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block.go
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block.go
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package block
import (
"bytes"
"crypto/sha256"
"encoding/gob"
"encoding/hex"
"fmt"
"github.com/kmjayadeep/blockchain-go/transaction"
)
type Block struct {
Hash []byte
Transactions []*transaction.Transaction
PrevHash []byte
Nonce int
}
func CreateBlock(transactions []*transaction.Transaction, prevHash []byte) *Block {
block := &Block{
[]byte{},
transactions,
prevHash,
0,
}
pow := NewProof(block)
nonce, hash := pow.Run()
block.Hash = hash[:]
block.Nonce = nonce
return block
}
func (b *Block) Serialize() ([]byte, error) {
var res bytes.Buffer
encoder := gob.NewEncoder(&res)
err := encoder.Encode(b)
if err != nil {
return nil, err
}
return res.Bytes(), nil
}
func (b *Block) HashString() string {
return hex.EncodeToString(b.Hash)
}
func (b *Block) hashTransactions() []byte {
var txHashes [][]byte
var txHash [32]byte
for _, tx := range b.Transactions {
txHashes = append(txHashes, tx.ID)
}
txHash = sha256.Sum256(bytes.Join(txHashes, []byte{}))
return txHash[:]
}
func (b *Block) String() string {
return fmt.Sprintf("Block - Hash:%x, PrevHash:%x, Transactions:%d, Nonce:%d",
b.Hash,
b.PrevHash,
len(b.Transactions),
b.Nonce,
)
}
func Deserialize(data []byte) (*Block, error) {
var block Block
decoder := gob.NewDecoder(bytes.NewReader(data))
err := decoder.Decode(&block)
if err != nil {
return nil, err
}
return &block, nil
}
func Genesis(coinbase *transaction.Transaction) *Block {
return CreateBlock(
[]*transaction.Transaction{coinbase},
[]byte{})
}