chia 0.1.15

Utility functions and types used by the Chia blockchain full node
Documentation 
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from chia_rs import Spend, SpendBundleConditions, Coin, G1Element, G2Element
import pytest
import copy


coin = b"bcbcbcbcbcbcbcbcbcbcbcbcbcbcbcbc"
ph = b"abababababababababababababababab"
ph2 = b"cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd"
sig = b"abababababababababababababababababababababababab"

def test_hash_spend() -> None:

    a1 = Spend(coin, ph, None, 0, [(ph2, 1000000, None)], [(sig, b"msg")], False)
    a2 = Spend(coin, ph, None, 1, [(ph2, 1000000, None)], [(sig, b"msg")], False)
    b = hash(a1)
    c = hash(a2)
    assert type(b) is int
    assert type(c) is int
    assert b != c

def test_hash_spend_bundle_conditions() -> None:

    a1 = SpendBundleConditions([], 1000, 1337, 42, [(sig, b"msg")], 12345678)
    a2 = SpendBundleConditions([], 1001, 1337, 42, [(sig, b"msg")], 12345678)
    b = hash(a1)
    c = hash(a2)
    assert type(b) is int
    assert type(c) is int
    assert b != c

def test_json_spend() -> None:

    a = Spend(coin, ph, None, 0, [(ph2, 1000000, None)], [(sig, b"msg")], False)

    assert a.to_json_dict() == {
        "coin_id": "0x" + coin.hex(),
        "puzzle_hash": "0x" + ph.hex(),
        "height_relative": None,
        "seconds_relative": 0,
        "create_coin": [["0x" + ph2.hex(), 1000000, None]],
        "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
        "flags": 0,
    }

def test_from_json_spend() -> None:

    a = Spend(coin, ph, None, 0, [(ph2, 1000000, None)], [(sig, b"msg")], False)

    b = Spend.from_json_dict({
        "coin_id": "0x" + coin.hex(),
        "puzzle_hash": "0x" + ph.hex(),
        "height_relative": None,
        "seconds_relative": 0,
        "create_coin": [["0x" + ph2.hex(), 1000000, None]],
        "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
        "flags": 0,
    })
    assert a == b

def test_from_json_spend_set_optional() -> None:

    a = Spend(coin, ph, 1337, 0, [(ph2, 1000000, None)], [(sig, b"msg")], False)

    b = Spend.from_json_dict({
        "coin_id": "0x" + coin.hex(),
        "puzzle_hash": "0x" + ph.hex(),
        "height_relative": 1337,
        "seconds_relative": 0,
        "create_coin": [["0x" + ph2.hex(), 1000000, None]],
        "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
        "flags": 0,
    })
    assert a == b

def test_invalid_hex_prefix() -> None:

    with pytest.raises(ValueError, match="bytes object is expected to start with 0x"):
        a = Spend.from_json_dict({
            # this field is missing the 0x prefix
            "coin_id": coin.hex(),
            "puzzle_hash": "0x" + ph.hex(),
            "height_relative": None,
            "seconds_relative": 0,
            "create_coin": [["0x" + ph2.hex(), 1000000, None]],
            "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
            "flags": 0,
        })

def test_invalid_hex_prefix_bytes() -> None:

    with pytest.raises(ValueError, match="bytes object is expected to start with 0x"):
        a = Spend.from_json_dict({
            "coin_id": "0x" + coin.hex(),
            "puzzle_hash": "0x" + ph.hex(),
            "height_relative": None,
            "seconds_relative": 0,
            "create_coin": [["0x" + ph2.hex(), 1000000, None]],
            # the message field is missing the 0x prefix and is variable length bytes
            "agg_sig_me": [["0x" + sig.hex(), "6d7367"]],
            "flags": 0,
        })

def test_invalid_hex_digit() -> None:

    with pytest.raises(ValueError, match="invalid hex"):
        a = Spend.from_json_dict({
            # this field is has an invalid hex digit (the last one)
            "coin_id": "0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdeg",
            "puzzle_hash": "0x" + ph.hex(),
            "height_relative": None,
            "seconds_relative": 0,
            "create_coin": [["0x" + ph2.hex(), 1000000, None]],
            "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
            "flags": 0,
        })

def test_invalid_hex_length() -> None:

    with pytest.raises(ValueError, match="invalid length 33 expected 32"):
        a = Spend.from_json_dict({
            # this field is has invalid length
            "coin_id": "0x" + coin.hex() + "ff",
            "puzzle_hash": "0x" + ph.hex(),
            "height_relative": None,
            "seconds_relative": 0,
            "create_coin": [["0x" + ph2.hex(), 1000000, None]],
            "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
            "flags": 0,
        })

def test_missing_field() -> None:

    with pytest.raises(KeyError, match="coin_id"):
        a = Spend.from_json_dict({
            # coin_id is missing
            "puzzle_hash": "0x" + ph.hex(),
            "height_relative": None,
            "seconds_relative": 0,
            "create_coin": [["0x" + ph2.hex(), 1000000, None]],
            "agg_sig_me": [["0x" + sig.hex(), "0x6d7367"]],
            "flags": 0,
        })


def test_json_spend_bundle_conditions() -> None:

    a = SpendBundleConditions([], 1000, 1337, 42, [(sig, b"msg")], 12345678)

    assert a.to_json_dict() == {
        "spends": [],
        "reserve_fee": 1000,
        "height_absolute": 1337,
        "seconds_absolute": 42,
        "agg_sig_unsafe": [["0x" + sig.hex(), "0x6d7367"]],
        "cost": 12345678,
    }

def test_from_json_spend_bundle_conditions() -> None:

    a = SpendBundleConditions([], 1000, 1337, 42, [(sig, b"msg")], 12345678)
    b = SpendBundleConditions.from_json_dict({
        "spends": [],
        "reserve_fee": 1000,
        "height_absolute": 1337,
        "seconds_absolute": 42,
        "agg_sig_unsafe": [["0x" + sig.hex(), "0x6d7367"]],
        "cost": 12345678,
    })
    assert a == b


def test_copy_spend() -> None:

    a = Spend(coin, ph, None, 0, [(ph2, 1000000, None)], [(sig, b"msg")], False)
    b = copy.copy(a)

    assert a == b
    assert a is not b

    b = copy.deepcopy(a)
    assert a == b
    assert a is not b

def test_copy_spend_bundle_conditions() -> None:

    a = SpendBundleConditions([], 1000, 1337, 42, [(sig, b"msg")], 12345678)
    b = copy.copy(a)

    assert a == b
    assert a is not b

    b = copy.deepcopy(a)
    assert a == b
    assert a is not b


def coin_roundtrip(c: Coin) -> bool:
    buf = c.to_bytes()
    # make sure c.to_bytes() and bytes(c) are synonyms
    assert buf == bytes(c)
    c2 = Coin.from_bytes(buf)
    return c == c2


def test_coin_serialize() -> None:

    c1 = Coin(coin, ph, 1000000)
    assert c1.to_bytes() == coin + ph + (1000000).to_bytes(8, byteorder="big")
    assert coin_roundtrip(c1)

    c2 = Coin(coin, ph2, 0)
    assert c2.to_bytes() == coin + ph2 + (0).to_bytes(8, byteorder="big")
    assert coin_roundtrip(c2)

    c3 = Coin(coin, ph2, 0xFFFFFFFFFFFFFFFF)
    assert c3.to_bytes() == coin + ph2 + (0xFFFFFFFFFFFFFFFF).to_bytes(
        8, byteorder="big"
    )
    assert coin_roundtrip(c3)


def test_coin_parse_rust() -> None:

    buffer = (
        coin
        + ph2
        + (0xFFFFFFFFFFFFFFFF).to_bytes(8, byteorder="big")
        + b"more bytes following, that should be ignored"
    )

    c1, consumed = Coin.parse_rust(buffer)
    assert buffer[consumed:] == b"more bytes following, that should be ignored"
    assert c1 == Coin(coin, ph2, 0xFFFFFFFFFFFFFFFF)

def sha2(buf: bytes) -> bytes:
    from hashlib import sha256
    ctx = sha256()
    ctx.update(buf)
    return ctx.digest()

def test_coin_get_hash() -> None:

    c1 = Coin(coin, ph, 1000000)
    assert sha2(c1.to_bytes()) == c1.get_hash()

    c2 = Coin(coin, ph2, 0)
    assert sha2(c2.to_bytes()) == c2.get_hash()

    c3 = Coin(coin, ph2, 0xFFFFFFFFFFFFFFFF)
    assert sha2(c3.to_bytes()) == c3.get_hash()

def test_g1_element() -> None:

    a = G1Element(b"abcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwx")
    b = bytes(a)
    assert b == b"abcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwx"
    c = G1Element.from_bytes(b)
    assert a == c

    assert a.to_json_dict() == "0x6162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f707172737475767778"

    d = G1Element.from_json_dict("0x6162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f707172737475767778")
    assert d == a

def test_g2_element() -> None:

    a = G2Element(b"abcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwx")
    b = bytes(a)
    assert b == b"abcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwxabcdefghijklmnopqrstuvwx"
    c = G2Element.from_bytes(b)
    assert a == c

    assert a.to_json_dict() == "0x6162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f707172737475767778"

    d = G2Element.from_json_dict("0x6162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f7071727374757677786162636465666768696a6b6c6d6e6f707172737475767778")
    assert a == d