November 2019
Beginner to intermediate
408 pages
9h 29m
Korean
Content preview from 밑바닥부터 시작하는 비트코인
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밑바닥부터 시작하는 비트코인
142
위 코드에서 비효율적인 부분은 직렬화된 트랜잭션 전체를
parse
메서드의
serialization
인
수로 넘기는 부분입니다. 만약 트랜잭션 전체 크기가 엄청 크다면 이를 다 받을 때까지
parse
메서드를 호출할 수 없는 문제가 생깁니다. 이럴 경우
bytes
형 인수를 쓰지 않고
stream
으로
부터 바로 파싱할 수도 있습니다. 그러면 직렬화된 트랜잭션 전체를 통째로 준비한 다음
parse
메서드를 호출할 필요도 없고 파싱 오류가 있을 때 이를 빨리 발견할 수 있어 더 효율적인 코드
가 됩니다.
stream
을 통한 트랜잭션 파싱 코드는 다음과 같습니다.
class Tx:
...
@classmethod
def parse(cls, stream):
serialized_version = stream.read(4)
➊
...
➊
stream
.
read
메서드로 현재 스트림 버퍼에 있는
4
바이트를 읽어와 파싱을 시작합니다.
즉 필요한
4
바이트만 읽어오기 때문에 직렬화된 트랜잭션 전체가 모일 때까지 기다리지
않습니다.
네트워크의 소켓 통신이나 파일 입출력에서 전체를 다 얻기 위해서는 어느 정도 전송 시간이
필요합니다. 반면, 파싱은 진행하면서 조금씩 데이터를 소모합니다. 따라서 파싱 입력으로 스
트림을 사용하면 데이터를 받는 순간마다 ...
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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.