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core: optimize tx verification, only get references and results once

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Getting references requires DB access and that is expensive.
This commit is contained in:
Roman Khimov 2020-03-06 20:15:01 +03:00
parent fe4916f691
commit baeaa3dbe6
1 changed files with 19 additions and 13 deletions
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32
pkg/core/blockchain.go
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@ -1364,7 +1364,12 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
if err := bc.verifyOutputs(t); err != nil {
return errors.Wrap(err, "wrong outputs")
}
if err := bc.verifyResults(t); err != nil {
refs, err := bc.References(t)
if err != nil {
return err
}
results := refsAndOutsToResults(refs, t.Outputs)
if err := bc.verifyResults(t, results); err != nil {
return err
}
@ -1383,7 +1388,7 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
if bc.dao.IsDoubleClaim(claim) {
return errors.New("double claim")
}
if err := bc.verifyClaims(t); err != nil {
if err := bc.verifyClaims(t, results); err != nil {
return err
}
case transaction.InvocationType:
@ -1396,10 +1401,9 @@ func (bc *Blockchain) verifyTx(t *transaction.Transaction, block *block.Block) e
return bc.verifyTxWitnesses(t, block)
}
func (bc *Blockchain) verifyClaims(tx *transaction.Transaction) (err error) {
func (bc *Blockchain) verifyClaims(tx *transaction.Transaction, results []*transaction.Result) (err error) {
t := tx.Data.(*transaction.ClaimTX)
var result *transaction.Result
results := bc.GetTransactionResults(tx)
for i := range results {
if results[i].AssetID == UtilityTokenID() {
result = results[i]
@ -1581,11 +1585,7 @@ func (bc *Blockchain) verifyOutputs(t *transaction.Transaction) error {
return nil
}
func (bc *Blockchain) verifyResults(t *transaction.Transaction) error {
results := bc.GetTransactionResults(t)
if results == nil {
return errors.New("tx has no results")
}
func (bc *Blockchain) verifyResults(t *transaction.Transaction, results []*transaction.Result) error {
var resultsDestroy []*transaction.Result
var resultsIssue []*transaction.Result
for _, re := range results {
@ -1641,18 +1641,24 @@ func (bc *Blockchain) verifyResults(t *transaction.Transaction) error {
// GetTransactionResults returns the transaction results aggregate by assetID.
// Golang of GetTransationResults method in C# (https://github.com/neo-project/neo/blob/master/neo/Network/P2P/Payloads/Transaction.cs#L207)
func (bc *Blockchain) GetTransactionResults(t *transaction.Transaction) []*transaction.Result {
var results []*transaction.Result
tempResult := make(map[util.Uint256]util.Fixed8)
references, err := bc.References(t)
if err != nil {
return nil
}
return refsAndOutsToResults(references, t.Outputs)
}
// mapReferencesToResults returns cumulative results of transaction based in its
// references and outputs.
func refsAndOutsToResults(references []transaction.InOut, outputs []transaction.Output) []*transaction.Result {
var results []*transaction.Result
tempResult := make(map[util.Uint256]util.Fixed8)
for _, inout := range references {
c := tempResult[inout.Out.AssetID]
tempResult[inout.Out.AssetID] = c.Add(inout.Out.Amount)
}
for _, output := range t.Outputs {
for _, output := range outputs {
c := tempResult[output.AssetID]
tempResult[output.AssetID] = c.Sub(output.Amount)
}