public void TestAdd()
{
TestStorage storage = new TestStorage();
storage.AddUnspentOutput(new UnspentOutput(0, Hash1, 0, 100, new byte[16]));
UnspentOutputsUpdate update = new UnspentOutputsUpdate(storage);
Assert.Throws<InvalidOperationException>(() => update.Add(new UnspentOutput(0, Hash1, 0, 200, new byte[16])));
update.Add(new UnspentOutput(0, Hash1, 1, 201, new byte[16]));
update.Add(new UnspentOutput(0, Hash2, 0, 300, new byte[16]));
update.Add(new UnspentOutput(0, Hash2, 1, 301, new byte[16]));
Assert.Throws<InvalidOperationException>(() => update.Add(new UnspentOutput(0, Hash1, 0, 250, new byte[16])));
Assert.Throws<InvalidOperationException>(() => update.Add(new UnspentOutput(0, Hash1, 1, 251, new byte[16])));
Assert.Throws<InvalidOperationException>(() => update.Add(new UnspentOutput(0, Hash2, 0, 350, new byte[16])));
Assert.Throws<InvalidOperationException>(() => update.Add(new UnspentOutput(0, Hash2, 1, 351, new byte[16])));
Assert.That(update.FindUnspentOutputs(Hash1).Select(o => o.Sum).ToList(), Is.EquivalentTo(new ulong[] {100, 201}));
Assert.That(update.FindUnspentOutputs(Hash2).Select(o => o.Sum).ToList(), Is.EquivalentTo(new ulong[] {300, 301}));
Assert.That(update.FindUnspentOutput(Hash1, 0).Sum, Is.EqualTo(100));
Assert.That(update.FindUnspentOutput(Hash1, 1).Sum, Is.EqualTo(201));
Assert.That(update.FindUnspentOutput(Hash2, 0).Sum, Is.EqualTo(300));
Assert.That(update.FindUnspentOutput(Hash2, 1).Sum, Is.EqualTo(301));
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100}));
Assert.That(storage.SpentOutputs, Is.Empty);
update.Persist();
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100, 201, 300, 301}));
Assert.That(storage.SpentOutputs, Is.Empty);
}
private UnspentOutputsUpdate PrepareUnspentOutputsUpdate(StoredBlock block, BlockMessage blockMessage)
{
ScriptParser parser = new ScriptParser();
ulong inputsSum = GetBlockReward(block);
ulong outputsSum = 0;
UnspentOutputsUpdate update = new UnspentOutputsUpdate(storage);
for (int transactionNumber = 0; transactionNumber < blockMessage.Transactions.Length; transactionNumber++)
{
Tx transaction = blockMessage.Transactions[transactionNumber];
ulong transactionInputsSum = 0;
ulong transactionOutputsSum = 0;
byte[] transactionHash = CryptoUtils.DoubleSha256(BitcoinStreamWriter.GetBytes(transaction.Write));
List<UnspentOutput> unspentOutputs = update.FindUnspentOutputs(transactionHash);
if (unspentOutputs.Any())
{
//todo: use network settings
if (block.Height == 91842 || block.Height == 91880)
{
// this blocks are exceptions from BIP-30
foreach (UnspentOutput unspentOutput in unspentOutputs)
{
update.Spend(unspentOutput.TransactionHash, unspentOutput.OutputNumber, block);
}
}
else
{
throw new BitcoinProtocolViolationException(
$"The transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" has same hash as an existing unspent transaction (see BIP-30).");
}
}
//todo: check transaction hash against genesis block transaction hash
if (transactionNumber != 0)
{
foreach (TxIn input in transaction.Inputs)
{
UnspentOutput output = update.FindUnspentOutput(input.PreviousOutput.Hash, input.PreviousOutput.Index);
if (output == null)
{
throw new BitcoinProtocolViolationException(
$"The input of the transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" has been already spent or did not exist.");
}
//todo: check for overflow
transactionInputsSum += output.Sum;
List<ScriptCommand> inputCommands;
if (!parser.TryParse(input.SignatureScript, out inputCommands))
{
throw new BitcoinProtocolViolationException(
$"The transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" has an invalid signature script.");
}
if (inputCommands.Any(c => !IsValidSignatureCommand(c.Code)))
{
throw new BitcoinProtocolViolationException(
$"The transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" has forbidden commands in the signature script.");
}
//todo: check signature for the output
update.Spend(output.TransactionHash, output.OutputNumber, block);
}
}
for (int outputNumber = 0; outputNumber < transaction.Outputs.Length; outputNumber++)
{
TxOut output = transaction.Outputs[outputNumber];
//todo: check for overflow
transactionOutputsSum += output.Value;
List<ScriptCommand> commands;
if (!parser.TryParse(output.PubkeyScript, out commands))
{
//todo: how Bitcoin Core works in this scenario?
throw new BitcoinProtocolViolationException(
$"The output of transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" has an invalid pubkey script script.");
}
UnspentOutput unspentOutput = UnspentOutput.Create(block, transaction, outputNumber);
update.Add(unspentOutput);
}
if (transactionNumber != 0 && transactionInputsSum < transactionOutputsSum)
{
// for coinbase transaction output sum is checked later as part of total block inputs, outputs and reward sums equation
throw new BitcoinProtocolViolationException(
$"The sum of the inputs in the transaction '{BitConverter.ToString(transactionHash)}'" +
$" in block '{BitConverter.ToString(block.Hash)}'" +
$" is less than the sum of the outputs.");
}
//todo: check for overflow
inputsSum += transactionInputsSum;
//todo: check for overflow
outputsSum += transactionOutputsSum;
}
if (inputsSum != outputsSum)
{
throw new BitcoinProtocolViolationException(
$"The sum of the inputs and the reward" +
$" in the block '{BitConverter.ToString(block.Hash)}'" +
$" does not match the sum of the outputs.");
}
return update;
}
public void TestOverwrite()
{
TestStorage storage = new TestStorage();
storage.AddUnspentOutput(new UnspentOutput(0, Hash1, 0, 100, new byte[16]));
storage.AddUnspentOutput(new UnspentOutput(0, Hash1, 1, 101, new byte[16]));
UnspentOutputsUpdate update = new UnspentOutputsUpdate(storage);
update.Spend(Hash1, 0, Block1);
update.Spend(Hash1, 1, Block1);
update.Add(new UnspentOutput(1, Hash1, 0, 200, new byte[16]));
Assert.That(update.FindUnspentOutputs(Hash1).Select(o => o.Sum), Is.EqualTo(new ulong[] {200}));
Assert.That(update.FindUnspentOutput(Hash1, 0).Sum, Is.EqualTo(200));
Assert.That(update.FindUnspentOutput(Hash1, 1), Is.Null);
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100, 101}));
Assert.That(storage.SpentOutputs, Is.Empty);
update.Persist();
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {200}));
Assert.That(storage.SpentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100, 101}));
update = new UnspentOutputsUpdate(storage);
update.Spend(Hash1, 0, Block2);
update.Add(new UnspentOutput(2, Hash1, 0, 300, new byte[16]));
update.Spend(Hash1, 0, Block2);
update.Add(new UnspentOutput(2, Hash1, 0, 350, new byte[16]));
Assert.That(update.FindUnspentOutputs(Hash1).Select(o => o.Sum), Is.EquivalentTo(new ulong[] {350}));
Assert.That(update.FindUnspentOutput(Hash1, 0).Sum, Is.EqualTo(350));
Assert.That(update.FindUnspentOutput(Hash1, 1), Is.Null);
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {200}));
Assert.That(storage.SpentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100, 101}));
update.Persist();
Assert.That(storage.UnspentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {350}));
Assert.That(storage.SpentOutputs.Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100, 101, 200}));
}
public void TestFindExistingOutputs()
{
TestStorage storage = new TestStorage();
storage.AddUnspentOutput(new UnspentOutput(0, Hash1, 1, 100, new byte[16]));
UnspentOutputsUpdate update = new UnspentOutputsUpdate(storage);
Assert.That(update.FindUnspentOutputs(Hash1).Select(o => o.Sum), Is.EquivalentTo(new ulong[] {100}));
Assert.That(update.FindUnspentOutputs(Hash2), Is.Empty);
}