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block.go
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block.go
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package blockchain
import (
"bytes"
"crypto/sha256"
"encoding/gob"
"log"
)
//Block is a single unit in the blockchain
type Block struct {
Hash []byte
Transactions []*Transaction
PrevHash []byte
Nonce int
}
//CreateBlock will create a new block, but not add it to the chain
func CreateBlock(txs []*Transaction, prevHash []byte) *Block {
block := &Block{[]byte{}, txs, prevHash, 0}
pow := NewProofOfWork(block)
nonce, hash := pow.Run()
block.Hash = hash[:]
block.Nonce = nonce
return block
}
// Genesis needs to be the first block in a chain, as the first block doesn't have an address to point back to
func Genesis(coinbase *Transaction) *Block {
return CreateBlock([]*Transaction{coinbase}, []byte{})
}
func (bloc *Block) HashTransactions() []byte {
var txHashes [][]byte
var txHash [32]byte
for _, tx := range bloc.Transactions {
txHashes = append(txHashes, tx.ID)
}
txHash = sha256.Sum256(bytes.Join(txHashes, []byte{}))
return txHash[:]
}
func (b *Block) Serialize() []byte {
var res bytes.Buffer
encoder := gob.NewEncoder(&res)
err := encoder.Encode(b)
Handle(err)
return res.Bytes()
}
func Handle(err error) {
if err != nil {
log.Panic(err)
}
}
func Deserialize(data []byte) *Block {
var block Block
decoder := gob.NewDecoder(bytes.NewReader(data))
err := decoder.Decode(&block)
Handle(err)
return &block
}