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vmInput.go
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vmInput.go
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package smartContract
import (
"math/big"
"github.com/ElrondNetwork/elrond-go/core"
"github.com/ElrondNetwork/elrond-go/core/vmcommon"
"github.com/ElrondNetwork/elrond-go/data"
"github.com/ElrondNetwork/elrond-go/data/smartContractResult"
"github.com/ElrondNetwork/elrond-go/process"
)
func (sc *scProcessor) createVMDeployInput(tx data.TransactionHandler) (*vmcommon.ContractCreateInput, []byte, error) {
deployData, err := sc.argsParser.ParseDeployData(string(tx.GetData()))
if err != nil {
return nil, nil, err
}
vmCreateInput := &vmcommon.ContractCreateInput{}
vmCreateInput.ContractCode = deployData.Code
vmCreateInput.ContractCodeMetadata = deployData.CodeMetadata.ToBytes()
vmCreateInput.VMInput = vmcommon.VMInput{}
err = sc.initializeVMInputFromTx(&vmCreateInput.VMInput, tx)
if err != nil {
return nil, nil, err
}
vmCreateInput.VMInput.Arguments = deployData.Arguments
return vmCreateInput, deployData.VMType, nil
}
func (sc *scProcessor) initializeVMInputFromTx(vmInput *vmcommon.VMInput, tx data.TransactionHandler) error {
var err error
vmInput.CallerAddr = tx.GetSndAddr()
vmInput.CallValue = new(big.Int).Set(tx.GetValue())
vmInput.GasPrice = tx.GetGasPrice()
vmInput.GasProvided, err = sc.prepareGasProvided(tx)
if err != nil {
return err
}
return nil
}
func isSmartContractResult(tx data.TransactionHandler) bool {
_, isScr := tx.(*smartContractResult.SmartContractResult)
return isScr
}
func (sc *scProcessor) prepareGasProvided(tx data.TransactionHandler) (uint64, error) {
if sc.flagDeploy.IsSet() && isSmartContractResult(tx) {
return tx.GetGasLimit(), nil
}
if sc.shardCoordinator.ComputeId(tx.GetSndAddr()) == core.MetachainShardId {
return tx.GetGasLimit(), nil
}
gasForTxData := sc.economicsFee.ComputeGasLimit(tx)
if tx.GetGasLimit() < gasForTxData {
return 0, process.ErrNotEnoughGas
}
return tx.GetGasLimit() - gasForTxData, nil
}
func (sc *scProcessor) createVMCallInput(
tx data.TransactionHandler,
txHash []byte,
builtInFuncCall bool,
) (*vmcommon.ContractCallInput, error) {
callType := determineCallType(tx)
txData := string(tx.GetData())
if !builtInFuncCall {
txData = string(prependCallbackToTxDataIfAsyncCallBack(tx.GetData(), callType))
}
function, arguments, err := sc.argsParser.ParseCallData(txData)
if err != nil {
return nil, err
}
finalArguments, gasLocked := sc.getAsyncCallGasLockFromTxData(callType, arguments)
vmCallInput := &vmcommon.ContractCallInput{}
vmCallInput.VMInput = vmcommon.VMInput{}
vmCallInput.CallType = callType
vmCallInput.RecipientAddr = tx.GetRcvAddr()
vmCallInput.Function = function
vmCallInput.CurrentTxHash = txHash
vmCallInput.GasLocked = gasLocked
scr, isSCR := tx.(*smartContractResult.SmartContractResult)
if isSCR {
vmCallInput.OriginalTxHash = scr.GetOriginalTxHash()
vmCallInput.PrevTxHash = scr.PrevTxHash
} else {
vmCallInput.OriginalTxHash = txHash
vmCallInput.PrevTxHash = txHash
}
err = sc.initializeVMInputFromTx(&vmCallInput.VMInput, tx)
if err != nil {
return nil, err
}
vmCallInput.VMInput.Arguments = finalArguments
if vmCallInput.GasProvided > tx.GetGasLimit() {
return nil, process.ErrInvalidVMInputGasComputation
}
vmCallInput.GasProvided, err = core.SafeSubUint64(vmCallInput.GasProvided, gasLocked)
if err != nil {
return nil, err
}
return vmCallInput, nil
}
func (sc *scProcessor) getAsyncCallGasLockFromTxData(callType vmcommon.CallType, arguments [][]byte) ([][]byte, uint64) {
if callType != vmcommon.AsynchronousCall {
return arguments, 0
}
lenArgs := len(arguments)
if lenArgs == 0 {
return arguments, 0
}
lastArg := arguments[lenArgs-1]
gasLocked := big.NewInt(0).SetBytes(lastArg).Uint64()
argsWithoutGasLocked := make([][]byte, lenArgs-1)
copy(argsWithoutGasLocked, arguments[:lenArgs-1])
return argsWithoutGasLocked, gasLocked
}
func determineCallType(tx data.TransactionHandler) vmcommon.CallType {
scr, isSCR := tx.(*smartContractResult.SmartContractResult)
if isSCR {
return scr.CallType
}
return vmcommon.DirectCall
}
func prependCallbackToTxDataIfAsyncCallBack(txData []byte, callType vmcommon.CallType) []byte {
if callType == vmcommon.AsynchronousCallBack {
return append([]byte("callBack"), txData...)
}
return txData
}