///<inheritdoc />
public ITransferResult TransferFunds(ISmartContractState smartContractState, Address addressTo, ulong amountToTransfer, TransferFundsToContract contractDetails)
{
this.logger.LogTrace("({0}:{1},{2}:{3})", nameof(addressTo), addressTo, nameof(amountToTransfer), amountToTransfer);
// TODO: Spend BaseFee here
var balance = smartContractState.GetBalance();
if (balance < amountToTransfer)
{
this.logger.LogTrace("(-)[INSUFFICIENT_BALANCE]:{0}={1}", nameof(balance), balance);
throw new InsufficientBalanceException();
}
// Discern whether this is a contract or an ordinary address.
byte[] contractCode = this.contractStateRepository.GetCode(addressTo.ToUint160(this.network));
if (contractCode == null || contractCode.Length == 0)
{
this.internalTransferList.Add(new TransferInfo
{
From = smartContractState.Message.ContractAddress.ToUint160(this.network),
To = addressTo.ToUint160(this.network),
Value = amountToTransfer
});
this.logger.LogTrace("(-)[TRANSFER_TO_SENDER]:Transfer {0} from {1} to {2}.", smartContractState.Message.ContractAddress, addressTo, amountToTransfer);
return(TransferResult.Empty());
}
this.logger.LogTrace("(-)[TRANSFER_TO_CONTRACT]");
return(ExecuteTransferFundsToContract(contractCode, smartContractState, addressTo, amountToTransfer, contractDetails));
}
///<inheritdoc />
public ITransferResult Transfer(ISmartContractState smartContractState, Address addressTo, ulong amountToTransfer)
{
this.logger.LogTrace("({0}:{1},{2}:{3})", nameof(addressTo), addressTo, nameof(amountToTransfer), amountToTransfer);
// TODO: Spend BaseFee here
EnsureContractHasEnoughBalance(smartContractState, amountToTransfer);
// Discern whether this is a contract or an ordinary address.
byte[] contractCode = this.contractStateRepository.GetCode(addressTo.ToUint160(this.network));
if (contractCode == null || contractCode.Length == 0)
{
this.internalTransferList.Add(new TransferInfo
{
From = smartContractState.Message.ContractAddress.ToUint160(this.network),
To = addressTo.ToUint160(this.network),
Value = amountToTransfer
});
this.logger.LogTrace("(-)[TRANSFER_TO_SENDER]:Transfer {0} from {1} to {2}.", smartContractState.Message.ContractAddress, addressTo, amountToTransfer);
return(TransferResult.Empty());
}
this.logger.LogTrace("(-)[TRANSFER_TO_CONTRACT]");
// Calling a receive handler:
string methodName = MethodCall.ExternalReceiveHandlerName;
object[] parameters = new object[] { };
ulong gasBudget = DefaultGasLimit; // for Transfer always send limited gas to prevent re-entrance.
return(ExecuteTransferFundsToContract(contractCode, smartContractState, addressTo, amountToTransfer, methodName, parameters, gasBudget));
}
///<inheritdoc />
public ITransferResult Transfer(ISmartContractState smartContractState, Address addressTo, ulong amountToTransfer)
{
this.logger.LogTrace("({0}:{1},{2}:{3})", nameof(addressTo), addressTo, nameof(amountToTransfer), amountToTransfer);
ulong gasBudget = DefaultGasLimit; // for Transfer always send limited gas to prevent re-entrance.
var message = new ContractTransferMessage(
addressTo.ToUint160(this.network),
smartContractState.Message.ContractAddress.ToUint160(this.network),
amountToTransfer,
(Gas)gasBudget
);
var result = this.state.Apply(message);
return(result.IsSuccess
? TransferResult.Empty()
: TransferResult.Failed());
}
///<inheritdoc />
public ITransferResult Transfer(ISmartContractState smartContractState, Address addressTo, ulong amountToTransfer)
{
this.logger.LogTrace("({0}:{1},{2}:{3})", nameof(addressTo), addressTo, nameof(amountToTransfer), amountToTransfer);
ulong gasBudget = DefaultGasLimit; // for Transfer always send limited gas to prevent re-entrance.
Gas gasRemaining = smartContractState.GasMeter.GasAvailable;
if (gasRemaining < gasBudget || gasRemaining < GasPriceList.BaseCost)
{
return(TransferResult.Failed());
}
var message = new ContractTransferMessage(
addressTo.ToUint160(this.network),
smartContractState.Message.ContractAddress.ToUint160(this.network),
amountToTransfer,
(Gas)gasBudget
);
// Create a snapshot of the current state
IState newState = this.state.Snapshot();
// Apply the message to the snapshot
StateTransitionResult result = this.stateProcessor.Apply(newState, message);
// Transition the current state to the new state
if (result.IsSuccess)
{
this.state.TransitionTo(newState);
}
smartContractState.GasMeter.Spend(result.GasConsumed);
return(result.IsSuccess
? TransferResult.Empty()
: TransferResult.Failed());
}
///<inheritdoc />
public ITransferResult Transfer(ISmartContractState smartContractState, Address addressTo, ulong amountToTransfer)
{
Gas gasRemaining = smartContractState.GasMeter.GasAvailable;
if (gasRemaining < GasPriceList.TransferCost)
{
return(TransferResult.Failed());
}
ulong gasBudget = (gasRemaining < DefaultGasLimit)
? gasRemaining // have enough for at least a transfer but not for the DefaultGasLimit
: DefaultGasLimit; // have enough for anything
var message = new ContractTransferMessage(
addressTo.ToUint160(),
smartContractState.Message.ContractAddress.ToUint160(),
amountToTransfer,
(Gas)gasBudget
);
// Create a snapshot of the current state
IState newState = this.state.Snapshot();
// Apply the message to the snapshot
StateTransitionResult result = this.stateProcessor.Apply(newState, message);
// Transition the current state to the new state
if (result.IsSuccess)
{
this.state.TransitionTo(newState);
}
smartContractState.GasMeter.Spend(result.GasConsumed);
return(result.IsSuccess
? TransferResult.Empty()
: TransferResult.Failed());
}
///<inheritdoc />
public ITransferResult Call(
ISmartContractState smartContractState,
Address addressTo,
ulong amountToTransfer,
string methodName,
object[] parameters,
ulong gasLimit = 0)
{
// TODO: Spend BaseFee here
EnsureContractHasEnoughBalance(smartContractState, amountToTransfer);
byte[] contractCode = this.contractStateRepository.GetCode(addressTo.ToUint160(this.network));
if (contractCode == null || contractCode.Length == 0)
{
return(TransferResult.Empty());
}
// Here, we know contract has code, so we execute it
// For a method call, send all the gas unless an amount was selected.Should only call trusted methods so re - entrance is less problematic.
ulong gasBudget = (gasLimit != 0) ? gasLimit : smartContractState.GasMeter.GasAvailable;
return(ExecuteTransferFundsToContract(contractCode, smartContractState, addressTo, amountToTransfer, methodName, parameters, gasBudget));
}
