def send_transaction():
log_ip(request, inspect.stack()[0][3])
data = request.json
transaction = Transaction.from_json(data["transaction"]).object()
sig = data["signature"]
transaction.add_sign(sig)
logger.debug(transaction)
logger.info("Wallet: Attempting to Send Transaction")
try:
r = requests.post(
"http://0.0.0.0:" + str(consts.MINER_SERVER_PORT) +
"/newtransaction",
data=compress(transaction.to_json()),
timeout=(5, 1),
)
if r.status_code == 400:
response.status = 400
logger.error(
"Wallet: Could not Send Transaction. Invalid transaction: " +
r.text)
return "Invalid Transaction: " + r.text
except Exception as e:
response.status = 400
logger.error("Wallet: Could not Send Transaction. Try Again." + str(e))
return "Internal error, try again"
else:
logger.info("Wallet: Transaction Sent, Wait for it to be Mined")
return "Done"
def create_transaction(receiver_public_keys: List[str],
amounts: List[int],
sender_public_key,
message="") -> Transaction:
vout = {}
vin = {}
current_amount = 0
total_amount = sum(amounts)
i = 0
for so, utxo_list in BLOCKCHAIN.active_chain.utxo.utxo.items():
tx_out = utxo_list[0]
if current_amount >= total_amount:
break
if tx_out.address == sender_public_key:
current_amount += tx_out.amount
vin[i] = TxIn(payout=SingleOutput.from_json(so),
pub_key=sender_public_key,
sig="")
i += 1
for i, address in enumerate(receiver_public_keys):
vout[i] = TxOut(amount=amounts[i], address=address)
change = (current_amount - total_amount)
if change > 0:
vout[i + 1] = TxOut(amount=change, address=sender_public_key)
tx = Transaction(version=consts.MINER_VERSION,
locktime=0,
timestamp=int(time.time()),
vin=vin,
vout=vout,
message=message)
return tx
def process_new_transaction(request_data: bytes) -> str:
global BLOCKCHAIN
transaction_json = decompress(request_data)
if transaction_json:
try:
tx = Transaction.from_json(transaction_json).object()
# Add transaction to Mempool
if tx not in BLOCKCHAIN.mempool:
if BLOCKCHAIN.active_chain.is_transaction_valid(tx):
logger.debug(
"Valid Transaction received, Adding to Mempool")
BLOCKCHAIN.mempool.add(tx)
# Broadcast block to other peers
send_to_all_peers("/newtransaction", request_data)
else:
return "Transaction Already received"
else:
logger.debug(
"The transation is not valid, not added to Mempool")
return "Not Valid Transaction"
except Exception as e:
logger.error("Server: New Transaction: Invalid tx received: " +
str(e))
raise e
return "Not Valid Transaction"
return "Done"
def __mine(self, mempool: Set[Transaction], chain: Chain,
payout_addr: str) -> Block:
c_pool = list(copy.deepcopy(mempool))
mlist, fees = self.__calculate_best_transactions(c_pool)
# logger.debug(f"Miner: Will mine {len(mlist)} transactions and get {fees} scoins in fees")
coinbase_tx_in = {
0:
TxIn(payout=None,
sig="Receiving some Money",
pub_key="Does it matter?")
}
coinbase_tx_out = {
0: TxOut(amount=chain.current_block_reward(), address=payout_addr),
1: TxOut(amount=fees, address=payout_addr),
}
coinbase_tx = Transaction(
is_coinbase=True,
version=consts.MINER_VERSION,
fees=0,
timestamp=int(time.time()),
locktime=-1,
vin=coinbase_tx_in,
vout=coinbase_tx_out,
)
mlist.insert(0, coinbase_tx)
block_header = BlockHeader(
version=consts.MINER_VERSION,
height=chain.length,
prev_block_hash=dhash(chain.header_list[-1]),
merkle_root=merkle_hash(mlist),
timestamp=int(time.time()),
target_difficulty=chain.target_difficulty,
nonce=0,
)
DONE = False
for n in range(2**64):
block_header.nonce = n
bhash = dhash(block_header)
if chain.is_proper_difficulty(bhash):
block = Block(header=block_header, transactions=mlist)
requests.post("http://0.0.0.0:" +
str(consts.MINER_SERVER_PORT) + "/newblock",
data=compress(block.to_json()))
logger.info(
f"Miner: Mined Block with {len(mlist)} transactions, Got {fees} in fees and {chain.current_block_reward()} as reward"
)
DONE = True
break
if not DONE:
logger.error(
"Miner: Exhausted all 2 ** 64 values without finding proper hash"
)
def calculate_transaction_fees(tx: Transaction, w: Wallet, bounty: int,
fees: int):
current_amount = 0
i = 0
for so, utxo_list in BLOCKCHAIN.active_chain.utxo.utxo.items():
tx_out = utxo_list[0]
if utxo_list[2]:
# check for coinbase TxIn Maturity
if not (BLOCKCHAIN.active_chain.length -
utxo_list[1].height) >= consts.COINBASE_MATURITY:
continue
if current_amount >= bounty + fees:
break
if tx_out.address == w.public_key:
current_amount += tx_out.amount
tx.vin[i] = TxIn(payout=SingleOutput.from_json(so),
pub_key=w.public_key,
sig="")
i += 1
tx.vout[1].amount = current_amount - bounty - fees
tx.fees = fees
tx.sign(w)
def send_bounty(bounty: int, receiver_public_key: str, fees: int):
current_balance = check_balance()
if current_balance < bounty + fees:
print("Insuficient balance ")
print("Current balance : " + str(current_balance))
print("You need " + str(current_balance - bounty) + "more money")
else:
transaction = Transaction(
version=1,
locktime=0,
timestamp=2,
is_coinbase=False,
fees=0,
vin={},
vout={
0: TxOut(amount=bounty, address=receiver_public_key),
1: TxOut(amount=0, address=MY_WALLET.public_key)
},
)
calculate_transaction_fees(transaction, MY_WALLET, bounty, fees)
logger.debug(transaction)
logger.info("Wallet: Attempting to Send Transaction")
try:
requests.post(
"http://0.0.0.0:" + str(consts.MINER_SERVER_PORT) +
"/newtransaction",
data=compress(transaction.to_json()),
timeout=(5, 1),
)
except Exception as e:
logger.error("Wallet: Could not Send Transaction. Try Again." +
str(e))
else:
logger.info("Wallet: Transaction Sent, Wait for it to be Mined")
def send_amount(self, receiver_address: str, amount: int, message: Optional[str]) -> bool:
contract_private_key = int(self.current_contract_priv_key)
contract_wallet = Wallet(pub_key=None, priv_key=contract_private_key)
data = {
'bounty': amount,
'sender_public_key': contract_wallet.public_key,
'receiver_public_key': receiver_address,
'message': message
}
r = requests.post("http://0.0.0.0:" + str(consts.MINER_SERVER_PORT) + "/makeTransaction", json=data)
tx_data = r.json()
logger.debug(f"BlockchainVmInterface: send_amount - Make Transaction returned: {tx_data}")
transaction = Transaction.from_json(tx_data['send_this']).object()
signed_string = contract_wallet.sign(tx_data['sign_this'])
transaction.add_sign(signed_string)
return self.add_contract_tx_to_mempool(transaction)
def update_contract_output(self, output: str) -> bool:
contract_private_key = int(self.current_contract_priv_key)
contract_wallet = Wallet(pub_key=None, priv_key=contract_private_key)
contract_address = contract_wallet.public_key
cc, _, cp = get_cc_co_cp_by_contract_address(contract_address)
if cp != str(contract_private_key):
# We should panic
logger.error(f"Contract private keys do not match for address {contract_address}")
return False
if cc == '':
logger.error(f"Contract code is empty for address {contract_address}")
return False
cpub = contract_address
data = {
'bounty': 1,
'sender_public_key': contract_wallet.public_key,
'receiver_public_key': 'AAAAA' + cpub[5:], # Some random address
'message': "Updated output of the tx", # Possibly add the prev tx_hash here
'contract_code': cc
}
r = requests.post("http://0.0.0.0:" + str(consts.MINER_SERVER_PORT) + "/makeTransaction", json=data)
logger.debug(f"BlockchainVmInterface: update_contract_output - Make Transaction returned: {r.text}")
res = r.json()['send_this']
tx_data = json.loads(res)
tx_data['contract_output'] = output
tx_data['contract_priv_key'] = cp
tx_data['data'] = "" # Leaving it empty
tx_data['timestamp'] = int(time.time())
for num in tx_data['vout']:
tx_data['vout'][num]["address"] = cpub
transaction = Transaction.from_json(json.dumps(tx_data)).object()
tx_vin = transaction.vin
transaction.vin = {}
transaction.contract_output = None
tx_json_to_sign = transaction.to_json()
signed_string = contract_wallet.sign(tx_json_to_sign)
transaction.vin = tx_vin
transaction.contract_output = output
transaction.add_sign(signed_string)
return self.add_contract_tx_to_mempool(transaction)
def process_new_transaction(request_data: bytes) -> Tuple[bool, str]:
global BLOCKCHAIN
transaction_json = decompress(request_data)
if transaction_json:
try:
tx = Transaction.from_json(transaction_json).object()
# Validations
for txIn in tx.vin.values():
if is_valid_contract_address(txIn.pub_key):
return False, "Cannot send funds from a contract address"
if tx.contract_output is not None:
return False, "Contract Output should be None"
if tx.contract_code != "": # This is a contract
contract_address = tx.get_contract_address()
# Ensure that there is no other contract on this contract address
cc, _, _ = get_cc_co_cp_by_contract_address(contract_address)
if cc != "":
return False, "There is already some other contract at this contract address"
# Add transaction to Mempool
if tx not in BLOCKCHAIN.mempool:
ok, msg = BLOCKCHAIN.active_chain.is_transaction_valid(tx)
if ok:
logger.debug(
"Valid Transaction received, Adding to Mempool")
BLOCKCHAIN.mempool.add(tx)
logger.debug(
f"Mempool now contains {len(BLOCKCHAIN.mempool)} transaction(s)"
)
# Broadcast block to other peers
send_to_all_peers("/newtransaction", request_data)
else:
logger.debug(
"The transation is not valid, not added to Mempool - "
+ msg)
return False, "Not Valid Transaction: " + msg
else:
return True, "Transaction Already received"
except Exception as e:
logger.error("Server: New Transaction: Invalid tx received: " +
str(e))
return False, "Not Valid Transaction"
return True, "Done"
def get_peer_url(peer: Dict[str, Any]) -> str:
return "http://" + str(peer["ip"]) + ":" + str(peer["port"])
if __name__ == "__main__":
# The singleOutput for first coinbase transaction in genesis block
so = SingleOutput(txid=dhash(first_block_transaction[0]), vout=0)
first_transaction = Transaction(
version=1,
locktime=0,
timestamp=3,
is_coinbase=False,
fees=4000000000,
vin={0: TxIn(payout=so, sig="", pub_key=consts.WALLET_PUBLIC)},
vout={0: TxOut(amount=1000000000, address=consts.WALLET_PUBLIC)}
)
sign_copy_of_tx = copy.deepcopy(first_transaction)
sign_copy_of_tx.vin = {}
w = Wallet()
w.public_key = consts.WALLET_PUBLIC
w.private_key = consts.WALLET_PRIVATE
sig = w.sign(sign_copy_of_tx.to_json())
first_transaction.vin[0].sig = sig
peer_list = fetch_peer_list()
print(peer_list)
for i in range(peer_height, ACTIVE_CHAIN.length):
hash_list.append(dhash(ACTIVE_CHAIN.header_list[i]))
logger.debug(peer_height)
return jsonify(hash_list)
# The singleOutput for first coinbase transaction in genesis block
so = SingleOutput(txid=dhash(genesis_block_transaction[0]), vout=0)
first_block_transactions = [
Transaction(
version=1,
locktime=0,
timestamp=2,
is_coinbase=True,
fees=0,
vin={0: TxIn(payout=None, sig="", pub_key=consts.WALLET_PUBLIC)},
vout={
0: TxOut(amount=5000000000, address=consts.WALLET_PUBLIC),
1: TxOut(amount=4000000000, address=consts.WALLET_PUBLIC),
},
),
Transaction(
version=1,
locktime=0,
timestamp=3,
is_coinbase=False,
fees=4000000000,
vin={0: TxIn(payout=so, sig="", pub_key=consts.WALLET_PUBLIC)},
vout={0: TxOut(amount=1000000000, address=consts.WALLET_PUBLIC)},
),
]