public override Task RunAsync(RuleContext context)
{
Block block = context.ValidationContext.BlockToValidate;
IEnumerable <Transaction> opSpendTransactions = block.Transactions.Where(tx =>
tx.IsSmartContractSpendTransaction());
foreach (Transaction opSpendTransaction in opSpendTransactions)
{
var thisIndex = block.Transactions.IndexOf(opSpendTransaction);
if (thisIndex <= 0)
{
this.Throw();
}
;
Transaction previousTransaction = block.Transactions[thisIndex - 1];
// This previously would only check that the contract was a call. However we also have to check for create as inside the constructor
// we could make a call to another contract and that could send funds!
var previousWasOpCall = previousTransaction.Outputs.Any(o => SmartContractScript.IsSmartContractExec(o.ScriptPubKey));
if (!previousWasOpCall)
{
this.Throw();
}
}
return(Task.CompletedTask);
}
private void CheckTransaction(Transaction transaction)
{
var smartContractExecCount = transaction.Outputs.Count(o => SmartContractScript.IsSmartContractExec(o.ScriptPubKey));
if (smartContractExecCount > 1)
{
new ConsensusError("multiple-smartcontractexec-outputs", "transaction contains multiple smartcontractexec outputs").Throw();
}
}