private async Task UpdateUTXO(UpdatePSBTRequest update, Repository repo, BitcoinDWaiter rpc)
{
AnnotatedTransactionCollection txs = null;
// First, we check for data in our history
foreach (var input in update.PSBT.Inputs.Where(NeedUTXO))
{
txs = txs ?? await GetAnnotatedTransactions(repo, ChainProvider.GetChain(repo.Network), new DerivationSchemeTrackedSource(update.DerivationScheme));
if (txs.GetByTxId(input.PrevOut.Hash) is AnnotatedTransaction tx)
{
if (!tx.Record.Key.IsPruned)
{
input.NonWitnessUtxo = tx.Record.Transaction;
}
else
{
input.WitnessUtxo = tx.Record.ReceivedCoins.FirstOrDefault(c => c.Outpoint.N == input.Index)?.TxOut;
}
}
}
// then, we search data in the saved transactions
await Task.WhenAll(update.PSBT.Inputs
.Where(NeedUTXO)
.Select(async(input) =>
{
// If this is not segwit, or we are unsure of it, let's try to grab from our saved transactions
if (input.NonWitnessUtxo == null)
{
var prev = await repo.GetSavedTransactions(input.PrevOut.Hash);
if (prev.FirstOrDefault() is Repository.SavedTransaction saved)
{
input.NonWitnessUtxo = saved.Transaction;
}
}
}).ToArray());
// finally, we check with rpc's txindex
if (rpc?.RPCAvailable is true && rpc?.HasTxIndex is true)
{
var batch = rpc.RPC.PrepareBatch();
var getTransactions = Task.WhenAll(update.PSBT.Inputs
.Where(NeedUTXO)
.Where(input => input.NonWitnessUtxo == null)
.Select(async input =>
{
var tx = await batch.GetRawTransactionAsync(input.PrevOut.Hash, false);
if (tx != null)
{
input.NonWitnessUtxo = tx;
}
}).ToArray());
await batch.SendBatchAsync();
await getTransactions;
}
}
private void FillUTXOsInformation(List <UTXO> utxos, AnnotatedTransactionCollection transactions, int currentHeight)
{
for (int i = 0; i < utxos.Count; i++)
{
var utxo = utxos[i];
utxo.KeyPath = transactions.GetKeyPath(utxo.ScriptPubKey);
utxo.Feature = DerivationStrategyBase.GetFeature(utxo.KeyPath);
var txHeight = transactions.GetByTxId(utxo.Outpoint.Hash)
.Select(t => t.Height)
.Where(h => h.HasValue)
.Select(t => t.Value)
.Concat(MaxValue)
.Min();
var firstSeen = transactions
.GetByTxId(utxo.Outpoint.Hash)
.Select(o => o.Record.FirstSeen)
.FirstOrDefault();
var isUnconf = txHeight == MaxValue[0];
utxo.Confirmations = isUnconf ? 0 : currentHeight - txHeight + 1;
utxo.Timestamp = firstSeen;
}
}
private void FillUTXOsInformation(List <UTXO> utxos, Func <Script[], KeyPath[]> getKeyPaths, AnnotatedTransactionCollection transactionsById, int currentHeight)
{
var keyPaths = getKeyPaths(utxos.Select(u => u.Output.ScriptPubKey).ToArray());
for (int i = 0; i < utxos.Count; i++)
{
var utxo = utxos[i];
utxo.KeyPath = keyPaths[i];
var txHeight = transactionsById.GetByTxId(utxo.Outpoint.Hash).Select(r => r.Height).Min();
txHeight = txHeight == MempoolHeight ? currentHeight + 1 : txHeight;
utxo.Confirmations = currentHeight - txHeight + 1;
}
}