def parse_from_hex(self, raw_hex):
offset = 4
self._version = decode_uint32(raw_hex[:4])
input_cnt, varint_size = decode_varint(raw_hex[offset:])
self.input_cnt = input_cnt
offset += varint_size
self._inputs = []
for i in range(input_cnt):
tx_input = TransactionInput().parse_from_hex(raw_hex[offset:])
print tx_input.__repr__()
offset += tx_input.size
self._inputs.append(input)
output_cnt, varint_size = decode_varint(raw_hex[offset:])
offset += varint_size
self.output_cnt = output_cnt
self._outputs = []
for i in range(output_cnt):
tx_output = TransactionOutput().parse_from_hex(raw_hex[offset:])
print tx_output.__repr__()
offset += tx_output.size
self._outputs.append(tx_output)
self.size = offset + 4
self.hash = format_hash(double_sha256(raw_hex[:self.size]))
return self
def __init__(self, raw_hex):
self._hash = None
self._txid = None
self.inputs = None
self.outputs = None
self._version = None
self._locktime = None
self.n_inputs = 0
self.n_outputs = 0
self.is_segwit = False
offset = 4
# adds basic support for segwit transactions
# - https://bitcoincore.org/en/segwit_wallet_dev/
# - https://en.bitcoin.it/wiki/Protocol_documentation#BlockTransactions
if b'\x00\x01' == raw_hex[offset:offset + 2]:
self.is_segwit = True
offset += 2
self.n_inputs, varint_size = decode_varint(raw_hex[offset:])
offset += varint_size
self.inputs = []
for i in range(self.n_inputs):
input = Input.from_hex(raw_hex[offset:])
offset += input.size
self.inputs.append(input)
self.n_outputs, varint_size = decode_varint(raw_hex[offset:])
offset += varint_size
self.outputs = []
for i in range(self.n_outputs):
output = Output.from_hex(raw_hex[offset:])
offset += output.size
self.outputs.append(output)
if self.is_segwit:
self._offset_before_tx_witnesses = offset
for inp in self.inputs:
tx_witnesses_n, varint_size = decode_varint(raw_hex[offset:])
offset += varint_size
for j in range(tx_witnesses_n):
component_length, varint_size = decode_varint(
raw_hex[offset:])
offset += varint_size
witness = raw_hex[offset:offset + component_length]
inp.add_witness(witness)
offset += component_length
self.size = offset + 4
self.hex = raw_hex[:self.size]
def parse_transactions(self, raw_hex):
tx_cnt, offset = decode_varint(raw_hex)
self._tx_cnt = tx_cnt
for i in range(tx_cnt):
transaction = Transaction().parse_from_hex(raw_hex[offset:])
print transaction.__repr__()
offset += transaction.size
self._tx_list.append(transaction)
def parse_from_hex(self, raw_hex):
script_length, varint_size = decode_varint(raw_hex[8:])
script_start = 8 + varint_size
self.size = script_start + script_length
self._value = decode_uint64(raw_hex[:8])
self._script = raw_hex[script_start:script_start + script_length]
# self.type = self.get_type()
return self
def n_transactions(self):
"""Return the number of transactions contained in this block,
it is faster to use this than to use len(block.transactions)
as there's no need to parse all transactions to get this information
"""
if self._n_transactions is None:
self._n_transactions = decode_varint(self.hex[80:])[0]
return self._n_transactions
def __init__(self, raw_hex):
self._value = None
self._script = None
self._addresses = None
script_length, varint_size = decode_varint(raw_hex[8:])
script_start = 8 + varint_size
self._script_hex = raw_hex[script_start:script_start + script_length]
self.size = script_start + script_length
self._value_hex = raw_hex[:8]
def parse_from_hex(self, raw_hex):
script_length, varint_length = decode_varint(raw_hex[36:])
script_start = 36 + varint_length
self.size = script_start + script_length + 4
real_hex = raw_hex[:self.size]
self._previous_transaction_hash = format_hash(real_hex[:32])
self._previous_transaction_index = decode_uint32(real_hex[32:36])
self._script = Script(real_hex[script_start:(script_start +
script_length)])
self._sequence_number = decode_uint32(real_hex[(self.size -
4):self.size])
return self
def __init__(self, raw_hex):
self._transaction_hash = None
self._transaction_index = None
self._script = None
self._sequence_number = None
self._witnesses = []
self._script_length, varint_length = decode_varint(raw_hex[36:])
self._script_start = 36 + varint_length
self.size = self._script_start + self._script_length + 4
self.hex = raw_hex[:self.size]
def get_block_transactions(raw_hex):
"""Given the raw hexadecimal representation of a block,
yields the block's transactions
"""
# Skipping the header
transaction_data = raw_hex[80:]
# Decoding the number of transactions, offset is the size of
# the varint (1 to 9 bytes)
n_transactions, offset = decode_varint(transaction_data)
for i in range(n_transactions):
transaction = Transaction.from_hex(transaction_data[offset:])
yield transaction
# Skipping to the next transaction
offset += transaction.size
