85 行 Rust 實作一個簡單的區塊鏈
概述
這篇文章只是把之前寫的 C 語言區塊鏈用 Rust 實作了下，并且使用了 md5 作為哈希函式，本文只是為了 Rust 練手，不得不說這語言學起來難但是用起來真爽哈哈哈
區塊鏈 = 由區塊順次連接形成的鏈
Cargo.toml
[dependencies]
chrono = "*"
rust-crypto = "^0.2"
組成
-
區塊
#[derive(Debug)] struct Block { prevHash: String, timeStamp: i64, hash: String, body: String, } -
區塊鏈
struct BlockChain { block: Vec<Block>, height: i64, }
完整代碼
use std::os::unix::raw::time_t;
use chrono::prelude::*;
use crypto::digest::Digest;
use crypto::md5::Md5;
#[derive(Debug)]
struct Block {
prevHash: String,
timeStamp: i64,
hash: String,
body: String,
}
struct BlockChain {
block: Vec<Block>,
height: i64,
}
impl Block {
fn new(prevHash: String, body: String) -> Block {
let timeStamp = Block::timeStamp();
let hash = Block::md5(format!("{}-{}-{}", prevHash, timeStamp, body).as_str());
Block {
prevHash,
timeStamp: timeStamp,
hash: hash,
body,
}
}
fn timeStamp() -> i64 {
(Local::now()).timestamp_millis()
}
fn md5(input: &str) -> String {
let mut md5 = Md5::new();
md5.input_str(input);
md5.result_str()
}
}
impl BlockChain {
// 創建區塊鏈物件時自動創建創世區塊
fn new() -> BlockChain {
let mut blockChain = BlockChain {
block: vec![],
height: 0
};
blockChain.block.push(Block::new(
"c87ffbd5d8dabb535b673c5d1b8197d5".to_string(),
"廣州吳彥祖 - 創世區塊".to_string()
));
blockChain.height += 1;
blockChain
}
fn addBlock(&mut self, prevHash: String, body: String) {
self.block.push(Block::new(
prevHash,
body
));
self.height += 1;
}
}
fn main() {
let mut blockChain = BlockChain::new();
blockChain.addBlock(
"this is block A".to_string(),
"this is Block A data".to_string(),
);
blockChain.addBlock(
"this is block B".to_string(),
"this is Block B data".to_string(),
);
for x in blockChain.block {
println!("{:#?}", x);
}
}
允許結果
Block {
prevHash: "c87ffbd5d8dabb535b673c5d1b8197d5",
timeStamp: 1639814280102,
hash: "33ece6ba97133882800a8dd22ac49a19",
body: "廣州吳彥祖 - 創世區塊",
}
Block {
prevHash: "this is block A",
timeStamp: 1639814280102,
hash: "0565ce1ca7a0adc5a8ec3cad9e7102b4",
body: "this is Block A data",
}
Block {
prevHash: "this is block B",
timeStamp: 1639814280102,
hash: "5774ea1a98ecdd884dd4e58c0168ffa6",
body: "this is Block B data",
}
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標籤：區塊鏈
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