class Blockchain:
def __init__(self):
self.proxy = Proxy('http://*****:*****@blockchain.infnote.com:8962')
@staticmethod
def deserialize_transaction(raw_tx):
return CTransaction.deserialize(unhexlify(raw_tx.encode('utf8')))
def decode_transaction(self, tx):
contents = []
for out in tx.vout:
if out.nValue > 0:
continue
data = self.get_data_from_vout(out)
if data:
contents.append(data)
return contents
def send_transaction(self, raw_tx):
transaction = self.deserialize_transaction(raw_tx)
txid = self.proxy.sendrawtransaction(transaction)
return txid
@staticmethod
def get_data_from_vout(vout):
i = iter(vout.scriptPubKey)
flag = next(i)
# TODO: 需要区分类型，以填充至不同的模型
if flag == script.OP_RETURN or flag == script.OP_NOP8:
data = next(i).decode('utf8')
return json.loads(data)
return None
def get_transaction(self, txid):
return self.proxy.getrawtransaction(txid)
def get_block_count(self):
return self.proxy.getblockcount()
def get_block_by_height(self, height: int):
return self.proxy.getblock(self.proxy.getblockhash(height))
def server_unspent(self):
return self.proxy.listunspent()
@staticmethod
def freeze_coins_in_tx(tx: CTransaction):
for vin in tx.vin:
coin = Coin.objects.get(txid=b2lx(vin.prevout.hash),
vout=vin.prevout.n)
coin.frozen = True
coin.save()
def send_coin_to(self, address, coin: Coin):
txin = CMutableTxIn(COutPoint(lx(coin.txid), coin.vout))
txout = CMutableTxOut(coin.value - 1e5,
CBitcoinAddress(address).to_scriptPubKey())
tx = CMutableTransaction([txin], [txout])
tx = self.proxy.signrawtransaction(tx)['tx']
# sig_hash = SignatureHash(txin_script_pubkey, tx, 0, SIGHASH_ALL)
# sig = seckey.sign(sig_hash) + bytes([SIGHASH_ALL])
# txin.scriptSig = CScript([sig, seckey.pub])
# VerifyScript(txin.scriptSig, txin_script_pubkey, tx, 0, (SCRIPT_VERIFY_P2SH,))
# print(b2x(tx.serialize()))
self.proxy.sendrawtransaction(tx)
coin.frozen = True
coin.save()
def issue_op_return(conf, op_return_bstring):
print('\nConfigured values are:\n')
print('working_directory:\t{}'.format(conf.working_directory))
print('issuing_address:\t{}'.format(conf.issuing_address))
print('full_node_url:\t\t{}'.format(conf.full_node_url))
print('full_node_rpc_user:\t{}'.format(conf.full_node_rpc_user))
print('testnet:\t\t{}'.format(conf.testnet))
print('tx_fee_per_byte:\t{}'.format(conf.tx_fee_per_byte))
print('Bytes for OP_RETURN:\n{}'.format(op_return_bstring))
print('Hex for OP_RETURN:\n{}'.format(binascii.hexlify(op_return_bstring)))
op_return_cert_protocol = op_return_bstring
consent = input('Do you want to continue? [y/N]: ').lower() in ('y', 'yes')
if not consent:
sys.exit()
full_node_rpc_password = getpass.getpass(
'\nPlease enter the password for the node\'s RPC user: '******'testnet')
else:
SelectParams('mainnet')
proxy = Proxy("http://{0}:{1}@{2}".format(conf.full_node_rpc_user,
full_node_rpc_password,
conf.full_node_url))
# create transaction
tx_outputs = []
unspent = sorted(proxy.listunspent(1, 9999999, [conf.issuing_address]),
key=lambda x: hash(x['amount']),
reverse=True)
issuing_pubkey = proxy.validateaddress(conf.issuing_address)['pubkey']
tx_inputs = [CMutableTxIn(unspent[0]['outpoint'])]
input_amount = unspent[0]['amount']
change_script_out = CBitcoinAddress(conf.issuing_address).to_scriptPubKey()
change_output = CMutableTxOut(input_amount, change_script_out)
op_return_output = CMutableTxOut(
0, CScript([OP_RETURN, op_return_cert_protocol]))
tx_outputs = [change_output, op_return_output]
tx = CMutableTransaction(tx_inputs, tx_outputs)
# sign transaction to get its size
r = proxy.signrawtransaction(tx)
assert r['complete']
signed_tx = r['tx']
signed_tx_size = len(signed_tx.serialize())
# calculate fees and change
tx_fee = signed_tx_size * conf.tx_fee_per_byte
change_amount = input_amount - tx_fee
if (change_amount < 0):
sys.exit(
"Specified address cannot cover the transaction fee of: {} satoshis"
.format(tx_fee))
# update tx out for change and re-sign
tx.vout[0].nValue = change_amount
r = proxy.signrawtransaction(tx)
assert r['complete']
signed_tx = r['tx']
# send transaction
print('The fee will be {} satoshis.\n'.format(tx_fee))
consent = input(
'Do you want to issue on the blockchain? [y/N]: ').lower() in ('y',
'yes')
if not consent:
sys.exit()
tx_id = b2lx(proxy.sendrawtransaction(signed_tx))
return tx_id
