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• 实现思路：

• 代码

 block.go

package main

import (
	"time"
	"bytes"
	"crypto/sha256"
)

type Block struct {
	//版本
	Version int64
	//前区块的哈希值
	PrevBlockHash []byte
	//当前区块的哈希值，为了简化代码
	Hash []byte
	//梅克尔根
	MerKelRoot []byte
	//时间戳
	TimeStamp int64
	//难度值
	Bits int64
	//随机值
	Nonce int64

	//交易信息
	Data []byte
}

func NewBlock(data string,prevBlockHash []byte) *Block{

	var block Block
	block = Block {
		Version:1,
		PrevBlockHash:prevBlockHash,
		MerKelRoot: []byte{},
		TimeStamp:time.Now().Unix(),
		Bits:1,
		Nonce:1,
		Data:[]byte(data)}
		block.SetHash()
	return &block
}

func (block *Block)SetHash(){
	tmp := [][]byte{
		IntToByte(block.Version),
		block.PrevBlockHash,
		block.MerKelRoot,
		IntToByte(block.TimeStamp),
		IntToByte(block.Bits),
		IntToByte(block.Nonce),
		block.Data}
		data := bytes.Join(tmp,[]byte{})
		hash := sha256.Sum256(data)
		block.Hash = hash[:]
}
func NewGenesisBlock() *Block{
	return NewBlock("Genesis Block",[]byte{})
}

blockChain.go

package main

type BlockChain struct {
	blocks []*Block
}

func NewBlockChain() *BlockChain{
	block := NewGenesisBlock()
	return &BlockChain{blocks:[]*Block{block}}
}

func (bc *BlockChain)AddBlock(data string){
	preBlockHash := bc.blocks[len(bc.blocks)-1].Hash
	block := NewBlock(data,preBlockHash)
	bc.blocks = append(bc.blocks,block)
}

 

utils.go

package main

import (
	"encoding/binary"
	"bytes"
	"os"
	"fmt"
)

func IntToByte(num int64) []byte{
	//func Write(w io.Writer, order ByteOrder, data interface{}) error {

	var buffer bytes.Buffer
	err := binary.Write(&buffer, binary.BigEndian, num)
	CheckErr("IntToBye", err)
	return buffer.Bytes()
}

func CheckErr(pos string, err error)  {
	if err != nil {
		fmt.Println("error , pos :", pos, err)
		os.Exit(1)
	}
}

main.go

package main

import "fmt"

func main(){
	bc := NewBlockChain()
	bc.AddBlock("A send B 1 btc")
	bc.AddBlock("B send C 1 btc")

	for _,block :=range bc.blocks{
		fmt.Printf("version:",block.Version)
		fmt.Printf("preBlockHash",block.PrevBlockHash)
		fmt.Printf("Hsah: %x\n",block.Hash)
		fmt.Printf("data: %s\n",block.Data)
	}
}

 

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