public ISmartContractExecutionResult Execute(ISmartContractTransactionContext transactionContext)
{
this.logger.LogTrace("()");
var carrier = SmartContractCarrier.Deserialize(transactionContext);
// Create a new address for the contract.
uint160 newContractAddress = carrier.GetNewContractAddress();
// Create an account for the contract in the state repository.
this.stateSnapshot.CreateAccount(newContractAddress);
// Decompile the contract execution code and validate it.
SmartContractDecompilation decompilation = SmartContractDecompiler.GetModuleDefinition(carrier.CallData.ContractExecutionCode);
SmartContractValidationResult validation = this.validator.Validate(decompilation);
// If validation failed, refund the sender any remaining gas.
if (!validation.IsValid)
{
this.logger.LogTrace("(-)[CONTRACT_VALIDATION_FAILED]");
return(SmartContractExecutionResult.ValidationFailed(carrier, validation));
}
var block = new Block(transactionContext.BlockHeight, transactionContext.CoinbaseAddress.ToAddress(this.network));
var executionContext = new SmartContractExecutionContext
(
block,
new Message(
newContractAddress.ToAddress(this.network),
carrier.Sender.ToAddress(this.network),
carrier.Value,
carrier.CallData.GasLimit
),
newContractAddress,
carrier.CallData.GasPrice,
carrier.MethodParameters
);
LogExecutionContext(this.logger, block, executionContext.Message, newContractAddress, carrier);
var gasMeter = new GasMeter(carrier.CallData.GasLimit);
IPersistenceStrategy persistenceStrategy = new MeteredPersistenceStrategy(this.stateSnapshot, gasMeter, new BasicKeyEncodingStrategy());
var persistentState = new PersistentState(persistenceStrategy, newContractAddress, this.network);
gasMeter.Spend((Gas)GasPriceList.BaseCost);
var result = this.vm.Create(carrier.CallData.ContractExecutionCode, executionContext, gasMeter, persistentState, this.stateSnapshot);
var revert = result.ExecutionException != null;
var internalTransaction = this.transferProcessor.Process(
carrier,
this.stateSnapshot,
transactionContext,
result.InternalTransfers,
revert);
(var fee, var refundTxOuts) = this.refundProcessor.Process(
carrier,
transactionContext.MempoolFee,
result.GasConsumed,
result.ExecutionException);
var executionResult = new SmartContractExecutionResult
{
NewContractAddress = revert ? null : newContractAddress,
Exception = result.ExecutionException,
GasConsumed = result.GasConsumed,
Return = result.Result,
InternalTransaction = internalTransaction,
Fee = fee,
Refunds = refundTxOuts
};
if (revert)
{
this.logger.LogTrace("(-)[CONTRACT_EXECUTION_FAILED]");
this.stateSnapshot.Rollback();
}
else
{
this.logger.LogTrace("(-):{0}={1}", nameof(newContractAddress), newContractAddress);
this.stateSnapshot.SetCode(newContractAddress, carrier.CallData.ContractExecutionCode);
this.stateSnapshot.Commit();
}
return(executionResult);
}
private ISmartContractExecutionResult CreateContextAndExecute(uint160 contractAddress, byte[] contractCode,
string methodName, ISmartContractTransactionContext transactionContext, SmartContractCarrier carrier)
{
this.logger.LogTrace("()");
var block = new Block(transactionContext.BlockHeight,
transactionContext.CoinbaseAddress.ToAddress(this.network));
var executionContext = new SmartContractExecutionContext
(
block,
new Message(
contractAddress.ToAddress(this.network),
carrier.Sender.ToAddress(this.network),
carrier.Value,
carrier.CallData.GasLimit
),
contractAddress,
carrier.CallData.GasPrice,
carrier.MethodParameters
);
LogExecutionContext(this.logger, block, executionContext.Message, contractAddress, carrier);
var gasMeter = new GasMeter(carrier.CallData.GasLimit);
IPersistenceStrategy persistenceStrategy =
new MeteredPersistenceStrategy(this.stateSnapshot, gasMeter, this.keyEncodingStrategy);
var persistentState = new PersistentState(persistenceStrategy, contractAddress, this.network);
gasMeter.Spend((Gas)GasPriceList.BaseCost);
var result = this.vm.ExecuteMethod(
contractCode,
methodName,
executionContext,
gasMeter,
persistentState,
this.stateSnapshot);
var revert = result.ExecutionException != null;
this.logger.LogTrace("(-)");
var internalTransaction = this.transferProcessor.Process(
carrier,
this.stateSnapshot,
transactionContext,
result.InternalTransfers,
revert);
(var fee, var refundTxOuts) = this.refundProcessor.Process(
carrier,
transactionContext.MempoolFee,
result.GasConsumed,
result.ExecutionException);
var executionResult = new SmartContractExecutionResult
{
Exception = result.ExecutionException,
GasConsumed = result.GasConsumed,
Return = result.Result,
InternalTransaction = internalTransaction,
Fee = fee,
Refunds = refundTxOuts
};
if (revert)
{
this.stateSnapshot.Rollback();
}
else
{
this.stateSnapshot.Commit();
}
return(executionResult);
}
public IContractExecutionResult Execute(IContractTransactionContext transactionContext)
{
// Deserialization can't fail because this has already been through SmartContractFormatRule.
Result <ContractTxData> callDataDeserializationResult = this.serializer.Deserialize(transactionContext.Data);
ContractTxData callData = callDataDeserializationResult.Value;
bool creation = callData.IsCreateContract;
var block = new Block(
transactionContext.BlockHeight,
transactionContext.CoinbaseAddress.ToAddress(this.network)
);
IState state = this.stateFactory.Create(
this.stateRoot,
block,
transactionContext.TxOutValue,
transactionContext.TransactionHash);
StateTransitionResult result;
IState newState = state.Snapshot();
if (creation)
{
var message = new ExternalCreateMessage(
transactionContext.Sender,
transactionContext.TxOutValue,
callData.GasLimit,
callData.ContractExecutionCode,
callData.MethodParameters
);
result = this.stateProcessor.Apply(newState, message);
}
else
{
var message = new ExternalCallMessage(
callData.ContractAddress,
transactionContext.Sender,
transactionContext.TxOutValue,
callData.GasLimit,
new MethodCall(callData.MethodName, callData.MethodParameters)
);
result = this.stateProcessor.Apply(newState, message);
}
if (result.IsSuccess)
{
state.TransitionTo(newState);
}
bool revert = !result.IsSuccess;
Transaction internalTransaction = this.transferProcessor.Process(
this.stateRoot,
result.Success?.ContractAddress,
transactionContext,
state.InternalTransfers,
revert);
bool outOfGas = result.IsFailure && result.Error.Kind == StateTransitionErrorKind.OutOfGas;
(Money fee, TxOut refundTxOut) = this.refundProcessor.Process(
callData,
transactionContext.MempoolFee,
transactionContext.Sender,
result.GasConsumed,
outOfGas);
var executionResult = new SmartContractExecutionResult
{
To = !callData.IsCreateContract ? callData.ContractAddress : null,
NewContractAddress = !revert && creation ? result.Success?.ContractAddress : null,
ErrorMessage = result.Error?.GetErrorMessage(),
Revert = revert,
GasConsumed = result.GasConsumed,
Return = result.Success?.ExecutionResult,
InternalTransaction = internalTransaction,
Fee = fee,
Refund = refundTxOut,
Logs = state.GetLogs(this.contractPrimitiveSerializer)
};
return(executionResult);
}