/// <summary>
/// Applies an externally generated contract method call message to the current state.
/// </summary>
public StateTransitionResult Apply(IState state, ExternalCallMessage message)
{
var gasMeter = new GasMeter(message.GasLimit);
gasMeter.Spend((Gas)GasPriceList.BaseCost);
byte[] contractCode = state.ContractState.GetCode(message.To);
if (contractCode == null || contractCode.Length == 0)
{
return(StateTransitionResult.Fail(gasMeter.GasConsumed, StateTransitionErrorKind.NoCode));
}
// For external calls we need to increment the balance state to take into
// account any funds sent as part of the original contract invocation transaction.
state.AddInitialTransfer(new TransferInfo(message.From, message.To, message.Amount));
return(ApplyCall(state, message, contractCode, gasMeter));
}
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()
);
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);
}
bool revert = !result.IsSuccess;
Transaction internalTransaction = this.transferProcessor.Process(
newState.ContractState,
result.Success?.ContractAddress,
transactionContext,
newState.InternalTransfers,
revert);
if (result.IsSuccess)
{
state.TransitionTo(newState);
}
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);
}