《区块链编程》第五章

Posted 从化北

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文章目录

《区块链编程》第五章

交易

交易的组成

  1. 版本号
  2. 输入
    i. 父交易的id
    ii. 父交易output的序号
    iii. 签名脚本
    iv. 序列号
  3. 输出
    i. amount
    ii. 公钥脚本
  4. 时间锁

练习1

p88

代码实现

from helper import little_endian_to_int
from io import BytesIO


class Tx:

    def __init__(self, version, tx_ins, tx_outs, locktime, testnet=False):
        self.version = version
        self.tx_ins = tx_ins  # <1>
        self.tx_outs = tx_outs
        self.locktime = locktime
        self.testnet = testnet  # <2>

    def __repr__(self):
        tx_ins = ''
        for tx_in in self.tx_ins:
            tx_ins += tx_in.__repr__() + '\\n'
        tx_outs = ''
        for tx_out in self.tx_outs:
            tx_outs += tx_out.__repr__() + '\\n'
        return 'tx: \\nversion: \\ntx_ins:\\ntx_outs:\\nlocktime: '.format(
            self.id(),
            self.version,
            tx_ins,
            tx_outs,
            self.locktime,
        )

    def id(self):  # <3>
        '''Human-readable hexadecimal of the transaction hash'''
        return self.hash().hex()

    def hash(self):  # <4>
        '''Binary hash of the legacy serialization'''
        return hash256(self.serialize())[::-1]
    # end::source1[]

    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        version = little_endian_to_int(s.read(4))
        return cls(version, None, None, None, testnet=testnet)
if __name__ == '__main__':
    tx = '01000000'
    stream = BytesIO(bytes.fromhex(tx))
    print(Tx.parse(stream).version)

测试

1
[Finished in 306ms]

练习2

p92

代码实现

# -*- coding: utf-8 -*-
# @Author: 从化北(喵星人)
# @Date:   2022-01-04 15:38:18
# @Last Modified by:   从化北
# @Last Modified time: 2022-01-04 16:33:55
from helper import little_endian_to_int, read_varint
from io import BytesIO
from script import Script


class Tx:

    def __init__(self, version, tx_ins, tx_outs, locktime, testnet=False):
        self.version = version
        self.tx_ins = tx_ins  #
        self.tx_outs = tx_outs
        self.locktime = locktime
        self.testnet = testnet  # 


    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        # BytesIO的read会改变游标的位置。但不会更改BytesIO的数据
        version = little_endian_to_int(s.read(4))
        num_inputs = read_varint(s)
        inputs = []
        for _ in range(num_inputs):
            inputs.append(TxIn.parse(s))
        return cls(version, inputs, None, None, testnet=testnet)

class TxIn:
    def __init__(self, prev_tx, prev_index, script_sig=None, sequence=0xffffffff):
        self.prev_tx = prev_tx
        self.prev_index = prev_index
        if script_sig is None:  # <1>
            self.script_sig = Script()
        else:
            self.script_sig = script_sig
        self.sequence = sequence

    def __repr__(self):
        return ':'.format(
            self.prev_tx.hex(),
            self.prev_index,
        )
    # end::source2[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_input at the start
        return a TxIn object
        '''
        prev_tx = s.read(32)[::-1]
        prev_index = little_endian_to_int(s.read(4))
        script_sig = Script.parse(s)
        sequence = little_endian_to_int(s.read(4))
        return cls(prev_tx, prev_index, script_sig, sequence)


if __name__ == '__main__':
    raw_tx = bytes.fromhex('0100000001813f79011acb80925dfe69b3def355fe914bd1d96a3f5f71bf8303c6a989c7d1000000006b483045022100ed81ff192e75a3fd2304004dcadb746fa5e24c5031ccfcf21320b0277457c98f02207a986d955c6e0cb35d446a89d3f56100f4d7f67801c31967743a9c8e10615bed01210349fc4e631e3624a545de3f89f5d8684c7b8138bd94bdd531d2e213bf016b278afeffffff02a135ef01000000001976a914bc3b654dca7e56b04dca18f2566cdaf02e8d9ada88ac99c39800000000001976a9141c4bc762dd5423e332166702cb75f40df79fea1288ac19430600')
    stream = BytesIO(raw_tx)
    tx = Tx.parse(stream)
    print(tx.tx_ins)

测试

[d1c789a9c60383bf715f3f6ad9d14b91fe55f3deb369fe5d9280cb1a01793f81:0]
[Finished in 309ms]

练习3

p94

代码实现

# -*- coding: utf-8 -*-
# @Author: 从化北(喵星人)
# @Date:   2022-01-04 16:58:44
# @Last Modified by:   从化北
# @Last Modified time: 2022-01-04 17:03:18
from helper import little_endian_to_int, read_varint
from io import BytesIO
from script import Script


class Tx:

    def __init__(self, version, tx_ins, tx_outs, locktime, testnet=False):
        self.version = version
        self.tx_ins = tx_ins  #
        self.tx_outs = tx_outs
        self.locktime = locktime
        self.testnet = testnet  #

    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        # BytesIO的read会改变游标的位置。但不会更改BytesIO的数据
        version = little_endian_to_int(s.read(4))
        num_inputs = read_varint(s)
        inputs = []
        for _ in range(num_inputs):
            inputs.append(TxIn.parse(s))
        num_outputs = read_varint(s)
        outputs = []
        for _ in range(num_outputs):
            outputs.append(TxOut.parse(s))
        return cls(version, inputs, outputs, None, testnet=testnet)


class TxIn:
    def __init__(self, prev_tx, prev_index, script_sig=None, sequence=0xffffffff):
        self.prev_tx = prev_tx
        self.prev_index = prev_index
        if script_sig is None:  # <1>
            self.script_sig = Script()
        else:
            self.script_sig = script_sig
        self.sequence = sequence

    def __repr__(self):
        return ':'.format(
            self.prev_tx.hex(),
            self.prev_index,
        )
    # end::source2[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_input at the start
        return a TxIn object
        '''
        prev_tx = s.read(32)[::-1]
        prev_index = little_endian_to_int(s.read(4))
        script_sig = Script.parse(s)
        sequence = little_endian_to_int(s.read(4))
        return cls(prev_tx, prev_index, script_sig, sequence)


class TxOut:

    def __init__(self, amount, script_pubkey):
        self.amount = amount
        self.script_pubkey = script_pubkey

    def __repr__(self):
        return ':'.format(self.amount, self.script_pubkey)
    # end::source3[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_output at the start
        return a TxOut object
        '''
        amount = little_endian_to_int(s.read(8))
        script_pubkey = Script.parse(s)
        return cls(amount, script_pubkey)
        # amount is an integer in 8 bytes, little endian
        # use Script.parse to get the ScriptPubKey
        # return an instance of the class (see __init__ for args)
        # raise NotImplementedError

    # tag::source4[]
    def serialize(self):  # <1>
        '''Returns the byte serialization of the transaction output'''
        result = int_to_little_endian(self.amount, 8)
        result += self.script_pubkey.serialize()
        return result
    # end::source4[]


if __name__ == '__main__':
    raw_tx = bytes.fromhex('0100000001813f79011acb80925dfe69b3def355fe914bd1d96a3f5f71bf8303c6a989c7d1000000006b483045022100ed81ff192e75a3fd2304004dcadb746fa5e24c5031ccfcf21320b0277457c98f02207a986d955c6e0cb35d446a89d3f56100f4d7f67801c31967743a9c8e10615bed01210349fc4e631e3624a545de3f89f5d8684c7b8138bd94bdd531d2e213bf016b278afeffffff02a135ef01000000001976a914bc3b654dca7e56b04dca18f2566cdaf02e8d9ada88ac99c39800000000001976a9141c4bc762dd5423e332166702cb75f40df79fea1288ac19430600')
    stream = BytesIO(raw_tx)
    tx = Tx.parse(stream)
    # print(tx.tx_ins)
    print(tx.tx_outs)

测试

[32454049:OP_DUP OP_HASH160 bc3b654dca7e56b04dca18f2566cdaf02e8d9ada OP_EQUALVERIFY OP_CHECKSIG, 10011545:OP_DUP OP_HASH160 1c4bc762dd5423e332166702cb75f40df79fea12 OP_EQUALVERIFY OP_CHECKSIG]
[Finished in 319ms]

练习4

p95

代码实现

# -*- coding: utf-8 -*-
# @Author: 从化北(喵星人)
# @Date:   2022-01-04 17:04:41
# @Last Modified by:   从化北
# @Last Modified time: 2022-01-04 17:05:35
from helper import little_endian_to_int, read_varint
from io import BytesIO
from script import Script


class Tx:

    def __init__(self, version, tx_ins, tx_outs, locktime, testnet=False):
        self.version = version
        self.tx_ins = tx_ins  #
        self.tx_outs = tx_outs
        self.locktime = locktime
        self.testnet = testnet  #

    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        # BytesIO的read会改变游标的位置。但不会更改BytesIO的数据
        version = little_endian_to_int(s.read(4))
        num_inputs = read_varint(s)
        inputs = []
        for _ in range(num_inputs):
            inputs.append(TxIn.parse(s))
        num_outputs = read_varint(s)
        outputs = []
        for _ in range(num_outputs):
            outputs.append(TxOut.parse(s))
        locktime = little_endian_to_int(s.read(4))
        return cls(version, inputs, outputs, locktime, testnet=testnet)


class TxIn:
    def __init__(self, prev_tx, prev_index, script_sig=None, sequence=0xffffffff):
        self.prev_tx = prev_tx
        self.prev_index = prev_index
        if script_sig is None:  # <1>
            self.script_sig = Script()
        else:
            self.script_sig = script_sig
        self.sequence = sequence

    def __repr__(self):
        return ':'.format(
            self.prev_tx.hex(),
            self.prev_index,
        )
    # end::source2[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_input at the start
        return a TxIn object
        '''
        prev_tx = s.read(32)[::-1]
        prev_index = little_endian_to_int(s.read(4))
        script_sig = Script.parse(s)
        sequence = little_endian_to_int(s.read(4))
        return cls(prev_tx, prev_index, script_sig, sequence)


class TxOut:

    def __init__(self, amount, script_pubkey):
        self.amount = amount
        self.script_pubkey = script_pubkey

    def __repr__(self):
        return ':'.format(self.amount, self.script_pubkey)
    # end::source3[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_output at the start
        return a TxOut object
        '''
        amount = little_endian_to_int(s.read(8))
        script_pubkey = Script.parse(s)
        return cls(amount, script_pubkey)
        # amount is an integer in 8 bytes, little endian
        # use Script.parse to get the ScriptPubKey
        # return an instance of the class (see __init__ for args)
        # raise NotImplementedError

    # tag::source4[]
    def serialize(self):  # <1>
        '''Returns the byte serialization of the transaction output'''
        result = int_to_little_endian(self.amount, 8)
        result += self.script_pubkey.serialize()
        return result
    # end::source4[]


if __name__ == '__main__':
    raw_tx = bytes.fromhex('0100000001813f79011acb80925dfe69b3def355fe914bd1d96a3f5f71bf8303c6a989c7d1000000006b483045022100ed81ff192e75a3fd2304004dcadb746fa5e24c5031ccfcf21320b0277457c98f02207a986d955c6e0cb35d446a89d3f56100f4d7f67801c31967743a9c8e10615bed01210349fc4e631e3624a545de3f89f5d8684c7b8138bd94bdd531d2e213bf016b278afeffffff02a135ef01000000001976a914bc3b654dca7e56b04dca18f2566cdaf02e8d9ada88ac99c39800000000001976a9141c4bc762dd5423e332166702cb75f40df79fea1288ac19430600')
    stream = BytesIO(raw_tx)
    tx = Tx.parse(stream)
    # print(tx.tx_ins)
    print(tx.locktime)

运行结果

410393
[Finished in 320ms]

练习5

p95

代码实现

# -*- coding: utf-8 -*-
# @Author: 从化北(喵星人)
# @Date:   2022-01-04 17:06:15
# @Last Modified by:   从化北
# @Last Modified time: 2022-01-04 17:11:16
from helper import little_endian_to_int, read_varint
from io import BytesIO
from script import Script


class Tx:

    def __init__(self, version, tx_ins, tx_outs, locktime, testnet=False):
        self.version = version
        self.tx_ins = tx_ins  #
        self.tx_outs = tx_outs
        self.locktime = locktime
        self.testnet = testnet  #

    @classmethod
    def parse(cls, s, testnet=False):
        '''Takes a byte stream and parses the transaction at the start
        return a Tx object
        '''
        # BytesIO的read会改变游标的位置。但不会更改BytesIO的数据
        version = little_endian_to_int(s.read(4))
        num_inputs = read_varint(s)
        inputs = []
        for _ in range(num_inputs):
            inputs.append(TxIn.parse(s))
        num_outputs = read_varint(s)
        outputs = []
        for _ in range(num_outputs):
            outputs.append(TxOut.parse(s))
        locktime = little_endian_to_int(s.read(4))
        return cls(version, inputs, outputs, locktime, testnet=testnet)


class TxIn:
    def __init__(self, prev_tx, prev_index, script_sig=None, sequence=0xffffffff):
        self.prev_tx = prev_tx
        self.prev_index = prev_index
        if script_sig is None:  # <1>
            self.script_sig = Script()
        else:
            self.script_sig = script_sig
        self.sequence = sequence

    def __repr__(self):
        return ':'.format(
            self.prev_tx.hex(),
            self.prev_index,
        )
    # end::source2[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_input at the start
        return a TxIn object
        '''
        prev_tx = s.read(32)[::-1]
        prev_index = little_endian_to_int(s.read(4))
        script_sig = Script.parse(s)
        sequence = little_endian_to_int(s.read(4))
        return cls(prev_tx, prev_index, script_sig, sequence)


class TxOut:

    def __init__(self, amount, script_pubkey):
        self.amount = amount
        self.script_pubkey = script_pubkey

    def __repr__(self):
        return ':'.format(self.amount, self.script_pubkey)
    # end::source3[]

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses the tx_output at the start
        return a TxOut object
        '''
        amount = little_endian_to_int(s.<
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