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| package main
import (
"strconv"
"time"
"crypto/sha256"
"strings"
"encoding/hex"
"fmt"
)
//pow 挖矿算法
//定义难度系数
大专栏 共识算法POW原理及实现">const difiiculty = 4
type Block struct {
Index int // 区块高度
TimeStamp int64
Data string //交易记录
Hash string
Prehash string
Nonce int
Difficulty int //难度系数
}
//创建区块链
var BlockChain []Block
//创世区块
func GenesisBlock() *Block {
var geneBlock = Block{0, time.Now().Unix(), "", "", "", 0, difiiculty}
geneBlock.Hash = hex.EncodeToString(BlockHash(geneBlock))
return &geneBlock
}
func BlockHash(block Block) []byte {
re := strconv.Itoa(block.Index) + strconv.Itoa(int(block.TimeStamp)) + block.Data + block.Prehash +
strconv.Itoa(block.Nonce) + strconv.Itoa(block.Difficulty)
h := sha256.New()
h.Write([]byte(re))
hashed := h.Sum(nil)
return hashed
}
func isBlockValid(block Block) bool {
prefix := strings.Repeat("0", block.Difficulty)
return strings.HasPrefix(block.Hash, prefix)
}
//创建新区块 pow挖矿
func CreateNewBlock(lastBlock *Block, data string) *Block {
var newBlock Block
newBlock.Index = lastBlock.Index + 1
newBlock.TimeStamp = time.Now().Unix()
newBlock.Data = data
newBlock.Prehash = lastBlock.Hash
newBlock.Difficulty = difiiculty
newBlock.Nonce = 0
//开挖-当前区块的hash值的前面的0的个数与难度系数值相同
for {
//计算hash
cuhash := hex.EncodeToString(BlockHash(newBlock))
fmt.Println("挖矿中",cuhash)
newBlock.Hash = cuhash
if isBlockValid(newBlock) {
//校验区块
if VerflyBlock(newBlock, *lastBlock) {
fmt.Println("挖矿成功")
return &newBlock
}
}
newBlock.Nonce ++
}
}
//校验新的区块是否合法
func VerflyBlock(newblock Block, lastBlock Block) bool {
if lastBlock.Index +1 !=newblock.Index {
return false
}
if newblock.Prehash !=lastBlock.Hash {
return false
}
return true
}
func main() {
var genBlock = GenesisBlock()
newBlock := CreateNewBlock(genBlock,"新区块")
fmt.Println(newBlock)
}
|