区块链公链代码

区块链公链

type Block struct {
Index int64
TimeStamp int64
Data []byte
PrevBlockHash []byte
Hash []byte
}

新的block

func NewBlock(index int64,data ,prevBlockHash []byte) *Block {
block :=&Block{index,time.Now().Unix(),data,prevBlockHash,[]byte{}}
block.setHash() //设置当前区块Hash
return block
}

hash计算

func (b *Block)setHash() {
timestamp :=[]byte(strconv.FormatInt(b.TimeStamp,10))
index := []byte(strconv.FormatInt(b.Index,10))
headers :=bytes.Join([][]byte{timestamp,index,b.PrevBlockHash},[]byte{})
hash:=sha256.Sum256(headers)
b.Hash =hash[:] //保存Hash结果在当前块的Hash中
}

创世纪块

func NewGenesisBlock() *Block {
return NewBlock(0,[]byte("first block"),[]byte{})
}

定义区块链

type Blockchain struct {
blocks []*Block
}

添加区块

func NewBlockchain()*Blockchain {
return &Blockchain{[]*Block{NewGenesisBlock()}}
}

创建新区块

func (bc *Blockchain)AddBlock(data string) {
prevBlock :=bc.blocks[len(bc.blocks)-1]
newBlock :=NewBlock(prevBlock.Index+1,[]byte(data),prevBlock.Hash)
bc.blocks =append(bc.blocks,newBlock)
}

主函数

func main(){
bc :=NewBlockchain()
bc.AddBlock("Joy send 1 BTC to Jay")
bc.AddBlock("Jakc sent 2 BTC to Jay")

for _,block := range bc.blocks{
fmt.Printf("Index :%d\n" ,block.Index)
fmt.Printf("TimeStamp: %d\n",block.TimeStamp)
fmt.Printf("Data: %s\n",block.Data)
fmt.Printf("PrevHash: %x\n",block.PrevBlockHash)
fmt.Printf("Hash: %x\n",block.Hash)
fmt.Println("_____________________________")
}

}