forked from LBRYCommunity/lbry-sdk
615 lines
20 KiB
Python
615 lines
20 KiB
Python
# Copyright (c) 2016-2017, Neil Booth
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# Copyright (c) 2017, the ElectrumX authors
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#
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# All rights reserved.
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#
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# The MIT License (MIT)
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# and warranty status of this software.
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"""Transaction-related classes and functions."""
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from collections import namedtuple
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from lbry.wallet.server.hash import sha256, double_sha256, hash_to_hex_str
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from lbry.wallet.server.script import OpCodes
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from lbry.wallet.server.util import (
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unpack_le_int32_from, unpack_le_int64_from, unpack_le_uint16_from,
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unpack_le_uint32_from, unpack_le_uint64_from, pack_le_int32, pack_varint,
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pack_le_uint32, pack_le_int64, pack_varbytes,
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)
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ZERO = bytes(32)
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MINUS_1 = 4294967295
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class Tx(namedtuple("Tx", "version inputs outputs locktime raw")):
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"""Class representing a transaction."""
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class TxInput(namedtuple("TxInput", "prev_hash prev_idx script sequence")):
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"""Class representing a transaction input."""
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def __str__(self):
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script = self.script.hex()
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prev_hash = hash_to_hex_str(self.prev_hash)
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return (f"Input({prev_hash}, {self.prev_idx:d}, script={script}, sequence={self.sequence:d})")
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def is_generation(self):
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"""Test if an input is generation/coinbase like"""
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return self.prev_idx == MINUS_1 and self.prev_hash == ZERO
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def serialize(self):
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return b''.join((
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self.prev_hash,
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pack_le_uint32(self.prev_idx),
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pack_varbytes(self.script),
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pack_le_uint32(self.sequence),
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))
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class TxOutput(namedtuple("TxOutput", "value pk_script")):
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def serialize(self):
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return b''.join((
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pack_le_int64(self.value),
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pack_varbytes(self.pk_script),
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))
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class Deserializer:
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"""Deserializes blocks into transactions.
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External entry points are read_tx(), read_tx_and_hash(),
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read_tx_and_vsize() and read_block().
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This code is performance sensitive as it is executed 100s of
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millions of times during sync.
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"""
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TX_HASH_FN = staticmethod(double_sha256)
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def __init__(self, binary, start=0):
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assert isinstance(binary, bytes)
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self.binary = binary
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self.binary_length = len(binary)
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self.cursor = start
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self.flags = 0
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def read_tx(self):
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"""Return a deserialized transaction."""
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start = self.cursor
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return Tx(
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self._read_le_int32(), # version
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self._read_inputs(), # inputs
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self._read_outputs(), # outputs
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self._read_le_uint32(), # locktime
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self.binary[start:self.cursor],
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)
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def read_tx_and_hash(self):
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"""Return a (deserialized TX, tx_hash) pair.
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The hash needs to be reversed for human display; for efficiency
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we process it in the natural serialized order.
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"""
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start = self.cursor
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return self.read_tx(), self.TX_HASH_FN(self.binary[start:self.cursor])
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def read_tx_and_vsize(self):
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"""Return a (deserialized TX, vsize) pair."""
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return self.read_tx(), self.binary_length
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def read_tx_block(self):
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"""Returns a list of (deserialized_tx, tx_hash) pairs."""
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read = self.read_tx_and_hash
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# Some coins have excess data beyond the end of the transactions
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return [read() for _ in range(self._read_varint())]
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def _read_inputs(self):
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read_input = self._read_input
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return [read_input() for i in range(self._read_varint())]
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def _read_input(self):
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return TxInput(
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self._read_nbytes(32), # prev_hash
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self._read_le_uint32(), # prev_idx
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self._read_varbytes(), # script
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self._read_le_uint32() # sequence
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)
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def _read_outputs(self):
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read_output = self._read_output
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return [read_output() for i in range(self._read_varint())]
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def _read_output(self):
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return TxOutput(
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self._read_le_int64(), # value
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self._read_varbytes(), # pk_script
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)
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def _read_byte(self):
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cursor = self.cursor
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self.cursor += 1
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return self.binary[cursor]
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def _read_nbytes(self, n):
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cursor = self.cursor
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self.cursor = end = cursor + n
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assert self.binary_length >= end
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return self.binary[cursor:end]
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def _read_varbytes(self):
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return self._read_nbytes(self._read_varint())
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def _read_varint(self):
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n = self.binary[self.cursor]
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self.cursor += 1
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if n < 253:
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return n
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if n == 253:
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return self._read_le_uint16()
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if n == 254:
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return self._read_le_uint32()
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return self._read_le_uint64()
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def _read_le_int32(self):
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result, = unpack_le_int32_from(self.binary, self.cursor)
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self.cursor += 4
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return result
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def _read_le_int64(self):
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result, = unpack_le_int64_from(self.binary, self.cursor)
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self.cursor += 8
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return result
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def _read_le_uint16(self):
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result, = unpack_le_uint16_from(self.binary, self.cursor)
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self.cursor += 2
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return result
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def _read_le_uint32(self):
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result, = unpack_le_uint32_from(self.binary, self.cursor)
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self.cursor += 4
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return result
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def _read_le_uint64(self):
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result, = unpack_le_uint64_from(self.binary, self.cursor)
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self.cursor += 8
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return result
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class TxSegWit(namedtuple("Tx", "version marker flag inputs outputs "
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"witness locktime raw")):
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"""Class representing a SegWit transaction."""
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class DeserializerSegWit(Deserializer):
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# https://bitcoincore.org/en/segwit_wallet_dev/#transaction-serialization
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def _read_witness(self, fields):
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read_witness_field = self._read_witness_field
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return [read_witness_field() for i in range(fields)]
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def _read_witness_field(self):
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read_varbytes = self._read_varbytes
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return [read_varbytes() for i in range(self._read_varint())]
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def _read_tx_parts(self):
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"""Return a (deserialized TX, tx_hash, vsize) tuple."""
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start = self.cursor
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marker = self.binary[self.cursor + 4]
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if marker:
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tx = super().read_tx()
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tx_hash = self.TX_HASH_FN(self.binary[start:self.cursor])
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return tx, tx_hash, self.binary_length
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# Ugh, this is nasty.
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version = self._read_le_int32()
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orig_ser = self.binary[start:self.cursor]
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marker = self._read_byte()
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flag = self._read_byte()
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start = self.cursor
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inputs = self._read_inputs()
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outputs = self._read_outputs()
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orig_ser += self.binary[start:self.cursor]
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base_size = self.cursor - start
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witness = self._read_witness(len(inputs))
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start = self.cursor
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locktime = self._read_le_uint32()
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orig_ser += self.binary[start:self.cursor]
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vsize = (3 * base_size + self.binary_length) // 4
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return TxSegWit(version, marker, flag, inputs, outputs, witness,
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locktime, orig_ser), self.TX_HASH_FN(orig_ser), vsize
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def read_tx(self):
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return self._read_tx_parts()[0]
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def read_tx_and_hash(self):
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tx, tx_hash, vsize = self._read_tx_parts()
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return tx, tx_hash
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def read_tx_and_vsize(self):
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tx, tx_hash, vsize = self._read_tx_parts()
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return tx, vsize
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class DeserializerAuxPow(Deserializer):
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VERSION_AUXPOW = (1 << 8)
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def read_header(self, height, static_header_size):
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"""Return the AuxPow block header bytes"""
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start = self.cursor
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version = self._read_le_uint32()
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if version & self.VERSION_AUXPOW:
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# We are going to calculate the block size then read it as bytes
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self.cursor = start
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self.cursor += static_header_size # Block normal header
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self.read_tx() # AuxPow transaction
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self.cursor += 32 # Parent block hash
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merkle_size = self._read_varint()
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self.cursor += 32 * merkle_size # Merkle branch
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self.cursor += 4 # Index
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merkle_size = self._read_varint()
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self.cursor += 32 * merkle_size # Chain merkle branch
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self.cursor += 4 # Chain index
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self.cursor += 80 # Parent block header
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header_end = self.cursor
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else:
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header_end = static_header_size
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self.cursor = start
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return self._read_nbytes(header_end)
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class DeserializerAuxPowSegWit(DeserializerSegWit, DeserializerAuxPow):
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pass
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class DeserializerEquihash(Deserializer):
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def read_header(self, height, static_header_size):
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"""Return the block header bytes"""
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start = self.cursor
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# We are going to calculate the block size then read it as bytes
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self.cursor += static_header_size
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solution_size = self._read_varint()
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self.cursor += solution_size
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header_end = self.cursor
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self.cursor = start
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return self._read_nbytes(header_end)
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class DeserializerEquihashSegWit(DeserializerSegWit, DeserializerEquihash):
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pass
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class TxJoinSplit(namedtuple("Tx", "version inputs outputs locktime")):
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"""Class representing a JoinSplit transaction."""
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class DeserializerZcash(DeserializerEquihash):
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def read_tx(self):
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header = self._read_le_uint32()
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overwintered = ((header >> 31) == 1)
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if overwintered:
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version = header & 0x7fffffff
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self.cursor += 4 # versionGroupId
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else:
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version = header
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is_overwinter_v3 = version == 3
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is_sapling_v4 = version == 4
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base_tx = TxJoinSplit(
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version,
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self._read_inputs(), # inputs
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self._read_outputs(), # outputs
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self._read_le_uint32() # locktime
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)
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if is_overwinter_v3 or is_sapling_v4:
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self.cursor += 4 # expiryHeight
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has_shielded = False
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if is_sapling_v4:
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self.cursor += 8 # valueBalance
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shielded_spend_size = self._read_varint()
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self.cursor += shielded_spend_size * 384 # vShieldedSpend
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shielded_output_size = self._read_varint()
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self.cursor += shielded_output_size * 948 # vShieldedOutput
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has_shielded = shielded_spend_size > 0 or shielded_output_size > 0
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if base_tx.version >= 2:
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joinsplit_size = self._read_varint()
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if joinsplit_size > 0:
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joinsplit_desc_len = 1506 + (192 if is_sapling_v4 else 296)
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# JSDescription
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self.cursor += joinsplit_size * joinsplit_desc_len
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self.cursor += 32 # joinSplitPubKey
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self.cursor += 64 # joinSplitSig
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if is_sapling_v4 and has_shielded:
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self.cursor += 64 # bindingSig
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return base_tx
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class TxTime(namedtuple("Tx", "version time inputs outputs locktime")):
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"""Class representing transaction that has a time field."""
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class DeserializerTxTime(Deserializer):
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def read_tx(self):
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return TxTime(
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self._read_le_int32(), # version
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self._read_le_uint32(), # time
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self._read_inputs(), # inputs
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self._read_outputs(), # outputs
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self._read_le_uint32(), # locktime
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)
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class DeserializerReddcoin(Deserializer):
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def read_tx(self):
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version = self._read_le_int32()
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inputs = self._read_inputs()
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outputs = self._read_outputs()
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locktime = self._read_le_uint32()
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if version > 1:
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time = self._read_le_uint32()
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else:
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time = 0
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return TxTime(version, time, inputs, outputs, locktime)
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class DeserializerTxTimeAuxPow(DeserializerTxTime):
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VERSION_AUXPOW = (1 << 8)
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def is_merged_block(self):
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start = self.cursor
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self.cursor = 0
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version = self._read_le_uint32()
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self.cursor = start
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if version & self.VERSION_AUXPOW:
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return True
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return False
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def read_header(self, height, static_header_size):
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"""Return the AuxPow block header bytes"""
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start = self.cursor
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version = self._read_le_uint32()
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if version & self.VERSION_AUXPOW:
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# We are going to calculate the block size then read it as bytes
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self.cursor = start
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self.cursor += static_header_size # Block normal header
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self.read_tx() # AuxPow transaction
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self.cursor += 32 # Parent block hash
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merkle_size = self._read_varint()
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self.cursor += 32 * merkle_size # Merkle branch
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self.cursor += 4 # Index
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merkle_size = self._read_varint()
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self.cursor += 32 * merkle_size # Chain merkle branch
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self.cursor += 4 # Chain index
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self.cursor += 80 # Parent block header
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header_end = self.cursor
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else:
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header_end = static_header_size
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self.cursor = start
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return self._read_nbytes(header_end)
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class DeserializerBitcoinAtom(DeserializerSegWit):
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FORK_BLOCK_HEIGHT = 505888
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def read_header(self, height, static_header_size):
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"""Return the block header bytes"""
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header_len = static_header_size
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if height >= self.FORK_BLOCK_HEIGHT:
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header_len += 4 # flags
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return self._read_nbytes(header_len)
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class DeserializerGroestlcoin(DeserializerSegWit):
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TX_HASH_FN = staticmethod(sha256)
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class TxInputTokenPay(TxInput):
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"""Class representing a TokenPay transaction input."""
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OP_ANON_MARKER = 0xb9
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# 2byte marker (cpubkey + sigc + sigr)
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MIN_ANON_IN_SIZE = 2 + (33 + 32 + 32)
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def _is_anon_input(self):
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return (len(self.script) >= self.MIN_ANON_IN_SIZE and
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self.script[0] == OpCodes.OP_RETURN and
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self.script[1] == self.OP_ANON_MARKER)
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def is_generation(self):
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# Transactions coming in from stealth addresses are seen by
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# the blockchain as newly minted coins. The reverse, where coins
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# are sent TO a stealth address, are seen by the blockchain as
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# a coin burn.
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if self._is_anon_input():
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return True
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return super().is_generation()
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class TxInputTokenPayStealth(
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namedtuple("TxInput", "keyimage ringsize script sequence")):
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"""Class representing a TokenPay stealth transaction input."""
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def __str__(self):
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script = self.script.hex()
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keyimage = bytes(self.keyimage).hex()
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return (f"Input({keyimage}, {self.ringsize[1]:d}, script={script}, sequence={self.sequence:d})")
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def is_generation(self):
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return True
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def serialize(self):
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return b''.join((
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self.keyimage,
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self.ringsize,
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pack_varbytes(self.script),
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pack_le_uint32(self.sequence),
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))
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class DeserializerTokenPay(DeserializerTxTime):
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def _read_input(self):
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txin = TxInputTokenPay(
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self._read_nbytes(32), # prev_hash
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self._read_le_uint32(), # prev_idx
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self._read_varbytes(), # script
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self._read_le_uint32(), # sequence
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)
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if txin._is_anon_input():
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# Not sure if this is actually needed, and seems
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# extra work for no immediate benefit, but it at
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# least correctly represents a stealth input
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raw = txin.serialize()
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deserializer = Deserializer(raw)
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txin = TxInputTokenPayStealth(
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deserializer._read_nbytes(33), # keyimage
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deserializer._read_nbytes(3), # ringsize
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deserializer._read_varbytes(), # script
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deserializer._read_le_uint32() # sequence
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)
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return txin
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# Decred
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class TxInputDcr(namedtuple("TxInput", "prev_hash prev_idx tree sequence")):
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"""Class representing a Decred transaction input."""
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def __str__(self):
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prev_hash = hash_to_hex_str(self.prev_hash)
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return (f"Input({prev_hash}, {self.prev_idx:d}, tree={self.tree}, sequence={self.sequence:d})")
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def is_generation(self):
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"""Test if an input is generation/coinbase like"""
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return self.prev_idx == MINUS_1 and self.prev_hash == ZERO
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class TxOutputDcr(namedtuple("TxOutput", "value version pk_script")):
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"""Class representing a Decred transaction output."""
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pass
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class TxDcr(namedtuple("Tx", "version inputs outputs locktime expiry "
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"witness")):
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"""Class representing a Decred transaction."""
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class DeserializerDecred(Deserializer):
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@staticmethod
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def blake256(data):
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from blake256.blake256 import blake_hash
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return blake_hash(data)
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@staticmethod
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def blake256d(data):
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from blake256.blake256 import blake_hash
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return blake_hash(blake_hash(data))
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def read_tx(self):
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return self._read_tx_parts(produce_hash=False)[0]
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def read_tx_and_hash(self):
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tx, tx_hash, vsize = self._read_tx_parts()
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return tx, tx_hash
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def read_tx_and_vsize(self):
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tx, tx_hash, vsize = self._read_tx_parts(produce_hash=False)
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return tx, vsize
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|
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def read_tx_block(self):
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"""Returns a list of (deserialized_tx, tx_hash) pairs."""
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|
read = self.read_tx_and_hash
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txs = [read() for _ in range(self._read_varint())]
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stxs = [read() for _ in range(self._read_varint())]
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return txs + stxs
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def read_tx_tree(self):
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"""Returns a list of deserialized_tx without tx hashes."""
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|
read_tx = self.read_tx
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return [read_tx() for _ in range(self._read_varint())]
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def _read_input(self):
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return TxInputDcr(
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self._read_nbytes(32), # prev_hash
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self._read_le_uint32(), # prev_idx
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self._read_byte(), # tree
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|
self._read_le_uint32(), # sequence
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|
)
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def _read_output(self):
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return TxOutputDcr(
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|
self._read_le_int64(), # value
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|
self._read_le_uint16(), # version
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self._read_varbytes(), # pk_script
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|
)
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|
|
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def _read_witness(self, fields):
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|
read_witness_field = self._read_witness_field
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|
assert fields == self._read_varint()
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return [read_witness_field() for _ in range(fields)]
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|
|
def _read_witness_field(self):
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|
value_in = self._read_le_int64()
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|
block_height = self._read_le_uint32()
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|
block_index = self._read_le_uint32()
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|
script = self._read_varbytes()
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|
return value_in, block_height, block_index, script
|
|
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|
def _read_tx_parts(self, produce_hash=True):
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|
start = self.cursor
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|
version = self._read_le_int32()
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|
inputs = self._read_inputs()
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|
outputs = self._read_outputs()
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|
locktime = self._read_le_uint32()
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|
expiry = self._read_le_uint32()
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|
end_prefix = self.cursor
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|
witness = self._read_witness(len(inputs))
|
|
|
|
if produce_hash:
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|
# TxSerializeNoWitness << 16 == 0x10000
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|
no_witness_header = pack_le_uint32(0x10000 | (version & 0xffff))
|
|
prefix_tx = no_witness_header + self.binary[start+4:end_prefix]
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|
tx_hash = self.blake256(prefix_tx)
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|
else:
|
|
tx_hash = None
|
|
|
|
return TxDcr(
|
|
version,
|
|
inputs,
|
|
outputs,
|
|
locktime,
|
|
expiry,
|
|
witness
|
|
), tx_hash, self.cursor - start
|