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($"Error while submitting transactions to the node {submitException}");
responses.AddRange(unableToSubmit);
result.Txs = responses.ToArray();
result.FailureCount = result.Txs.Length; // all of the transactions have failed
return(result);
}
else // submitted without error
{
var(submitFailureCount, transformed) = TransformRpcResponse(rpcResponse,
transactionsToSubmit.Select(x => x.transactionId).ToArray());
responses.AddRange(transformed);
result.Txs = responses.ToArray();
result.FailureCount = failureCount + submitFailureCount;
var successfullTxs = transactionsToSubmit.Where(x => transformed.Any(y => y.ReturnResult == ResultCodes.Success && y.Txid == x.transactionId));
await txRepository.InsertTxsAsync(successfullTxs.Select(x => new Tx
{
CallbackToken = x.transaction.CallbackToken,
CallbackUrl = x.transaction.CallbackUrl,
CallbackEncryption = x.transaction.CallbackEncryption,
DSCheck = x.transaction.DsCheck,
MerkleProof = x.transaction.MerkleProof,
TxExternalId = new uint256(x.transactionId),
TxPayload = x.transaction.RawTx,
ReceivedAt = clock.UtcNow(),
TxIn = x.transaction.TransactionInputs
}).ToList());
return(result);
}
}
public async Task <SubmitTransactionsResponse> SubmitTransactionsAsync(IEnumerable <SubmitTransaction> requestEnum, UserAndIssuer user)
{
var request = requestEnum.ToArray();
logger.LogInformation($"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);
}
}