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block.go
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/
block.go
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package blockchain
import (
"bytes"
"encoding/gob"
"log"
"time"
)
type Block struct {
Timestamp int64
Hash []byte
Transactions []*Transaction
PrevHash []byte
Nonce int
Height int
}
// func (b *Block) DeriveHash() {
// info := bytes.Join([][]byte{b.Data, b.PrevHash}, []byte{})
// hash := sha256.Sum256(info)
// b.Hash = hash[:]
// }
func CreateBlock(txs []*Transaction, prev []byte, height int) *Block {
block := &Block{time.Now().Unix(), []byte{}, txs, prev, 0, height}
pow := NewProof(block)
nonce, hash := pow.Run()
block.Hash = hash[:]
block.Nonce = nonce
return block
}
func Genesis(coinbase *Transaction) *Block {
return CreateBlock([]*Transaction{coinbase}, []byte{}, 0)
}
func (b *Block) Serialize() []byte {
var res bytes.Buffer
encoder := gob.NewEncoder(&res)
err := encoder.Encode(b)
Handle(err)
return res.Bytes()
}
func Deserialize(data []byte) *Block {
var block Block
decoder := gob.NewDecoder(bytes.NewReader(data))
err := decoder.Decode(&block)
Handle(err)
return &block
}
func Handle(err error) {
if err != nil {
log.Panic(err)
}
}
func (b *Block) HashTransactions() []byte {
var txHashes [][]byte
for _, tx := range b.Transactions {
txHashes = append(txHashes, tx.Serialize())
}
tree := NewMerkleTree(txHashes)
return tree.RootNode.Data
}