6 log "github.com/sirupsen/logrus"
8 "github.com/vapor/consensus"
9 "github.com/vapor/errors"
10 "github.com/vapor/protocol/bc"
11 "github.com/vapor/protocol/bc/types"
12 "github.com/vapor/protocol/state"
15 const logModule = "leveldb"
18 errBadTimestamp = errors.New("block timestamp is not in the valid range")
19 errBadBits = errors.New("block bits is invalid")
20 errMismatchedBlock = errors.New("mismatched block")
21 errMismatchedMerkleRoot = errors.New("mismatched merkle root")
22 errMisorderedBlockHeight = errors.New("misordered block height")
23 errOverBlockLimit = errors.New("block's gas is over the limit")
24 errWorkProof = errors.New("invalid difficulty proof of work")
25 errVersionRegression = errors.New("version regression")
28 func checkBlockTime(b *bc.Block, parent *state.BlockNode) error {
29 if b.Timestamp > uint64(time.Now().Unix())+consensus.MaxTimeOffsetSeconds {
30 return errBadTimestamp
33 if b.Timestamp <= parent.CalcPastMedianTime() {
34 return errBadTimestamp
39 func checkCoinbaseAmount(b *bc.Block, amount uint64) error {
40 if len(b.Transactions) == 0 {
41 return errors.Wrap(ErrWrongCoinbaseTransaction, "block is empty")
44 tx := b.Transactions[0]
45 if len(tx.TxHeader.ResultIds) != 1 {
46 return errors.Wrap(ErrWrongCoinbaseTransaction, "have more than 1 output")
49 output, err := tx.Output(*tx.TxHeader.ResultIds[0])
54 if output.Source.Value.Amount != amount {
55 return errors.Wrap(ErrWrongCoinbaseTransaction, "dismatch output amount")
60 // ValidateBlockHeader check the block's header
61 func ValidateBlockHeader(b *bc.Block, parent *state.BlockNode) error {
63 return errors.WithDetailf(errVersionRegression, "previous block verson %d, current block version %d", parent.Version, b.Version)
65 if b.Height != parent.Height+1 {
66 return errors.WithDetailf(errMisorderedBlockHeight, "previous block height %d, current block height %d", parent.Height, b.Height)
68 if parent.Hash != *b.PreviousBlockId {
69 return errors.WithDetailf(errMismatchedBlock, "previous block ID %x, current block wants %x", parent.Hash.Bytes(), b.PreviousBlockId.Bytes())
72 return checkBlockTime(b, parent)
75 // ValidateBlock validates a block and the transactions within.
76 func ValidateBlock(b *bc.Block, parent *state.BlockNode) error {
77 startTime := time.Now()
78 if err := ValidateBlockHeader(b, parent); err != nil {
82 blockGasSum := uint64(0)
83 coinbaseAmount := consensus.BlockSubsidy(b.BlockHeader.Height)
84 b.TransactionStatus = bc.NewTransactionStatus()
86 for i, tx := range b.Transactions {
87 gasStatus, err := ValidateTx(tx, b)
88 if !gasStatus.GasValid {
89 return errors.Wrapf(err, "validate of transaction %d of %d", i, len(b.Transactions))
92 if err := b.TransactionStatus.SetStatus(i, err != nil); err != nil {
95 coinbaseAmount += gasStatus.BTMValue
96 if blockGasSum += uint64(gasStatus.GasUsed); blockGasSum > consensus.MaxBlockGas {
97 return errOverBlockLimit
101 if err := checkCoinbaseAmount(b, coinbaseAmount); err != nil {
105 txMerkleRoot, err := types.TxMerkleRoot(b.Transactions)
107 return errors.Wrap(err, "computing transaction id merkle root")
109 if txMerkleRoot != *b.TransactionsRoot {
110 return errors.WithDetailf(errMismatchedMerkleRoot, "transaction id merkle root")
113 txStatusHash, err := types.TxStatusMerkleRoot(b.TransactionStatus.VerifyStatus)
115 return errors.Wrap(err, "computing transaction status merkle root")
117 if txStatusHash != *b.TransactionStatusHash {
118 return errors.WithDetailf(errMismatchedMerkleRoot, "transaction status merkle root")
121 log.WithFields(log.Fields{
124 "hash": b.ID.String(),
125 "duration": time.Since(startTime),
126 }).Debug("finish validate block")