block.go

package main

import "time"
import "bytes"
import "encoding/gob"
import "log"

type Block struct {
	Timestamp     int64
	Transactions  []*Transaction
	PrevBlockHash []byte
	Hash          []byte
	Nonce         int
}

func NewBlock(transactions []*Transaction, prevBlockHash []byte) *Block {
	block := &Block{time.Now().Unix(), transactions, prevBlockHash, []byte{}, 0}
	pow := NewProofOfWork(block)
	nonce, hash := pow.Run()

	block.Hash = hash[:]
	block.Nonce = nonce
	return block
}

func NewGenesisBlock(coinbase *Transaction) *Block {
	return NewBlock([]*Transaction{coinbase}, []byte{})
}

func (b *Block) Serialize() []byte {
	var result bytes.Buffer
	encoder := gob.NewEncoder(&result)

	err := encoder.Encode(b)
	if err != nil {
		log.Panic(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.Panic(err)
	}

	return &block
}