区块链简单实现

前言

提示：以下是本篇文章正文内容，下面案例可供参考

一、区块链简单实现

package Block

import (
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"strconv"
	"strings"
	"time"
)

type Block struct{
    
    
	PreHash string
	HashCode string
	TimeStamp string
	Diff int
	Data string
	Index int
	Nonce int
}
func GenerateFirstBlock(data string) Block {
    
    
	var firstblock Block
	firstblock.PreHash = "0"
	firstblock.TimeStamp = time.Now().String()
	firstblock.Diff = 4
	firstblock.Data = data
	firstblock.Index = 1
	firstblock.Nonce = 0
	firstblock.HashCode = GenerationHashValue(firstblock)
	return firstblock
}


func GenerationHashValue(block Block) string{
    
    
	var hashdata = strconv.Itoa(block.Nonce)+strconv.Itoa(block.Diff)+strconv.Itoa(block.Index)+block.TimeStamp
	var sha = sha256.New()
	sha.Write([]byte(hashdata))
	hashed := sha.Sum(nil)
	return hex.EncodeToString(hashed)
}


func GenerationNextBlock(data string,oldBlock Block) Block {
    
    
	var newBlock Block
	newBlock.TimeStamp = time.Now().String()
	newBlock.Diff = 4
	newBlock.Index = 2
	newBlock.Data = data
	newBlock.PreHash = oldBlock.HashCode
	newBlock.Nonce = 0

	newBlock.HashCode = pow(newBlock.Diff,&newBlock)

	return newBlock
}

func pow(diff int,block *Block) string{
    
    
	for{
    
    

		hash := GenerationHashValue(*block)
		fmt.Println(hash)
		if strings.HasPrefix(hash, strings.Repeat("0", diff)){
    
    
			//挖矿成功
			fmt.Println("挖矿成功")
			return hash
		} else {
    
    
			//没挖到
			//随机值自增
			block.Nonce++
		}
	}
}

package Blockchain

import (
	"demo2/Block"
	"fmt"
)

type  Node struct {
    
    
	NextNode *Node
	Data *Block.Block
}


func CreateHeaderNode(data *Block.Block) *Node {
    
    

	var headerNode = new(Node)

	headerNode.NextNode = nil

	headerNode.Data=data

	return headerNode

}
func AddNode(data *Block.Block,node *Node) *Node{
    
    
	var newNode = new(Node)

	newNode.NextNode=nil

	newNode.Data=data
	
	node.NextNode = newNode

	return newNode
}

func ShowNodes(node *Node){
    
    

	n := node
	for{
    
    
		if n.NextNode == nil{
    
    
			fmt.Println(n.Data)
			break
		}else{
    
    
			fmt.Println(n.Data)
			n = n.NextNode
		}
	}
}