public static Transaction GetTransactionFromExportCookie(byte[] cookie)
{
ArgumentNullException.ThrowIfNull(cookie);
if (cookie.Length < 32)
{
throw new ArgumentException(SR.InvalidArgument, nameof(cookie));
}
TransactionsEtwProvider etwLog = TransactionsEtwProvider.Log;
if (etwLog.IsEnabled())
{
etwLog.MethodEnter(TraceSourceType.TraceSourceOleTx, "TransactionInterop.GetTransactionFromExportCookie");
}
var cookieCopy = new byte[cookie.Length];
Buffer.BlockCopy(cookie, 0, cookieCopy, 0, cookie.Length);
cookie = cookieCopy;
// Extract the transaction guid from the propagation token to see if we already have a
// transaction object for the transaction.
// In a cookie, the transaction guid is preceded by a signature guid.
var txId = new Guid(cookie.AsSpan(16, 16));
// First check to see if there is a promoted LTM transaction with the same ID. If there
// is, just return that.
Transaction?transaction = TransactionManager.FindPromotedTransaction(txId);
if (transaction != null)
{
if (etwLog.IsEnabled())
{
etwLog.MethodExit(TraceSourceType.TraceSourceOleTx, "TransactionInterop.GetTransactionFromExportCookie");
}
return(transaction);
}
// Find or create the promoted transaction.
OletxTransaction dTx = OletxTransactionManager.GetTransactionFromExportCookie(cookieCopy, txId);
transaction = TransactionManager.FindOrCreatePromotedTransaction(txId, dTx);
if (etwLog.IsEnabled())
{
etwLog.MethodExit(TraceSourceType.TraceSourceOleTx, "TransactionInterop.GetTransactionFromExportCookie");
}
return(transaction);
}
