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) Type() byte { return VoteTypePrecommit } func (v *Validation) Size() int { if v == nil { return 0 } return len(v.Precommits) } 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 } func (v *Validation) GetByIndex(index int) *Vote { return v.Precommits[index] } func (v *Validation) IsCommit() bool { if len(v.Precommits) == 0 { return false } return true } 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) } //----------------------------------------------------------------------------- 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) }