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validator.go
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validator.go
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package ledger
import (
"bytes"
"errors"
"fmt"
"time"
"github.com/golang/protobuf/proto"
"github.com/nknorg/nkn/common"
"github.com/nknorg/nkn/core/signature"
tx "github.com/nknorg/nkn/core/transaction"
"github.com/nknorg/nkn/core/transaction/payload"
"github.com/nknorg/nkn/crypto"
. "github.com/nknorg/nkn/errors"
"github.com/nknorg/nkn/por"
"github.com/nknorg/nkn/util/config"
"github.com/nknorg/nkn/util/log"
)
const (
GenesisBlockProposedHeight = 4
)
type VBlock struct {
Block *Block
ReceiveTime int64
}
func TransactionCheck(block *Block) error {
if block.Transactions == nil {
return errors.New("empty block")
}
if block.Transactions[0].TxType != tx.Coinbase {
return errors.New("first transaction in block is not Coinbase")
}
for i, txn := range block.Transactions {
if i != 0 && txn.TxType == tx.Coinbase {
return errors.New("Coinbase transaction order is incorrect")
}
if errCode := tx.VerifyTransaction(txn); errCode != ErrNoError {
return errors.New("transaction sanity check failed")
}
if errCode := tx.VerifyTransactionWithLedger(txn); errCode != ErrNoError {
return errors.New("transaction history check failed")
}
}
return nil
}
func HeaderCheck(header *Header, receiveTime int64) error {
height := header.Height
if height == 0 {
return nil
}
prevHeader, err := DefaultLedger.Blockchain.GetHeader(header.PrevBlockHash)
if err != nil {
return errors.New("prev header doesn't exist")
}
if prevHeader == nil {
return errors.New("invalid prev header")
}
if prevHeader.Height+1 != height {
return errors.New("invalid header height")
}
if prevHeader.Timestamp >= header.Timestamp {
return errors.New("invalid header timestamp")
}
if header.WinningHashType == GenesisHash && header.Height >= GenesisBlockProposedHeight {
return errors.New("invalid winning hash type")
}
// calculate time difference
var timeDiff int64
genesisBlockHash, err := DefaultLedger.Store.GetBlockHash(0)
if err != nil {
return err
}
genesisBlock, err := DefaultLedger.Store.GetBlock(genesisBlockHash)
if err != nil {
return err
}
prevTimestamp, err := DefaultLedger.Blockchain.GetBlockTime(header.PrevBlockHash)
if err != nil {
return err
}
if prevTimestamp == genesisBlock.Header.Timestamp {
timeDiff = 0
} else {
timeDiff = receiveTime - prevTimestamp
}
// get miner who will sign next block
var miner []byte
timeSlot := int64(config.ProposerChangeTime / time.Second)
if timeDiff > timeSlot {
index := timeDiff / timeSlot
proposerBlockHeight := int64(DefaultLedger.Store.GetHeight()) - index
if proposerBlockHeight < 0 {
proposerBlockHeight = 0
}
proposerBlockHash, err := DefaultLedger.Store.GetBlockHash(uint32(proposerBlockHeight))
if err != nil {
return err
}
proposerBlock, err := DefaultLedger.Store.GetBlock(proposerBlockHash)
if err != nil {
return err
}
miner, err = proposerBlock.GetSigner()
log.Infof("verification: block singer should be: %s which is the signer of block %d",
common.BytesToHexString(miner), proposerBlockHeight)
if err != nil {
return err
}
} else {
winningHash := prevHeader.WinningHash
winningHashType := prevHeader.WinningHashType
switch winningHashType {
case GenesisHash:
miner, err = genesisBlock.GetSigner()
if err != nil {
return err
}
log.Infof("verification: block singer should be %s which is genesis block proposer",
common.BytesToHexString(miner))
case WinningTxnHash:
txn, err := DefaultLedger.Store.GetTransaction(winningHash)
if err != nil {
return err
}
payload, ok := txn.Payload.(*payload.Commit)
if !ok {
return errors.New("invalid transaction type")
}
sigchain := &por.SigChain{}
proto.Unmarshal(payload.SigChain, sigchain)
miner, err = sigchain.GetMiner()
if err != nil {
return err
}
txnHash := txn.Hash()
log.Infof("verification: block singer should be %s which is got in sigchain transaction %s",
common.BytesToHexString(miner), common.BytesToHexString(txnHash.ToArrayReverse()))
case WinningNilHash:
miner = prevHeader.Signer
log.Infof("verification: block singer should be: %s which is the signer of previous block %d",
common.BytesToHexString(miner), prevHeader.Height)
}
}
// verify header signature
if bytes.Compare(miner, header.Signer) != 0 {
return fmt.Errorf("invalid block signer: %s", common.BytesToHexString(header.Signer))
}
rawPubKey, err := crypto.DecodePoint(miner)
if err != nil {
return err
}
err = crypto.Verify(*rawPubKey, signature.GetHashForSigning(header), header.Signature)
if err != nil {
log.Error("block header verification error: ", err)
return err
}
return nil
}