Method parse

code-ch13/network.py:274–289

(cls, stream)

    @classmethod
    def parse(cls, stream):
        # number of headers is in a varint
        num_headers = read_varint(stream)
        # initialize the blocks array
        blocks = []
        # loop through number of headers times
        for _ in range(num_headers):
            # add a block to the blocks array by parsing the stream
            blocks.append(Block.parse(stream))
            # read the next varint (num_txs)
            num_txs = read_varint(stream)
            # num_txs should be 0 or raise a RuntimeError
            if num_txs != 0:
                raise RuntimeError('number of txs not 0')
        # return a class instance
        return cls(blocks)


class HeadersMessageTest(TestCase):