def calculate_utxo(self,
block,
utxo_file_path=UTXO_FILE,
del_old=0,
save=1):
self.create_utxo_if_not_exit(utxo_file_path)
if del_old:
utxo_file = open(utxo_file_path, "w+")
else:
utxo_file = open(utxo_file_path, "a+")
utxos_dict = []
result_outputs_dict = ""
for i in block.transactions:
tx = Transaction(False, False)
tx.set_signed_raw_tx(i)
tx_outputs_dict = json.loads(tx.deserialize_raw_tx())['outputs']
out_id = 0
for j in tx_outputs_dict:
j['address'] = base58.b58encode_check(
bytes.fromhex('6f' + j['script'][6:46])).decode('utf-8')
j['tx_id'] = hashlib.sha256(
hashlib.sha256(bytes.fromhex(i)).digest()).hexdigest()
j['output_id'] = out_id
utxos_dict.append(j)
result_outputs_dict += str(j) + "\n"
out_id += 1
if save:
utxo_file.write("%s" % result_outputs_dict)
utxo_file.close()
if len(utxos_dict) < 1:
return False
else:
return utxos_dict
def find_tx(self, block, tx_id):
for i in block.transactions:
tx = Transaction(False, False)
tx.set_signed_raw_tx(i)
if flip_byte_order(
hashlib.sha256(hashlib.sha256(
bytes.fromhex(i)).digest()).hexdigest()) == tx_id:
return tx.deserialize_raw_tx()
return False
def verify_tx(self, raw_tx, utxo_flags):
tx = Transaction(False, False)
tx.set_signed_raw_tx(raw_tx)
tx_dict = json.loads(tx.deserialize_raw_tx())
print(tx_dict)
tx_inputs = []
for j in tx_dict['inputs']:
output_tx_id = j['prev_tx_id']
output_id = j['out_index']
tx_inputs.append({
'output_tx_id': output_tx_id,
'output_id': output_id
})
inputs_amount = 0
for j in tx_inputs:
input_found = 0
for utxo_flag in utxo_flags:
if j['output_tx_id'] == utxo_flag[0]['tx_id'] and j[
'output_id'] == utxo_flag[0]['output_id']:
input_found = 1
if utxo_flag[1] == 1:
print("[from: node]: BAD TX! INPUT ALREADY SPENT")
return False
utxo_flag[1] = 1
inputs_amount += float(utxo_flag[0]['value'])
if not input_found:
print("[from: node]: BAD TX! CANNOT FIND INPUT!")
return False
outputs_amount = 0.0
for i in tx_dict['outputs']:
outputs_amount += float(i['value'])
if outputs_amount > inputs_amount:
print(
"[from: node]: BAD TX! OUTPUTS VALUE SHOULD BE GREATER THAN INPUTS!"
)
return False
print("amount of inputs", inputs_amount, "amount of outputs",
outputs_amount)
if not self.execute_script(tx, "out"):
return False
return True
