/// <summary>
/// Applies an internally generated contract creation message to the current state.
/// </summary>
public StateTransitionResult Apply(IState state, InternalCreateMessage message)
{
bool enoughBalance = EnsureSenderHasEnoughBalance(state, message.From, message.Amount);
if (!enoughBalance)
{
return(StateTransitionResult.Fail((Gas)0, StateTransitionErrorKind.InsufficientBalance)); // Trivial - just return and let the MethodCall gas account for it.
}
var gasMeter = new GasMeter(message.GasLimit);
gasMeter.Spend((Gas)GasPriceList.CreateCost);
byte[] contractCode = state.ContractState.GetCode(message.From);
uint160 address = state.GenerateAddress(this.AddressGenerator);
// For internal creates we need to add the value contained in the contract invocation transaction
// to the internal transfer list. This must occur before we apply the message to the state.
// For external creates we do not need to do this.
state.AddInternalTransfer(new TransferInfo(message.From, address, message.Amount));
StateTransitionResult result = ApplyCreate(state, message.Parameters, contractCode, message, address, gasMeter, message.Type);
return(result);
}
///<inheritdoc />
public ICreateResult Create <T>(ISmartContractState smartContractState,
ulong amountToTransfer,
object[] parameters,
ulong gasLimit = 0)
{
Gas gasRemaining = this.gasMeter.GasAvailable;
// 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 : gasRemaining;
Debug.WriteLine("Gas budget:" + gasBudget);
if (gasRemaining < gasBudget || gasRemaining < GasPriceList.CreateCost)
{
return(CreateResult.Failed());
}
var message = new InternalCreateMessage(
smartContractState.Message.ContractAddress.ToUint160(),
amountToTransfer,
(Gas)gasBudget,
parameters,
typeof(T).Name
);
// 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);
}
this.gasMeter.Spend(result.GasConsumed);
return(result.IsSuccess
? CreateResult.Succeeded(result.Success.ContractAddress.ToAddress())
: CreateResult.Failed());
}