json={"status": "normal"})
proof = self.get_proof(transaction)
if proof == False:
print('{}: {} is not in blockchain'.format(self,transaction))
else:
print('{}: {} is in blockchain'.format(self,transaction))
print('### {}: Attack on {} succeed ###'.format(self,transaction))
else:
while True:
if self.status == 'attack':
self.fork(self.blockchain.private_block)
else:
self.mine()
def reveal(self):
if len(self.block_queue) == 0:
return False
for block in self.block_queue:
print('{} revealed {}'.format(self,block))
for contact in self.contacts['miner']+self.contacts['spv']:
if contact['pool'] != self.pool:
requests.post('{}/add_block'.format(contact['address']), json={"block": block.serialize(),"pool":self.pool})
self.t_block.acquire()
self.block_queue = []
self.t_block.release()
return True
def selfish_mining_attack(self):
# pass
print('### {} launch selfish mining attack ###'.format(self))
self.status = 'attack'
p_computing_power = (1+len([c for c in self.contacts['miner'] if c['pool']==self.pool]))*100/(1+len(self.contacts['miner']))
print('pool computing power: {:.2f}%'.format(p_computing_power))
if self.role == 'main attacker':
# if True:
reward = 0
while True:
if self.blockchain.private_block.header['depth']>self.blockchain.last_block.header['depth']:
if reward >= 2:
self.reveal()
self.selfish_mine()
elif self.blockchain.private_block.header['depth']==self.blockchain.last_block.header['depth']:
self.reveal()
reward += 1 if self.selfish_mine() else 0
else:
reward = 0
self.blockchain.private_block = self.blockchain.last_block
reward += 1 if self.selfish_mine() else 0
hash = self.blockchain.last_block.hash
p_total_money = sum([self.blockchain.balance[hash].get(c['public'],0) for c in self.contacts['miner'] if c['pool']==self.pool])+self.blockchain.balance[hash].get(self.public,0)
total_money = sum(self.blockchain.balance[hash].values())
if total_money != 0:
p_money = p_total_money*100/total_money
print('Attackers computing power: {:.2f}%, attackers reward: {:.2f}%'.format(p_computing_power,p_money))
else:
while True:
self.selfish_mine()
def normal(self):
while True:
self.mine()
if len(self.contacts['spv']) != 0 and random.random()<0.8:
contact = random.choice(self.contacts['spv'])
self.transfer(contact,random.randint(10,30))
def run(self,mode):
if mode == 'normal':
self.normal()
elif mode == 'double spending attack':
self.double_spending_attack()
elif mode == 'selfish mining attack':
self.selfish_mining_attack()
def __str__(self):
return "Miner({}|{}..)".format(self.name,self.public[:6])