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236 lines
5.1 KiB
236 lines
5.1 KiB
package blocks
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import (
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"bytes"
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"crypto/sha256"
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"errors"
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"io"
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"time"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/merkle"
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)
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var (
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ErrBlockInvalidNetwork = errors.New("Error block invalid network")
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ErrBlockInvalidBlockHeight = errors.New("Error block invalid height")
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ErrBlockInvalidLastBlockHash = errors.New("Error block invalid last blockhash")
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)
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type Block struct {
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Header
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Validation
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Data
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// Volatile
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hash []byte
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}
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func ReadBlock(r io.Reader, n *int64, err *error) *Block {
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return &Block{
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Header: ReadHeader(r, n, err),
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Validation: ReadValidation(r, n, err),
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Data: ReadData(r, n, err),
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}
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}
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func (b *Block) WriteTo(w io.Writer) (n int64, err error) {
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WriteBinary(w, &b.Header, &n, &err)
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WriteBinary(w, &b.Validation, &n, &err)
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WriteBinary(w, &b.Data, &n, &err)
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return
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}
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// Basic validation that doesn't involve state data.
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func (b *Block) ValidateBasic(lastBlockHeight uint32, lastBlockHash []byte) error {
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if b.Header.Network != Config.Network {
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return ErrBlockInvalidNetwork
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}
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if b.Header.Height != lastBlockHeight+1 {
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return ErrBlockInvalidBlockHeight
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}
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if !bytes.Equal(b.Header.LastBlockHash, lastBlockHash) {
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return ErrBlockInvalidLastBlockHash
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}
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// XXX more validation
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return nil
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}
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func (b *Block) Hash() []byte {
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if b.hash != nil {
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return b.hash
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} else {
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hashes := [][]byte{
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b.Header.Hash(),
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b.Validation.Hash(),
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b.Data.Hash(),
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}
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// Merkle hash from sub-hashes.
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return merkle.HashFromHashes(hashes)
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}
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}
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// Convenience.
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// A nil block never hashes to anything.
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// Nothing hashes to a nil hash.
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func (b *Block) HashesTo(hash []byte) bool {
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if len(hash) == 0 {
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return false
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}
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if b == nil {
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return false
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}
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return bytes.Equal(b.Hash(), hash)
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}
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// Makes an empty next block.
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func (b *Block) MakeNextBlock() *Block {
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return &Block{
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Header: Header{
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Network: b.Header.Network,
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Height: b.Header.Height + 1,
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//Fees: uint64(0),
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Time: time.Now(),
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LastBlockHash: b.Hash(),
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//ValidationStateHash: nil,
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//AccountStateHash: nil,
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},
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}
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}
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//-----------------------------------------------------------------------------
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type Header struct {
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Network string
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Height uint32
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Fees uint64
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Time time.Time
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LastBlockHash []byte
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ValidationStateHash []byte
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AccountStateHash []byte
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// Volatile
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hash []byte
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}
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func ReadHeader(r io.Reader, n *int64, err *error) (h Header) {
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if *err != nil {
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return Header{}
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}
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return Header{
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Network: ReadString(r, n, err),
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Height: ReadUInt32(r, n, err),
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Fees: ReadUInt64(r, n, err),
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Time: ReadTime(r, n, err),
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LastBlockHash: ReadByteSlice(r, n, err),
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ValidationStateHash: ReadByteSlice(r, n, err),
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AccountStateHash: ReadByteSlice(r, n, err),
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}
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}
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func (h *Header) WriteTo(w io.Writer) (n int64, err error) {
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WriteString(w, h.Network, &n, &err)
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WriteUInt32(w, h.Height, &n, &err)
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WriteUInt64(w, h.Fees, &n, &err)
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WriteTime(w, h.Time, &n, &err)
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WriteByteSlice(w, h.LastBlockHash, &n, &err)
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WriteByteSlice(w, h.ValidationStateHash, &n, &err)
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WriteByteSlice(w, h.AccountStateHash, &n, &err)
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return
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}
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func (h *Header) Hash() []byte {
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if h.hash != nil {
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return h.hash
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} else {
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hasher := sha256.New()
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_, err := h.WriteTo(hasher)
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if err != nil {
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panic(err)
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}
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h.hash = hasher.Sum(nil)
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return h.hash
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}
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}
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//-----------------------------------------------------------------------------
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type Validation struct {
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Signatures []Signature
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// Volatile
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hash []byte
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}
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func ReadValidation(r io.Reader, n *int64, err *error) Validation {
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numSigs := ReadUInt32(r, n, err)
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sigs := make([]Signature, 0, numSigs)
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for i := uint32(0); i < numSigs; i++ {
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sigs = append(sigs, ReadSignature(r, n, err))
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}
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return Validation{
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Signatures: sigs,
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}
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}
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func (v *Validation) WriteTo(w io.Writer) (n int64, err error) {
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WriteUInt32(w, uint32(len(v.Signatures)), &n, &err)
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for _, sig := range v.Signatures {
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WriteBinary(w, sig, &n, &err)
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}
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return
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}
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func (v *Validation) Hash() []byte {
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if v.hash != nil {
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return v.hash
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} else {
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hasher := sha256.New()
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_, err := v.WriteTo(hasher)
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if err != nil {
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panic(err)
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}
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v.hash = hasher.Sum(nil)
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return v.hash
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}
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}
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//-----------------------------------------------------------------------------
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type Data struct {
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Txs []Tx
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// Volatile
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hash []byte
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}
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func ReadData(r io.Reader, n *int64, err *error) Data {
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numTxs := ReadUInt32(r, n, err)
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txs := make([]Tx, 0, numTxs)
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for i := uint32(0); i < numTxs; i++ {
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txs = append(txs, ReadTx(r, n, err))
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}
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return Data{Txs: txs}
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}
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func (data *Data) WriteTo(w io.Writer) (n int64, err error) {
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WriteUInt32(w, uint32(len(data.Txs)), &n, &err)
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for _, tx := range data.Txs {
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WriteBinary(w, tx, &n, &err)
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}
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return
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}
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func (data *Data) Hash() []byte {
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if data.hash != nil {
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return data.hash
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} else {
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bs := make([]Binary, 0, len(data.Txs))
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for i, tx := range data.Txs {
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bs[i] = Binary(tx)
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}
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data.hash = merkle.HashFromBinaries(bs)
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return data.hash
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}
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}
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