programmingbitcoin/code-ch09/block.py at master · kprimice/programmingbitcoin · GitHub

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from io import BytesIO
from unittest import TestCase

from helper import (
    bits_to_target,
    double_sha256,
    int_to_little_endian,
    little_endian_to_int,
)


class Block:

    def __init__(self, version, prev_block, merkle_root, timestamp, bits, nonce):
        self.version = version
        self.prev_block = prev_block
        self.merkle_root = merkle_root
        self.timestamp = timestamp
        self.bits = bits
        self.nonce = nonce

    @classmethod
    def parse(cls, s):
        '''Takes a byte stream and parses a block. Returns a Block object'''
        raise NotImplementedError

    def serialize(self):
        '''Returns the 80 byte block header'''
        raise NotImplementedError

    def hash(self):
        '''Returns the double-sha256 interpreted little endian of the block'''
        raise NotImplementedError

    def bip9(self):
        '''Returns whether this block is signaling readiness for BIP9'''
        # BIP9 is signalled if the top 3 bits are 001
        # remember version is 32 bytes so right shift 29 (>> 29) and see if
        # that is 001
        raise NotImplementedError

    def bip91(self):
        '''Returns whether this block is signaling readiness for BIP91'''
        # BIP91 is signalled if the 5th bit from the right is 1
        # shift 4 bits to the right and see if the last bit is 1
        raise NotImplementedError

    def bip141(self):
        '''Returns whether this block is signaling readiness for BIP141'''
        # BIP91 is signalled if the 2nd bit from the right is 1
        # shift 1 bit to the right and see if the last bit is 1
        raise NotImplementedError

    def target(self):
        '''Returns the proof-of-work target based on the bits'''
        return bits_to_target(self.bits)

    def difficulty(self):
        '''Returns the block difficulty based on the bits'''
        raise NotImplementedError

    def check_pow(self):
        '''Returns whether this block satisfies proof of work'''
        raise NotImplementedError


class BlockTest(TestCase):

    def test_parse(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertEqual(block.version, 0x20000002)
        want = bytes.fromhex('000000000000000000fd0c220a0a8c3bc5a7b487e8c8de0dfa2373b12894c38e')
        self.assertEqual(block.prev_block, want)
        want = bytes.fromhex('be258bfd38db61f957315c3f9e9c5e15216857398d50402d5089a8e0fc50075b')
        self.assertEqual(block.merkle_root, want)
        self.assertEqual(block.timestamp, 0x59a7771e)
        self.assertEqual(block.bits, bytes.fromhex('e93c0118'))
        self.assertEqual(block.nonce, bytes.fromhex('a4ffd71d'))

    def test_serialize(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertEqual(block.serialize(), block_raw)

    def test_hash(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertEqual(block.hash(), bytes.fromhex('0000000000000000007e9e4c586439b0cdbe13b1370bdd9435d76a644d047523'))

    def test_bip9(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertTrue(block.bip9())
        block_raw = bytes.fromhex('0400000039fa821848781f027a2e6dfabbf6bda920d9ae61b63400030000000000000000ecae536a304042e3154be0e3e9a8220e5568c3433a9ab49ac4cbb74f8df8e8b0cc2acf569fb9061806652c27')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertFalse(block.bip9())

    def test_bip91(self):
        block_raw = bytes.fromhex('1200002028856ec5bca29cf76980d368b0a163a0bb81fc192951270100000000000000003288f32a2831833c31a25401c52093eb545d28157e200a64b21b3ae8f21c507401877b5935470118144dbfd1')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertTrue(block.bip91())
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertFalse(block.bip91())

    def test_bip141(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertTrue(block.bip141())
        block_raw = bytes.fromhex('0000002066f09203c1cf5ef1531f24ed21b1915ae9abeb691f0d2e0100000000000000003de0976428ce56125351bae62c5b8b8c79d8297c702ea05d60feabb4ed188b59c36fa759e93c0118b74b2618')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertFalse(block.bip141())

    def test_target(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertEqual(block.target(), 0x13ce9000000000000000000000000000000000000000000)

    def test_difficulty(self):
        block_raw = bytes.fromhex('020000208ec39428b17323fa0ddec8e887b4a7c53b8c0a0a220cfd0000000000000000005b0750fce0a889502d40508d39576821155e9c9e3f5c3157f961db38fd8b25be1e77a759e93c0118a4ffd71d')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertEqual(int(block.difficulty()), 888171856257)

    def test_check_pow(self):
        block_raw = bytes.fromhex('04000000fbedbbf0cfdaf278c094f187f2eb987c86a199da22bbb20400000000000000007b7697b29129648fa08b4bcd13c9d5e60abb973a1efac9c8d573c71c807c56c3d6213557faa80518c3737ec1')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertTrue(block.check_pow())
        block_raw = bytes.fromhex('04000000fbedbbf0cfdaf278c094f187f2eb987c86a199da22bbb20400000000000000007b7697b29129648fa08b4bcd13c9d5e60abb973a1efac9c8d573c71c807c56c3d6213557faa80518c3737ec0')
        stream = BytesIO(block_raw)
        block = Block.parse(stream)
        self.assertFalse(block.check_pow())