Skip to content
This repository has been archived by the owner on Jan 23, 2023. It is now read-only.
/ corefx Public archive

SqlClient managed networking improvements #35363

Merged
merged 10 commits into from
Jun 4, 2019
Merged

SqlClient managed networking improvements #35363

Show file tree
Hide file tree
Changes from 4 commits
Commits
Show all changes
10 commits
Select commit Hold shift + click to select a range
492fe7b
rework SNIPacket and usage
Wraith2 Feb 15, 2019
c5af364
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Feb 27, 2019
7ac7d91
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Mar 13, 2019
77daffc
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Mar 19, 2019
5bfb5be
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Mar 21, 2019
5aea9de
address feedback
Wraith2 Mar 26, 2019
b88847b
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Mar 26, 2019
d0ee912
remove debug ifdef
Wraith2 Mar 27, 2019
019f135
Merge remote-tracking branch 'dotnet/master' into sqlperf-managedsmux
Wraith2 Mar 30, 2019
d64696b
address feedback
Wraith2 Mar 30, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 2 additions & 0 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNIHandle.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,8 @@ internal abstract class SNIHandle
/// </summary>
public abstract Guid ConnectionId { get; }

public virtual bool SMUXEnabled => false;
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Do we want to make it public?

Copy link
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It isn't publc, it's a public method on an internal class so it's effectively private to external view. it is however part of the public surface inside the assembly.


#if DEBUG
/// <summary>
/// Test handle for killing underlying connection
Expand Down
13 changes: 6 additions & 7 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNIMarsConnection.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,11 @@ public uint SendAsync(SNIPacket packet, SNIAsyncCallback callback)
/// <returns>SNI error code</returns>
public uint ReceiveAsync(ref SNIPacket packet)
{
if (packet != null)
{
packet.Release();
packet = null;
}
lock (this)
{
return _lowerHandle.ReceiveAsync(ref packet);
Expand Down Expand Up @@ -133,7 +138,7 @@ public void HandleReceiveError(SNIPacket packet)
{
handle.HandleReceiveError(packet);
}
packet?.Dispose();
packet?.Release();
}

/// <summary>
Expand Down Expand Up @@ -183,8 +188,6 @@ public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)

if (bytesTaken == 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);

if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
Expand Down Expand Up @@ -214,8 +217,6 @@ public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)

if (_dataBytesLeft > 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);

if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
Expand Down Expand Up @@ -271,8 +272,6 @@ public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
{
if (packet.DataLeft == 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);

if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
Expand Down
83 changes: 28 additions & 55 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNIMarsHandle.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ namespace System.Data.SqlClient.SNI
/// <summary>
/// MARS handle
/// </summary>
internal class SNIMarsHandle : SNIHandle
internal sealed class SNIMarsHandle : SNIHandle
{
private const uint ACK_THRESHOLD = 2;

Expand All @@ -33,27 +33,11 @@ internal class SNIMarsHandle : SNIHandle
private uint _sequenceNumber;
private SNIError _connectionError;

/// <summary>
/// Connection ID
/// </summary>
public override Guid ConnectionId
{
get
{
return _connectionId;
}
}
public override Guid ConnectionId => _connectionId;

/// <summary>
/// Handle status
/// </summary>
public override uint Status
{
get
{
return _status;
}
}
public override uint Status => _status;

public override bool SMUXEnabled => true;

/// <summary>
/// Dispose object
Expand Down Expand Up @@ -93,48 +77,39 @@ public SNIMarsHandle(SNIMarsConnection connection, ushort sessionId, object call
/// <param name="flags">SMUX header flags</param>
private void SendControlPacket(SNISMUXFlags flags)
{
Span<byte> headerBytes = stackalloc byte[SNISMUXHeader.HEADER_LENGTH];
SNIPacket packet = new SNIPacket(0,reserveMuxHeader:true);
lock (this)
{
GetSMUXHeaderBytes(0, flags, headerBytes);
SetupSMUXHeader(0, flags);
packet.SetHeader(_currentHeader);
}

SNIPacket packet = new SNIPacket(SNISMUXHeader.HEADER_LENGTH);
packet.AppendData(headerBytes);

_connection.Send(packet);
}

private void GetSMUXHeaderBytes(int length, SNISMUXFlags flags, Span<byte> bytes)
private void SetupSMUXHeader(int length, SNISMUXFlags flags)
{
Debug.Assert(Monitor.IsEntered(this), "must take lock on self before updating mux header");
_currentHeader.SMID = 83;
_currentHeader.flags = (byte)flags;
_currentHeader.sessionId = _sessionId;
_currentHeader.length = (uint)SNISMUXHeader.HEADER_LENGTH + (uint)length;
_currentHeader.sequenceNumber = ((flags == SNISMUXFlags.SMUX_FIN) || (flags == SNISMUXFlags.SMUX_ACK)) ? _sequenceNumber - 1 : _sequenceNumber++;
_currentHeader.highwater = _receiveHighwater;
_receiveHighwaterLastAck = _currentHeader.highwater;

_currentHeader.Write(bytes);
}

/// <summary>
/// Generate a packet with SMUX header
/// </summary>
/// <param name="packet">SNI packet</param>
/// <returns>Encapsulated SNI packet</returns>
private SNIPacket GetSMUXEncapsulatedPacket(SNIPacket packet)
/// <returns>The packet with the SMUx header set.</returns>
private SNIPacket SetPacketSMUXHeader(SNIPacket packet)
{
uint xSequenceNumber = _sequenceNumber;
Span<byte> header = stackalloc byte[SNISMUXHeader.HEADER_LENGTH];
GetSMUXHeaderBytes(packet.Length, SNISMUXFlags.SMUX_DATA, header);
Debug.Assert(packet.MuxHeaderReserved, "attempting to mux packet without mux reservation");


SNIPacket smuxPacket = new SNIPacket(SNISMUXHeader.HEADER_LENGTH + packet.Length);
smuxPacket.AppendData(header);
smuxPacket.AppendPacket(packet);
packet.Dispose();
return smuxPacket;
SetupSMUXHeader(packet.Length, SNISMUXFlags.SMUX_DATA);
packet.SetHeader(_currentHeader);
return packet;
}

/// <summary>
Expand All @@ -144,6 +119,8 @@ private SNIPacket GetSMUXEncapsulatedPacket(SNIPacket packet)
/// <returns>SNI error code</returns>
public override uint Send(SNIPacket packet)
{
Debug.Assert(packet.MuxHeaderReserved, "attempting to send muxed packet without mux reservation in Send");

while (true)
{
lock (this)
Expand All @@ -161,9 +138,13 @@ public override uint Send(SNIPacket packet)
_ackEvent.Reset();
}
}
SNIPacket encapsulatedPacket = GetSMUXEncapsulatedPacket(packet);

return _connection.Send(encapsulatedPacket);
SNIPacket muxedPacket = null;
lock (this)
{
muxedPacket = SetPacketSMUXHeader(packet);
}
return _connection.Send(muxedPacket);
}

/// <summary>
Expand All @@ -174,25 +155,17 @@ public override uint Send(SNIPacket packet)
/// <returns>SNI error code</returns>
private uint InternalSendAsync(SNIPacket packet, SNIAsyncCallback callback)
{
Debug.Assert(packet.MuxHeaderReserved, "attempting to send muxed packet without mux reservation in InternalSendAsync");
lock (this)
{
if (_sequenceNumber >= _sendHighwater)
{
return TdsEnums.SNI_QUEUE_FULL;
}

SNIPacket encapsulatedPacket = GetSMUXEncapsulatedPacket(packet);

if (callback != null)
{
encapsulatedPacket.SetCompletionCallback(callback);
}
else
{
encapsulatedPacket.SetCompletionCallback(HandleSendComplete);
}

return _connection.SendAsync(encapsulatedPacket, callback);
SNIPacket muxedPacket = SetPacketSMUXHeader(packet);
muxedPacket.SetCompletionCallback(callback??HandleSendComplete);
return _connection.SendAsync(muxedPacket, callback);
}
}

Expand Down
2 changes: 1 addition & 1 deletion src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNINpHandle.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ namespace System.Data.SqlClient.SNI
/// <summary>
/// Named Pipe connection handle
/// </summary>
internal class SNINpHandle : SNIHandle
internal sealed class SNINpHandle : SNIHandle
{
internal const string DefaultPipePath = @"sql\query"; // e.g. \\HOSTNAME\pipe\sql\query
private const int MAX_PIPE_INSTANCES = 255;
Expand Down
8 changes: 4 additions & 4 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNIPacket.NetCoreApp.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ async Task ReadFromStreamAsync(SNIPacket packet, SNIAsyncCallback cb, ValueTask<
cb(packet, error ? TdsEnums.SNI_ERROR : TdsEnums.SNI_SUCCESS);
}

ValueTask<int> vt = stream.ReadAsync(new Memory<byte>(_data, 0, _capacity), CancellationToken.None);
ValueTask<int> vt = stream.ReadAsync(new Memory<byte>(_data, _header, _capacity), CancellationToken.None);

if (vt.IsCompletedSuccessfully)
{
Expand Down Expand Up @@ -88,11 +88,11 @@ async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProvider

if (disposeAfter)
{
packet.Dispose();
packet.Release();
}
}

ValueTask vt = stream.WriteAsync(new Memory<byte>(_data, 0, _length), CancellationToken.None);
ValueTask vt = stream.WriteAsync(new Memory<byte>(_data, _header, _length), CancellationToken.None);

if (vt.IsCompletedSuccessfully)
{
Expand All @@ -103,7 +103,7 @@ async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProvider

if (disposeAfterWriteAsync)
{
Dispose();
Release();
}

// Completed
Expand Down
8 changes: 4 additions & 4 deletions src/System.Data.SqlClient/src/System/Data/SqlClient/SNI/SNIPacket.NetStandard.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ async Task ReadFromStreamAsync(SNIPacket packet, SNIAsyncCallback cb, Task<int>
cb(packet, error ? TdsEnums.SNI_ERROR : TdsEnums.SNI_SUCCESS);
}

Task<int> t = stream.ReadAsync(_data, 0, _capacity, CancellationToken.None);
Task<int> t = stream.ReadAsync(_data, _header, _capacity, CancellationToken.None);

if ((t.Status & TaskStatus.RanToCompletion) != 0)
{
Expand Down Expand Up @@ -88,11 +88,11 @@ async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProvider

if (disposeAfter)
{
packet.Dispose();
packet.Release();
}
}

Task t = stream.WriteAsync(_data, 0, _length, CancellationToken.None);
Task t = stream.WriteAsync(_data, _header, _length, CancellationToken.None);

if ((t.Status & TaskStatus.RanToCompletion) != 0)
{
Expand All @@ -103,7 +103,7 @@ async Task WriteToStreamAsync(SNIPacket packet, SNIAsyncCallback cb, SNIProvider

if (disposeAfterWriteAsync)
{
Dispose();
Release();
}

// Completed
Expand Down
Loading