public virtual void CheckInputs(Transaction tx, UnspentOutputSet inputs, int nSpendHeight)
{
if (!inputs.HaveInputs(tx))
{
ConsensusErrors.BadTransactionMissingInput.Throw();
}
Money nValueIn = Money.Zero;
Money nFees = Money.Zero;
for (int i = 0; i < tx.Inputs.Count; i++)
{
var prevout = tx.Inputs[i].PrevOut;
var coins = inputs.AccessCoins(prevout.Hash);
// If prev is coinbase, check that it's matured
if (coins.IsCoinbase)
{
if (nSpendHeight - coins.Height < this.consensusOptions.COINBASE_MATURITY)
{
ConsensusErrors.BadTransactionPrematureCoinbaseSpending.Throw();
}
}
if (coins.IsCoinstake)
{
if (nSpendHeight - coins.Height < this.consensusOptions.COINBASE_MATURITY)
{
ConsensusErrors.BadTransactionPrematureCoinstakeSpending.Throw();
}
}
// Check for negative or overflow input values
nValueIn += coins.TryGetOutput(prevout.N).Value;
if (!MoneyRange(coins.TryGetOutput(prevout.N).Value) || !MoneyRange(nValueIn))
{
ConsensusErrors.BadTransactionInputValueOutOfRange.Throw();
}
}
if (nValueIn < tx.TotalOut)
{
ConsensusErrors.BadTransactionInBelowOut.Throw();
}
// Tally transaction fees
Money nTxFee = nValueIn - tx.TotalOut;
if (nTxFee < 0)
{
ConsensusErrors.BadTransactionNegativeFee.Throw();
}
nFees += nTxFee;
if (!MoneyRange(nFees))
{
ConsensusErrors.BadTransactionFeeOutOfRange.Throw();
}
}
public virtual void CheckInputs(Transaction tx, UnspentOutputSet inputs, int nSpendHeight)
{
if (!inputs.HaveInputs(tx))
{
ConsensusErrors.BadTransactionMissingInput.Throw();
}
Money nValueIn = Money.Zero;
Money nFees = Money.Zero;
for (int i = 0; i < tx.Inputs.Count; i++)
{
var prevout = tx.Inputs[i].PrevOut;
var coins = inputs.AccessCoins(prevout.Hash);
this.CheckMaturity(coins, nSpendHeight);
// Check for negative or overflow input values
nValueIn += coins.TryGetOutput(prevout.N).Value;
if (!MoneyRange(coins.TryGetOutput(prevout.N).Value) || !MoneyRange(nValueIn))
{
ConsensusErrors.BadTransactionInputValueOutOfRange.Throw();
}
}
if (nValueIn < tx.TotalOut)
{
ConsensusErrors.BadTransactionInBelowOut.Throw();
}
// Tally transaction fees
Money nTxFee = nValueIn - tx.TotalOut;
if (nTxFee < 0)
{
ConsensusErrors.BadTransactionNegativeFee.Throw();
}
nFees += nTxFee;
if (!MoneyRange(nFees))
{
ConsensusErrors.BadTransactionFeeOutOfRange.Throw();
}
}
public virtual void ExecuteBlock(ContextInformation context, TaskScheduler taskScheduler)
{
Block block = context.BlockResult.Block;
ChainedBlock index = context.BlockResult.ChainedBlock;
ConsensusFlags flags = context.Flags;
UnspentOutputSet view = context.Set;
PerformanceCounter.AddProcessedBlocks(1);
taskScheduler = taskScheduler ?? TaskScheduler.Default;
if (flags.EnforceBIP30)
{
foreach (var tx in block.Transactions)
{
var coins = view.AccessCoins(tx.GetHash());
if (coins != null && !coins.IsPrunable)
{
ConsensusErrors.BadTransactionBIP30.Throw();
}
}
}
long nSigOpsCost = 0;
Money nFees = Money.Zero;
List <Task <bool> > checkInputs = new List <Task <bool> >();
for (int i = 0; i < block.Transactions.Count; i++)
{
PerformanceCounter.AddProcessedTransactions(1);
var tx = block.Transactions[i];
if (!tx.IsCoinBase && !tx.IsCoinStake)
{
int[] prevheights;
if (!view.HaveInputs(tx))
{
ConsensusErrors.BadTransactionMissingInput.Throw();
}
prevheights = new int[tx.Inputs.Count];
// Check that transaction is BIP68 final
// BIP68 lock checks (as opposed to nLockTime checks) must
// be in ConnectBlock because they require the UTXO set
for (var j = 0; j < tx.Inputs.Count; j++)
{
prevheights[j] = (int)view.AccessCoins(tx.Inputs[j].PrevOut.Hash).Height;
}
if (!tx.CheckSequenceLocks(prevheights, index, flags.LockTimeFlags))
{
ConsensusErrors.BadTransactionNonFinal.Throw();
}
}
// GetTransactionSigOpCost counts 3 types of sigops:
// * legacy (always)
// * p2sh (when P2SH enabled in flags and excludes coinbase)
// * witness (when witness enabled in flags and excludes coinbase)
nSigOpsCost += GetTransactionSigOpCost(tx, view, flags);
if (nSigOpsCost > this.consensusOptions.MAX_BLOCK_SIGOPS_COST)
{
ConsensusErrors.BadBlockSigOps.Throw();
}
if (!tx.IsCoinBase && !tx.IsCoinStake)
{
CheckInputs(tx, view, index.Height);
nFees += view.GetValueIn(tx) - tx.TotalOut;
int ii = i;
var localTx = tx;
PrecomputedTransactionData txData = new PrecomputedTransactionData(tx);
for (int iInput = 0; iInput < tx.Inputs.Count; iInput++)
{
PerformanceCounter.AddProcessedInputs(1);
var input = tx.Inputs[iInput];
int iiIntput = iInput;
var txout = view.GetOutputFor(input);
var checkInput = new Task <bool>(() =>
{
if (UseConsensusLib)
{
Script.BitcoinConsensusError error;
return(Script.VerifyScriptConsensus(txout.ScriptPubKey, tx, (uint)iiIntput, flags.ScriptFlags, out error));
}
else
{
var checker = new TransactionChecker(tx, iiIntput, txout.Value, txData);
var ctx = new ScriptEvaluationContext();
ctx.ScriptVerify = flags.ScriptFlags;
return(ctx.VerifyScript(input.ScriptSig, txout.ScriptPubKey, checker));
}
});
checkInput.Start(taskScheduler);
checkInputs.Add(checkInput);
}
}
if (tx.IsCoinStake)
{
context.Stake.TotalCoinStakeValueIn = view.GetValueIn(tx);
}
view.Update(tx, index.Height);
}
this.CheckBlockReward(context, nFees, index, block);
var passed = checkInputs.All(c => c.GetAwaiter().GetResult());
if (!passed)
{
ConsensusErrors.BadTransactionScriptError.Throw();
}
}
