public async Task RemovedFromMempoolEventAsync(RemovedFromMempoolEvent e)
{
if (e.Message.Reason == RemovedFromMempoolMessage.Reasons.CollisionInBlockTx)
{
var removedTxId = new uint256(e.Message.TxId).ToBytes();
var txWithDSCheck = (await txRepository.GetTxsForDSCheckAsync(new[] { removedTxId }, false)).ToArray();
if (txWithDSCheck.Any())
{
// Try to insert the block into DB. If block is already present in DB nothing will be done
await blockParser.NewBlockDiscoveredAsync(new NewBlockDiscoveredEvent()
{
CreationDate = clock.UtcNow(), BlockHash = e.Message.BlockHash
});
foreach (var tx in txWithDSCheck)
{
await txRepository.InsertBlockDoubleSpendAsync(
tx.TxInternalId,
new uint256(e.Message.BlockHash).ToBytes(),
new uint256(e.Message.CollidedWith.TxId).ToBytes(),
HelperTools.HexStringToByteArray(e.Message.CollidedWith.Hex));
var notificationEvent = new NewNotificationEvent()
{
CreationDate = clock.UtcNow(),
NotificationType = CallbackReason.DoubleSpend,
TransactionId = tx.TxExternalIdBytes
};
eventBus.Publish(notificationEvent);
}
}
}
}
public async Task <ActionResult> QueryAsync(string txId)
{
if (!uint256.TryParse(txId, out uint256 uTxId))
{
return(AddBanScoreAndReturnResult("Invalid 'txid' format.", txId));
}
var tx = (await txRepository.GetTxsForDSCheckAsync(new byte[][] { uTxId.ToBytes() }, true)).SingleOrDefault();
if (tx == null || !tx.DSCheck)
{
logger.LogDebug($"Setting not interested information for {txId}");
// Set response header that we are not interested in DS check
this.Response.Headers.Add(DSHeader, "0");
if (tx == null)
{
transactionRequestsCheck.LogUnknownTransactionRequest(Request.Host.Host);
}
else
{
transactionRequestsCheck.LogKnownTransactionId(Request.Host.Host, uTxId);
}
if (banList.IsHostBanned(Request.Host.Host))
{
return(BadRequest("Query for unknown transaction id requested too many times. (banned)"));
}
return(Ok());
}
logger.LogDebug($"Setting interested information for {txId}");
// Set response header that we are interested in DS check
this.Response.Headers.Add(DSHeader, "1");
transactionRequestsCheck.LogKnownTransactionId(Request.Host.Host, uTxId);
if (banList.IsHostBanned(Request.Host.Host))
{
return(BadRequest("Query for known transaction id requested too many times. (banned)"));
}
transactionRequestsCheck.LogQueriedTransactionId(Request.Host.Host, uTxId);
return(Ok());
}