/// <summary>
/// Applies an externally generated contract creation message to the current state.
/// </summary>
public StateTransitionResult Apply(IState state, ExternalCreateMessage message)
{
var gasMeter = new GasMeter(message.GasLimit);
gasMeter.Spend((Gas)GasPriceList.CreateCost);
// We need to generate an address here so that we can set the initial balance.
uint160 address = state.GenerateAddress(this.AddressGenerator);
// For external creates 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, address, message.Amount));
return(ApplyCreate(state, message.Parameters, message.Code, message, address, gasMeter));
}
/// <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));
}
/// <summary>
/// Applies an internally generated contract funds transfer message to the current state.
/// </summary>
public StateTransitionResult Apply(IState state, ContractTransferMessage message)
{
bool enoughBalance = this.EnsureSenderHasEnoughBalance(state, message.From, message.Amount);
if (!enoughBalance)
{
return(StateTransitionResult.Fail((Gas)0, StateTransitionErrorKind.InsufficientBalance));
}
var gasMeter = new GasMeter(message.GasLimit);
// If it's not a contract, create a regular P2PKH tx
// If it is a contract, do a regular contract call
byte[] contractCode = state.ContractState.GetCode(message.To);
if (contractCode == null || contractCode.Length == 0)
{
gasMeter.Spend((Gas)GasPriceList.TransferCost);
// No contract at this address, create a regular P2PKH xfer
state.AddInternalTransfer(new TransferInfo(message.From, message.To, message.Amount));
return(StateTransitionResult.Ok(gasMeter.GasConsumed, message.To));
}
var observer = new Observer(gasMeter, new MemoryMeter(ReflectionVirtualMachine.MemoryUnitLimit));
var executionContext = new ExecutionContext(observer);
// For internal contract-contract transfers 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.
state.AddInternalTransfer(new TransferInfo(message.From, message.To, message.Amount));
gasMeter.Spend((Gas)GasPriceList.BaseCost);
StateTransitionResult result = this.ApplyCall(state, message, contractCode, executionContext);
return(result);
}