Python CollationHeader.from_bytes Examples

Example #1

File: shard_tracker.py Project: beneficial02/py-evm

def parse_collation_added_log(log):
    # `shard_id` is the first indexed entry,hence the second entry in topics
    shard_id_bytes32 = log['topics'][1]
    data_bytes = decode_hex(log['data'])
    header_bytes = shard_id_bytes32 + data_bytes[:-64]
    is_new_head = bool(big_endian_to_int(data_bytes[-64:-32]))
    score = big_endian_to_int(data_bytes[-32:])
    collation_header = CollationHeader.from_bytes(header_bytes)
    yield 'header', collation_header
    yield 'is_new_head', is_new_head
    yield 'score', score

Example #2

File: vmc_handler.py Project: tmyk104117/py-evm

def parse_collation_added_log(log):
    # here assume `shard_id` is the first indexed , which is the second element in topics
    shard_id_bytes32 = log['topics'][1]
    data_hex = log['data']
    data_bytes = decode_hex(data_hex)
    score = big_endian_to_int(data_bytes[-32:])
    is_new_head = bool(big_endian_to_int(data_bytes[-64:-32]))
    header_bytes = shard_id_bytes32 + data_bytes[:-64]
    collation_header = CollationHeader.from_bytes(header_bytes)
    yield 'header', collation_header
    yield 'is_new_head', is_new_head
    yield 'score', score

Example #3

File: test_collation_header.py Project: tmyk104117/py-evm

def test_from_bytes_invalid_bytes_length(header_bytes):
    with pytest.raises(ValidationError):
        CollationHeader.from_bytes(header_bytes)

Example #4

File: test_collation_header.py Project: tmyk104117/py-evm

def test_from_bytes_valid_bytes_length(header_bytes, expected_header_dict):
    actual_collation_header = CollationHeader.from_bytes(header_bytes)
    expected_collation_header = CollationHeader(**expected_header_dict)
    assert actual_collation_header == expected_collation_header