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block.go
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block.go
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package coin
import (
"bytes"
"encoding/gob"
"log"
"time"
)
type Block struct {
Timestamp int64
Transactions []*Transaction
PrevBlockHash []byte
Hash []byte
Nonce int
Height int
}
// NewBlock creates and returns Block
func NewBlock(transactions []*Transaction, prevBlockHash []byte, height int) *Block {
block := &Block{time.Now().Unix(), transactions, prevBlockHash, []byte{}, 0, height}
pow := NewProofOfWork(block)
nonce, hash := pow.Run()
block.Hash = hash[:]
block.Nonce = nonce
return block
}
// NewGenesisBlock creates the initial Blockchain block
func NewGenesisBlock(coinbase *Transaction) *Block {
return NewBlock([]*Transaction{coinbase}, []byte{}, 0)
}
// HashTransactions in a block with a Merkle Tree
func (b *Block) HashTransactions() []byte {
var transactions [][]byte
for _, tx := range b.Transactions {
transactions = append(transactions, tx.Serialize())
}
mTree := NewMerkleTree(transactions)
return mTree.RootNode.Data
}
// Serialize a block
func (b *Block) Serialize() []byte {
var result bytes.Buffer
encoder := gob.NewEncoder(&result)
err := encoder.Encode(b)
if err != nil {
log.Fatal(err)
}
return result.Bytes()
}
func DeserializeBlock(d []byte) *Block {
var block Block
decoder := gob.NewDecoder(bytes.NewReader(d))
err := decoder.Decode(&block)
if err != nil {
log.Fatal(err)
}
return &block
}