// ToDo: The finding of transaction in DB will probably has a better algorithm
// The following one by one version is the preliminary design
private async Task <Transaction> FindThePunishment(BalanceOperation op, MultisigOutputEntity output)
{
using (OffchainMonitorContext context = new OffchainMonitorContext())
{
var commitments = from c in context.Commitments
where c.CommitmentOutput.TransactionId == output.TransactionId &&
c.CommitmentOutput.OutputNumber == output.OutputNumber
select c;
if (commitments != null && commitments.Count() > 0)
{
foreach (var c in commitments)
{
if (TransactionsMatch(c, op))
{
return(new Transaction(c.Punishment));
}
}
}
else
{
// No commitment cosuming the specified output
return(null);
}
// No commitment found matching the specified transaction, spending multisig output
return(null);
}
}
public async Task CheckCommitmentBroadcastOld()
{
string multisig = null;
Network network = Network.TestNet;
try
{
multisig = await settingsRepository.Get <string>("multisig");
network = await Helper.GetNetwork(settingsRepository);
}
catch (Exception exp)
{
return;
}
var outputs = await qBitNinjaApiCaller.GetAddressBalance(multisig, true, true);
MultisigOutputEntity desiredOutput = null;
using (OffchainMonitorContext context = new OffchainMonitorContext())
{
desiredOutput = (from o in context.MultisigOutputs
orderby o.LastSeen ascending
select o).FirstOrDefault();
}
if (desiredOutput == null)
{
// There is no commitment
return;
}
else
{
foreach (var op in outputs.Operations)
{
var found = op.ReceivedCoins.Where(o => o.Outpoint.Hash.ToString() == desiredOutput.TransactionId && o.Outpoint.N == desiredOutput.OutputNumber).Any();
if (found)
{
// The output is still unspent which means no commitments is spent
return;
}
}
}
// The output has not been found, which means it has been spent by a commitment
outputs = await qBitNinjaApiCaller.GetAddressBalance(multisig, true, false);
foreach (var op in outputs.Operations)
{
bool found = op.SpentCoins.
Where(sc => sc.Outpoint.Hash.ToString() == desiredOutput.TransactionId && sc.Outpoint.N == desiredOutput.OutputNumber).Any();
if (found)
{
var respectivePunishment = await FindThePunishment(op, desiredOutput);
if (respectivePunishment != null)
{
await rpcBitcoinClient.BroadcastTransaction(respectivePunishment, new Guid());
}
else
{
// The punishment has not been found
}
}
}
}
public async Task <IActionResult> AddCommitmentPunishmentPairOldDesign([FromQuery] string commitment,
[FromQuery] string punishment)
{
if (string.IsNullOrEmpty(commitment) || string.IsNullOrEmpty(punishment))
{
return(BadRequest("Passed parameters should not be null or empty"));
}
else
{
Transaction cTx = new Transaction(commitment);
Transaction pTx = new Transaction(punishment);
try
{
using (OffchainMonitorContext context = new OffchainMonitorContext())
{
var newlyAddedCommitment = new CommitmentEntity
{
Commitment = commitment,
Punishment = punishment
};
bool found = false;
var multisig = await settingsRepository.Get <string>("multisig");
var netwok = await Helper.GetNetwork(settingsRepository);
for (int i = 0; i < cTx.Inputs.Count; i++)
{
var prevHash = cTx.Inputs[i].PrevOut.Hash.ToString();
var prevTx = await bitcoinTransactionService.GetTransaction(prevHash);
var prevOut = cTx.Inputs[i].PrevOut;
if (prevTx.Outputs[prevOut.N].ScriptPubKey.GetDestinationAddress(netwok).ToString()
== multisig)
{
found = true;
var existingMultisigOutput = (from o in context.MultisigOutputs
where o.TransactionId == prevOut.Hash.ToString() && o.OutputNumber == prevOut.N
select o).FirstOrDefault();
if (existingMultisigOutput == null)
{
var newMultisigOutput = new MultisigOutputEntity();
newMultisigOutput.TransactionId = prevOut.Hash.ToString();
newMultisigOutput.OutputNumber = (int)prevOut.N;
newMultisigOutput.LastSeen = DateTime.UtcNow;
await context.MultisigOutputs.AddAsync(newMultisigOutput);
existingMultisigOutput = newMultisigOutput;
}
existingMultisigOutput.LastSeen = DateTime.UtcNow;
existingMultisigOutput.Commitments.Add(newlyAddedCommitment);
newlyAddedCommitment.CommitmentOutput = existingMultisigOutput;
await context.Commitments.AddAsync(newlyAddedCommitment);
}
}
if (!found)
{
return(BadRequest(string.Format("The provide transaction does not pay to multisig:{0}", multisig)));
}
await context.SaveChangesAsync();
}
return(Ok());
}
catch (Exception exp)
{
throw exp;
}
}
}