November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
268
➊ 여기서는 블록 헤더 그룹이
1
개라고 가정하겠습니다. 보다 실전에 가까운 구현으로
2
개
이상의 블록 그룹을 다룰 수 있지만 여기서는
1
개 그룹을 사용해서 블록 헤더를 가져오겠
습니다.
➋ 시작 블록이 주어지지 않으면 적절한 메시지를 생성할 수 없습니다.
➌ 마지막 블록이 주어지지 않으면
0x00
바이트로 채우며 상대 노드는 최대한 많이 보내게
됩니다.
연습문제
10.6
GetHeadersMessage
클래스의
serialize
메서드를 작성하시오.
10.6
블록 헤더 응답
지금까지 논의한 내용으로부터 노드를 생성하고 핸드셰이크로 다른 노드와 연결하여 원하는
블록 헤더까지 요청할 수 있게 되었습니다.
>>> from io import BytesIO
>>> from block import Block, GENESIS_BLOCK
>>> from network import SimpleNode, GetHeadersMessage
>>> node = SimpleNode('mainnet.programmingbitcoin.com', testnet=False)
>>> node.handshake()
>>> genesis = Block.parse(BytesIO(GENESIS_BLOCK))
>>> getheaders = GetHeadersMessage
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.