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300 lines
6.8 KiB
300 lines
6.8 KiB
package types
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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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"fmt"
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"strings"
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"time"
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"github.com/tendermint/tendermint/account"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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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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type Block struct {
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*Header
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*Validation
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*Data
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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 uint, lastBlockHash []byte,
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lastBlockParts PartSetHeader, lastBlockTime time.Time) error {
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if b.Network != config.App().GetString("Network") {
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return errors.New("Wrong Block.Header.Network")
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}
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if b.Height != lastBlockHeight+1 {
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return errors.New("Wrong Block.Header.Height")
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}
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if b.NumTxs != uint(len(b.Data.Txs)) {
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return errors.New("Wrong Block.Header.NumTxs")
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}
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if !bytes.Equal(b.LastBlockHash, lastBlockHash) {
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return errors.New("Wrong Block.Header.LastBlockHash")
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}
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if !b.LastBlockParts.Equals(lastBlockParts) {
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return errors.New("Wrong Block.Header.LastBlockParts")
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}
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/* TODO: Determine bounds
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See blockchain/reactor "stopSyncingDurationMinutes"
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if !b.Time.After(lastBlockTime) {
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return errors.New("Invalid Block.Header.Time")
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}
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*/
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if b.Header.Height != 1 {
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if err := b.Validation.ValidateBasic(); err != nil {
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return err
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}
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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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// Computes and returns the block hash.
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// If the block is incomplete (e.g. missing Header.StateHash)
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// then the hash is nil, to prevent the usage of that hash.
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func (b *Block) Hash() []byte {
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if b.Header == nil || b.Validation == nil || b.Data == nil {
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return nil
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}
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hashHeader := b.Header.Hash()
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hashValidation := b.Validation.Hash()
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hashData := b.Data.Hash()
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// If hashHeader is nil, required fields are missing.
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if len(hashHeader) == 0 {
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return nil
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}
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// Merkle hash from subhashes.
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hashes := [][]byte{hashHeader, hashValidation, hashData}
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return merkle.HashFromHashes(hashes)
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}
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func (b *Block) MakePartSet() *PartSet {
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return NewPartSetFromData(binary.BinaryBytes(b))
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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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func (b *Block) String() string {
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return b.StringIndented("")
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}
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func (b *Block) StringIndented(indent string) string {
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if b == nil {
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return "nil-Block"
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}
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return fmt.Sprintf(`Block{
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%s %v
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%s %v
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%s %v
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%s}#%X`,
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indent, b.Header.StringIndented(indent+" "),
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indent, b.Validation.StringIndented(indent+" "),
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indent, b.Data.StringIndented(indent+" "),
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indent, b.Hash())
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}
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func (b *Block) StringShort() string {
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if b == nil {
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return "nil-Block"
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} else {
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return fmt.Sprintf("Block#%X", b.Hash())
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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 uint
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Time time.Time
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Fees uint64
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NumTxs uint
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LastBlockHash []byte
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LastBlockParts PartSetHeader
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StateHash []byte
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}
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// NOTE: hash is nil if required fields are missing.
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func (h *Header) Hash() []byte {
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if len(h.StateHash) == 0 {
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return nil
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}
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buf := new(bytes.Buffer)
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hasher, n, err := sha256.New(), new(int64), new(error)
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binary.WriteBinary(h, buf, n, err)
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if *err != nil {
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panic(err)
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}
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hasher.Write(buf.Bytes())
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hash := hasher.Sum(nil)
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return hash
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}
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func (h *Header) StringIndented(indent string) string {
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if h == nil {
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return "nil-Header"
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}
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return fmt.Sprintf(`Header{
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%s Network: %v
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%s Height: %v
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%s Time: %v
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%s Fees: %v
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%s NumTxs: %v
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%s LastBlockHash: %X
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%s LastBlockParts: %v
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%s StateHash: %X
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%s}#%X`,
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indent, h.Network,
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indent, h.Height,
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indent, h.Time,
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indent, h.Fees,
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indent, h.NumTxs,
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indent, h.LastBlockHash,
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indent, h.LastBlockParts,
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indent, h.StateHash,
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indent, h.Hash())
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}
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//-----------------------------------------------------------------------------
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type Commit struct {
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Address []byte
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Round uint
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Signature account.SignatureEd25519
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}
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func (commit Commit) IsZero() bool {
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return commit.Round == 0 && commit.Signature.IsZero()
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}
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func (commit Commit) String() string {
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return fmt.Sprintf("Commit{A:%X R:%v %X}", commit.Address, commit.Round, Fingerprint(commit.Signature))
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}
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//-------------------------------------
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// NOTE: The Commits are in order of address to preserve the bonded ValidatorSet order.
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// Any peer with a block can gossip commits by index with a peer without recalculating the
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// active ValidatorSet.
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type Validation struct {
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Commits []Commit // Commits (or nil) of all active validators in address order.
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// Volatile
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hash []byte
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bitArray BitArray
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}
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func (v *Validation) ValidateBasic() error {
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if len(v.Commits) == 0 {
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return errors.New("No commits in validation")
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}
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lastAddress := []byte{}
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for i := 0; i < len(v.Commits); i++ {
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commit := v.Commits[i]
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if commit.IsZero() {
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if len(commit.Address) > 0 {
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return errors.New("Zero commits should not have an address")
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}
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} else {
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if len(commit.Address) == 0 {
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return errors.New("Nonzero commits should have an address")
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}
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if len(lastAddress) > 0 && bytes.Compare(lastAddress, commit.Address) != -1 {
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return errors.New("Invalid commit order")
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}
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lastAddress = commit.Address
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}
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}
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return nil
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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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bs := make([]interface{}, len(v.Commits))
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for i, commit := range v.Commits {
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bs[i] = commit
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}
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v.hash = merkle.HashFromBinaries(bs)
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}
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return v.hash
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}
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func (v *Validation) StringIndented(indent string) string {
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if v == nil {
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return "nil-Validation"
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}
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commitStrings := make([]string, len(v.Commits))
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for i, commit := range v.Commits {
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commitStrings[i] = commit.String()
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}
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return fmt.Sprintf(`Validation{
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%s %v
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%s}#%X`,
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indent, strings.Join(commitStrings, "\n"+indent+" "),
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indent, v.hash)
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}
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func (v *Validation) BitArray() BitArray {
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if v.bitArray.IsZero() {
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v.bitArray = NewBitArray(uint(len(v.Commits)))
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for i, commit := range v.Commits {
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v.bitArray.SetIndex(uint(i), !commit.IsZero())
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}
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}
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return v.bitArray
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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 (data *Data) Hash() []byte {
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if data.hash == nil {
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bs := make([]interface{}, len(data.Txs))
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for i, tx := range data.Txs {
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bs[i] = account.SignBytes(tx)
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}
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data.hash = merkle.HashFromBinaries(bs)
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}
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return data.hash
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}
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func (data *Data) StringIndented(indent string) string {
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if data == nil {
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return "nil-Data"
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}
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txStrings := make([]string, len(data.Txs))
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for i, tx := range data.Txs {
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txStrings[i] = fmt.Sprintf("Tx:%v", tx)
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}
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return fmt.Sprintf(`Data{
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%s %v
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%s}#%X`,
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indent, strings.Join(txStrings, "\n"+indent+" "),
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indent, data.hash)
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}
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