public (Money, TxOut) Process(ContractTxData contractTxData,
ulong mempoolFee, uint160 sender,
Gas gasConsumed,
bool outOfGas)
{
this.logger.LogTrace("(){0}:{1}", nameof(mempoolFee), mempoolFee);
Money fee = mempoolFee;
if (outOfGas)
{
this.logger.LogTrace("(-)[OUTOFGAS_EXCEPTION]");
return(fee, null);
}
var refund = new Money(contractTxData.GasCostBudget - (gasConsumed * contractTxData.GasPrice));
this.logger.LogTrace("{0}:{1},{2}:{3},{4}:{5},{6}:{7}", nameof(contractTxData.GasCostBudget), contractTxData.GasCostBudget, nameof(gasConsumed), gasConsumed, nameof(contractTxData.GasPrice), contractTxData.GasPrice, nameof(refund), refund);
TxOut ret = null;
if (refund > 0)
{
fee -= refund;
ret = CreateRefund(sender, refund);
}
this.logger.LogTrace("(-)");
return(fee, ret);
}
public (Money, List <TxOut>) Process(ContractTxData contractTxData,
ulong mempoolFee, uint160 sender,
Gas gasConsumed,
Exception exception)
{
this.logger.LogTrace("(){0}:{1}", nameof(mempoolFee), mempoolFee);
Money fee = mempoolFee;
var refunds = new List <TxOut>();
if (exception is OutOfGasException)
{
this.logger.LogTrace("(-)[OUTOFGAS_EXCEPTION]");
return(fee, refunds);
}
var refund = new Money(contractTxData.GasCostBudget - (gasConsumed * contractTxData.GasPrice));
this.logger.LogTrace("{0}:{1},{2}:{3},{4}:{5},{6}:{7}", nameof(contractTxData.GasCostBudget), contractTxData.GasCostBudget, nameof(gasConsumed), gasConsumed, nameof(contractTxData.GasPrice), contractTxData.GasPrice, nameof(refund), refund);
if (refund > 0)
{
fee -= refund;
refunds.Add(CreateRefund(sender, refund));
}
this.logger.LogTrace("(-)");
return(fee, refunds);
}
public byte[] Serialize(ContractTxData contractTxData)
{
var bytes = new List <byte>
{
contractTxData.OpCodeType
};
bytes.AddRange(PrefixLength(BitConverter.GetBytes(contractTxData.VmVersion)));
bytes.AddRange(PrefixLength(BitConverter.GetBytes(contractTxData.GasPrice)));
bytes.AddRange(PrefixLength(BitConverter.GetBytes(contractTxData.GasLimit)));
if (contractTxData.OpCodeType == (byte)ScOpcodeType.OP_CALLCONTRACT)
{
bytes.AddRange(PrefixLength(contractTxData.ContractAddress.ToBytes()));
bytes.AddRange(PrefixLength(Encoding.UTF8.GetBytes(contractTxData.MethodName)));
}
if (contractTxData.OpCodeType == (byte)ScOpcodeType.OP_CREATECONTRACT)
{
bytes.AddRange(PrefixLength(contractTxData.ContractExecutionCode));
}
if (contractTxData.MethodParameters != null && contractTxData.MethodParameters.Any())
{
bytes.AddRange(PrefixLength(this.MethodParamSerializer.Serialize(contractTxData.MethodParameters)));
}
else
{
bytes.AddRange(BitConverter.GetBytes(0));
}
return(bytes.ToArray());
}
private void SerializePrefix(byte[] bytes, ContractTxData contractTxData)
{
byte[] vmVersion = this.primitiveSerializer.Serialize(contractTxData.VmVersion);
byte[] gasPrice = this.primitiveSerializer.Serialize(contractTxData.GasPrice);
byte[] gasLimit = this.primitiveSerializer.Serialize(contractTxData.GasLimit.Value);
bytes[0] = contractTxData.OpCodeType;
vmVersion.CopyTo(bytes, OpcodeSize);
gasPrice.CopyTo(bytes, OpcodeSize + VmVersionSize);
gasLimit.CopyTo(bytes, OpcodeSize + VmVersionSize + GasPriceSize);
}
private Result <ContractTxData> SerializeCreateContract(byte[] smartContractBytes, int vmVersion, ulong gasPrice, Gas gasLimit)
{
var remaining = smartContractBytes.Slice(PrefixSize, (uint)(smartContractBytes.Length - PrefixSize));
IList <byte[]> decodedParams = RLPDecode(remaining);
var contractExecutionCode = this.primitiveSerializer.Deserialize <byte[]>(decodedParams[0]);
var methodParameters = this.DeserializeMethodParameters(decodedParams[1]);
var callData = new ContractTxData(vmVersion, gasPrice, gasLimit, contractExecutionCode, methodParameters);
return(Result.Ok(callData));
}
private Result <ContractTxData> SerializeCallContract(byte[] smartContractBytes, int vmVersion, ulong gasPrice, Gas gasLimit)
{
var contractAddressBytes = smartContractBytes.Slice(PrefixSize, AddressSize);
var contractAddress = new uint160(contractAddressBytes);
var remaining = smartContractBytes.Slice(CallContractPrefixSize,
(uint)(smartContractBytes.Length - CallContractPrefixSize));
IList <byte[]> decodedParams = RLPDecode(remaining);
var methodName = this.primitiveSerializer.Deserialize <string>(decodedParams[0]);
var methodParameters = this.DeserializeMethodParameters(decodedParams[1]);
var callData = new ContractTxData(vmVersion, gasPrice, gasLimit, contractAddress, methodName, methodParameters);
return(Result.Ok(callData));
}
private byte[] SerializeCreateContract(ContractTxData contractTxData)
{
var rlpBytes = new List <byte[]>();
rlpBytes.Add(contractTxData.ContractExecutionCode);
this.AddMethodParams(rlpBytes, contractTxData.MethodParameters);
var encoded = RLP.EncodeList(rlpBytes.Select(RLP.EncodeElement).ToArray());
var bytes = new byte[PrefixSize + encoded.Length];
this.SerializePrefix(bytes, contractTxData);
encoded.CopyTo(bytes, PrefixSize);
return(bytes);
}
public Result <ContractTxData> Deserialize(byte[] smartContractBytes)
{
try
{
var byteCursor = 1;
var takeLength = 0;
var type = smartContractBytes[0];
var vmVersion = Deserialize <int>(smartContractBytes, ref byteCursor, ref takeLength);
var gasPrice = (Gas)Deserialize <ulong>(smartContractBytes, ref byteCursor, ref takeLength);
var gasLimit = (Gas)Deserialize <ulong>(smartContractBytes, ref byteCursor, ref takeLength);
if (IsCallContract(type))
{
var contractAddress = Deserialize <uint160>(smartContractBytes, ref byteCursor, ref takeLength);
var methodName = Deserialize <string>(smartContractBytes, ref byteCursor, ref takeLength);
var methodParametersRaw = Deserialize <string>(smartContractBytes, ref byteCursor, ref takeLength);
var methodParameters = this.DeserializeMethodParameters(methodParametersRaw);
var callData = new ContractTxData(vmVersion, gasPrice, gasLimit, contractAddress, methodName, methodParametersRaw, methodParameters);
return(Result.Ok(callData));
}
if (IsCreateContract(type))
{
var contractExecutionCode = Deserialize <byte[]>(smartContractBytes, ref byteCursor, ref takeLength);
var methodParametersRaw = Deserialize <string>(smartContractBytes, ref byteCursor, ref takeLength);
var methodParameters = this.DeserializeMethodParameters(methodParametersRaw);
var callData = new ContractTxData(vmVersion, gasPrice, gasLimit, contractExecutionCode, methodParametersRaw, methodParameters);
return(Result.Ok(callData));
}
}
catch (Exception e)
{
// TODO: Avoid this catch all exceptions
return(Result.Fail <ContractTxData>("Error deserializing calldata. " + e.Message));
}
return(Result.Fail <ContractTxData>("Error deserializing calldata. Incorrect first byte."));
}
private byte[] SerializeCallContract(ContractTxData contractTxData)
{
var rlpBytes = new List <byte[]>();
rlpBytes.Add(this.primitiveSerializer.Serialize(contractTxData.MethodName));
this.AddMethodParams(rlpBytes, contractTxData.MethodParameters);
var encoded = RLP.EncodeList(rlpBytes.Select(RLP.EncodeElement).ToArray());
var bytes = new byte[CallContractPrefixSize + encoded.Length];
this.SerializePrefix(bytes, contractTxData);
contractTxData.ContractAddress.ToBytes().CopyTo(bytes, PrefixSize);
encoded.CopyTo(bytes, CallContractPrefixSize);
return(bytes);
}
/// <summary>
/// Instantiates a <see cref="ScOpcodeType.OP_CREATECONTRACT"/> smart contract carrier.
/// </summary>
public static ContractCarrier CreateContract(int vmVersion, byte[] contractExecutionCode, ulong gasPrice,
Gas gasLimit, string[] methodParameters = null)
{
if (contractExecutionCode == null)
{
throw new SmartContractCarrierException(nameof(contractExecutionCode) + " is null");
}
var serializer = new MethodParameterSerializer();
string methodParams = GetMethodParams(serializer, methodParameters);
var callData = new ContractTxData(vmVersion, gasPrice, gasLimit, contractExecutionCode, methodParams);
var carrier = new ContractCarrier(new MethodParameterSerializer());
carrier.ContractTxData = callData;
if (!string.IsNullOrWhiteSpace(methodParams))
{
carrier.MethodParameters = serializer.ToObjects(methodParams);
}
return(carrier);
}
public ISmartContractExecutionResult Execute(ISmartContractTransactionContext transactionContext)
{
this.logger.LogTrace("()");
// Deserialization can't fail because this has already been through SmartContractFormatRule.
Result <ContractTxData> callDataDeserializationResult = this.serializer.Deserialize(transactionContext.ScriptPubKey.ToBytes());
ContractTxData callData = callDataDeserializationResult.Value;
var gasMeter = new GasMeter(callData.GasLimit);
gasMeter.Spend((Gas)GasPriceList.BaseCost);
var context = new TransactionContext(
transactionContext.TransactionHash,
transactionContext.BlockHeight,
transactionContext.CoinbaseAddress,
transactionContext.Sender,
transactionContext.TxOutValue);
var creation = IsCreateContract(callData);
VmExecutionResult result = creation
? this.vm.Create(gasMeter, this.stateSnapshot, callData, context)
: this.vm.ExecuteMethod(gasMeter, this.stateSnapshot, callData, context);
var revert = result.ExecutionException != null;
Transaction internalTransaction = this.transferProcessor.Process(
this.stateSnapshot,
creation ? result.NewContractAddress : callData.ContractAddress,
transactionContext,
result.InternalTransfers,
revert);
(Money fee, List <TxOut> refundTxOuts) = this.refundProcessor.Process(
callData,
transactionContext.MempoolFee,
transactionContext.Sender,
result.GasConsumed,
result.ExecutionException);
var executionResult = new SmartContractExecutionResult
{
NewContractAddress = !revert && creation ? result.NewContractAddress : null,
Exception = result.ExecutionException,
GasConsumed = result.GasConsumed,
Return = result.Result,
InternalTransaction = internalTransaction,
Fee = fee,
Refunds = refundTxOuts,
Logs = result.RawLogs.ToLogs(this.contractPrimitiveSerializer)
};
if (revert)
{
this.logger.LogTrace("(-)[CONTRACT_EXECUTION_FAILED]");
this.stateSnapshot.Rollback();
}
else
{
this.logger.LogTrace("(-)[CONTRACT_EXECUTION_SUCCEEDED]");
this.stateSnapshot.Commit();
}
return(executionResult);
}
private static bool IsCreateContract(ContractTxData contractTxData)
{
return(contractTxData.OpCodeType == (byte)ScOpcodeType.OP_CREATECONTRACT);
}
public byte[] Serialize(ContractTxData contractTxData)
{
return(IsCallContract(contractTxData.OpCodeType)
? this.SerializeCallContract(contractTxData)
: this.SerializeCreateContract(contractTxData));
}
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);
}