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BlockChain

基于 Go 构建一个区块链 Demo

安装

// 获取项目源码
$ cd $GOPATH/src
$ git clone [email protected]:AustinDeng/BlockChain.git

运行

// 进入目录
$ cd $GOPATH/src/BlockChain

// 执行命令
$ go run ./cmd/main.go

Index: 0
PrevBlockHash:
CurrHash: 0d8845eb2da42f75aef4ee920f644975d73347e0331d17b37209c4f32ef4867f
Data: Geneesis Block
Timestamp: 1539490069

Index: 1
PrevBlockHash: 0d8845eb2da42f75aef4ee920f644975d73347e0331d17b37209c4f32ef4867f
CurrHash: b11305449703848e79f02f0ba7f7db6bdd085a4a5ea50382ea4cca77644c376b
Data: This is the first block.
Timestamp: 1539490069

Index: 2
PrevBlockHash: b11305449703848e79f02f0ba7f7db6bdd085a4a5ea50382ea4cca77644c376b
CurrHash: 751c3793ee3492f5e050c6b662f4d832bc125dde0aae813147e5459abc23f29a
Data: This is the second block.
Timestamp: 1539490069

通过 RPC 接口访问数据

启动服务

// 进入目录
$ cd $GOPATH/src/BlockChain

// 开启http服务监听
$ go run rpc/Server.go

查看数据

打开浏览器输入 URL 地址：http://localhost:8000/blockchain/get

{
    "Block": [
        {
            "Index": 0,
            "TimeStamp": 1539490490,
            "PrevBlockHash": "",
            "Hash": "0d8845eb2da42f75aef4ee920f644975d73347e0331d17b37209c4f32ef4867f",
            "Data": "Genesis Block"
        }
    ]
}

写入区块链数据

打开浏览器输入 URL 地址：http://localhost:8000/blockchain/write?data=This is the first block.

{
    "Block": [
        {
            "Index": 0,
            "TimeStamp": 1539490490,
            "PrevBlockHash": "",
            "Hash": "0d8845eb2da42f75aef4ee920f644975d73347e0331d17b37209c4f32ef4867f",
            "Data": "Genesis Block"
        },
        {
            "Index": 1,
            "TimeStamp": 1539490635,
            "PrevBlockHash": "0d8845eb2da42f75aef4ee920f644975d73347e0331d17b37209c4f32ef4867f",
            "Hash": "b11305449703848e79f02f0ba7f7db6bdd085a4a5ea50382ea4cca77644c376b",
            "Data": "This is the first block."
        }
    ]
}

项目部分源码

区块结构体定义

type Block struct {
	Index int64
	TimeStamp int64
	PrevBlockHash string
	Hash string
	Data string
}

区块链结构体定义

type BlockChain struct {
    Block []*Block
}

计算区块的 Hash 值

func calculateHash(block Block) string {
	data := string(block.Index) + string(block.TimeStamp) + block.PrevBlockHash + block.Data
	blockInBytes := sha256.Sum256([]byte(data))
	return hex.EncodeToString(blockInBytes[:])
}