public async Task CatchMempoolAndBlockDoubleSpendMessages()
{
var txs = await CatchInMempoolDoubleSpendZMQMessage();
var tx1 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txs.Item1));
var tx2 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txs.Item2));
var txId1 = tx1.GetHash().ToString();
var txId2 = tx2.GetHash().ToString();
await MineNextBlockAsync(new[] { tx2 });
var mempoolTxs2 = await rpcClient0.GetRawMempool();
// Tx should no longer be in mempool
Assert.IsFalse(mempoolTxs2.Contains(txId1), "Submitted tx1 should not be found in mempool");
WaitUntilEventBusIsIdle();
var calls = Callback.Calls;
Assert.AreEqual(2, calls.Length);
var callbackDS = HelperTools.JSONDeserialize <JSONEnvelopeViewModel>(calls[1].request)
.ExtractPayload <CallbackNotificationDoubleSpendViewModel>();
Assert.AreEqual(CallbackReason.DoubleSpend, callbackDS.CallbackReason);
Assert.AreEqual(new uint256(txId1), new uint256(callbackDS.CallbackTxId));
Assert.AreEqual(new uint256(txId2), new uint256(callbackDS.CallbackPayload.DoubleSpendTxId));
}
public async Task CatchDSOfMempoolAncestorTxByBlockTxAsync()
{
using CancellationTokenSource cts = new(cancellationTimeout);
await RegisterNodesWithServiceAndWaitAsync(cts.Token);
Assert.AreEqual(1, zmqService.GetActiveSubscriptions().Count());
// Create two transactions from same input
var coin = availableCoins.Dequeue();
var(txHex1, txId1) = CreateNewTransaction(coin, new Money(1000L));
var(txHex2, txId2) = CreateNewTransaction(coin, new Money(500L));
var tx2 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txHex2));
// Transactions should not be the same
Assert.AreNotEqual(txHex1, txHex2);
// Submit transaction
var response = await node0.RpcClient.SendRawTransactionAsync(HelperTools.HexStringToByteArray(txHex1), true, false, cts.Token);
// Create chain based on first transaction with last transaction being sent to mAPI
var(lastTxHex, lastTxId, mapiCount) = await CreateUnconfirmedAncestorChainAsync(txHex1, txId1, 100, 0, true, cts.Token);
var mempoolTxs = await rpcClient0.GetRawMempool();
// Transactions should be in mempool
Assert.IsTrue(mempoolTxs.Contains(txId1), "Submitted tx1 not found in mempool");
Assert.AreEqual(0, Callback.Calls.Length);
// Mine a new block containing tx2
await MineNextBlockAsync(new[] { tx2 });
var mempoolTxs2 = await rpcClient0.GetRawMempool();
// Tx should no longer be in mempool
Assert.IsFalse(mempoolTxs2.Contains(txId1), "Submitted tx1 should not be found in mempool");
WaitUntilEventBusIsIdle();
var calls = Callback.Calls;
Assert.AreEqual(1, calls.Length);
var callback = HelperTools.JSONDeserialize <JSONEnvelopeViewModel>(calls[0].request)
.ExtractPayload <CallbackNotificationDoubleSpendViewModel>();
Assert.AreEqual(CallbackReason.DoubleSpend, callback.CallbackReason);
Assert.AreEqual(new uint256(lastTxId), new uint256(callback.CallbackTxId));
Assert.AreEqual(new uint256(txId2), new uint256(callback.CallbackPayload.DoubleSpendTxId));
}
public static bool TryParseTransaction(byte[] transaction, out Transaction result)
{
try
{
result = HelperTools.ParseBytesToTransaction(transaction);
return(true);
}
catch (Exception)
{
result = null;
return(false);
}
}
public async Task CatchDoubleSpendOfMempoolTxByBlockTx()
{
// Create two transactions from same input
var coin = availableCoins.Dequeue();
var(txHex1, txId1) = CreateNewTransaction(coin, new Money(1000L));
var(txHex2, txId2) = CreateNewTransaction(coin, new Money(500L));
var tx2 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txHex2));
// Transactions should not be the same
Assert.AreNotEqual(txHex1, txHex2);
// Send first transaction using mAPI
var payload = await SubmitTransactionAsync(txHex1, true, true);
Assert.AreEqual("success", payload.ReturnResult);
var mempoolTxs = await rpcClient0.GetRawMempool();
// Transactions should be in mempool
Assert.IsTrue(mempoolTxs.Contains(txId1), "Submitted tx1 not found in mempool");
Assert.AreEqual(0, Callback.Calls.Length);
// Mine a new block containing tx2
await MineNextBlockAsync(new[] { tx2 });
var mempoolTxs2 = await rpcClient0.GetRawMempool();
// Tx should no longer be in mempool
Assert.IsFalse(mempoolTxs2.Contains(txId1), "Submitted tx1 should not be found in mempool");
WaitUntilEventBusIsIdle();
var calls = Callback.Calls;
Assert.AreEqual(1, calls.Length);
var callback = HelperTools.JSONDeserialize <JSONEnvelopeViewModel>(calls[0].request)
.ExtractPayload <CallbackNotificationDoubleSpendViewModel>();
Assert.AreEqual(CallbackReason.DoubleSpend, callback.CallbackReason);
Assert.AreEqual(new uint256(txId1), new uint256(callback.CallbackTxId));
Assert.AreEqual(new uint256(txId2), new uint256(callback.CallbackPayload.DoubleSpendTxId));
}
public Tx CreateNewTx(string txHash, string txHex, bool merkleProof, string merkleFormat, bool dsCheck)
{
var tx = new Tx
{
DSCheck = dsCheck,
MerkleProof = merkleProof,
MerkleFormat = merkleFormat,
ReceivedAt = MockedClock.UtcNow,
TxExternalId = new uint256(txHash),
TxPayload = HelperTools.HexStringToByteArray(txHex)
};
var transaction = HelperTools.ParseBytesToTransaction(tx.TxPayload);
tx.TxIn = transaction.Inputs.AsIndexedInputs().Select(x => new TxInput
{
N = x.Index,
PrevN = x.PrevOut.N,
PrevTxId = x.PrevOut.Hash.ToBytes()
}).ToList();
return(tx);
}
public async Task <SubmitTransactionsResponse> SubmitTransactionsAsync(IEnumerable <SubmitTransaction> requestEnum, UserAndIssuer user)
{
var request = requestEnum.ToArray();
logger.LogInformation($"Processing {request.Length} incoming transactions");
// Take snapshot of current metadata and use use it for all transactions
var info = blockChainInfo.GetInfo();
var currentMinerId = await minerId.GetCurrentMinerIdAsync();
var consolidationParameters = info.ConsolidationTxParameters;
// Use the same quotes for all transactions in single request
var quotes = feeQuoteRepository.GetValidFeeQuotesByIdentity(user).ToArray();
if (quotes == null || !quotes.Any())
{
throw new Exception("No fee quotes available");
}
var responses = new List <SubmitTransactionOneResponse>();
var transactionsToSubmit = new List <(string transactionId, SubmitTransaction transaction, bool allowhighfees, bool dontCheckFees)>();
int failureCount = 0;
IDictionary <uint256, byte[]> allTxs = new Dictionary <uint256, byte[]>();
foreach (var oneTx in request)
{
if ((oneTx.RawTx == null || oneTx.RawTx.Length == 0) && string.IsNullOrEmpty(oneTx.RawTxString))
{
AddFailureResponse(null, $"{nameof(SubmitTransaction.RawTx)} is required", ref responses);
failureCount++;
continue;
}
if (oneTx.RawTx == null)
{
try
{
oneTx.RawTx = HelperTools.HexStringToByteArray(oneTx.RawTxString);
}
catch (Exception ex)
{
AddFailureResponse(null, ex.Message, ref responses);
failureCount++;
continue;
}
}
uint256 txId = Hashes.DoubleSHA256(oneTx.RawTx);
string txIdString = txId.ToString();
if (allTxs.ContainsKey(txId))
{
AddFailureResponse(txIdString, "Transaction with this id occurs more than once within request", ref responses);
failureCount++;
continue;
}
var vc = new ValidationContext(oneTx);
var errors = oneTx.Validate(vc);
if (errors.Count() > 0)
{
AddFailureResponse(txIdString, string.Join(",", errors.Select(x => x.ErrorMessage)), ref responses);
failureCount++;
continue;
}
allTxs.Add(txId, oneTx.RawTx);
bool okToMine = false;
bool okToRelay = false;
if (await txRepository.TransactionExistsAsync(txId.ToBytes()))
{
AddFailureResponse(txIdString, "Transaction already known", ref responses);
failureCount++;
continue;
}
Transaction transaction = null;
CollidedWith[] colidedWith = {};
Exception exception = null;
string[] prevOutsErrors = { };
try
{
transaction = HelperTools.ParseBytesToTransaction(oneTx.RawTx);
if (transaction.IsCoinBase)
{
throw new ExceptionWithSafeErrorMessage("Invalid transaction - coinbase transactions are not accepted");
}
var(sumPrevOuputs, prevOuts) = await CollectPreviousOuputs(transaction, new ReadOnlyDictionary <uint256, byte[]>(allTxs), rpcMultiClient);
prevOutsErrors = prevOuts.Where(x => !string.IsNullOrEmpty(x.Error)).Select(x => x.Error).ToArray();
colidedWith = prevOuts.Where(x => x.CollidedWith != null).Select(x => x.CollidedWith).ToArray();
if (IsConsolidationTxn(transaction, consolidationParameters, prevOuts))
{
(okToMine, okToRelay) = (true, true);
}
else
{
foreach (var feeQuote in quotes)
{
var(okToMineTmp, okToRelayTmp) =
CheckFees(transaction, oneTx.RawTx.LongLength, sumPrevOuputs, feeQuote);
if (GetCheckFeesValue(okToMineTmp, okToRelayTmp) > GetCheckFeesValue(okToMine, okToRelay))
{
// save best combination
(okToMine, okToRelay) = (okToMineTmp, okToRelayTmp);
}
}
}
}
catch (Exception ex)
{
exception = ex;
}
if (exception != null || colidedWith.Any() || transaction == null || prevOutsErrors.Any())
{
var oneResponse = new SubmitTransactionOneResponse
{
Txid = txIdString,
ReturnResult = ResultCodes.Failure,
// Include non null ConflictedWith only if a collision has been detected
ConflictedWith = !colidedWith.Any() ? null : colidedWith.Select(
x => new SubmitTransactionConflictedTxResponse
{
Txid = x.TxId,
Size = x.Size,
Hex = x.Hex,
}).ToArray()
};
if (transaction is null)
{
oneResponse.ResultDescription = "Can not parse transaction";
}
else if (exception is ExceptionWithSafeErrorMessage)
{
oneResponse.ResultDescription = exception.Message;
}
else if (exception != null)
{
oneResponse.ResultDescription = "Error fetching inputs";
}
else // colidedWith !=null and there is no exception or prevOutsErrors is not empty
{
// return "Missing inputs" regardless of error returned from gettxouts (which is usually "missing")
oneResponse.ResultDescription = "Missing inputs";
}
logger.LogError($"Can not calculate fee for {txIdString}. Error: {oneResponse.ResultDescription} Exception: {exception?.ToString() ?? ""}");
responses.Add(oneResponse);
failureCount++;
continue;
}
// Transactions was successfully analyzed
if (!okToMine && !okToRelay)
{
AddFailureResponse(txIdString, "Not enough fees", ref responses);
failureCount++;
}
else
{
bool allowHighFees = false;
bool dontcheckfee = okToMine;
oneTx.TransactionInputs = transaction.Inputs.AsIndexedInputs().Select(x => new TxInput
{
N = x.Index,
PrevN = x.PrevOut.N,
PrevTxId = x.PrevOut.Hash.ToBytes()
}).ToList();
transactionsToSubmit.Add((txIdString, oneTx, allowHighFees, dontcheckfee));
}
}
RpcSendTransactions rpcResponse;
Exception submitException = null;
if (transactionsToSubmit.Any())
{
// Submit all collected transactions in one call
try
{
rpcResponse = await rpcMultiClient.SendRawTransactionsAsync(
transactionsToSubmit.Select(x => (x.transaction.RawTx, x.allowhighfees, x.dontCheckFees))
.ToArray());
}
catch (Exception ex)
{
submitException = ex;
rpcResponse = null;
}
}
else
{
// Simulate empty response
rpcResponse = new RpcSendTransactions();
}
// Initialize common fields
var result = new SubmitTransactionsResponse
{
Timestamp = clock.UtcNow(),
MinerId = currentMinerId,
CurrentHighestBlockHash = info.BestBlockHash,
CurrentHighestBlockHeight = info.BestBlockHeight,
// TxSecondMempoolExpiry
// Remaining of the fields are initialized bellow
};
if (submitException != null)
{
var unableToSubmit = transactionsToSubmit.Select(x =>
new SubmitTransactionOneResponse
{
Txid = x.transactionId,
ReturnResult = ResultCodes.Failure,
ResultDescription = "Error while submitting transactions to the node" // do not expose detailed error message. It might contain internal IPS etc
});
logger.LogError($"Error while submitting transactions to the node {submitException}");
responses.AddRange(unableToSubmit);
result.Txs = responses.ToArray();
result.FailureCount = result.Txs.Length; // all of the transactions have failed
return(result);
}
else // submitted without error
{
var(submitFailureCount, transformed) = TransformRpcResponse(rpcResponse,
transactionsToSubmit.Select(x => x.transactionId).ToArray());
responses.AddRange(transformed);
result.Txs = responses.ToArray();
result.FailureCount = failureCount + submitFailureCount;
var successfullTxs = transactionsToSubmit.Where(x => transformed.Any(y => y.ReturnResult == ResultCodes.Success && y.Txid == x.transactionId));
await txRepository.InsertTxsAsync(successfullTxs.Select(x => new Tx
{
CallbackToken = x.transaction.CallbackToken,
CallbackUrl = x.transaction.CallbackUrl,
CallbackEncryption = x.transaction.CallbackEncryption,
DSCheck = x.transaction.DsCheck,
MerkleProof = x.transaction.MerkleProof,
TxExternalId = new uint256(x.transactionId),
TxPayload = x.transaction.RawTx,
ReceivedAt = clock.UtcNow(),
TxIn = x.transaction.TransactionInputs
}).ToList());
return(result);
}
}
public async Task <ActionResult> SubmitDSAsync([FromQuery] string txId, [FromQuery] int?n, [FromQuery] string cTxId, [FromQuery] int?cn)
{
logger.LogInformation($"SubmitDSAsync call received for txid:'{txId}', n:'{n}', cTxId:'{cTxId}', cn:'{cn}'");
// Set response header here that we are interested in DS submit again in case of any error
this.Response.Headers.Add(DSHeader, "1");
if (string.IsNullOrEmpty(txId))
{
return(AddBanScoreAndReturnResult("'txid' must not be null or empty.", ""));
}
if (string.IsNullOrEmpty(cTxId))
{
return(AddBanScoreAndReturnResult("'ctxid' must not be null or empty.", txId));
}
if (!uint256.TryParse(txId, out uint256 uTxId))
{
return(AddBanScoreAndReturnResult("Invalid 'txid' format.", txId));
}
if (!uint256.TryParse(cTxId, out uint256 ucTxId))
{
return(AddBanScoreAndReturnResult("Invalid 'ctxid' format.", txId));
}
if (txId == cTxId)
{
return(AddBanScoreAndReturnResult("'ctxid' parameter must not be the same as 'txid'.", txId, HostBanList.WarningScore));
}
if (n == null || n < 0)
{
return(AddBanScoreAndReturnResult("'n' must be equal or greater than 0.", txId, HostBanList.WarningScore));
}
if (cn == null || cn < 0)
{
return(AddBanScoreAndReturnResult("'cn' must be equal or greater than 0.", txId, HostBanList.WarningScore));
}
if (!transactionRequestsCheck.WasTransactionIdQueried(Request.Host.Host, uTxId))
{
return(AddBanScoreAndReturnResult("Submitted transactionId was not queried before making a call to submit, or it was already submitted.", txId));
}
var tx = (await txRepository.GetTxsForDSCheckAsync(new byte[][] { uTxId.ToBytes() }, true)).SingleOrDefault();
if (tx == null)
{
return(AddBanScoreAndReturnResult($"There is no transaction waiting for double-spend notification with given transaction id '{txId}'.", txId, HostBanList.WarningScore));
}
if (n > tx.OrderderInputs.Length)
{
return(AddBanScoreAndReturnResult($"'n' parameter must not be greater than total number of inputs.", txId, HostBanList.WarningScore));
}
transactionRequestsCheck.LogKnownTransactionId(Request.Host.Host, uTxId);
byte[] dsTxBytes;
using (var ms = new MemoryStream())
{
await Request.Body.CopyToAsync(ms);
dsTxBytes = ms.ToArray();
}
if (dsTxBytes.Length == 0)
{
return(AddBanScoreAndReturnResult("Proof must not be empty.", txId));
}
if (Hashes.DoubleSHA256(dsTxBytes) != ucTxId)
{
return(AddBanScoreAndReturnResult("Double-spend transaction does not match the 'ctxid' parameter.", txId));
}
Transaction dsTx;
try
{
dsTx = HelperTools.ParseBytesToTransaction(dsTxBytes);
}
catch (Exception)
{
return(AddBanScoreAndReturnResult("'dsProof' is invalid.", txId));
}
if (cn > dsTx.Inputs.Count)
{
return(AddBanScoreAndReturnResult($"'cn' parameter must not be greater than total number of inputs.", txId));
}
var dsTxIn = dsTx.Inputs[cn.Value];
var txIn = tx.OrderderInputs[n.Value];
if (!(new uint256(txIn.PrevTxId) == dsTxIn.PrevOut.Hash &&
txIn.PrevN == dsTxIn.PrevOut.N))
{
return(AddBanScoreAndReturnResult("Transaction marked as double-spend does not spend same inputs as original transaction.", txId));
}
logger.LogInformation($"Double spend checks completed successfully for '{txId}' and '{cTxId}'. Verifying script.");
var scripts = new List <(string Tx, int N)>()
{
(dsTx.ToHex(), cn.Value)
}.AsEnumerable();
// We take single result, because we will be sending only 1 tx at a time
var verified = (await rpcMultiClient.VerifyScriptAsync(true, appSettings.DSScriptValidationTimeoutSec, scripts)).Single();
if (verified.Result != "ok")
{
return(AddBanScoreAndReturnResult($"Invalid proof script. Reason: '{verified.Description}'.", cTxId));
}
logger.LogInformation($"Successfully verified script for transaction '{cTxId}'. Inserting notification data into database");
transactionRequestsCheck.RemoveQueriedTransactionId(Request.Host.Host, uTxId);
var inserted = await txRepository.InsertMempoolDoubleSpendAsync(
tx.TxInternalId,
dsTx.GetHash(Const.NBitcoinMaxArraySize).ToBytes(),
dsTxBytes);
if (inserted > 0)
{
var notificationData = new NotificationData
{
TxExternalId = uTxId.ToBytes(),
DoubleSpendTxId = ucTxId.ToBytes(),
CallbackEncryption = tx.CallbackEncryption,
CallbackToken = tx.CallbackToken,
CallbackUrl = tx.CallbackUrl,
TxInternalId = tx.TxInternalId,
BlockHeight = -1,
BlockInternalId = -1,
BlockHash = null
};
eventBus.Publish(new Domain.Models.Events.NewNotificationEvent
{
CreationDate = clock.UtcNow(),
NotificationData = notificationData,
NotificationType = CallbackReason.DoubleSpendAttempt,
TransactionId = uTxId.ToBytes()
});
logger.LogInformation($"Inserted notification push data into database for '{txId}'.");
}
// Submit was successfull we set the x-bsv-dsnt to 0, to signal the node we are not interested in this DS anymore
this.Response.Headers[DSHeader] = "0";
return(Ok());
}
public async Task CatchDoubleSpendOfBlockTxByBlockTx()
{
// Create two transactions from same input
var coin = availableCoins.Dequeue();
var(txHex1, _) = CreateNewTransaction(coin, new Money(1000L));
var(txHex2, txId2) = CreateNewTransaction(coin, new Money(500L));
var tx1 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txHex1));
var tx2 = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txHex2));
// Transactions should not be the same
Assert.AreNotEqual(txHex1, txHex2);
var parentBlockHash = await rpcClient0.GetBestBlockHashAsync();
var parentBlockHeight = (await rpcClient0.GetBlockHeaderAsync(parentBlockHash)).Height;
// Send first transaction using mAPI - we want to get DS notification for it
var payload = await SubmitTransactionAsync(txHex1, true, true);
Assert.AreEqual(payload.ReturnResult, "success");
// Mine a new block containing tx1
var b1Hash = (await rpcClient0.GenerateAsync(1)).Single();
loggerTest.LogInformation($"Block b1 {b1Hash} was mined containing tx1 {tx1.GetHash()}");
WaitUntilEventBusIsIdle();
var calls = Callback.Calls;
Assert.AreEqual(1, calls.Length);
var signedJSON = HelperTools.JSONDeserialize <SignedPayloadViewModel>(calls[0].request);
var notification = HelperTools.JSONDeserialize <CallbackNotificationViewModelBase>(signedJSON.Payload);
Assert.AreEqual(CallbackReason.MerkleProof, notification.CallbackReason);
// Mine sibling block to b1 - without any additional transaction
var(b2, _) = await MineNextBlockAsync(Array.Empty <Transaction>(), false, parentBlockHash);
loggerTest.LogInformation($"Block b2 {b2.Header.GetHash()} was mined with only coinbase transaction");
// Mine a child block to b2, containing tx2. This will create a longer chain and we should be notified about doubleSpend
var(b3, _) = await MineNextBlockAsync(new [] { tx2 }, true, b2, parentBlockHeight + 2);
loggerTest.LogInformation($"Block b3 {b3.Header.GetHash()} was mined with a ds transaction tx2 {tx2.GetHash()}");
// Check if b3 was accepted
var currentBestBlock = await rpcClient0.GetBestBlockHashAsync();
Assert.AreEqual(b3.GetHash().ToString(), currentBestBlock, "b3 was not activated");
WaitUntilEventBusIsIdle();
calls = Callback.Calls;
Assert.AreEqual(2, calls.Length);
signedJSON = HelperTools.JSONDeserialize <SignedPayloadViewModel>(calls[1].request);
var dsNotification = HelperTools.JSONDeserialize <CallbackNotificationDoubleSpendViewModel>(signedJSON.Payload);
Assert.AreEqual(CallbackReason.DoubleSpend, dsNotification.CallbackReason);
Assert.AreEqual(txId2, dsNotification.CallbackPayload.DoubleSpendTxId);
}
public async Task <SubmitTransactionsResponse> SubmitTransactionsAsync(IEnumerable <SubmitTransaction> requestEnum, UserAndIssuer user)
{
var request = requestEnum.ToArray();
logger.LogInformation($"Processing {request.Length} incoming transactions");
// Take snapshot of current metadata and use use it for all transactions
var info = await blockChainInfo.GetInfoAsync();
var currentMinerId = await minerId.GetCurrentMinerIdAsync();
var consolidationParameters = info.ConsolidationTxParameters;
// Use the same quotes for all transactions in single request
var quotes = feeQuoteRepository.GetValidFeeQuotesByIdentity(user).ToArray();
if (quotes == null || !quotes.Any())
{
throw new Exception("No fee quotes available");
}
var responses = new List <SubmitTransactionOneResponse>();
var transactionsToSubmit = new List <(string transactionId, SubmitTransaction transaction, bool allowhighfees, bool dontCheckFees, bool listUnconfirmedAncestors, Dictionary <string, object> config)>();
int failureCount = 0;
IDictionary <uint256, byte[]> allTxs = new Dictionary <uint256, byte[]>();
foreach (var oneTx in request)
{
if (!string.IsNullOrEmpty(oneTx.MerkleFormat) && !MerkleFormat.ValidFormats.Any(x => x == oneTx.MerkleFormat))
{
AddFailureResponse(null, $"Invalid merkle format {oneTx.MerkleFormat}. Supported formats: {String.Join(",", MerkleFormat.ValidFormats)}.", ref responses);
failureCount++;
continue;
}
if ((oneTx.RawTx == null || oneTx.RawTx.Length == 0) && string.IsNullOrEmpty(oneTx.RawTxString))
{
AddFailureResponse(null, $"{nameof(SubmitTransaction.RawTx)} is required", ref responses);
failureCount++;
continue;
}
if (oneTx.RawTx == null)
{
try
{
oneTx.RawTx = HelperTools.HexStringToByteArray(oneTx.RawTxString);
}
catch (Exception ex)
{
AddFailureResponse(null, ex.Message, ref responses);
failureCount++;
continue;
}
}
uint256 txId = Hashes.DoubleSHA256(oneTx.RawTx);
string txIdString = txId.ToString();
logger.LogInformation($"Processing transaction: { txIdString }");
if (oneTx.MerkleProof && (appSettings.DontParseBlocks.Value || appSettings.DontInsertTransactions.Value))
{
AddFailureResponse(txIdString, $"Transaction requires merkle proof notification but this instance of mAPI does not support callbacks", ref responses);
failureCount++;
continue;
}
if (oneTx.DsCheck && (appSettings.DontParseBlocks.Value || appSettings.DontInsertTransactions.Value))
{
AddFailureResponse(txIdString, $"Transaction requires double spend notification but this instance of mAPI does not support callbacks", ref responses);
failureCount++;
continue;
}
if (allTxs.ContainsKey(txId))
{
AddFailureResponse(txIdString, "Transaction with this id occurs more than once within request", ref responses);
failureCount++;
continue;
}
var vc = new ValidationContext(oneTx);
var errors = oneTx.Validate(vc);
if (errors.Any())
{
AddFailureResponse(txIdString, string.Join(",", errors.Select(x => x.ErrorMessage)), ref responses);
failureCount++;
continue;
}
allTxs.Add(txId, oneTx.RawTx);
bool okToMine = false;
bool okToRelay = false;
Dictionary <string, object> policies = null;
if (await txRepository.TransactionExistsAsync(txId.ToBytes()))
{
AddFailureResponse(txIdString, "Transaction already known", ref responses);
failureCount++;
continue;
}
Transaction transaction = null;
CollidedWith[] colidedWith = Array.Empty <CollidedWith>();
Exception exception = null;
string[] prevOutsErrors = Array.Empty <string>();
try
{
transaction = HelperTools.ParseBytesToTransaction(oneTx.RawTx);
if (transaction.IsCoinBase)
{
throw new ExceptionWithSafeErrorMessage("Invalid transaction - coinbase transactions are not accepted");
}
var(sumPrevOuputs, prevOuts) = await CollectPreviousOuputs(transaction, new ReadOnlyDictionary <uint256, byte[]>(allTxs), rpcMultiClient);
prevOutsErrors = prevOuts.Where(x => !string.IsNullOrEmpty(x.Error)).Select(x => x.Error).ToArray();
colidedWith = prevOuts.Where(x => x.CollidedWith != null).Select(x => x.CollidedWith).ToArray();
logger.LogInformation($"CollectPreviousOuputs for {txIdString} returned { prevOuts.Length } prevOuts ({prevOutsErrors.Length } prevOutsErrors, {colidedWith.Length} colidedWith).");
if (appSettings.CheckFeeDisabled.Value || IsConsolidationTxn(transaction, consolidationParameters, prevOuts))
{
logger.LogInformation($"{txIdString}: appSettings.CheckFeeDisabled { appSettings.CheckFeeDisabled }");
(okToMine, okToRelay) = (true, true);
}
else
{
logger.LogInformation($"Starting with CheckFees calculation for {txIdString} and { quotes.Length} quotes.");
foreach (var feeQuote in quotes)
{
var(okToMineTmp, okToRelayTmp) =
CheckFees(transaction, oneTx.RawTx.LongLength, sumPrevOuputs, feeQuote);
if (GetCheckFeesValue(okToMineTmp, okToRelayTmp) > GetCheckFeesValue(okToMine, okToRelay))
{
// save best combination
(okToMine, okToRelay, policies) = (okToMineTmp, okToRelayTmp, feeQuote.PoliciesDict);
}
}
logger.LogInformation($"Finished with CheckFees calculation for {txIdString} and { quotes.Length} quotes: { (okToMine, okToRelay, policies == null ? "" : string.Join(";", policies.Select(x => x.Key + "=" + x.Value)) )}.");
}
}
catch (Exception ex)
{
exception = ex;
}
if (exception != null || colidedWith.Any() || transaction == null || prevOutsErrors.Any())
{
var oneResponse = new SubmitTransactionOneResponse
{
Txid = txIdString,
ReturnResult = ResultCodes.Failure,
// Include non null ConflictedWith only if a collision has been detected
ConflictedWith = !colidedWith.Any() ? null : colidedWith.Select(
x => new SubmitTransactionConflictedTxResponse
{
Txid = x.TxId,
Size = x.Size,
Hex = x.Hex,
}).ToArray()
};
if (transaction is null)
{
oneResponse.ResultDescription = "Can not parse transaction";
}
else if (exception is ExceptionWithSafeErrorMessage)
{
oneResponse.ResultDescription = exception.Message;
}
else if (exception != null)
{
oneResponse.ResultDescription = "Error fetching inputs";
}
else if (oneResponse.ConflictedWith != null && oneResponse.ConflictedWith.Any(c => c.Txid == oneResponse.Txid))
{
oneResponse.ResultDescription = "Transaction already in the mempool";
oneResponse.ConflictedWith = null;
}
else
{
// return "Missing inputs" regardless of error returned from gettxouts (which is usually "missing")
oneResponse.ResultDescription = "Missing inputs";
}
logger.LogError($"Can not calculate fee for {txIdString}. Error: {oneResponse.ResultDescription} Exception: {exception?.ToString() ?? ""}");
responses.Add(oneResponse);
failureCount++;
continue;
}
// Transactions was successfully analyzed
if (!okToMine && !okToRelay)
{
AddFailureResponse(txIdString, "Not enough fees", ref responses);
failureCount++;
}
else
{
bool allowHighFees = false;
bool dontcheckfee = okToMine;
bool listUnconfirmedAncestors = false;
oneTx.TransactionInputs = transaction.Inputs.AsIndexedInputs().Select(x => new TxInput
{
N = x.Index,
PrevN = x.PrevOut.N,
PrevTxId = x.PrevOut.Hash.ToBytes()
}).ToList();
if (oneTx.DsCheck)
{
foreach (TxInput txInput in oneTx.TransactionInputs)
{
var prevOut = await txRepository.GetPrevOutAsync(txInput.PrevTxId, txInput.PrevN);
if (prevOut == null)
{
listUnconfirmedAncestors = true;
break;
}
}
}
transactionsToSubmit.Add((txIdString, oneTx, allowHighFees, dontcheckfee, listUnconfirmedAncestors, policies));
}
}
logger.LogInformation($"TransactionsToSubmit: { transactionsToSubmit.Count }: { string.Join("; ", transactionsToSubmit.Select(x => x.transactionId))} ");
RpcSendTransactions rpcResponse;
Exception submitException = null;
if (transactionsToSubmit.Any())
{
// Submit all collected transactions in one call
try
{
rpcResponse = await rpcMultiClient.SendRawTransactionsAsync(
transactionsToSubmit.Select(x => (x.transaction.RawTx, x.allowhighfees, x.dontCheckFees, x.listUnconfirmedAncestors, x.config))
.ToArray());
}
catch (Exception ex)
{
submitException = ex;
rpcResponse = null;
}
}
else
{
// Simulate empty response
rpcResponse = new RpcSendTransactions();
}
// Initialize common fields
var result = new SubmitTransactionsResponse
{
Timestamp = clock.UtcNow(),
MinerId = currentMinerId,
CurrentHighestBlockHash = info.BestBlockHash,
CurrentHighestBlockHeight = info.BestBlockHeight,
// TxSecondMempoolExpiry
// Remaining of the fields are initialized bellow
};
if (submitException != null)
{
var unableToSubmit = transactionsToSubmit.Select(x =>
new SubmitTransactionOneResponse
{
Txid = x.transactionId,
ReturnResult = ResultCodes.Failure,
ResultDescription = "Error while submitting transactions to the node" // do not expose detailed error message. It might contain internal IPS etc
});
logger.LogError($"Error while submitting transactions to the node {submitException}");
responses.AddRange(unableToSubmit);
result.Txs = responses.ToArray();
result.FailureCount = result.Txs.Length; // all of the transactions have failed
return(result);
}
else // submitted without error
{
var(submitFailureCount, transformed) = TransformRpcResponse(rpcResponse,
transactionsToSubmit.Select(x => x.transactionId).ToArray());
responses.AddRange(transformed);
result.Txs = responses.ToArray();
result.FailureCount = failureCount + submitFailureCount;
if (!appSettings.DontInsertTransactions.Value)
{
var successfullTxs = transactionsToSubmit.Where(x => transformed.Any(y => y.ReturnResult == ResultCodes.Success && y.Txid == x.transactionId));
logger.LogInformation($"Starting with InsertTxsAsync: { successfullTxs.Count() }: { string.Join("; ", successfullTxs.Select(x => x.transactionId))} (TransactionsToSubmit: { transactionsToSubmit.Count })");
var watch = System.Diagnostics.Stopwatch.StartNew();
await txRepository.InsertTxsAsync(successfullTxs.Select(x => new Tx
{
CallbackToken = x.transaction.CallbackToken,
CallbackUrl = x.transaction.CallbackUrl,
CallbackEncryption = x.transaction.CallbackEncryption,
DSCheck = x.transaction.DsCheck,
MerkleProof = x.transaction.MerkleProof,
MerkleFormat = x.transaction.MerkleFormat,
TxExternalId = new uint256(x.transactionId),
TxPayload = x.transaction.RawTx,
ReceivedAt = clock.UtcNow(),
TxIn = x.transaction.TransactionInputs
}).ToList(), false);
long unconfirmedAncestorsCount = 0;
if (rpcResponse.Unconfirmed != null)
{
List <Tx> unconfirmedAncestors = new();
foreach (var unconfirmed in rpcResponse.Unconfirmed)
{
unconfirmedAncestors.AddRange(unconfirmed.Ancestors.Select(u => new Tx
{
TxExternalId = new uint256(u.Txid),
ReceivedAt = clock.UtcNow(),
TxIn = u.Vin.Select(i => new TxInput()
{
PrevTxId = (new uint256(i.Txid)).ToBytes(),
PrevN = i.Vout
}).ToList()
})
);
}
await txRepository.InsertTxsAsync(unconfirmedAncestors, true);
unconfirmedAncestorsCount = unconfirmedAncestors.Count;
}
watch.Stop();
logger.LogInformation($"Finished with InsertTxsAsync: { successfullTxs.Count() } found unconfirmedAncestors { unconfirmedAncestorsCount } took {watch.ElapsedMilliseconds} ms.");
}
return(result);
}
}
public async Task CatchDSOfBlockAncestorTxByBlockTxAsync()
{
using CancellationTokenSource cts = new(cancellationTimeout);
await RegisterNodesWithServiceAndWaitAsync(cts.Token);
Assert.AreEqual(1, zmqService.GetActiveSubscriptions().Count());
// Create two transactions from same input
var coin = availableCoins.Dequeue();
var(txHex1, txId1) = CreateNewTransaction(coin, new Money(1000L));
var(txHexDS, txIdDS) = CreateNewTransaction(coin, new Money(500L));
// Subscribe invalidtx events
var invalidTxDetectedSubscription = EventBus.Subscribe <InvalidTxDetectedEvent>();
// Submit transactions
var response = await node0.RpcClient.SendRawTransactionAsync(HelperTools.HexStringToByteArray(txHex1), true, false, cts.Token);
// Create chain based on first transaction
var(lastTxHex, lastTxId, mapiCount) = await CreateUnconfirmedAncestorChainAsync(txHex1, txId1, 100, 0, true, cts.Token);
var parentBlockHash = await rpcClient0.GetBestBlockHashAsync();
var parentBlockHeight = (await rpcClient0.GetBlockHeaderAsync(parentBlockHash)).Height;
// Mine a new block containing mAPI transaction and its whole unconfirmed ancestor chain
var b1Hash = (await rpcClient0.GenerateAsync(1)).Single();
WaitUntilEventBusIsIdle();
var calls = Callback.Calls;
Assert.AreEqual(1, calls.Length);
var signedJSON = HelperTools.JSONDeserialize <SignedPayloadViewModel>(calls[0].request);
var notification = HelperTools.JSONDeserialize <CallbackNotificationViewModelBase>(signedJSON.Payload);
Assert.AreEqual(CallbackReason.MerkleProof, notification.CallbackReason);
// Mine sibling block to b1 - without any additional transaction
var(b2, _) = await MineNextBlockAsync(Array.Empty <Transaction>(), false, parentBlockHash);
// Mine a child block to b2, containing txDS. This will create a longer chain and we should be notified about doubleSpend
var txDS = HelperTools.ParseBytesToTransaction(HelperTools.HexStringToByteArray(txHexDS));
var(b3, _) = await MineNextBlockAsync(new[] { txDS }, true, b2, parentBlockHeight + 2);
// Check if b3 was accepted
var currentBestBlock = await rpcClient0.GetBestBlockHashAsync();
Assert.AreEqual(b3.GetHash().ToString(), currentBestBlock, "b3 was not activated");
WaitUntilEventBusIsIdle();
calls = Callback.Calls;
Assert.AreEqual(2, calls.Length);
signedJSON = HelperTools.JSONDeserialize <SignedPayloadViewModel>(calls[1].request);
var dsNotification = HelperTools.JSONDeserialize <CallbackNotificationDoubleSpendViewModel>(signedJSON.Payload);
Assert.AreEqual(CallbackReason.DoubleSpend, dsNotification.CallbackReason);
Assert.AreEqual(txIdDS, dsNotification.CallbackPayload.DoubleSpendTxId);
}