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scQueryService.go
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scQueryService.go
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package smartContract
import (
"errors"
"math"
"math/big"
"sync"
"github.com/ElrondNetwork/elrond-go/core/check"
"github.com/ElrondNetwork/elrond-go/core/parsers"
"github.com/ElrondNetwork/elrond-go/core/vmcommon"
"github.com/ElrondNetwork/elrond-go/data"
"github.com/ElrondNetwork/elrond-go/data/transaction"
"github.com/ElrondNetwork/elrond-go/process"
)
var _ process.SCQueryService = (*SCQueryService)(nil)
// SCQueryService can execute Get functions over SC to fetch stored values
type SCQueryService struct {
vmContainer process.VirtualMachinesContainer
economicsFee process.FeeHandler
mutRunSc sync.Mutex
blockChainHook process.BlockChainHookHandler
blockChain data.ChainHandler
numQueries int
gasForQuery uint64
}
// NewSCQueryService returns a new instance of SCQueryService
func NewSCQueryService(
vmContainer process.VirtualMachinesContainer,
economicsFee process.FeeHandler,
blockChainHook process.BlockChainHookHandler,
blockChain data.ChainHandler,
) (*SCQueryService, error) {
if check.IfNil(vmContainer) {
return nil, process.ErrNoVM
}
if check.IfNil(economicsFee) {
return nil, process.ErrNilEconomicsFeeHandler
}
if check.IfNil(blockChainHook) {
return nil, process.ErrNilBlockChainHook
}
if check.IfNil(blockChain) {
return nil, process.ErrNilBlockChain
}
return &SCQueryService{
vmContainer: vmContainer,
economicsFee: economicsFee,
blockChain: blockChain,
blockChainHook: blockChainHook,
gasForQuery: math.MaxUint64,
}, nil
}
// ExecuteQuery returns the VMOutput resulted upon running the function on the smart contract
func (service *SCQueryService) ExecuteQuery(query *process.SCQuery) (*vmcommon.VMOutput, error) {
if query.ScAddress == nil {
return nil, process.ErrNilScAddress
}
if len(query.FuncName) == 0 {
return nil, process.ErrEmptyFunctionName
}
service.mutRunSc.Lock()
defer service.mutRunSc.Unlock()
return service.executeScCall(query, 0)
}
func (service *SCQueryService) executeScCall(query *process.SCQuery, gasPrice uint64) (*vmcommon.VMOutput, error) {
log.Debug("executeScCall", "function", query.FuncName, "numQueries", service.numQueries)
service.numQueries++
service.blockChainHook.SetCurrentHeader(service.blockChain.GetCurrentBlockHeader())
vm, err := findVMByScAddress(service.vmContainer, query.ScAddress)
if err != nil {
return nil, err
}
query = prepareScQuery(query)
vmInput := service.createVMCallInput(query, gasPrice)
vmOutput, err := vm.RunSmartContractCall(vmInput)
if err != nil {
return nil, err
}
if service.hasRetriableExecutionError(vmOutput) {
log.Error("Retriable execution error detected. Will retry (once) executeScCall()", "returnCode", vmOutput.ReturnCode, "returnMessage", vmOutput.ReturnMessage)
vmOutput, err = vm.RunSmartContractCall(vmInput)
if err != nil {
return nil, err
}
}
return vmOutput, nil
}
func prepareScQuery(query *process.SCQuery) *process.SCQuery {
if query.CallerAddr == nil {
query.CallerAddr = query.ScAddress
}
if query.CallValue == nil {
query.CallValue = big.NewInt(0)
}
return query
}
func (service *SCQueryService) createVMCallInput(query *process.SCQuery, gasPrice uint64) *vmcommon.ContractCallInput {
vmInput := vmcommon.VMInput{
CallerAddr: query.CallerAddr,
CallValue: query.CallValue,
GasPrice: gasPrice,
GasProvided: service.gasForQuery,
Arguments: query.Arguments,
CallType: vmcommon.DirectCall,
}
vmContractCallInput := &vmcommon.ContractCallInput{
RecipientAddr: query.ScAddress,
Function: query.FuncName,
VMInput: vmInput,
}
return vmContractCallInput
}
func (service *SCQueryService) hasRetriableExecutionError(vmOutput *vmcommon.VMOutput) bool {
return vmOutput.ReturnMessage == "allocation error"
}
// ComputeScCallGasLimit will estimate how many gas a transaction will consume
func (service *SCQueryService) ComputeScCallGasLimit(tx *transaction.Transaction) (uint64, error) {
argParser := parsers.NewCallArgsParser()
function, arguments, err := argParser.ParseData(string(tx.Data))
if err != nil {
return 0, err
}
query := &process.SCQuery{
ScAddress: tx.RcvAddr,
CallerAddr: tx.SndAddr,
FuncName: function,
Arguments: arguments,
CallValue: tx.Value,
}
service.mutRunSc.Lock()
defer service.mutRunSc.Unlock()
vmOutput, err := service.executeScCall(query, 1)
if err != nil {
return 0, err
}
if vmOutput.ReturnCode != vmcommon.Ok {
return 0, errors.New(vmOutput.ReturnMessage)
}
moveBalanceGasLimit := service.economicsFee.ComputeGasLimit(tx)
gasConsumedExecution := service.gasForQuery - vmOutput.GasRemaining
gasLimit := moveBalanceGasLimit + gasConsumedExecution
return gasLimit, nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (service *SCQueryService) IsInterfaceNil() bool {
return service == nil
}