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package types
import (
"bytes"
"errors"
"fmt"
"io"
"strings"
"time"
. "github.com/tendermint/go-common"
"github.com/tendermint/go-merkle"
"github.com/tendermint/go-wire"
)
const MaxBlockSize = 22020096 // 21MB TODO make it configurable
type Block struct {
*Header `json:"header"`
*Data `json:"data"`
LastCommit *Commit `json:"last_commit"`
}
// TODO: version
func MakeBlock(height int, chainID string, txs []Tx, commit *Commit,
prevBlockID BlockID, valHash, appHash []byte, partSize int) (*Block, *PartSet) {
block := &Block{
Header: &Header{
ChainID: chainID,
Height: height,
Time: time.Now(),
NumTxs: len(txs),
LastBlockID: prevBlockID,
ValidatorsHash: valHash,
AppHash: appHash, // state merkle root of txs from the previous block.
},
LastCommit: commit,
Data: &Data{
Txs: txs,
},
}
block.FillHeader()
return block, block.MakePartSet(partSize)
}
// Basic validation that doesn't involve state data.
func (b *Block) ValidateBasic(chainID string, lastBlockHeight int, lastBlockID BlockID,
lastBlockTime time.Time, appHash []byte) error {
if b.ChainID != chainID {
return errors.New(Fmt("Wrong Block.Header.ChainID. Expected %v, got %v", chainID, b.ChainID))
}
if b.Height != lastBlockHeight+1 {
return errors.New(Fmt("Wrong Block.Header.Height. Expected %v, got %v", lastBlockHeight+1, b.Height))
}
/* TODO: Determine bounds for Time
See blockchain/reactor "stopSyncingDurationMinutes"
if !b.Time.After(lastBlockTime) {
return errors.New("Invalid Block.Header.Time")
}
*/
if b.NumTxs != len(b.Data.Txs) {
return errors.New(Fmt("Wrong Block.Header.NumTxs. Expected %v, got %v", len(b.Data.Txs), b.NumTxs))
}
if !b.LastBlockID.Equals(lastBlockID) {
return errors.New(Fmt("Wrong Block.Header.LastBlockID. Expected %v, got %v", lastBlockID, b.LastBlockID))
}
if !bytes.Equal(b.LastCommitHash, b.LastCommit.Hash()) {
return errors.New(Fmt("Wrong Block.Header.LastCommitHash. Expected %X, got %X", b.LastCommitHash, b.LastCommit.Hash()))
}
if b.Header.Height != 1 {
if err := b.LastCommit.ValidateBasic(); err != nil {
return err
}
}
if !bytes.Equal(b.DataHash, b.Data.Hash()) {
return errors.New(Fmt("Wrong Block.Header.DataHash. Expected %X, got %X", b.DataHash, b.Data.Hash()))
}
if !bytes.Equal(b.AppHash, appHash) {
return errors.New(Fmt("Wrong Block.Header.AppHash. Expected %X, got %X", appHash, b.AppHash))
}
// NOTE: the AppHash and ValidatorsHash are validated later.
return nil
}
func (b *Block) FillHeader() {
if b.LastCommitHash == nil {
b.LastCommitHash = b.LastCommit.Hash()
}
if b.DataHash == nil {
b.DataHash = b.Data.Hash()
}
}
// Computes and returns the block hash.
// If the block is incomplete, block hash is nil for safety.
func (b *Block) Hash() []byte {
// fmt.Println(">>", b.Data)
if b.Header == nil || b.Data == nil || b.LastCommit == nil {
return nil
}
b.FillHeader()
return b.Header.Hash()
}
func (b *Block) MakePartSet(partSize int) *PartSet {
return NewPartSetFromData(wire.BinaryBytes(b), partSize)
}
// 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.LastCommit.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"`
NumTxs int `json:"num_txs"` // XXX: Can we get rid of this?
LastBlockID BlockID `json:"last_block_id"`
LastCommitHash []byte `json:"last_commit_hash"` // commit from validators from the last block
DataHash []byte `json:"data_hash"` // transactions
ValidatorsHash []byte `json:"validators_hash"` // validators for the current block
AppHash []byte `json:"app_hash"` // state after txs from the previous block
}
// NOTE: hash is nil if required fields are missing.
func (h *Header) Hash() []byte {
if len(h.ValidatorsHash) == 0 {
return nil
}
return merkle.SimpleHashFromMap(map[string]interface{}{
"ChainID": h.ChainID,
"Height": h.Height,
"Time": h.Time,
"NumTxs": h.NumTxs,
"LastBlockID": h.LastBlockID,
"LastCommit": h.LastCommitHash,
"Data": h.DataHash,
"Validators": h.ValidatorsHash,
"App": h.AppHash,
})
}
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 NumTxs: %v
%s LastBlockID: %v
%s LastCommit: %X
%s Data: %X
%s Validators: %X
%s App: %X
%s}#%X`,
indent, h.ChainID,
indent, h.Height,
indent, h.Time,
indent, h.NumTxs,
indent, h.LastBlockID,
indent, h.LastCommitHash,
indent, h.DataHash,
indent, h.ValidatorsHash,
indent, h.AppHash,
indent, h.Hash())
}
//-------------------------------------
// NOTE: Commit is empty for height 1, but never nil.
type Commit 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.
BlockID BlockID `json:"blockID"`
Precommits []*Vote `json:"precommits"`
// Volatile
firstPrecommit *Vote
hash []byte
bitArray *BitArray
}
func (commit *Commit) FirstPrecommit() *Vote {
if len(commit.Precommits) == 0 {
return nil
}
if commit.firstPrecommit != nil {
return commit.firstPrecommit
}
for _, precommit := range commit.Precommits {
if precommit != nil {
commit.firstPrecommit = precommit
return precommit
}
}
return nil
}
func (commit *Commit) Height() int {
if len(commit.Precommits) == 0 {
return 0
}
return commit.FirstPrecommit().Height
}
func (commit *Commit) Round() int {
if len(commit.Precommits) == 0 {
return 0
}
return commit.FirstPrecommit().Round
}
func (commit *Commit) Type() byte {
return VoteTypePrecommit
}
func (commit *Commit) Size() int {
if commit == nil {
return 0
}
return len(commit.Precommits)
}
func (commit *Commit) BitArray() *BitArray {
if commit.bitArray == nil {
commit.bitArray = NewBitArray(len(commit.Precommits))
for i, precommit := range commit.Precommits {
commit.bitArray.SetIndex(i, precommit != nil)
}
}
return commit.bitArray.Copy()
}
func (commit *Commit) GetByIndex(index int) *Vote {
return commit.Precommits[index]
}
func (commit *Commit) IsCommit() bool {
if len(commit.Precommits) == 0 {
return false
}
return true
}
func (commit *Commit) ValidateBasic() error {
if commit.BlockID.IsZero() {
return errors.New("Commit cannot be for nil block")
}
if len(commit.Precommits) == 0 {
return errors.New("No precommits in commit")
}
height, round := commit.Height(), commit.Round()
// validate the precommits
for _, precommit := range commit.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 commit vote. Expected precommit, got %v",
precommit.Type)
}
// Ensure that all heights are the same
if precommit.Height != height {
return fmt.Errorf("Invalid commit precommit height. Expected %v, got %v",
height, precommit.Height)
}
// Ensure that all rounds are the same
if precommit.Round != round {
return fmt.Errorf("Invalid commit precommit round. Expected %v, got %v",
round, precommit.Round)
}
}
return nil
}
func (commit *Commit) Hash() []byte {
if commit.hash == nil {
bs := make([]interface{}, len(commit.Precommits))
for i, precommit := range commit.Precommits {
bs[i] = precommit
}
commit.hash = merkle.SimpleHashFromBinaries(bs)
}
return commit.hash
}
func (commit *Commit) StringIndented(indent string) string {
if commit == nil {
return "nil-Commit"
}
precommitStrings := make([]string, len(commit.Precommits))
for i, precommit := range commit.Precommits {
precommitStrings[i] = precommit.String()
}
return fmt.Sprintf(`Commit{
%s BlockID: %v
%s Precommits: %v
%s}#%X`,
indent, commit.BlockID,
indent, strings.Join(precommitStrings, "\n"+indent+" "),
indent, commit.hash)
}
//-----------------------------------------------------------------------------
type Data struct {
// Txs that will be applied by state @ block.Height+1.
// NOTE: not all txs here are valid. We're just agreeing on the order first.
// This means that block.AppHash does not include these txs.
Txs Txs `json:"txs"`
// Volatile
hash []byte
}
func (data *Data) Hash() []byte {
if data.hash == nil {
data.hash = data.Txs.Hash() // NOTE: leaves of merkle tree are TxIDs
}
return data.hash
}
func (data *Data) StringIndented(indent string) string {
if data == nil {
return "nil-Data"
}
txStrings := make([]string, MinInt(len(data.Txs), 21))
for i, tx := range data.Txs {
if i == 20 {
txStrings[i] = fmt.Sprintf("... (%v total)", len(data.Txs))
break
}
txStrings[i] = fmt.Sprintf("Tx:%v", tx)
}
return fmt.Sprintf(`Data{
%s %v
%s}#%X`,
indent, strings.Join(txStrings, "\n"+indent+" "),
indent, data.hash)
}
//--------------------------------------------------------------------------------
type BlockID struct {
Hash []byte `json:"hash"`
PartsHeader PartSetHeader `json:"parts"`
}
func (blockID BlockID) IsZero() bool {
return len(blockID.Hash) == 0 && blockID.PartsHeader.IsZero()
}
func (blockID BlockID) Equals(other BlockID) bool {
return bytes.Equal(blockID.Hash, other.Hash) &&
blockID.PartsHeader.Equals(other.PartsHeader)
}
func (blockID BlockID) Key() string {
return string(blockID.Hash) + string(wire.BinaryBytes(blockID.PartsHeader))
}
func (blockID BlockID) WriteSignBytes(w io.Writer, n *int, err *error) {
if blockID.IsZero() {
wire.WriteTo([]byte("null"), w, n, err)
} else {
wire.WriteTo([]byte(Fmt(`{"hash":"%X","parts":`, blockID.Hash)), w, n, err)
blockID.PartsHeader.WriteSignBytes(w, n, err)
wire.WriteTo([]byte("}"), w, n, err)
}
}
func (blockID BlockID) String() string {
return fmt.Sprintf(`%X:%v`, blockID.Hash, blockID.PartsHeader)
}