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Miner.py
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from ecdsa import SigningKey
from binascii import hexlify
from Transaction import Transaction
from Blockchain import Blockchain
import hashlib
import random
import copy
class Miner:
def __init__(self, blockchain, id, penalty=1, selfish=False):
self.blockchain = blockchain
self.keypair = SigningKey.generate()
self.id = id+1
self.balances=[]
self.balance={}
self.penalty = penalty
self.selfish = selfish
if selfish:
self.selfishchain= Blockchain()
self.privchainlen=0
@classmethod
def new(cls, blockchain, id, penalty,selfish):
return cls(blockchain, id, penalty,selfish)
def mine(self, transactions, chain):
pk = self.get_pk()
reward = Transaction.new(pk, pk, 1, "One step closer to rule over them all.", self.keypair)
transactions=[reward]+transactions
if not self.selfish:
self.update_balance(None, self.blockchain, chain)
else:
self.update_balance(None, self.selfishchain, chain=0)
oldbalance=copy.deepcopy(self.balance)
transactions=list(filter(lambda x: self.check_balance(x), transactions))
newlist=[]
for i in transactions:
if i not in newlist:
newlist.append(i)
transactions=newlist
transactionscheck=[]
for i in transactions:
if self.check_balance(i):
self.update_balance(i)
transactionscheck.append(i)
if not self.selfish:
added = self.blockchain.add(transactionscheck, chain)
else:
added = self.selfishchain.add(transactionscheck, chain=0)
if added == False:
self.balance=copy.deepcopy(oldbalance)
return added
return added
def get_pk(self):
return hexlify(self.keypair.get_verifying_key().to_string()).decode('utf-8')
def update_balance(self, transaction, blockchain=None, chain=None):
if blockchain != None:
self.balance = {}
ini=False
for sub_list in self.balances:
if blockchain.chain[chain] in sub_list:
ini= True
self.balance= copy.deepcopy(self.balances[self.balances.index(sub_list)][sub_list.index(blockchain.chain[chain])+1])
return True
depth=blockchain.depth(chain)
if depth != 1:
block = blockchain.chain[chain]
for k in range(1, depth-1):
block = block.prev_block
for i in block.transactions:
self.update_balance(i)
block = blockchain.chain[chain]
for i in block.transactions:
self.update_balance(i)
if not ini:
self.balances.append([blockchain.chain[chain],copy.deepcopy(self.balance)])
return True
sender = transaction.sender
receiver = transaction.receiver
amount = transaction.amount
if (sender in self.balance and sender!= receiver):
self.balance[sender]-=amount
#if (sender!=receiver and sender not in self.balance):
# self.balance[sender]= -amount
print(receiver)
if receiver not in self.balance:
self.balance[receiver] = 0
if receiver in self.balance:
self.balance[receiver]+= amount
def check_balance(self, transaction):
sender = transaction.sender
receiver = transaction.receiver
amount = transaction.amount
if (sender!= receiver and sender not in self.balance):
return False
if (sender!=receiver and amount > self.balance[sender]):
return False
return True
def make_transactions(self,publist):
recRand = random.randint(0, len(publist) - 1)
sender = self.get_pk()
receiver = publist[recRand]
amount=random.randint(1, 10)
transaction = Transaction.new(sender, receiver,amount,"",self.keypair)
return transaction
def addblock(self, newblock):
found=False
newcalhash = hashlib.sha256(newblock.header_to_json().encode("utf-8")).digest()
newcalchash = hexlify(newcalhash).decode("utf-8")
if self.selfish:
self.blockchain.chain.append(self.selfishchain.chain[0])
for j in range(0, len(self.blockchain.chain)) :
if (not found):
depth = self.blockchain.depth(j)
block = self.blockchain.chain[j]
calhash = hashlib.sha256(block.header_to_json().encode("utf-8")).digest()
calchash = hexlify(calhash).decode("utf-8")
#print("Miner: {}\t{}\t{}\t{}," .format(self.get_pk()[-4:],newcalchash[-4:], newblock.prev_hash[-4:], calchash[-4:]))
if newblock.prev_hash == calchash:
self.blockchain.chain.append(block)
self.update_balance(None, self.blockchain, -1)
del self.blockchain.chain[-1]
valid_trans = True
for t in newblock.transactions:
valid_trans = valid_trans and self.check_balance(t)
if not self.check_balance(t):
print(t)
if not (valid_trans):
print(
" This block cannot be added to the chain because the transactions are not valid")
return False
newblock.prev_block = block
if self.selfish:
if j != (len(self.blockchain.chain)-1):
del self.blockchain.chain[-1]
self.blockchain.chain[j] = newblock
self.update_balance(None,self.blockchain,j)
found= True
return found
for k in range(1, depth):
if (not found):
block = block.prev_block
calhash = hashlib.sha256(block.header_to_json().encode("utf-8")).digest()
calchash = hexlify(calhash).decode("utf-8")
#print("Miner: {}\t{}\t{}\t{}," .format(self.get_pk()[-4:],newcalchash[-4:], newblock.prev_hash[-4:], calchash[-4:]))
if newblock.prev_hash == calchash:
self.blockchain.chain.append(block)
self.update_balance(None, self.blockchain, -1)
del self.blockchain.chain[-1]
valid_trans = True
for t in newblock.transactions:
valid_trans = valid_trans and self.check_balance(t)
if not self.check_balance(t):
print(t)
if not (valid_trans):
print(
" This block cannot be added to the chain because the transactions are not valid")
return False
newblock.prev_block = block
if self.selfish:
del self.blockchain.chain[-1]
self.blockchain.chain.append(newblock)
self.update_balance(None,self.blockchain,j)
found= True
return found
if (not found):
if self.selfish:
del self.blockchain.chain[-1]
print("For miner{}, This block: {} cannot be added to the chain at this moment, because it previous hash{} does not link to any known chains.".format(self.get_pk()[-4:],newcalchash[-4:], newblock.prev_hash[-4:]))
return False
def t_already_there(self,transaction):
t= transaction.to_json()
found=False
if self.selfish:
self.blockchain.chain.append(self.selfishchain.chain[0])
for j in range(0, len(self.blockchain.chain)) :
if (not found):
depth = self.blockchain.depth(j)
block = self.blockchain.chain[j]
if transaction in block.transactions:
found=True
for k in range(1, depth):
if (not found):
block = block.prev_block
if transaction in block.transactions:
found=True
if self.selfish:
del self.blockchain.chain[-1]
return found