/// <summary>
/// Handle receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="header">SMUX header</param>
public void HandleReceiveComplete(SNIPacket packet, SNISMUXHeader header)
{
lock (this)
{
if (_sendHighwater != header.highwater)
{
HandleAck(header.highwater);
}
lock (_receivedPacketQueue)
{
if (_asyncReceives == 0)
{
_receivedPacketQueue.Enqueue(packet);
_packetEvent.Set();
return;
}
_asyncReceives--;
Debug.Assert(_callbackObject != null);
((TdsParserStateObject)_callbackObject).ReadAsyncCallback(PacketHandle.FromManagedPacket(packet), 0);
}
}
lock (this)
{
_receiveHighwater++;
}
SendAckIfNecessary();
}
public SNISMUXHeader Clone()
{
SNISMUXHeader copy = new SNISMUXHeader();
copy.SMID = SMID;
copy.Flags = Flags;
copy.SessionId = SessionId;
copy.Length = Length;
copy.SequenceNumber = SequenceNumber;
copy.Highwater = Highwater;
return(copy);
}
/// <summary>
/// Generate a packet with SMUX header
/// </summary>
/// <param name="packet">SNI packet</param>
/// <returns>The packet with the SMUx header set.</returns>
private SNIPacket SetPacketSMUXHeader(SNIPacket packet)
{
Debug.Assert(packet.ReservedHeaderSize == SNISMUXHeader.HEADER_LENGTH, "mars handle attempting to smux packet without smux reservation");
Debug.Assert(Monitor.IsEntered(this), "cannot create mux header outside lock");
SNISMUXHeader header = SetupSMUXHeader(packet.DataLength, SNISMUXFlags.SMUX_DATA);
header.Write(packet.GetHeaderBuffer(SNISMUXHeader.HEADER_LENGTH));
packet.SetHeaderActive();
#if DEBUG
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, Setting SMUX_DATA header in current header for packet {1}", args0: ConnectionId, args1: packet?._id);
#endif
return(packet);
}
/// <summary>
/// Handle receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="header">SMUX header</param>
public void HandleReceiveComplete(SNIPacket packet, SNISMUXHeader header)
{
long scopeID = SqlClientEventSource.Log.TrySNIScopeEnterEvent(s_className);
try
{
lock (this)
{
if (_sendHighwater != header.highwater)
{
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, header.highwater {1}, _sendHighwater {2}, Handle Ack with header.highwater", args0: ConnectionId, args1: header?.highwater, args2: _sendHighwater);
HandleAck(header.highwater);
}
lock (_receivedPacketQueue)
{
if (_asyncReceives == 0)
{
_receivedPacketQueue.Enqueue(packet);
_packetEvent.Set();
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, _sequenceNumber {1}, _sendHighwater {2}, _receivedPacketQueue count {3}, packet event set", args0: ConnectionId, args1: _sequenceNumber, args2: _sendHighwater, args3: _receivedPacketQueue?.Count);
return;
}
_asyncReceives--;
Debug.Assert(_callbackObject != null);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, _sequenceNumber {1}, _sendHighwater {2}, _asyncReceives {3}", args0: ConnectionId, args1: _sequenceNumber, args2: _sendHighwater, args3: _asyncReceives);
((TdsParserStateObject)_callbackObject).ReadAsyncCallback(PacketHandle.FromManagedPacket(packet), 0);
}
_connection.ReturnPacket(packet);
}
lock (this)
{
_receiveHighwater++;
}
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, _asyncReceives {1}, _receiveHighwater {2}, _sendHighwater {3}, _receiveHighwaterLastAck {4}", args0: ConnectionId, args1: _asyncReceives, args2: _receiveHighwater, args3: _sendHighwater, args4: _receiveHighwaterLastAck);
SendAckIfNecessary();
}
finally
{
SqlClientEventSource.Log.TrySNIScopeLeaveEvent(scopeID);
}
}
private SNISMUXHeader SetupSMUXHeader(int length, SNISMUXFlags flags)
{
Debug.Assert(Monitor.IsEntered(this), "must take lock on self before updating smux header");
SNISMUXHeader header = new SNISMUXHeader();
header.Set(
smid: 83,
flags: (byte)flags,
sessionID: _sessionId,
length: (uint)SNISMUXHeader.HEADER_LENGTH + (uint)length,
sequenceNumber: ((flags == SNISMUXFlags.SMUX_FIN) || (flags == SNISMUXFlags.SMUX_ACK)) ? _sequenceNumber - 1 : _sequenceNumber++,
highwater: _receiveHighwater
);
_receiveHighwaterLastAck = header.Highwater;
return(header);
}
/// <summary>
/// Handle receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="header">SMUX header</param>
public void HandleReceiveComplete(SNIPacket packet, SNISMUXHeader header)
{
long scopeID = SqlClientEventSource.Log.SNIScopeEnterEvent("<sc.SNI.SNIMarsHandle.HandleReceiveComplete |SNI|INFO|SCOPE>");
try
{
lock (this)
{
if (_sendHighwater != header.highwater)
{
HandleAck(header.highwater);
}
lock (_receivedPacketQueue)
{
if (_asyncReceives == 0)
{
_receivedPacketQueue.Enqueue(packet);
_packetEvent.Set();
return;
}
_asyncReceives--;
Debug.Assert(_callbackObject != null);
((TdsParserStateObject)_callbackObject).ReadAsyncCallback(PacketHandle.FromManagedPacket(packet), 0);
}
_connection.ReturnPacket(packet);
}
lock (this)
{
_receiveHighwater++;
}
SendAckIfNecessary();
}
finally
{
SqlClientEventSource.Log.SNIScopeLeaveEvent(scopeID);
}
}
/// <summary>
/// Handle receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="header">SMUX header</param>
public void HandleReceiveComplete(SNIPacket packet, SNISMUXHeader header)
{
Debug.Assert(_connection != null && Monitor.IsEntered(_connection.DemuxerSync), "SNIMarsHandle.HandleRecieveComplete should be called while holding the SNIMarsConnection.DemuxerSync because it can cause deadlocks");
using (TrySNIEventScope.Create(nameof(SNIMarsHandle)))
{
lock (this)
{
if (_sendHighwater != header.Highwater)
{
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, header.highwater {1}, _sendHighwater {2}, Handle Ack with header.highwater", args0: ConnectionId, args1: header.Highwater, args2: _sendHighwater);
HandleAck(header.Highwater);
}
lock (_receivedPacketQueue)
{
if (_asyncReceives == 0)
{
_receivedPacketQueue.Enqueue(packet);
_packetEvent.Set();
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, _sequenceNumber {1}, _sendHighwater {2}, _receivedPacketQueue count {3}, packet event set", args0: ConnectionId, args1: _sequenceNumber, args2: _sendHighwater, args3: _receivedPacketQueue?.Count);
return;
}
_asyncReceives--;
Debug.Assert(_callbackObject != null);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, _sequenceNumber {1}, _sendHighwater {2}, _asyncReceives {3}", args0: ConnectionId, args1: _sequenceNumber, args2: _sendHighwater, args3: _asyncReceives);
((TdsParserStateObject)_callbackObject).ReadAsyncCallback(PacketHandle.FromManagedPacket(packet), 0);
}
_connection.ReturnPacket(packet);
}
lock (this)
{
_receiveHighwater++;
}
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, _asyncReceives {1}, _receiveHighwater {2}, _sendHighwater {3}, _receiveHighwaterLastAck {4}", args0: ConnectionId, args1: _asyncReceives, args2: _receiveHighwater, args3: _sendHighwater, args4: _receiveHighwaterLastAck);
SendAckIfNecessary();
}
}
/// <summary>
/// Send control packet
/// </summary>
/// <param name="flags">SMUX header flags</param>
private void SendControlPacket(SNISMUXFlags flags)
{
using (TrySNIEventScope.Create("SNIMarsHandle.SendControlPacket | SNI | INFO | SCOPE | Entering Scope {0}"))
{
SNIPacket packet = RentPacket(headerSize: SNISMUXHeader.HEADER_LENGTH, dataSize: 0);
#if DEBUG
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, Packet rented {1}, packet dataLeft {2}", args0: ConnectionId, args1: packet?._id, args2: packet?.DataLeft);
#endif
lock (this)
{
SNISMUXHeader header = SetupSMUXHeader(0, flags);
header.Write(packet.GetHeaderBuffer(SNISMUXHeader.HEADER_LENGTH));
packet.SetHeaderActive();
}
_connection.Send(packet);
ReturnPacket(packet);
#if DEBUG
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsHandle), EventType.INFO, "MARS Session Id {0}, Packet returned {1}, packet dataLeft {2}", args0: ConnectionId, args1: packet?._id, args2: packet?.DataLeft);
;
#endif
}
}
/// <summary>
/// Process a receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="sniErrorCode">SNI error code</param>
public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
{
long scopeID = SqlClientEventSource.Log.TrySNIScopeEnterEvent("<sc.SNI.SNIMarsConnection.HandleReceiveComplete |SNI|INFO|SCOPE>");
try
{
SNISMUXHeader currentHeader = null;
SNIPacket currentPacket = null;
SNIMarsHandle currentSession = null;
if (sniErrorCode != TdsEnums.SNI_SUCCESS)
{
lock (this)
{
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.SNIMarsConnection.HandleReceiveComplete |SNI|ERR> not successful.");
return;
}
}
while (true)
{
lock (this)
{
if (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
currentHeader = null;
currentPacket = null;
currentSession = null;
while (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
int bytesTaken = packet.TakeData(_headerBytes, _currentHeaderByteCount, SNISMUXHeader.HEADER_LENGTH - _currentHeaderByteCount);
_currentHeaderByteCount += bytesTaken;
if (bytesTaken == 0)
{
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
SqlClientEventSource.Log.TrySNITraceEvent("<sc.SNI.SNIMarsConnection.HandleReceiveComplete |SNI|ERR> not successful.");
return;
}
HandleReceiveError(packet);
return;
}
}
_currentHeader.Read(_headerBytes);
_dataBytesLeft = (int)_currentHeader.length;
_currentPacket = _lowerHandle.RentPacket(headerSize: 0, dataSize: (int)_currentHeader.length);
}
currentHeader = _currentHeader;
currentPacket = _currentPacket;
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
if (_dataBytesLeft > 0)
{
int length = packet.TakeData(_currentPacket, _dataBytesLeft);
_dataBytesLeft -= length;
if (_dataBytesLeft > 0)
{
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
return;
}
}
}
_currentHeaderByteCount = 0;
if (!_sessions.ContainsKey(_currentHeader.sessionId))
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.SMUX_PROV, 0, SNICommon.InvalidParameterError, Strings.SNI_ERROR_5);
HandleReceiveError(packet);
_lowerHandle.Dispose();
_lowerHandle = null;
return;
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_FIN)
{
_sessions.Remove(_currentHeader.sessionId);
}
else
{
currentSession = _sessions[_currentHeader.sessionId];
}
}
if (currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
currentSession.HandleReceiveComplete(currentPacket, currentHeader);
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_ACK)
{
try
{
currentSession.HandleAck(currentHeader.highwater);
}
catch (Exception e)
{
SNICommon.ReportSNIError(SNIProviders.SMUX_PROV, SNICommon.InternalExceptionError, e);
}
Debug.Assert(_currentPacket == currentPacket, "current and _current are not the same");
ReturnPacket(currentPacket);
currentPacket = null;
_currentPacket = null;
}
lock (this)
{
if (packet.DataLeft == 0)
{
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
return;
}
}
}
}
finally
{
SqlClientEventSource.Log.TrySNIScopeLeaveEvent(scopeID);
}
}
/// <summary>
/// Process a receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="sniErrorCode">SNI error code</param>
public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
{
SNISMUXHeader currentHeader = null;
SNIPacket currentPacket = null;
SNIMarsHandle currentSession = null;
if (sniErrorCode != TdsEnums.SNI_SUCCESS)
{
lock (this)
{
HandleReceiveError(packet);
return;
}
}
while (true)
{
lock (this)
{
if (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
currentHeader = null;
currentPacket = null;
currentSession = null;
while (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
int bytesTaken = packet.TakeData(_headerBytes, _currentHeaderByteCount, SNISMUXHeader.HEADER_LENGTH - _currentHeaderByteCount);
_currentHeaderByteCount += bytesTaken;
if (bytesTaken == 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
return;
}
}
_currentHeader.Read(_headerBytes);
_dataBytesLeft = (int)_currentHeader.length;
_currentPacket = new SNIPacket((int)_currentHeader.length);
}
currentHeader = _currentHeader;
currentPacket = _currentPacket;
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
if (_dataBytesLeft > 0)
{
int length = packet.TakeData(_currentPacket, _dataBytesLeft);
_dataBytesLeft -= length;
if (_dataBytesLeft > 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
return;
}
}
}
_currentHeaderByteCount = 0;
if (!_sessions.ContainsKey(_currentHeader.sessionId))
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.SMUX_PROV, 0, SNICommon.InvalidParameterError, string.Empty);
HandleReceiveError(packet);
_lowerHandle.Dispose();
_lowerHandle = null;
return;
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_FIN)
{
_sessions.Remove(_currentHeader.sessionId);
}
else
{
currentSession = _sessions[_currentHeader.sessionId];
}
}
if (currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
currentSession.HandleReceiveComplete(currentPacket, currentHeader);
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_ACK)
{
try
{
currentSession.HandleAck(currentHeader.highwater);
}
catch (Exception e)
{
SNICommon.ReportSNIError(SNIProviders.SMUX_PROV, SNICommon.InternalExceptionError, e);
}
}
lock (this)
{
if (packet.DataLeft == 0)
{
packet.Dispose();
packet = null;
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
return;
}
}
}
}
public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
{
using (TrySNIEventScope.Create(nameof(SNIMarsConnection)))
{
if (sniErrorCode != TdsEnums.SNI_SUCCESS)
{
lock (DemuxerSync)
{
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.ERR, "MARS Session Id {0}, Handled receive error code: {1}", args0: _lowerHandle?.ConnectionId, args1: sniErrorCode);
return;
}
}
State state = State.Demux;
State nextState = State.Demux;
SNISMUXHeader handleHeader = default;
SNIMarsHandle handleSession = null;
SNIPacket handlePacket = null;
while (state != State.Error && state != State.Finish)
{
switch (state)
{
case State.Demux:
lock (DemuxerSync)
{
switch (_demuxState)
{
case DemuxState.Header:
int taken = packet.TakeData(_headerBytes, _headerCount, SNISMUXHeader.HEADER_LENGTH - _headerCount);
_headerCount += taken;
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, took {1} header bytes", args0: _lowerHandle?.ConnectionId, args1: packet.DataLeft, args2: taken);
if (_headerCount == SNISMUXHeader.HEADER_LENGTH)
{
_header.Read(_headerBytes);
_payloadLength = (int)_header.Length;
_payloadCount = 0;
_demuxState = DemuxState.Payload;
state = State.Demux;
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, header complete, _payloadLength {1}", args0: _lowerHandle?.ConnectionId, args1: _payloadLength);
goto case DemuxState.Payload;
}
else
{
state = State.Receive;
}
break;
case DemuxState.Payload:
if (packet.DataLeft == _payloadLength && _partial == null)
{
// if the data in the packet being processed is exactly and only the data that is going to sent
// on to the parser then don't copy it to a new packet just forward the current packet once we've
// fiddled the data pointer so that it skips the header data
_partial = packet;
packet = null;
_partial.SetDataToRemainingContents();
_demuxState = DemuxState.Dispatch;
state = State.Demux;
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, forwarding packet contents", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
goto case DemuxState.Dispatch;
}
else
{
if (_partial == null)
{
_partial = RentPacket(headerSize: 0, dataSize: _payloadLength);
}
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, reconstructing packet contents", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
int wanted = _payloadLength - _payloadCount;
int transferred = SNIPacket.TransferData(packet, _partial, wanted);
_payloadCount += transferred;
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, took {1} payload bytes", args0: _lowerHandle?.ConnectionId, args1: transferred);
if (_payloadCount == _payloadLength)
{
// payload is complete so dispatch the current packet
_demuxState = DemuxState.Dispatch;
state = State.Receive;
goto case DemuxState.Dispatch;
}
else if (packet.DataLeft == 0)
{
// no more data in the delivered packet so wait for a new one
_demuxState = DemuxState.Payload;
state = State.Receive;
}
else
{
// data left in the delivered packet so start the demux loop
// again and decode the next packet in the input
_headerCount = 0;
_demuxState = DemuxState.Header;
state = State.Demux;
}
}
break;
case DemuxState.Dispatch:
if (_sessions.TryGetValue(_header.SessionId, out SNIMarsHandle session))
{
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, Current Session assigned to Session Id {1}", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
switch ((SNISMUXFlags)_header.Flags)
{
case SNISMUXFlags.SMUX_DATA:
handleSession = session;
session = null;
handleHeader = _header.Clone();
handlePacket = _partial;
_partial = null;
// move to the state for sending the data to the mars handle and setup
// the state that should be moved to after that operation has succeeded
state = State.HandleData;
if (packet != null && packet.DataLeft > 0)
{
nextState = State.Demux;
}
else
{
nextState = State.Receive;
}
break;
case SNISMUXFlags.SMUX_ACK:
handleSession = session;
session = null;
handleHeader = _header.Clone();
ReturnPacket(_partial);
_partial = null;
// move to the state for sending the data to the mars handle and setup
// the state that should be moved to after that operation has succeeded
state = State.HandleAck;
if (packet != null && packet.DataLeft > 0)
{
nextState = State.Demux;
}
else
{
nextState = State.Receive;
}
break;
case SNISMUXFlags.SMUX_FIN:
ReturnPacket(_partial);
_partial = null;
_sessions.Remove(_header.SessionId);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "SMUX_FIN | MARS Session Id {0}, SMUX_FIN flag received, Current Header Session Id {1} removed", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
break;
default:
Debug.Fail("unknown smux packet flag");
break;
}
// a full packet has been decoded and queued for sending by setting the state or the
// handle it was sent to no longer exists and the handle has been dropped. Now reset the
// demuxer state ready to recode another packet
_header.Clear();
_headerCount = 0;
_demuxState = DemuxState.Header;
// if the state is set to demux more data and there is no data left then change
// the state to request more data
if (state == State.Demux && (packet == null || packet.DataLeft == 0))
{
if (packet != null)
{
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, run out of data , queuing receive", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
}
state = State.Receive;
}
}
else
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.SMUX_PROV, 0, SNICommon.InvalidParameterError, string.Empty);
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.ERR, "Current Header Session Id {0} not found, MARS Session Id {1} will be destroyed, New SNI error created: {2}", args0: _header.SessionId, args1: _lowerHandle?.ConnectionId, args2: sniErrorCode);
packet = null;
_lowerHandle.Dispose();
_lowerHandle = null;
state = State.Error;
}
break;
}
}
break;
case State.HandleAck:
Debug.Assert(handleSession != null, "dispatching ack to null SNIMarsHandle");
Debug.Assert(!Monitor.IsEntered(DemuxerSync), "do not dispatch ack to session handle while holding the demuxer lock");
try
{
handleSession.HandleAck(handleHeader.Highwater);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "SMUX_ACK | MARS Session Id {0}, Current Session {1} handled ack", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
}
catch (Exception e)
{
SNICommon.ReportSNIError(SNIProviders.SMUX_PROV, SNICommon.InternalExceptionError, e);
}
finally
{
handleHeader = default;
handleSession = null;
}
state = nextState;
nextState = State.Finish;
break;
case State.HandleData:
Debug.Assert(handleSession != null, "dispatching data to null SNIMarsHandle");
Debug.Assert(handlePacket != null, "dispatching null data to SNIMarsHandle");
Debug.Assert(!Monitor.IsEntered(DemuxerSync), "do not dispatch data to session handle while holding the demuxer lock");
// do not ReturnPacket(handlePacket) the receiver is responsible for returning the packet
// once it has been used because it can take sync and async paths from to the receiver and
// only the reciever can make the decision on when it is completed and can be returned
try
{
handleSession.HandleReceiveComplete(handlePacket, handleHeader);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "SMUX_DATA | MARS Session Id {0}, Current Session {1} completed receiving Data", args0: _lowerHandle?.ConnectionId, args1: _header.SessionId);
}
finally
{
handleHeader = default;
handleSession = null;
handlePacket = null;
}
state = nextState;
nextState = State.Finish;
break;
case State.Receive:
if (packet != null)
{
Debug.Assert(packet.DataLeft == 0, "loop exit with data remaining");
ReturnPacket(packet);
packet = null;
}
lock (DemuxerSync)
{
uint receiveResult = ReceiveAsync(ref packet);
if (receiveResult == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.INFO, "MARS Session Id {0}, SMUX DATA Header SNI Packet received with code {1}", args0: ConnectionId, args1: receiveResult);
packet = null;
}
else
{
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(nameof(SNIMarsConnection), EventType.ERR, "MARS Session Id {0}, Handled receive error code: {1}", args0: _lowerHandle?.ConnectionId, args1: receiveResult);
}
}
state = State.Finish;
break;
}
}
}
}
/// <summary>
/// Process a receive completion
/// </summary>
/// <param name="packet">SNI packet</param>
/// <param name="sniErrorCode">SNI error code</param>
public void HandleReceiveComplete(SNIPacket packet, uint sniErrorCode)
{
long scopeID = SqlClientEventSource.Log.TrySNIScopeEnterEvent(s_className);
try
{
SNISMUXHeader currentHeader = null;
SNIPacket currentPacket = null;
SNIMarsHandle currentSession = null;
if (sniErrorCode != TdsEnums.SNI_SUCCESS)
{
lock (this)
{
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "MARS Session Id {0}, Handled receive error code: {1}", args0: _lowerHandle?.ConnectionId, args1: sniErrorCode);
return;
}
}
while (true)
{
lock (this)
{
if (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
currentHeader = null;
currentPacket = null;
currentSession = null;
while (_currentHeaderByteCount != SNISMUXHeader.HEADER_LENGTH)
{
int bytesTaken = packet.TakeData(_headerBytes, _currentHeaderByteCount, SNISMUXHeader.HEADER_LENGTH - _currentHeaderByteCount);
_currentHeaderByteCount += bytesTaken;
if (bytesTaken == 0)
{
sniErrorCode = ReceiveAsync(ref packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, Non-SMUX Header SNI Packet received with code {1}", args0: ConnectionId, args1: sniErrorCode);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "MARS Session Id {0}, Handled receive error code: {1}", args0: _lowerHandle?.ConnectionId, args1: sniErrorCode);
return;
}
}
_currentHeader.Read(_headerBytes);
_dataBytesLeft = (int)_currentHeader.length;
_currentPacket = _lowerHandle.RentPacket(headerSize: 0, dataSize: (int)_currentHeader.length);
#if DEBUG
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, _dataBytesLeft {1}, _currentPacket {2}, Reading data of length: _currentHeader.length {3}", args0: _lowerHandle?.ConnectionId, args1: _dataBytesLeft, args2: currentPacket?._id, args3: _currentHeader?.length);
#endif
}
currentHeader = _currentHeader;
currentPacket = _currentPacket;
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
if (_dataBytesLeft > 0)
{
int length = packet.TakeData(_currentPacket, _dataBytesLeft);
_dataBytesLeft -= length;
if (_dataBytesLeft > 0)
{
sniErrorCode = ReceiveAsync(ref packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, SMUX DATA Header SNI Packet received with code {1}, _dataBytesLeft {2}", args0: ConnectionId, args1: sniErrorCode, args2: _dataBytesLeft);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "MARS Session Id {0}, Handled receive error code: {1}", args0: _lowerHandle?.ConnectionId, args1: sniErrorCode);
return;
}
}
}
_currentHeaderByteCount = 0;
if (!_sessions.ContainsKey(_currentHeader.sessionId))
{
SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.SMUX_PROV, 0, SNICommon.InvalidParameterError, Strings.SNI_ERROR_5);
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "Current Header Session Id {0} not found, MARS Session Id {1} will be destroyed, New SNI error created: {2}", args0: _currentHeader?.sessionId, args1: _lowerHandle?.ConnectionId, args2: sniErrorCode);
_lowerHandle.Dispose();
_lowerHandle = null;
return;
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_FIN)
{
_sessions.Remove(_currentHeader.sessionId);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "SMUX_FIN | MARS Session Id {0}, SMUX_FIN flag received, Current Header Session Id {1} removed", args0: _lowerHandle?.ConnectionId, args1: _currentHeader?.sessionId);
}
else
{
currentSession = _sessions[_currentHeader.sessionId];
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "MARS Session Id {0}, Current Session assigned to Session Id {1}", args0: _lowerHandle?.ConnectionId, args1: _currentHeader?.sessionId);
}
}
if (currentHeader.flags == (byte)SNISMUXFlags.SMUX_DATA)
{
currentSession.HandleReceiveComplete(currentPacket, currentHeader);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "SMUX_DATA | MARS Session Id {0}, Current Session {1} completed receiving Data", args0: _lowerHandle?.ConnectionId, args1: _currentHeader?.sessionId);
}
if (_currentHeader.flags == (byte)SNISMUXFlags.SMUX_ACK)
{
try
{
currentSession.HandleAck(currentHeader.highwater);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "SMUX_ACK | MARS Session Id {0}, Current Session {1} handled ack", args0: _lowerHandle?.ConnectionId, args1: _currentHeader?.sessionId);
}
catch (Exception e)
{
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "SMUX_ACK | MARS Session Id {0}, Exception occurred: {2}", args0: _currentHeader?.sessionId, args1: e?.Message);
SNICommon.ReportSNIError(SNIProviders.SMUX_PROV, SNICommon.InternalExceptionError, e);
}
#if DEBUG
Debug.Assert(_currentPacket == currentPacket, "current and _current are not the same");
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.INFO, "SMUX_ACK | MARS Session Id {0}, Current Packet {1} returned", args0: _lowerHandle?.ConnectionId, args1: currentPacket?._id);
#endif
ReturnPacket(currentPacket);
currentPacket = null;
_currentPacket = null;
}
lock (this)
{
if (packet.DataLeft == 0)
{
sniErrorCode = ReceiveAsync(ref packet);
if (sniErrorCode == TdsEnums.SNI_SUCCESS_IO_PENDING)
{
return;
}
HandleReceiveError(packet);
SqlClientEventSource.Log.TrySNITraceEvent(s_className, EventType.ERR, "MARS Session Id {0}, packet.DataLeft 0, SNI error {2}", args0: _lowerHandle?.ConnectionId, args1: sniErrorCode);
return;
}
}
}
}
finally
{
SqlClientEventSource.Log.TrySNIScopeLeaveEvent(scopeID);
}
}
