一. 代码结构
Block.go :定义区块结构与方法
BlockChain.go :定义区块链结构与方法
help.go :将常用代码块进行封装，形成帮助库
main.go:测试代码
二.定义区块结构与方法
package BLC
import (
"time"
"strconv"
"bytes"
"crypto/sha256"
)
//定义区块
type Block struct {
//1.区块高度，也就是区块的编号，第几个区块
Height int64
//2.上一个区块的Hash值
PreBlockHash []byte
//3.交易数据（最终都属于transaction 事务）
Data []byte
//4.创建时间的时间戳
TimeStamp int64
//5.当前区块的Hash值
Hash []byte
//6.Nonce 随机数，用于验证工作量证明
Nonce int64
}
//定义区块生成Hash的方法
func (block *Block) SetHash() {
//1.将Height 转换为字节数组 []byte
heightBytes := IntToHex(block.Height)
//2.将TimeStamp 转换为字节数组 []byte
//2.1 将Int64的TimeStamp 转换成二进制
timeString := strconv.FormatInt(block.TimeStamp, 2)
//2.2 将二进制字符串转成字节数组
timeBytes := []byte(timeString)
//3.拼接所有属性,形成一个二维的byte数组
blockBytes := bytes.Join([][]byte{heightBytes, block.PreBlockHash, block.Data, timeBytes, block.Hash}, []byte{})
//4.生成Hash
hash := sha256.Sum256(blockBytes)
block.Hash = hash[:]
}
//1. 创建新的区块
func NewBlock(data string, height int64, PreBlockHash []byte) *Block {
//创建区块
block := &Block{
height,
PreBlockHash,
[]byte(data),
time.Now().Unix(),
nil,
0,
}
//设置Hash
block.SetHash()
return block
}
//2.生成创世区块
func CreateGenesisBlock(data string) *Block {
return NewBlock(data, 1, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
}三.定义区块链与方法
package BLC
type BlockChain struct {
Blocks []*Block //存储有序的区块
}
func (blc *BlockChain)AddBlockChain(data string,height int64,preHash []byte){
//创建新区块
newBlock := NewBlock(data,height,preHash)
//往链中添加区块
blc.Blocks=append(blc.Blocks,newBlock)
}
//1.创建带有创世区块的区块链
func CreateBlockChainWithGenesisBlock() *BlockChain {
//创建创世区块
genesisBlock := CreateGenesisBlock("Genesis Data..")
//返回区块链对象
return &BlockChain{[]*Block{genesisBlock}}
}四.帮助代码库
package BLC
import (
"bytes"
"encoding/binary"
"log"
)
//将int64转换为字节数组
func IntToHex(num int64) []byte {
buff := new(bytes.Buffer)
err := binary.Write(buff, binary.BigEndian, num)
if err != nil {
log.Panic(err)
}
return buff.Bytes()
}五.测试代码
package main
import (
"publicChain/BLC"
"fmt"
)
func main() {
//创建创世区块
blockChain := BLC.CreateBlockChainWithGenesisBlock()
//创建新的区块
blockChain.AddBlockChain("Send $100 to Bruce", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
blockChain.AddBlockChain("Send $200 to Apple", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
blockChain.AddBlockChain("Send $300 to Alice", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
blockChain.AddBlockChain("Send $400 to Bob", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
fmt.Printf("创建的区块链为:\t%v\n", blockChain)
fmt.Printf("区块链存储的区块为:\t%v\n", blockChain.Blocks)
fmt.Printf("第二个区块的数据信息(交易信息)为:\t%v\n", string(blockChain.Blocks[1].Data))
}六.结果显示
