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package types
import (
"bytes"
"crypto/sha256"
"errors"
"fmt"
"strings"
"time"
"github.com/tendermint/tendermint/account"
"github.com/tendermint/tendermint/binary"
. "github.com/tendermint/tendermint/common"
"github.com/tendermint/tendermint/merkle"
)
type Block struct {
*Header `json:"header"`
*Data `json:"data"`
LastValidation *Validation `json:"last_validation"`
}
// Basic validation that doesn't involve state data.
func (b *Block) ValidateBasic(chainID string, lastBlockHeight int, lastBlockHash []byte,
lastBlockParts PartSetHeader, lastBlockTime time.Time) error {
if b.ChainID != chainID {
return errors.New("Wrong Block.Header.ChainID")
}
if b.Height != lastBlockHeight+1 {
return errors.New("Wrong Block.Header.Height")
}
if b.NumTxs != len(b.Data.Txs) {
return errors.New("Wrong Block.Header.NumTxs")
}
if !bytes.Equal(b.LastBlockHash, lastBlockHash) {
return errors.New("Wrong Block.Header.LastBlockHash")
}
if !b.LastBlockParts.Equals(lastBlockParts) {
return errors.New("Wrong Block.Header.LastBlockParts")
}
/* TODO: Determine bounds
See blockchain/reactor "stopSyncingDurationMinutes"
if !b.Time.After(lastBlockTime) {
return errors.New("Invalid Block.Header.Time")
}
*/
if b.Header.Height != 1 {
if err := b.LastValidation.ValidateBasic(); err != nil {
return err
}
}
// XXX more validation
return nil
}
// Computes and returns the block hash.
// If the block is incomplete (e.g. missing Header.StateHash)
// then the hash is nil, to prevent the usage of that hash.
func (b *Block) Hash() []byte {
if b.Header == nil || b.Data == nil || b.LastValidation == nil {
return nil
}
hashHeader := b.Header.Hash()
hashData := b.Data.Hash()
hashLastValidation := b.LastValidation.Hash()
// If hashHeader is nil, required fields are missing.
if len(hashHeader) == 0 {
return nil
}
// Merkle hash from subhashes.
hashes := [][]byte{hashHeader, hashData, hashLastValidation}
return merkle.SimpleHashFromHashes(hashes)
}
func (b *Block) MakePartSet() *PartSet {
return NewPartSetFromData(binary.BinaryBytes(b))
}
// Convenience.
// A nil block never hashes to anything.
// Nothing hashes to a nil hash.
func (b *Block) HashesTo(hash []byte) bool {
if len(hash) == 0 {
return false
}
if b == nil {
return false
}
return bytes.Equal(b.Hash(), hash)
}
func (b *Block) String() string {
return b.StringIndented("")
}
func (b *Block) StringIndented(indent string) string {
if b == nil {
return "nil-Block"
}
return fmt.Sprintf(`Block{
%s %v
%s %v
%s %v
%s}#%X`,
indent, b.Header.StringIndented(indent+" "),
indent, b.Data.StringIndented(indent+" "),
indent, b.LastValidation.StringIndented(indent+" "),
indent, b.Hash())
}
func (b *Block) StringShort() string {
if b == nil {
return "nil-Block"
} else {
return fmt.Sprintf("Block#%X", b.Hash())
}
}
//-----------------------------------------------------------------------------
type Header struct {
ChainID string `json:"chain_id"`
Height int `json:"height"`
Time time.Time `json:"time"`
Fees int64 `json:"fees"`
NumTxs int `json:"num_txs"`
LastBlockHash []byte `json:"last_block_hash"`
LastBlockParts PartSetHeader `json:"last_block_parts"`
StateHash []byte `json:"state_hash"`
}
// NOTE: hash is nil if required fields are missing.
func (h *Header) Hash() []byte {
if len(h.StateHash) == 0 {
return nil
}
buf := new(bytes.Buffer)
hasher, n, err := sha256.New(), new(int64), new(error)
binary.WriteBinary(h, buf, n, err)
if *err != nil {
panic(err)
}
hasher.Write(buf.Bytes())
hash := hasher.Sum(nil)
return hash
}
func (h *Header) StringIndented(indent string) string {
if h == nil {
return "nil-Header"
}
return fmt.Sprintf(`Header{
%s ChainID: %v
%s Height: %v
%s Time: %v
%s Fees: %v
%s NumTxs: %v
%s LastBlockHash: %X
%s LastBlockParts: %v
%s StateHash: %X
%s}#%X`,
indent, h.ChainID,
indent, h.Height,
indent, h.Time,
indent, h.Fees,
indent, h.NumTxs,
indent, h.LastBlockHash,
indent, h.LastBlockParts,
indent, h.StateHash,
indent, h.Hash())
}
//-------------------------------------
// NOTE: Validation is empty for height 1, but never nil.
type Validation struct {
// NOTE: The Precommits are in order of address to preserve the bonded ValidatorSet order.
// Any peer with a block can gossip precommits by index with a peer without recalculating the
// active ValidatorSet.
Precommits []*Vote `json:"precommits"`
// Volatile
firstPrecommit *Vote
hash []byte
bitArray *BitArray
}
func (v *Validation) FirstPrecommit() *Vote {
if len(v.Precommits) == 0 {
return nil
}
if v.firstPrecommit != nil {
return v.firstPrecommit
}
for _, precommit := range v.Precommits {
if precommit != nil {
v.firstPrecommit = precommit
return precommit
}
}
return nil
}
func (v *Validation) Height() int {
if len(v.Precommits) == 0 {
return 0
}
return v.FirstPrecommit().Height
}
func (v *Validation) Round() int {
if len(v.Precommits) == 0 {
return 0
}
return v.FirstPrecommit().Round
}
func (v *Validation) ValidateBasic() error {
if len(v.Precommits) == 0 {
return errors.New("No precommits in validation")
}
height, round := v.Height(), v.Round()
for _, precommit := range v.Precommits {
// It's OK for precommits to be missing.
if precommit == nil {
continue
}
// Ensure that all votes are precommits
if precommit.Type != VoteTypePrecommit {
return fmt.Errorf("Invalid validation vote. Expected precommit, got %v",
precommit.Type)
}
// Ensure that all heights are the same
if precommit.Height != height {
return fmt.Errorf("Invalid validation precommit height. Expected %v, got %v",
height, precommit.Height)
}
// Ensure that all rounds are the same
if precommit.Round != round {
return fmt.Errorf("Invalid validation precommit round. Expected %v, got %v",
round, precommit.Round)
}
}
return nil
}
func (v *Validation) Hash() []byte {
if v.hash == nil {
bs := make([]interface{}, len(v.Precommits))
for i, precommit := range v.Precommits {
bs[i] = precommit
}
v.hash = merkle.SimpleHashFromBinaries(bs)
}
return v.hash
}
func (v *Validation) StringIndented(indent string) string {
if v == nil {
return "nil-Validation"
}
precommitStrings := make([]string, len(v.Precommits))
for i, precommit := range v.Precommits {
precommitStrings[i] = precommit.String()
}
return fmt.Sprintf(`Validation{
%s Precommits: %v
%s}#%X`,
indent, strings.Join(precommitStrings, "\n"+indent+" "),
indent, v.hash)
}
func (v *Validation) BitArray() *BitArray {
if v.bitArray == nil {
v.bitArray = NewBitArray(len(v.Precommits))
for i, precommit := range v.Precommits {
v.bitArray.SetIndex(i, precommit != nil)
}
}
return v.bitArray
}
//-----------------------------------------------------------------------------
type Data struct {
Txs []Tx `json:"txs"`
// Volatile
hash []byte
}
func (data *Data) Hash() []byte {
if data.hash == nil {
bs := make([]interface{}, len(data.Txs))
for i, tx := range data.Txs {
bs[i] = account.SignBytes(config.GetString("chain_id"), tx)
}
data.hash = merkle.SimpleHashFromBinaries(bs)
}
return data.hash
}
func (data *Data) StringIndented(indent string) string {
if data == nil {
return "nil-Data"
}
txStrings := make([]string, len(data.Txs))
for i, tx := range data.Txs {
txStrings[i] = fmt.Sprintf("Tx:%v", tx)
}
return fmt.Sprintf(`Data{
%s %v
%s}#%X`,
indent, strings.Join(txStrings, "\n"+indent+" "),
indent, data.hash)
}