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[3.1.6] | Fix | Invalid transaction exception against the connections and distributed transactions (#2301) #2434

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May 8, 2024
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[3.1.6] | Fix | Invalid transaction exception against the connections and distributed transactions (#2301) #2434

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12 changes: 9 additions & 3 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/ProviderBase/DbConnectionInternal.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ internal abstract partial class DbConnectionInternal
{
private static int _objectTypeCount;
internal readonly int _objectID = Interlocked.Increment(ref _objectTypeCount);
private TransactionCompletedEventHandler _transactionCompletedEventHandler = null;

private bool _isInStasis;

Expand Down Expand Up @@ -437,15 +438,19 @@ internal void DetachTransaction(Transaction transaction, bool isExplicitlyReleas
// potentially a multi-threaded event, so lock the connection to make sure we don't enlist in a new
// transaction between compare and assignment. No need to short circuit outside of lock, since failed comparisons should
// be the exception, not the rule.
lock (this)
// locking on anything other than the transaction object would lead to a thread deadlock with sys.Transaction.TransactionCompleted event.
lock (transaction)
{
// Detach if detach-on-end behavior, or if outer connection was closed
DbConnection owner = (DbConnection)Owner;
if (isExplicitlyReleasing || UnbindOnTransactionCompletion || null == owner)
if (isExplicitlyReleasing || UnbindOnTransactionCompletion || owner is null)
{
Transaction currentEnlistedTransaction = _enlistedTransaction;
if (currentEnlistedTransaction != null && transaction.Equals(currentEnlistedTransaction))
{
// We need to remove the transaction completed event handler to cease listening for the transaction to end.
currentEnlistedTransaction.TransactionCompleted -= _transactionCompletedEventHandler;

EnlistedTransaction = null;

if (IsTxRootWaitingForTxEnd)
Expand Down Expand Up @@ -479,7 +484,8 @@ void TransactionCompletedEvent(object sender, TransactionEventArgs e)

private void TransactionOutcomeEnlist(Transaction transaction)
{
transaction.TransactionCompleted += new TransactionCompletedEventHandler(TransactionCompletedEvent);
_transactionCompletedEventHandler ??= new TransactionCompletedEventHandler(TransactionCompletedEvent);
transaction.TransactionCompleted += _transactionCompletedEventHandler;
}

internal void SetInStasis()
Expand Down
6 changes: 3 additions & 3 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SqlDelegatedTransaction.cs
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Expand Up @@ -155,17 +155,17 @@ public byte[] Promote()
ValidateActiveOnConnection(connection);

connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Promote, null, System.Data.IsolationLevel.Unspecified, _internalTransaction, true);
returnValue = _connection.PromotedDTCToken;
returnValue = connection.PromotedDTCToken;

// For Global Transactions, we need to set the Transaction Id since we use a Non-MSDTC Promoter type.
if (_connection.IsGlobalTransaction)
if (connection.IsGlobalTransaction)
{
if (SysTxForGlobalTransactions.SetDistributedTransactionIdentifier == null)
{
throw SQL.UnsupportedSysTxForGlobalTransactions();
}

if (!_connection.IsGlobalTransactionsEnabledForServer)
if (!connection.IsGlobalTransactionsEnabledForServer)
{
throw SQL.GlobalTransactionsNotEnabled();
}
Expand Down
15 changes: 9 additions & 6 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/ProviderBase/DbConnectionInternal.cs
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Expand Up @@ -18,11 +18,10 @@ namespace Microsoft.Data.ProviderBase
using SysTx = System.Transactions;

internal abstract class DbConnectionInternal
{ // V1.1.3300


{
private static int _objectTypeCount;
internal readonly int _objectID = Interlocked.Increment(ref _objectTypeCount);
private SysTx.TransactionCompletedEventHandler _transactionCompletedEventHandler = null;

internal static readonly StateChangeEventArgs StateChangeClosed = new StateChangeEventArgs(ConnectionState.Open, ConnectionState.Closed);
internal static readonly StateChangeEventArgs StateChangeOpen = new StateChangeEventArgs(ConnectionState.Closed, ConnectionState.Open);
Expand Down Expand Up @@ -899,15 +898,18 @@ internal void DetachTransaction(SysTx.Transaction transaction, bool isExplicitly
// potentially a multi-threaded event, so lock the connection to make sure we don't enlist in a new
// transaction between compare and assignment. No need to short circuit outside of lock, since failed comparisons should
// be the exception, not the rule.
lock (this)
// locking on anything other than the transaction object would lead to a thread deadlock with sys.Transaction.TransactionCompleted event.
lock (transaction)
{
// Detach if detach-on-end behavior, or if outer connection was closed
DbConnection owner = (DbConnection)Owner;
if (isExplicitlyReleasing || UnbindOnTransactionCompletion || null == owner)
if (isExplicitlyReleasing || UnbindOnTransactionCompletion || owner is null)
{
SysTx.Transaction currentEnlistedTransaction = _enlistedTransaction;
if (currentEnlistedTransaction != null && transaction.Equals(currentEnlistedTransaction))
{
// We need to remove the transaction completed event handler to cease listening for the transaction to end.
currentEnlistedTransaction.TransactionCompleted -= _transactionCompletedEventHandler;

EnlistedTransaction = null;

Expand Down Expand Up @@ -946,7 +948,8 @@ void TransactionCompletedEvent(object sender, SysTx.TransactionEventArgs e)
[SecurityPermission(SecurityAction.Assert, Flags = SecurityPermissionFlag.UnmanagedCode)]
private void TransactionOutcomeEnlist(SysTx.Transaction transaction)
{
transaction.TransactionCompleted += new SysTx.TransactionCompletedEventHandler(TransactionCompletedEvent);
_transactionCompletedEventHandler ??= new SysTx.TransactionCompletedEventHandler(TransactionCompletedEvent);
transaction.TransactionCompleted += _transactionCompletedEventHandler;
}

internal void SetInStasis()
Expand Down
6 changes: 3 additions & 3 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/SqlDelegatedTransaction.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -192,17 +192,17 @@ public Byte[] Promote()
ValidateActiveOnConnection(connection);

connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Promote, null, IsolationLevel.Unspecified, _internalTransaction, true);
returnValue = _connection.PromotedDTCToken;
returnValue = connection.PromotedDTCToken;

// For Global Transactions, we need to set the Transaction Id since we use a Non-MSDTC Promoter type.
if (_connection.IsGlobalTransaction)
if (connection.IsGlobalTransaction)
{
if (SysTxForGlobalTransactions.SetDistributedTransactionIdentifier == null)
{
throw SQL.UnsupportedSysTxForGlobalTransactions();
}

if (!_connection.IsGlobalTransactionsEnabledForServer)
if (!connection.IsGlobalTransactionsEnabledForServer)
{
throw SQL.GlobalTransactionsNotEnabled();
}
Expand Down
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