private void Unmint(IChainStateCursor chainStateCursor, Transaction tx, ChainedHeader chainedHeader)
{
// check that transaction exists
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(tx.Hash, out unspentTx))
{
// missing transaction output
logger.Warn($"Missing transaction at block {chainedHeader.Height:N0}, {chainedHeader.Hash}, tx {tx.Hash}");
throw new ValidationException(chainedHeader.Hash);
}
//TODO verify blockheight
// verify all outputs are unspent before unminting
if (!unspentTx.OutputStates.All(x => x == OutputState.Unspent))
{
throw new ValidationException(chainedHeader.Hash);
}
// remove the transaction
if (!chainStateCursor.TryRemoveUnspentTx(tx.Hash))
{
throw new ValidationException(chainedHeader.Hash);
}
// remove the tx outputs
for (var outputIndex = 0; outputIndex < tx.Outputs.Length; outputIndex++)
{
if (!chainStateCursor.TryRemoveUnspentTxOutput(new TxOutputKey(tx.Hash, (uint)outputIndex)))
{
throw new ValidationException(chainedHeader.Hash);
}
}
}
private PrevTxOutput Unspend(IChainStateCursor chainStateCursor, TxInput input, ChainedHeader chainedHeader)
{
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(input.PrevTxOutputKey.TxHash, out unspentTx))
{
// unable to rollback, the unspent tx has been pruned
//TODO better exception
throw new InvalidOperationException();
}
// retrieve previous output index
var outputIndex = unchecked ((int)input.PrevTxOutputKey.TxOutputIndex);
if (outputIndex < 0 || outputIndex >= unspentTx.OutputStates.Length)
{
throw new Exception("TODO - corruption");
}
// check that output isn't already considered unspent
if (unspentTx.OutputStates[outputIndex] == OutputState.Unspent)
{
throw new ValidationException(chainedHeader.Hash);
}
var wasFullySpent = unspentTx.IsFullySpent;
// mark output as unspent
unspentTx = unspentTx.SetOutputState(outputIndex, OutputState.Unspent);
// increment unspent output count
chainStateCursor.UnspentOutputCount++;
// update storage
var wasUpdated = chainStateCursor.TryUpdateUnspentTx(unspentTx);
if (!wasUpdated)
{
throw new ValidationException(chainedHeader.Hash);
}
// increment unspent tx count
if (wasFullySpent)
{
chainStateCursor.UnspentTxCount++;
}
TxOutput txOutput;
if (!chainStateCursor.TryGetUnspentTxOutput(input.PrevTxOutputKey, out txOutput))
{
// output missing
throw new ValidationException(chainedHeader.Hash);
}
return(new PrevTxOutput(txOutput, unspentTx));
}
private PrevTxOutput Spend(IChainStateCursor chainStateCursor, int txIndex, Transaction tx, int inputIndex, TxInput input, ChainedHeader chainedHeader, BlockSpentTxesBuilder blockSpentTxes)
{
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(input.PrevTxOutputKey.TxHash, out unspentTx))
{
// output wasn't present in utxo, invalid block
throw new ValidationException(chainedHeader.Hash);
}
var outputIndex = unchecked ((int)input.PrevTxOutputKey.TxOutputIndex);
if (outputIndex < 0 || outputIndex >= unspentTx.OutputStates.Length)
{
// output was out of bounds
throw new ValidationException(chainedHeader.Hash);
}
if (unspentTx.OutputStates[outputIndex] == OutputState.Spent)
{
// output was already spent
throw new ValidationException(chainedHeader.Hash);
}
// update output states
unspentTx = unspentTx.SetOutputState(outputIndex, OutputState.Spent);
// decrement unspent output count
chainStateCursor.UnspentOutputCount--;
// update transaction output states in the utxo
var wasUpdated = chainStateCursor.TryUpdateUnspentTx(unspentTx);
if (!wasUpdated)
{
throw new ValidationException(chainedHeader.Hash);
}
// store pruning information for a fully spent transaction
if (unspentTx.IsFullySpent)
{
blockSpentTxes.AddSpentTx(unspentTx.ToSpentTx());
// decrement unspent tx count
chainStateCursor.UnspentTxCount--;
}
TxOutput txOutput;
if (!chainStateCursor.TryGetUnspentTxOutput(input.PrevTxOutputKey, out txOutput))
{
// output missing
throw new ValidationException(chainedHeader.Hash);
}
return(new PrevTxOutput(txOutput, unspentTx));
}
private PrevTxOutput Unspend(IChainStateCursor chainStateCursor, TxInput input, ChainedHeader chainedHeader)
{
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(input.PrevTxOutputKey.TxHash, out unspentTx))
{
// unable to rollback, the unspent tx has been pruned
//TODO better exception
throw new InvalidOperationException();
}
// retrieve previous output index
var outputIndex = unchecked((int)input.PrevTxOutputKey.TxOutputIndex);
if (outputIndex < 0 || outputIndex >= unspentTx.OutputStates.Length)
throw new Exception("TODO - corruption");
// check that output isn't already considered unspent
if (unspentTx.OutputStates[outputIndex] == OutputState.Unspent)
throw new ValidationException(chainedHeader.Hash);
var wasFullySpent = unspentTx.IsFullySpent;
// mark output as unspent
unspentTx = unspentTx.SetOutputState(outputIndex, OutputState.Unspent);
// increment unspent output count
chainStateCursor.UnspentOutputCount++;
// update storage
var wasUpdated = chainStateCursor.TryUpdateUnspentTx(unspentTx);
if (!wasUpdated)
throw new ValidationException(chainedHeader.Hash);
// increment unspent tx count
if (wasFullySpent)
chainStateCursor.UnspentTxCount++;
TxOutput txOutput;
if (!chainStateCursor.TryGetUnspentTxOutput(input.PrevTxOutputKey, out txOutput))
// output missing
throw new ValidationException(chainedHeader.Hash);
return new PrevTxOutput(txOutput, unspentTx);
}
private void Unmint(IChainStateCursor chainStateCursor, Transaction tx, ChainedHeader chainedHeader)
{
// check that transaction exists
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(tx.Hash, out unspentTx))
{
// missing transaction output
logger.Warn($"Missing transaction at block {chainedHeader.Height:N0}, {chainedHeader.Hash}, tx {tx.Hash}");
throw new ValidationException(chainedHeader.Hash);
}
//TODO verify blockheight
// verify all outputs are unspent before unminting
if (!unspentTx.OutputStates.All(x => x == OutputState.Unspent))
{
throw new ValidationException(chainedHeader.Hash);
}
// remove the transaction
if (!chainStateCursor.TryRemoveUnspentTx(tx.Hash))
{
throw new ValidationException(chainedHeader.Hash);
}
// remove the tx outputs
for (var outputIndex = 0; outputIndex < tx.Outputs.Length; outputIndex++)
{
if (!chainStateCursor.TryRemoveUnspentTxOutput(new TxOutputKey(tx.Hash, (uint)outputIndex)))
throw new ValidationException(chainedHeader.Hash);
}
}
private PrevTxOutput Spend(IChainStateCursor chainStateCursor, int txIndex, Transaction tx, int inputIndex, TxInput input, ChainedHeader chainedHeader, BlockSpentTxesBuilder blockSpentTxes)
{
UnspentTx unspentTx;
if (!chainStateCursor.TryGetUnspentTx(input.PrevTxOutputKey.TxHash, out unspentTx))
{
// output wasn't present in utxo, invalid block
throw new ValidationException(chainedHeader.Hash);
}
var outputIndex = unchecked((int)input.PrevTxOutputKey.TxOutputIndex);
if (outputIndex < 0 || outputIndex >= unspentTx.OutputStates.Length)
{
// output was out of bounds
throw new ValidationException(chainedHeader.Hash);
}
if (unspentTx.OutputStates[outputIndex] == OutputState.Spent)
{
// output was already spent
throw new ValidationException(chainedHeader.Hash);
}
// update output states
unspentTx = unspentTx.SetOutputState(outputIndex, OutputState.Spent);
// decrement unspent output count
chainStateCursor.UnspentOutputCount--;
// update transaction output states in the utxo
var wasUpdated = chainStateCursor.TryUpdateUnspentTx(unspentTx);
if (!wasUpdated)
throw new ValidationException(chainedHeader.Hash);
// store pruning information for a fully spent transaction
if (unspentTx.IsFullySpent)
{
blockSpentTxes.AddSpentTx(unspentTx.ToSpentTx());
// decrement unspent tx count
chainStateCursor.UnspentTxCount--;
}
TxOutput txOutput;
if (!chainStateCursor.TryGetUnspentTxOutput(input.PrevTxOutputKey, out txOutput))
// output missing
throw new ValidationException(chainedHeader.Hash);
return new PrevTxOutput(txOutput, unspentTx);
}