Golang区块链开发001-初始化区块链

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ドル to Bruce", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
  blockChain.AddBlockChain("Send 200ドル to Apple", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
  blockChain.AddBlockChain("Send 300ドル to Alice", blockChain.Blocks[len(blockChain.Blocks)-1].Height+1, blockChain.Blocks[len(blockChain.Blocks)-1].Hash)
  blockChain.AddBlockChain("Send 400ドル 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

本文来自:51CTO博客

感谢作者:暗黑魔君

查看原文:Golang区块链开发001-初始化区块链

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