堕落了一段时间,终于又找回了学习的动力,满血归来。。。
我们知道在如火如荼的区块链应用红海,goLang越来越多地发挥着不可替代的作用。一方面取决于其语法的简单性,一方面其具备C++高效处理的特性。今天,我们就用go语言开始构建一个简单但是具备区块链完整功能的公链项目。
由于之前已经用Python构建过简单的区块链结构,所以对区块基本结构的东西不再做详细赘述。
废话少说上干货
区块Block
Block
type Block struct {
//1.区块高度
Height int64
//2.上一个区块HAsh
PrevBlockHash []byte
//3.交易数据
Data []byte
//4.时间戳
Timestamp int64
//5.Hash
Hash []byte
}
设置当前区块Hash
func (block *Block) SetHash() {
//1.将高度,时间戳转换为字节数组
//base:2 二进制形式
heightBytes := IntToHex(block.Height)
timeStampStr := strconv.FormatInt(block.Timestamp, 2)
timeStamp := []byte(timeStampStr)
//fmt.Println(heightBytes)
//fmt.Println(timeStampStr)
//fmt.Println(timeStamp)
//2.拼接所有属性
blockBytes := bytes.Join([][]byte{
heightBytes,
block.PrevBlockHash,
block.Data,
timeStamp,
block.Hash}, []byte{})
//fmt.Println(blockBytes)
//3.将拼接后的字节数组转换为Hash值
hash := sha256.Sum256(blockBytes)
fmt.Println(hash)
block.Hash = hash[:]
//fmt.Println(block.Hash)
}
创建新区快
func NewBlock(data string, height int64, prevBlockHash []byte) *Block {
//创建区块
block := &Block{
Height: height,
PrevBlockHash: prevBlockHash,
Data: []byte(data),
Timestamp: time.Now().Unix(),
Hash: nil}
//设置HAsh值
block.SetHash()
return block
}
创世区块创建
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})
}
区块链BlockChain
区块链
type Blockchain struct {
//有序区块的数组
Blocks [] *Block
}
创建带有创世区块的区块链
func CreateBlockchainWithGensisBlock() *Blockchain {
gensisBlock := CreateGenesisBlock("Gensis Block...")
return &Blockchain{[] *Block{gensisBlock}}
}
新增一个区块到区块链
func (blc *Blockchain) AddBlockToBlockchain(data string, height int64, prevHash []byte) {
//新建区块
newBlock := NewBlock(data, height, prevHash)
//上链
blc.Blocks = append(blc.Blocks, newBlock)
}
utils辅助工具(int64转化为byte数组)
import (
"bytes"
"encoding/binary"
"log"
)
//将int64转换为bytes
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()
}
测试Demo
/**
@author: chaors
@file: main.go
@time: 2018/06/21 22:01
@desc: 区块信息的示例
*/
package main
import (
"chaors.com/LearnGo/publicChaorsChain/part1-Basic-Prototype/BLC"
"fmt"
)
func main() {
//genesisBlock := BLC.CreateGenesisBlock("Genenis Block")
//创建带有创世区块的区块链
blockchain := BLC.CreateBlockchainWithGensisBlock()
//添加一个新区快
blockchain.AddBlockToBlockchain("first Block",
blockchain.Blocks[len(blockchain.Blocks)-1].Height,
blockchain.Blocks[len(blockchain.Blocks)-1].Hash)
blockchain.AddBlockToBlockchain("second Block",
blockchain.Blocks[len(blockchain.Blocks)-1].Height,
blockchain.Blocks[len(blockchain.Blocks)-1].Hash)
blockchain.AddBlockToBlockchain("third Block",
blockchain.Blocks[len(blockchain.Blocks)-1].Height,
blockchain.Blocks[len(blockchain.Blocks)-1].Hash)
fmt.Println(blockchain)
}
运行结果
我们看到运行的结果,打印的内容为包含创世区块在内的四个区块的区块链。
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互联网颠覆世界,区块链颠覆互联网!
-------------------------------------------------20180622 20:35
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