public async Task <FeeRate> GetFeeRateAsync(int blockTarget = 20)
{
try
{
return((await _ExplorerClient.GetFeeRateAsync(blockTarget).ConfigureAwait(false)).FeeRate);
}
catch (NBXplorerException ex) when(ex.Error.HttpCode == 400 && ex.Error.Code == "fee-estimation-unavailable")
{
return(_Factory.Fallback);
}
}
public async Task <FeeRate> GetFeeRateAsync()
{
if (!_ExplorerClient.Network.SupportEstimatesSmartFee)
{
return(_Factory.Fallback);
}
try
{
return((await _ExplorerClient.GetFeeRateAsync(_Factory.BlockTarget).ConfigureAwait(false)).FeeRate);
}
catch (NBXplorerException ex) when(ex.Error.HttpCode == 400 && ex.Error.Code == "fee-estimation-unavailable")
{
return(_Factory.Fallback);
}
}
private async Task ListenToSessionLoop(LongPollingNotificationSession session, CancellationToken stoppingToken)
{
var client = session.Client;
while (!stoppingToken.IsCancellationRequested)
{
try
{
var events =
(await session.GetEventsAsync(lastEventId, 10000, true, stoppingToken))
.Where(e => e.EventType == "newblock")
.Select(e => (NewBlockEvent)e)
.OrderBy(e => e.Height);
foreach (var e in events)
{
var newBlock = await client.RPCClient.GetBlockAsync(e.Hash).ConfigureAwait(false);
_peerManager.BlockNotifier.BlockConnected(newBlock, (uint)e.Height);
lastEventId = e.EventId > lastEventId ? e.EventId : lastEventId;
}
try
{
var h = await _explorerClient.GetFeeRateAsync(FeeRateSet.HighPriorityBlockCount, stoppingToken);
var n = await _explorerClient.GetFeeRateAsync(FeeRateSet.NormalBlockCount, stoppingToken);
var b = await _explorerClient.GetFeeRateAsync(FeeRateSet.BackgroundBlockCount, stoppingToken);
_feeRateWriter.TryWrite(new FeeRateSet()
{
HighPriority = h.FeeRate, Normal = n.FeeRate, Background = b.FeeRate
});
}
catch (NBXplorerException ex)
{
_logger.LogError($"Failed to estimate fee by nbxplorer: \"{ex.Message}\"");
}
// nbx does not return blocks aligned with eventId(i.e. sometimes block height will decrease when
// eventId increase. event if there are no forks. This is especially true in regtest, where many blocks
// are generated at once.)
// so to get the blocks in batch and to sort it by its height in our side, we will limit our query
// frequency by waiting in here.
await Task.Delay(6000, stoppingToken);
}
catch (HttpRequestException ex) when(ex.InnerException is TimeoutException)
{
}
catch (OperationCanceledException ex)
{
if (stoppingToken.IsCancellationRequested)
{
break;
}
}
catch (Exception ex)
{
_logger.LogError($"Failed to listen on nbx {ex}");
break;
}
}
_logger.LogInformation($"Shutting down nbx listener session loop...");
}
public async Task <string> WithdrawBtc(string withdrawHash, string recipient, decimal amount)
{
var coins = new List <UTXO>();
var coinsUsed = new List <UTXO>();
var estimatedFee = await client.GetFeeRateAsync(3);
try
{
await locker.WaitAsync();
while (coinsUsed.Sum(c => c.AsCoin().Amount.ToDecimal(MoneyUnit.BTC)) <= amount)
{
var txOperations = await client.GetUTXOsAsync(TrackedSource.Create(pubKey.GetAddress(ScriptPubKeyType.Legacy, Network.Main)));
foreach (var op in txOperations.Confirmed.UTXOs)
{
if (!usedInputs.ContainsKey(op.TransactionHash.ToString() + op.Value.Satoshi.ToString()))
{
coins.Add(op);
}
}
coins.Sort(delegate(UTXO x, UTXO y)
{
return(-x.AsCoin().Amount.CompareTo(y.AsCoin().Amount));
});
foreach (var item in coins)
{
if (coinsUsed.Sum(c => c.AsCoin().Amount.ToDecimal(MoneyUnit.BTC)) <= amount)
{
coinsUsed.Add(item);
usedInputs.Add(item.TransactionHash.ToString() + item.Value.Satoshi.ToString(), item);
}
else
{
break;
}
}
if (coinsUsed.Sum(c => c.AsCoin().Amount.ToDecimal(MoneyUnit.BTC)) < amount)
{
await Task.Delay(5000);
}
}
TransactionBuilder builder = null;
BitcoinPubKeyAddress destination = null;
if (network == NetworkType.Testnet)
{
builder = Network.TestNet.CreateTransactionBuilder();
destination = new BitcoinPubKeyAddress(recipient, Network.TestNet);
}
else
{
builder = Network.Main.CreateTransactionBuilder();
destination = new BitcoinPubKeyAddress(recipient, Network.Main);
}
NBitcoin.Transaction tx = builder
.AddCoins(coinsUsed.Select(c => c.AsCoin() /* .ScriptPubKey.ToBytes()*/))
.Send(destination, Money.Coins(amount))
.Send(TxNullDataTemplate.Instance.GenerateScriptPubKey(Encoding.UTF8.GetBytes(withdrawHash)), Money.Zero)
.SetChange(pubKey.GetAddress(ScriptPubKeyType.Legacy, Network.Main))
.SendEstimatedFees((await client.GetFeeRateAsync(3)).FeeRate)
.BuildTransaction(sign: false);
// Specify the path to unmanaged PKCS#11 library provided by the cryptographic device vendor
string pkcs11LibraryPath = @"/opt/cloudhsm/lib/libcloudhsm_pkcs11_standard.so";
// Create factories used by Pkcs11Interop library
Net.Pkcs11Interop.HighLevelAPI.Pkcs11InteropFactories factories = new Net.Pkcs11Interop.HighLevelAPI.Pkcs11InteropFactories();
// Load unmanaged PKCS#11 library
using (Net.Pkcs11Interop.HighLevelAPI.IPkcs11Library pkcs11Library = factories.Pkcs11LibraryFactory.LoadPkcs11Library(factories, pkcs11LibraryPath, AppType.MultiThreaded))
{
// Show general information about loaded library
Net.Pkcs11Interop.HighLevelAPI.ILibraryInfo libraryInfo = pkcs11Library.GetInfo();
Console.WriteLine("Library");
Console.WriteLine(" Manufacturer: " + libraryInfo.ManufacturerId);
Console.WriteLine(" Description: " + libraryInfo.LibraryDescription);
Console.WriteLine(" Version: " + libraryInfo.LibraryVersion);
// Get list of all available slots
foreach (Net.Pkcs11Interop.HighLevelAPI.ISlot slot in pkcs11Library.GetSlotList(SlotsType.WithOrWithoutTokenPresent))
{
// Show basic information about slot
Net.Pkcs11Interop.HighLevelAPI.ISlotInfo slotInfo = slot.GetSlotInfo();
Console.WriteLine();
Console.WriteLine("Slot");
Console.WriteLine(" Manufacturer: " + slotInfo.ManufacturerId);
Console.WriteLine(" Description: " + slotInfo.SlotDescription);
Console.WriteLine(" Token present: " + slotInfo.SlotFlags.TokenPresent);
if (slotInfo.SlotFlags.TokenPresent)
{
// Show basic information about token present in the slot
Net.Pkcs11Interop.HighLevelAPI.ITokenInfo tokenInfo = slot.GetTokenInfo();
Console.WriteLine("Token");
Console.WriteLine(" Manufacturer: " + tokenInfo.ManufacturerId);
Console.WriteLine(" Model: " + tokenInfo.Model);
Console.WriteLine(" Serial number: " + tokenInfo.SerialNumber);
Console.WriteLine(" Label: " + tokenInfo.Label);
// Show list of mechanisms (algorithms) supported by the token
Console.WriteLine("Supported mechanisms: ");
foreach (CKM mechanism in slot.GetMechanismList())
{
Console.WriteLine(" " + mechanism);
}
}
using (Net.Pkcs11Interop.HighLevelAPI.ISession session = slot.OpenSession(SessionType.ReadWrite))
{
session.Login(CKU.CKU_USER, pkcsUser);
// Specify signing mechanism
Net.Pkcs11Interop.HighLevelAPI.IMechanism mechanism = session.Factories.MechanismFactory.Create(CKM.CKM_ECDSA);
List <Net.Pkcs11Interop.HighLevelAPI.IObjectAttribute> publicKeyAttributes = new List <Net.Pkcs11Interop.HighLevelAPI.IObjectAttribute>();
publicKeyAttributes.Add(new Net.Pkcs11Interop.HighLevelAPI80.ObjectAttribute(CKA.CKA_LABEL, hsmKey));
publicKeyAttributes.Add(new Net.Pkcs11Interop.HighLevelAPI80.ObjectAttribute(CKA.CKA_SIGN, true));
Net.Pkcs11Interop.HighLevelAPI.IObjectHandle key = session.FindAllObjects(publicKeyAttributes).FirstOrDefault();
uint i = 0;
foreach (var c in tx.Inputs.AsIndexedInputs())
{
byte[] sourceData = c.GetSignatureHash(coinsUsed.First(cu => cu.Outpoint.Hash == c.PrevOut.Hash).AsCoin()).ToBytes();
Console.WriteLine("sourceData: " + tx.ToHex());
byte[] signature = session.Sign(mechanism, key, sourceData);
Console.WriteLine("signature: " + BitConverter.ToString(signature));
var canSig = ECDSASignatureFactory.FromComponents(signature).MakeCanonical();
var sig = new NBitcoin.TransactionSignature(new NBitcoin.Crypto.ECDSASignature(new NBitcoin.BouncyCastle.Math.BigInteger(canSig.R.ToByteArray()), new NBitcoin.BouncyCastle.Math.BigInteger(canSig.S.ToByteArray())), SigHash.Single);
builder = builder.AddKnownSignature(pubKey, sig, c.PrevOut);
TransactionSignature sig2 = null;
if (builder.TrySignInput(tx, i, SigHash.Single, out sig2))
{
Console.WriteLine("Input Signed");
Console.WriteLine(BitConverter.ToString(sig2.ToBytes()));
}
else
{
Console.WriteLine("Input Not Signed");
}
Console.WriteLine("tx: " + tx);
i++;
tx = builder.SignTransactionInPlace(tx);
}
Console.WriteLine("tx: " + tx);
TransactionPolicyError[] errors = null;
if (builder.Verify(tx, out errors))
{
var broadcastResult = await client.BroadcastAsync(tx);
broadcastResult.ToString();
Console.WriteLine("broadcast: " + tx.GetHash().ToString());
session.Logout();
return(tx.GetHash().ToString());
}
else
{
Console.WriteLine("Verify transaction failed");
}
if (errors != null)
{
foreach (var e in errors)
{
Console.WriteLine(e.ToString());
}
}
session.Logout();
}
}
}
return(null);
}
catch (Exception e)
{
Log.Error("Failed to send BTC Withdraw" + e.ToString());
throw e;
}
finally
{
locker.Release();
}
}