private async Task TryRegisterCoinsAsync(CcjClientRound inputRegistrableRound)
{
try
{
List <(uint256 txid, uint index)> registrableCoins = State.GetRegistrableCoins(
inputRegistrableRound.State.MaximumInputCountPerPeer,
inputRegistrableRound.State.Denomination,
inputRegistrableRound.State.FeePerInputs,
inputRegistrableRound.State.FeePerOutputs).ToList();
if (registrableCoins.Any())
{
BitcoinAddress changeAddress = null;
BitcoinAddress activeAddress = null;
lock (CustomChangeAddressesLock)
{
if (CustomChangeAddresses.Count > 0)
{
changeAddress = CustomChangeAddresses.First();
CustomChangeAddresses.RemoveFirst();
}
}
lock (CustomActiveAddressesLock)
{
if (CustomActiveAddresses.Count > 0)
{
activeAddress = CustomActiveAddresses.First();
CustomActiveAddresses.RemoveFirst();
}
}
if (changeAddress is null || activeAddress is null)
{
IEnumerable <HdPubKey> allUnusedInternalKeys = KeyManager.GetKeys(keyState: null, isInternal: true).Where(x => x.KeyState != KeyState.Used);
if (changeAddress is null)
{
string changeLabel = "ZeroLink Change";
IEnumerable <HdPubKey> allChangeKeys = allUnusedInternalKeys.Where(x => x.Label == changeLabel);
HdPubKey changeKey = null;
KeyManager.AssertLockedInternalKeysIndexed(14);
IEnumerable <HdPubKey> internalNotCachedLockedKeys = KeyManager.GetKeys(KeyState.Locked, isInternal: true).Except(AccessCache.Keys);
if (allChangeKeys.Count() >= 7 || !internalNotCachedLockedKeys.Any()) // Then don't generate new keys, because it'd bloat the wallet.
{
// Find the first one that we did not try to register in the current session.
changeKey = allChangeKeys.FirstOrDefault(x => !AccessCache.ContainsKey(x));
// If there is no such a key, then use the oldest.
if (changeKey == default)
{
changeKey = AccessCache.Where(x => allChangeKeys.Contains(x.Key)).OrderBy(x => x.Value).First().Key;
}
changeKey.SetLabel(changeLabel);
changeKey.SetKeyState(KeyState.Locked);
}
else
{
changeKey = internalNotCachedLockedKeys.RandomElement();
changeKey.SetLabel(changeLabel);
}
changeAddress = changeKey.GetP2wpkhAddress(Network);
AccessCache.AddOrReplace(changeKey, DateTimeOffset.UtcNow);
}
if (activeAddress is null)
{
string activeLabel = "ZeroLink Mixed Coin";
IEnumerable <HdPubKey> allActiveKeys = allUnusedInternalKeys.Where(x => x.Label == activeLabel);
HdPubKey activeKey = null;
KeyManager.AssertLockedInternalKeysIndexed(14);
IEnumerable <HdPubKey> internalNotCachedLockedKeys = KeyManager.GetKeys(KeyState.Locked, isInternal: true).Except(AccessCache.Keys);
if (allActiveKeys.Count() >= 7 || !internalNotCachedLockedKeys.Any()) // Then don't generate new keys, because it'd bloat the wallet.
{
// Find the first one that we did not try to register in the current session.
activeKey = allActiveKeys.FirstOrDefault(x => !AccessCache.ContainsKey(x));
// If there is no such a key, then use the oldest.
if (activeKey == default)
{
activeKey = AccessCache.Where(x => allActiveKeys.Contains(x.Key)).OrderBy(x => x.Value).First().Key;
}
activeKey.SetLabel(activeLabel);
activeKey.SetKeyState(KeyState.Locked);
activeAddress = activeKey.GetP2wpkhAddress(Network);
}
else
{
activeKey = internalNotCachedLockedKeys.RandomElement();
activeKey.SetLabel(activeLabel);
}
activeAddress = activeKey.GetP2wpkhAddress(Network);
AccessCache.AddOrReplace(activeKey, DateTimeOffset.UtcNow);
}
}
KeyManager.ToFile();
var blind = CoordinatorPubKey.Blind(activeAddress.ScriptPubKey.ToBytes());
var inputProofs = new List <InputProofModel>();
foreach ((uint256 txid, uint index)coinReference in registrableCoins)
{
SmartCoin coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
coin.Secret = coin.Secret ?? KeyManager.GetSecrets(OnePiece, coin.ScriptPubKey).Single();
var inputProof = new InputProofModel
{
Input = coin.GetTxoRef(),
Proof = coin.Secret.PrivateKey.SignMessage(ByteHelpers.ToHex(blind.BlindedData))
};
inputProofs.Add(inputProof);
}
AliceClient aliceClient = await AliceClient.CreateNewAsync(Network, changeAddress, blind.BlindedData, inputProofs, CcjHostUri, TorSocks5EndPoint);
byte[] unblindedSignature = CoordinatorPubKey.UnblindSignature(aliceClient.BlindedOutputSignature, blind.BlindingFactor);
if (!CoordinatorPubKey.Verify(unblindedSignature, activeAddress.ScriptPubKey.ToBytes()))
{
throw new NotSupportedException("Coordinator did not sign the blinded output properly.");
}
CcjClientRound roundRegistered = State.GetSingleOrDefaultRound(aliceClient.RoundId);
if (roundRegistered is null)
{
// If our SatoshiClient doesn't yet know about the round because of the dealy create it.
// Make its state as it'd be the same as our assumed round was, except the roundId and registeredPeerCount, it'll be updated later.
roundRegistered = new CcjClientRound(CcjRunningRoundState.CloneExcept(inputRegistrableRound.State, aliceClient.RoundId, registeredPeerCount: 1));
State.AddOrReplaceRound(roundRegistered);
}
foreach ((uint256 txid, uint index)coinReference in registrableCoins)
{
var coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
roundRegistered.CoinsRegistered.Add(coin);
State.RemoveCoinFromWaitingList(coin);
}
roundRegistered.ActiveOutputAddress = activeAddress;
roundRegistered.ChangeOutputAddress = changeAddress;
roundRegistered.UnblindedSignature = unblindedSignature;
roundRegistered.AliceClient = aliceClient;
}
}
catch (Exception ex)
{
Logger.LogError <CcjClient>(ex);
}
}
private async Task TryRegisterCoinsAsync(CcjClientRound inputRegistrableRound)
{
try
{
// Select the most suitable coins to regiter.
List <TxoRef> registrableCoins = State.GetRegistrableCoins(
inputRegistrableRound.State.MaximumInputCountPerPeer,
inputRegistrableRound.State.Denomination,
inputRegistrableRound.State.FeePerInputs,
inputRegistrableRound.State.FeePerOutputs).ToList();
// If there are no suitable coins to register return.
if (!registrableCoins.Any())
{
return;
}
(HdPubKey change, IEnumerable <HdPubKey> actives)outputAddresses = GetOutputsToRegister(inputRegistrableRound.State.Denomination, inputRegistrableRound.State.SchnorrPubKeys.Count(), registrableCoins);
SchnorrPubKey[] schnorrPubKeys = inputRegistrableRound.State.SchnorrPubKeys.ToArray();
List <Requester> requesters = new List <Requester>();
var blindedOutputScriptHashes = new List <uint256>();
var registeredAddresses = new List <BitcoinAddress>();
for (int i = 0; i < schnorrPubKeys.Length; i++)
{
if (outputAddresses.actives.Count() <= i)
{
break;
}
BitcoinAddress address = outputAddresses.actives.Select(x => x.GetP2wpkhAddress(Network)).ElementAt(i);
SchnorrPubKey schnorrPubKey = schnorrPubKeys[i];
var outputScriptHash = new uint256(Hashes.SHA256(address.ScriptPubKey.ToBytes()));
var requester = new Requester();
uint256 blindedOutputScriptHash = requester.BlindMessage(outputScriptHash, schnorrPubKey);
requesters.Add(requester);
blindedOutputScriptHashes.Add(blindedOutputScriptHash);
registeredAddresses.Add(address);
}
byte[] blindedOutputScriptHashesByte = ByteHelpers.Combine(blindedOutputScriptHashes.Select(x => x.ToBytes()));
uint256 blindedOutputScriptsHash = new uint256(Hashes.SHA256(blindedOutputScriptHashesByte));
var inputProofs = new List <InputProofModel>();
foreach (TxoRef coinReference in registrableCoins)
{
SmartCoin coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
coin.Secret = coin.Secret ?? KeyManager.GetSecrets(SaltSoup(), coin.ScriptPubKey).Single();
var inputProof = new InputProofModel {
Input = coin.GetTxoRef(),
Proof = coin.Secret.PrivateKey.SignCompact(blindedOutputScriptsHash)
};
inputProofs.Add(inputProof);
}
AliceClient aliceClient = null;
try
{
aliceClient = await AliceClient.CreateNewAsync(inputRegistrableRound.RoundId, registeredAddresses, schnorrPubKeys, requesters, Network, outputAddresses.change.GetP2wpkhAddress(Network), blindedOutputScriptHashes, inputProofs, CcjHostUriAction, TorSocks5EndPoint);
}
catch (HttpRequestException ex) when(ex.Message.Contains("Input is banned", StringComparison.InvariantCultureIgnoreCase))
{
string[] parts = ex.Message.Split(new[] { "Input is banned from participation for ", " minutes: " }, StringSplitOptions.RemoveEmptyEntries);
string minutesString = parts[1];
int minuteInt = int.Parse(minutesString);
string bannedInputString = parts[2].TrimEnd('.');
string[] bannedInputStringParts = bannedInputString.Split(':', StringSplitOptions.RemoveEmptyEntries);
TxoRef coinReference = new TxoRef(new uint256(bannedInputStringParts[1]), uint.Parse(bannedInputStringParts[0]));
SmartCoin coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
coin.BannedUntilUtc = DateTimeOffset.UtcNow + TimeSpan.FromMinutes(minuteInt);
Logger.LogWarning <CcjClient>(ex.Message.Split('\n')[1]);
await DequeueCoinsFromMixNoLockAsync(coinReference, "Failed to register the coin with the coordinator.");
aliceClient?.Dispose();
return;
}
catch (HttpRequestException ex) when(ex.Message.Contains("Provided input is not unspent", StringComparison.InvariantCultureIgnoreCase))
{
string[] parts = ex.Message.Split(new[] { "Provided input is not unspent: " }, StringSplitOptions.RemoveEmptyEntries);
string spentInputString = parts[1].TrimEnd('.');
string[] bannedInputStringParts = spentInputString.Split(':', StringSplitOptions.RemoveEmptyEntries);
TxoRef coinReference = new TxoRef(new uint256(bannedInputStringParts[1]), uint.Parse(bannedInputStringParts[0]));
SmartCoin coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
coin.SpentAccordingToBackend = true;
Logger.LogWarning <CcjClient>(ex.Message.Split('\n')[1]);
await DequeueCoinsFromMixNoLockAsync(coinReference, "Failed to register the coin with the coordinator. The coin is already spent.");
aliceClient?.Dispose();
return;
}
catch (HttpRequestException ex) when(ex.Message.Contains("No such running round in InputRegistration.", StringComparison.InvariantCultureIgnoreCase))
{
Logger.LogInfo <CcjClient>("Client tried to register a round that is not in InputRegistration anymore. Trying again later.");
aliceClient?.Dispose();
return;
}
catch (HttpRequestException ex) when(ex.Message.Contains("too-long-mempool-chain", StringComparison.InvariantCultureIgnoreCase))
{
Logger.LogInfo <CcjClient>("Coordinator failed because too much unconfirmed parent transactions. Trying again later.");
aliceClient?.Dispose();
return;
}
var coinsRegistered = new List <SmartCoin>();
foreach (TxoRef coinReference in registrableCoins)
{
var coin = State.GetSingleOrDefaultFromWaitingList(coinReference);
if (coin is null)
{
throw new NotSupportedException("This is impossible.");
}
coinsRegistered.Add(coin);
State.RemoveCoinFromWaitingList(coin);
}
var registration = new ClientRoundRegistration(aliceClient, coinsRegistered, outputAddresses.change.GetP2wpkhAddress(Network));
CcjClientRound roundRegistered = State.GetSingleOrDefaultRound(aliceClient.RoundId);
if (roundRegistered is null)
{
// If our SatoshiClient does not yet know about the round, because of delay, then delay the round registration.
DelayedRoundRegistration?.Dispose();
DelayedRoundRegistration = registration;
}
roundRegistered.Registration = registration;
}
catch (Exception ex)
{
Logger.LogError <CcjClient>(ex);
}
}