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package block
import (
"Chain/pkg/pro"
"crypto/sha256"
"fmt"
"google.golang.org/protobuf/proto"
)
// Header provides information about the Block.
// Version is the Block's version.
// PreviousHash is the hash of the previous Block.
// MerkleRoot is the hash of all the Block's Transactions.
// DifficultyTarget is the difficulty of achieving a winning Nonce.
// Nonce is a "number only used once" that satisfies the DifficultyTarget.
// Timestamp is when the Block was successfully mined.
type Header struct {
Version uint32
PreviousHash string
MerkleRoot string
DifficultyTarget string
Nonce uint32
Timestamp uint32
}
// Block includes a Header and a slice of Transactions.
type Block struct {
Header *Header
Transactions []*Transaction
}
// EncodeHeader returns a pro.Header given a Header.
func EncodeHeader(header *Header) *pro.Header {
return &pro.Header{
Version: header.Version,
PreviousHash: header.PreviousHash,
MerkleRoot: header.MerkleRoot,
DifficultyTarget: header.DifficultyTarget,
Nonce: header.Nonce,
Timestamp: header.Timestamp,
}
}
// DecodeHeader returns a Header given a pro.Header.
func DecodeHeader(pheader *pro.Header) *Header {
return &Header{
Version: pheader.GetVersion(),
PreviousHash: pheader.GetPreviousHash(),
MerkleRoot: pheader.GetMerkleRoot(),
DifficultyTarget: pheader.GetDifficultyTarget(),
Nonce: pheader.GetNonce(),
Timestamp: pheader.GetTimestamp(),
}
}
// EncodeBlock returns a pro.Block given a Block.
func EncodeBlock(b *Block) *pro.Block {
var ptxs []*pro.Transaction
for _, tx := range b.Transactions {
ptxs = append(ptxs, EncodeTransaction(tx))
}
return &pro.Block{
Header: EncodeHeader(b.Header),
Transactions: ptxs,
}
}
// DecodeBlock returns a Block given a pro.Block.
func DecodeBlock(pb *pro.Block) *Block {
var txs []*Transaction
for _, ptx := range pb.GetTransactions() {
txs = append(txs, DecodeTransaction(ptx))
}
return &Block{
Header: DecodeHeader(pb.GetHeader()),
Transactions: txs,
}
}
// Hash returns the hash of the block (which is done via the header)
func (block *Block) Hash() string {
h := sha256.New()
pb := EncodeHeader(block.Header)
bytes, err := proto.Marshal(pb)
if err != nil {
fmt.Errorf("[block.Hash()] Unable to marshal block")
}
h.Write(bytes)
return fmt.Sprintf("%x", h.Sum(nil))
}
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