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Define a selection session wrapper to track accounts state, across al…
…l "heap items" (within a selection session).
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package txcache | ||
|
|
||
| import ( | ||
| "math/big" | ||
|
|
||
| "github.com/multiversx/mx-chain-core-go/data" | ||
| ) | ||
|
|
||
| // After moving "mx-chain-storage-go/txcache" into "mx-chain-go", maybe merge this component into "SelectionSession". | ||
| type selectionSessionWrapper struct { | ||
| session SelectionSession | ||
| recordByAddress map[string]*accountBalanceRecord | ||
| } | ||
|
|
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| type accountBalanceRecord struct { | ||
| initialNonce uint64 | ||
| initialBalance *big.Int | ||
| consumedBalance *big.Int | ||
| } | ||
|
|
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| func newSelectionSessionWrapper(session SelectionSession) *selectionSessionWrapper { | ||
| return &selectionSessionWrapper{ | ||
| session: session, | ||
| recordByAddress: make(map[string]*accountBalanceRecord), | ||
| } | ||
| } | ||
|
|
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| func (sessionWrapper *selectionSessionWrapper) getAccountRecord(address []byte) *accountBalanceRecord { | ||
| record, ok := sessionWrapper.recordByAddress[string(address)] | ||
| if ok { | ||
| return record | ||
| } | ||
|
|
||
| state, err := sessionWrapper.session.GetAccountState(address) | ||
| if err != nil { | ||
| logSelect.Debug("selectionSessionWrapper.getAccountRecord, could not retrieve account state", "address", address, "err", err) | ||
|
|
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| record = &accountBalanceRecord{ | ||
| initialNonce: 0, | ||
| initialBalance: big.NewInt(0), | ||
| consumedBalance: big.NewInt(0), | ||
| } | ||
| } else { | ||
| record = &accountBalanceRecord{ | ||
| initialNonce: state.Nonce, | ||
| initialBalance: state.Balance, | ||
| consumedBalance: big.NewInt(0), | ||
| } | ||
| } | ||
|
|
||
| sessionWrapper.recordByAddress[string(address)] = record | ||
| return record | ||
| } | ||
|
|
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| func (sessionWrapper *selectionSessionWrapper) getNonce(address []byte) uint64 { | ||
| record := sessionWrapper.getAccountRecord(address) | ||
| return record.initialNonce | ||
| } | ||
|
|
||
| func (sessionWrapper *selectionSessionWrapper) accumulateConsumedBalance(tx *WrappedTransaction) { | ||
| sender := tx.Tx.GetSndAddr() | ||
| feePayer := tx.FeePayer | ||
|
|
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| senderRecord := sessionWrapper.getAccountRecord(sender) | ||
| feePayerRecord := sessionWrapper.getAccountRecord(feePayer) | ||
|
|
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| transferredValue := tx.TransferredValue | ||
| if transferredValue != nil { | ||
| senderRecord.consumedBalance.Add(senderRecord.consumedBalance, transferredValue) | ||
| } | ||
|
|
||
| fee := tx.Fee | ||
| if fee != nil { | ||
| feePayerRecord.consumedBalance.Add(feePayerRecord.consumedBalance, fee) | ||
| } | ||
| } | ||
|
|
||
| func (sessionWrapper *selectionSessionWrapper) detectWillFeeExceedBalance(tx *WrappedTransaction) bool { | ||
| fee := tx.Fee | ||
| if fee == nil { | ||
| return false | ||
| } | ||
|
|
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| // Here, we are not interested into an eventual transfer of value (we only check if there's enough balance to pay the transaction fee). | ||
| feePayer := tx.FeePayer | ||
| feePayerRecord := sessionWrapper.getAccountRecord(feePayer) | ||
|
|
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| futureConsumedBalance := new(big.Int).Add(feePayerRecord.consumedBalance, fee) | ||
| feePayerBalance := feePayerRecord.initialBalance | ||
|
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| willFeeExceedBalance := futureConsumedBalance.Cmp(feePayerBalance) > 0 | ||
| if willFeeExceedBalance { | ||
| logSelect.Trace("selectionSessionWrapper.detectWillFeeExceedBalance", | ||
| "tx", tx.TxHash, | ||
| "feePayer", feePayer, | ||
| "initialBalance", feePayerRecord.initialBalance, | ||
| "consumedBalance", feePayerRecord.consumedBalance, | ||
| ) | ||
| } | ||
|
|
||
| return willFeeExceedBalance | ||
| } | ||
|
|
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| func (sessionWrapper *selectionSessionWrapper) isIncorrectlyGuarded(tx data.TransactionHandler) bool { | ||
| return sessionWrapper.session.IsIncorrectlyGuarded(tx) | ||
| } |
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