288 lines
9.1 KiB
Python
288 lines
9.1 KiB
Python
|
import six
|
||
|
|
import logging
|
||
|
|
from typing import List
|
||
|
|
from collections import namedtuple
|
||
|
|
|
||
|
|
from torba.basecoin import BaseCoin
|
||
|
|
from torba.basescript import BaseInputScript, BaseOutputScript
|
||
|
|
from torba.bcd_data_stream import BCDataStream
|
||
|
|
from torba.hash import sha256
|
||
|
|
from torba.account import Account
|
||
|
|
from torba.util import ReadOnlyList
|
||
|
|
|
||
|
|
|
||
|
|
log = logging.getLogger()
|
||
|
|
|
||
|
|
|
||
|
|
NULL_HASH = b'\x00'*32
|
||
|
|
|
||
|
|
|
||
|
|
class InputOutput(object):
|
||
|
|
|
||
|
|
@property
|
||
|
|
def size(self):
|
||
|
|
""" Size of this input / output in bytes. """
|
||
|
|
stream = BCDataStream()
|
||
|
|
self.serialize_to(stream)
|
||
|
|
return len(stream.get_bytes())
|
||
|
|
|
||
|
|
def serialize_to(self, stream):
|
||
|
|
raise NotImplemented
|
||
|
|
|
||
|
|
|
||
|
|
class BaseInput(InputOutput):
|
||
|
|
|
||
|
|
script_class = None
|
||
|
|
|
||
|
|
NULL_SIGNATURE = b'\x00'*72
|
||
|
|
NULL_PUBLIC_KEY = b'\x00'*33
|
||
|
|
|
||
|
|
def __init__(self, output_or_txid_index, script, sequence=0xFFFFFFFF):
|
||
|
|
if isinstance(output_or_txid_index, BaseOutput):
|
||
|
|
self.output = output_or_txid_index # type: BaseOutput
|
||
|
|
self.output_txid = self.output.transaction.hash
|
||
|
|
self.output_index = self.output.index
|
||
|
|
else:
|
||
|
|
self.output = None # type: BaseOutput
|
||
|
|
self.output_txid, self.output_index = output_or_txid_index
|
||
|
|
self.sequence = sequence
|
||
|
|
self.is_coinbase = self.output_txid == NULL_HASH
|
||
|
|
self.coinbase = script if self.is_coinbase else None
|
||
|
|
self.script = script if not self.is_coinbase else None # type: BaseInputScript
|
||
|
|
|
||
|
|
def link_output(self, output):
|
||
|
|
assert self.output is None
|
||
|
|
assert self.output_txid == output.transaction.hash
|
||
|
|
assert self.output_index == output.index
|
||
|
|
self.output = output
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def spend(cls, output):
|
||
|
|
""" Create an input to spend the output."""
|
||
|
|
assert output.script.is_pay_pubkey_hash, 'Attempting to spend unsupported output.'
|
||
|
|
script = cls.script_class.redeem_pubkey_hash(cls.NULL_SIGNATURE, cls.NULL_PUBLIC_KEY)
|
||
|
|
return cls(output, script)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def amount(self):
|
||
|
|
""" Amount this input adds to the transaction. """
|
||
|
|
if self.output is None:
|
||
|
|
raise ValueError('Cannot get input value without referenced output.')
|
||
|
|
return self.output.amount
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def deserialize_from(cls, stream):
|
||
|
|
txid = stream.read(32)
|
||
|
|
index = stream.read_uint32()
|
||
|
|
script = stream.read_string()
|
||
|
|
sequence = stream.read_uint32()
|
||
|
|
return cls(
|
||
|
|
(txid, index),
|
||
|
|
cls.script_class(script) if not txid == NULL_HASH else script,
|
||
|
|
sequence
|
||
|
|
)
|
||
|
|
|
||
|
|
def serialize_to(self, stream, alternate_script=None):
|
||
|
|
stream.write(self.output_txid)
|
||
|
|
stream.write_uint32(self.output_index)
|
||
|
|
if alternate_script is not None:
|
||
|
|
stream.write_string(alternate_script)
|
||
|
|
else:
|
||
|
|
if self.is_coinbase:
|
||
|
|
stream.write_string(self.coinbase)
|
||
|
|
else:
|
||
|
|
stream.write_string(self.script.source)
|
||
|
|
stream.write_uint32(self.sequence)
|
||
|
|
|
||
|
|
|
||
|
|
class BaseOutputAmountEstimator(object):
|
||
|
|
|
||
|
|
__slots__ = 'coin', 'output', 'fee', 'effective_amount'
|
||
|
|
|
||
|
|
def __init__(self, coin, txo): # type: (BaseCoin, BaseOutput) -> None
|
||
|
|
self.coin = coin
|
||
|
|
self.output = txo
|
||
|
|
txi = coin.transaction_class.input_class.spend(txo)
|
||
|
|
self.fee = coin.get_input_output_fee(txi)
|
||
|
|
self.effective_amount = txo.amount - self.fee
|
||
|
|
|
||
|
|
def __lt__(self, other):
|
||
|
|
return self.effective_amount < other.effective_amount
|
||
|
|
|
||
|
|
|
||
|
|
class BaseOutput(InputOutput):
|
||
|
|
|
||
|
|
script_class = None
|
||
|
|
estimator_class = BaseOutputAmountEstimator
|
||
|
|
|
||
|
|
def __init__(self, amount, script):
|
||
|
|
self.amount = amount # type: int
|
||
|
|
self.script = script # type: BaseOutputScript
|
||
|
|
self.transaction = None # type: BaseTransaction
|
||
|
|
self.index = None # type: int
|
||
|
|
|
||
|
|
def get_estimator(self, coin):
|
||
|
|
return self.estimator_class(coin, self)
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def pay_pubkey_hash(cls, amount, pubkey_hash):
|
||
|
|
return cls(amount, cls.script_class.pay_pubkey_hash(pubkey_hash))
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def deserialize_from(cls, stream):
|
||
|
|
return cls(
|
||
|
|
amount=stream.read_uint64(),
|
||
|
|
script=cls.script_class(stream.read_string())
|
||
|
|
)
|
||
|
|
|
||
|
|
def serialize_to(self, stream):
|
||
|
|
stream.write_uint64(self.amount)
|
||
|
|
stream.write_string(self.script.source)
|
||
|
|
|
||
|
|
|
||
|
|
class BaseTransaction:
|
||
|
|
|
||
|
|
input_class = None
|
||
|
|
output_class = None
|
||
|
|
|
||
|
|
def __init__(self, raw=None, version=1, locktime=0, height=None, is_saved=False):
|
||
|
|
self._raw = raw
|
||
|
|
self._hash = None
|
||
|
|
self._id = None
|
||
|
|
self.version = version # type: int
|
||
|
|
self.locktime = locktime # type: int
|
||
|
|
self.height = height # type: int
|
||
|
|
self._inputs = [] # type: List[BaseInput]
|
||
|
|
self._outputs = [] # type: List[BaseOutput]
|
||
|
|
self.is_saved = is_saved # type: bool
|
||
|
|
if raw is not None:
|
||
|
|
self._deserialize()
|
||
|
|
|
||
|
|
@property
|
||
|
|
def id(self):
|
||
|
|
if self._id is None:
|
||
|
|
self._id = self.hash[::-1]
|
||
|
|
return self._id
|
||
|
|
|
||
|
|
@property
|
||
|
|
def hash(self):
|
||
|
|
if self._hash is None:
|
||
|
|
self._hash = sha256(sha256(self.raw))
|
||
|
|
return self._hash
|
||
|
|
|
||
|
|
@property
|
||
|
|
def raw(self):
|
||
|
|
if self._raw is None:
|
||
|
|
self._raw = self._serialize()
|
||
|
|
return self._raw
|
||
|
|
|
||
|
|
def _reset(self):
|
||
|
|
self._id = None
|
||
|
|
self._hash = None
|
||
|
|
self._raw = None
|
||
|
|
|
||
|
|
@property
|
||
|
|
def inputs(self): # type: () -> ReadOnlyList[BaseInput]
|
||
|
|
return ReadOnlyList(self._inputs)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def outputs(self): # type: () -> ReadOnlyList[BaseOutput]
|
||
|
|
return ReadOnlyList(self._outputs)
|
||
|
|
|
||
|
|
def add_inputs(self, inputs):
|
||
|
|
self._inputs.extend(inputs)
|
||
|
|
self._reset()
|
||
|
|
return self
|
||
|
|
|
||
|
|
def add_outputs(self, outputs):
|
||
|
|
for txo in outputs:
|
||
|
|
txo.transaction = self
|
||
|
|
txo.index = len(self._outputs)
|
||
|
|
self._outputs.append(txo)
|
||
|
|
self._reset()
|
||
|
|
return self
|
||
|
|
|
||
|
|
@property
|
||
|
|
def fee(self):
|
||
|
|
""" Fee that will actually be paid."""
|
||
|
|
return self.input_sum - self.output_sum
|
||
|
|
|
||
|
|
@property
|
||
|
|
def size(self):
|
||
|
|
""" Size in bytes of the entire transaction. """
|
||
|
|
return len(self.raw)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def base_size(self):
|
||
|
|
""" Size in bytes of transaction meta data and all outputs; without inputs. """
|
||
|
|
return len(self._serialize(with_inputs=False))
|
||
|
|
|
||
|
|
def _serialize(self, with_inputs=True):
|
||
|
|
stream = BCDataStream()
|
||
|
|
stream.write_uint32(self.version)
|
||
|
|
if with_inputs:
|
||
|
|
stream.write_compact_size(len(self._inputs))
|
||
|
|
for txin in self._inputs:
|
||
|
|
txin.serialize_to(stream)
|
||
|
|
stream.write_compact_size(len(self._outputs))
|
||
|
|
for txout in self._outputs:
|
||
|
|
txout.serialize_to(stream)
|
||
|
|
stream.write_uint32(self.locktime)
|
||
|
|
return stream.get_bytes()
|
||
|
|
|
||
|
|
def _serialize_for_signature(self, signing_input):
|
||
|
|
stream = BCDataStream()
|
||
|
|
stream.write_uint32(self.version)
|
||
|
|
stream.write_compact_size(len(self._inputs))
|
||
|
|
for i, txin in enumerate(self._inputs):
|
||
|
|
if signing_input == i:
|
||
|
|
txin.serialize_to(stream, txin.output.script.source)
|
||
|
|
else:
|
||
|
|
txin.serialize_to(stream, b'')
|
||
|
|
stream.write_compact_size(len(self._outputs))
|
||
|
|
for txout in self._outputs:
|
||
|
|
txout.serialize_to(stream)
|
||
|
|
stream.write_uint32(self.locktime)
|
||
|
|
stream.write_uint32(1) # signature hash type: SIGHASH_ALL
|
||
|
|
return stream.get_bytes()
|
||
|
|
|
||
|
|
def _deserialize(self):
|
||
|
|
if self._raw is not None:
|
||
|
|
stream = BCDataStream(self._raw)
|
||
|
|
self.version = stream.read_uint32()
|
||
|
|
input_count = stream.read_compact_size()
|
||
|
|
self.add_inputs([
|
||
|
|
self.input_class.deserialize_from(stream) for _ in range(input_count)
|
||
|
|
])
|
||
|
|
output_count = stream.read_compact_size()
|
||
|
|
self.add_outputs([
|
||
|
|
self.output_class.deserialize_from(stream) for _ in range(output_count)
|
||
|
|
])
|
||
|
|
self.locktime = stream.read_uint32()
|
||
|
|
|
||
|
|
def sign(self, account): # type: (Account) -> BaseTransaction
|
||
|
|
for i, txi in enumerate(self._inputs):
|
||
|
|
txo_script = txi.output.script
|
||
|
|
if txo_script.is_pay_pubkey_hash:
|
||
|
|
address = account.coin.hash160_to_address(txo_script.values['pubkey_hash'])
|
||
|
|
private_key = account.get_private_key_for_address(address)
|
||
|
|
tx = self._serialize_for_signature(i)
|
||
|
|
txi.script.values['signature'] = private_key.sign(tx)+six.int2byte(1)
|
||
|
|
txi.script.values['pubkey'] = private_key.public_key.pubkey_bytes
|
||
|
|
txi.script.generate()
|
||
|
|
self._reset()
|
||
|
|
return self
|
||
|
|
|
||
|
|
def sort(self):
|
||
|
|
# See https://github.com/kristovatlas/rfc/blob/master/bips/bip-li01.mediawiki
|
||
|
|
self._inputs.sort(key=lambda i: (i['prevout_hash'], i['prevout_n']))
|
||
|
|
self._outputs.sort(key=lambda o: (o[2], pay_script(o[0], o[1])))
|
||
|
|
|
||
|
|
@property
|
||
|
|
def input_sum(self):
|
||
|
|
return sum(i.amount for i in self._inputs)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def output_sum(self):
|
||
|
|
return sum(o.amount for o in self._outputs)
|