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use std::time::{SystemTime, UNIX_EPOCH};
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use sha2::{Sha256, Digest};
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use crate::{utils, proofofwork::ProofOfWork};
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pub struct Block {
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//创建区块的时间戳
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pub time_stamp: i64,
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//存储区块的信息
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pub data: Vec<u8>,
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//上一区块的hash
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pub pre_block_hash: Vec<u8>,
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//当前区块的hash
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pub hash :Vec<u8>,
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//挖矿目标值
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pub nonce: u32,
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}
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impl Block {
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pub(crate) fn new_genesis_block() -> Block {
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let pre_block_hash = vec![];
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Block::new_block_chain("Genesis Block", pre_block_hash)
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}
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pub fn new_block_chain(data :&str, pre_block_hash: Vec<u8>) ->Block {
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let mut block = Block {
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time_stamp: SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs() as i64,
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data: data.as_bytes().to_vec(),
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pre_block_hash,
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hash: Vec::new(),
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nonce: 0,
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};
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//block.set_hash();
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//使用pow方法生成区块的hash值
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let pow = ProofOfWork::new(&block);
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let (nonce, hash) = pow.run();
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block.nonce = nonce;
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block.hash = hash;
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block
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}
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//设置区块的hash值，使用当前的时间戳 上一个区块的hash值，以及区块交易数据来进行创建
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pub fn set_hash(&mut self) {
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//concat change from "hello" "world" to "helloworld"
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let headers: Vec<u8> = vec![&self.time_stamp.to_le_bytes() as &[u8],
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&self.data,
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&self.pre_block_hash
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].concat();
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let mut hasher :Sha256 =Sha256::new();
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hasher.update(headers);
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self.hash = hasher.finalize().to_vec();
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}
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pub fn print_content(&self) {
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println!("Timestamp:{}",self.time_stamp);
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println!("Data:{}", String::from_utf8_lossy(&self.data));
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println!("Previous Block Hash:{}", utils::hex_string(&self.pre_block_hash));
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println!("Hash:{}",utils::hex_string(&self.hash));
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}
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}
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//change byte code to hex string
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