94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package bc
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"log"
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"strconv"
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"strings"
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"time"
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)
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// Block represents a block in the blockchain
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type Block struct {
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Timestamp int64
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Transactions []*Transaction
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PrevBlockHash []byte
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Hash []byte
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Nonce int
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Height int
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}
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// NewBlock creates and returns Block
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func NewBlock(transactions []*Transaction, prevBlockHash []byte, height int) *Block {
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block := &Block{time.Now().Unix(), transactions, prevBlockHash, []byte{}, 0, height}
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pow := NewProofOfWork(block)
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nonce, hash := pow.Run()
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block.Hash = hash[:]
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block.Nonce = nonce
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return block
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}
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// NewGenesisBlock creates and returns genesis Block
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func NewGenesisBlock(coinbase *Transaction) *Block {
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return NewBlock([]*Transaction{coinbase}, []byte{}, 0)
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}
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// HashTransactions returns a hash of the transactions in the block
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func (b *Block) HashTransactions() []byte {
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var transactions [][]byte
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for _, tx := range b.Transactions {
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transactions = append(transactions, tx.Serialize())
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}
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mTree := NewMerkleTree(transactions)
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return mTree.RootNode.Data
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}
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// Serialize serializes the block
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func (b *Block) Serialize() []byte {
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var result bytes.Buffer
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encoder := gob.NewEncoder(&result)
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err := encoder.Encode(b)
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if err != nil {
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log.Panic(err)
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}
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return result.Bytes()
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}
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// DeserializeBlock deserializes a block
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func DeserializeBlock(d []byte) *Block {
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var block Block
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decoder := gob.NewDecoder(bytes.NewReader(d))
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err := decoder.Decode(&block)
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if err != nil {
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log.Panic(err)
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}
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return &block
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}
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func (b *Block) PrintHTML(detail bool) string {
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var lines []string
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lines = append(lines, fmt.Sprintf("<h2>Block <a href=\"/block/%x\">%x</a> </h2>", b.Hash, b.Hash))
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lines = append(lines, fmt.Sprintf("Height: %d</br>", b.Height))
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lines = append(lines, fmt.Sprintf("Prev. block: <a href=\"/block/%x\">%x</a></br>", b.PrevBlockHash, b.PrevBlockHash))
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lines = append(lines, fmt.Sprintf("Created at : %s</br>", time.Unix(b.Timestamp, 0)))
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pow := NewProofOfWork(b)
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lines = append(lines, fmt.Sprintf("PoW: %s</br></br>", strconv.FormatBool(pow.Validate())))
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if detail {
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for _, tx := range b.Transactions {
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lines = append(lines, tx.PrintHTML())
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}
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}
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lines = append(lines, fmt.Sprintf("</br></br>"))
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return strings.Join(lines, "\n")
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}
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