internal void Send(uint responseId, ServiceProtocolResponse response)
{
var newValue = Interlocked.Increment(ref responsesQueueSize);
Thread.MemoryBarrier();
responsesQueue.Enqueue(new Response {
id = responseId, response = response
});
if (newValue == 1)
{
Task.Run(() => SendResponse());
}
}
public void SendResponse(ServiceProtocolResponse response)
{
if (response == null)
{
throw new ArgumentNullException(nameof(response));
}
if (connection == null)
{
throw new InvalidOperationException("Access denied!");
}
if (id == ServiceProtocolDataContract.RequestIdWithoutResponse)
{
throw new InvalidOperationException("This request is not associated with any response!");
}
connection.Send(id, response);
connection = null;
}
private void SendResponse()
{
try
{
currentResponsesCount = 0;
packStream.Position = 0;
while (true)
{
var lastPos = (int)packStream.Position;
var response = GetNextResponse(currentResponsesCount == 0);
if (response.response == null)
{
break;
}
packStream.Position += ServiceProtocolResponse.HeaderSize;
var startPos = (int)packStream.Position;
byte kind = 0;
if (response.response.Code == ServiceProtocolResponseCode.Success)
{
if (!server.dataContract.responsePackers.TryGetValue(response.response.GetType(), out var packerInfo))
{
server.logger.Fatal($"Service protocol server: Could not find response packer by type: {response.response.GetType()}");
packStream.Position = lastPos;
goto AfterResponsePackError;
}
kind = packerInfo.kind;
try
{
packerInfo.packer(packWriter, response.response);
}
catch (Exception e)
{
server.logger.Fatal($"Service protocol server: Could not pack response! Type: {response.response.GetType()} Details: {e}");
packStream.Position = lastPos;
goto AfterResponsePackError;
}
}
var endPos = (int)packStream.Position;
var responseSize = endPos - startPos;
if (responseSize > ServiceProtocolResponse.MaxSize)
{
server.logger.Fatal(
$"Service protocol server: Could not send response! Response length exceeds allowed size! Type: {response.response.GetType()} Size: {responseSize} Max size: {ServiceProtocolResponse.MaxSize}");
packStream.Position = lastPos;
goto AfterResponsePackError;
}
ServiceProtocolResponse.WriteHeader(sendArgs.Buffer, lastPos, response.id, kind, response.response.Code, (ushort)responseSize);
AfterResponsePackError:
currentResponsesCount++;
if (packStream.Position >= server.dataContract.responseBufferSize)
{
break;
}
}
Thread.MemoryBarrier();
sendArgs.SetBuffer(0, (int)packStream.Position);
if (!socket.SendAsync(sendArgs))
{
SendingComplete(null, sendArgs);
}
}
catch (Exception e) when(e is ObjectDisposedException || e is SocketException || e is NotSupportedException)
{
}
catch (Exception e)
{
server.logger.Fatal($"Service protocol server: Internal error! Details: {e}");
}
}
private void Receive(object sender, SocketAsyncEventArgs args)
{
if (args.BytesTransferred == 0 || args.SocketError != SocketError.Success)
{
if (args.SocketError != SocketError.Success)
{
logger.Error($"Service protocol client {id}: Connection closed! Reason: {args.SocketError}");
}
DisconnectLogic();
return;
}
lastConnectionActiveTime = Environment.TickCount;
var bytesAvailable = args.Offset + args.BytesTransferred;
var offset = 0;
while (true)
{
if (bytesAvailable < ServiceProtocolResponse.HeaderSize)
{
goto ContinueReceive;
}
ServiceProtocolResponse.ReadHeader(args.Buffer, offset, out var responseId, out var responseKind, out var responseCode, out var responseSize);
if (bytesAvailable - ServiceProtocolResponse.HeaderSize < responseSize)
{
goto ContinueReceive;
}
offset += ServiceProtocolResponse.HeaderSize;
bytesAvailable -= ServiceProtocolResponse.HeaderSize;
unpackStream.Position = offset;
if (responseCode == ServiceProtocolResponseCode.Success)
{
if (responseKind >= dataContract.responseUnpackers.Length)
{
logger.Error($"Service protocol client {id}: Received invalid response kind!");
DisconnectLogic();
return;
}
var unpacker = dataContract.responseUnpackers[responseKind];
if (unpacker == null)
{
logger.Error($"Service protocol client {id}: Could not find response unpacker by kind {responseKind}!");
DisconnectLogic();
return;
}
ServiceProtocolResponse response;
try
{
response = unpacker(unpackReader);
}
catch (Exception e)
{
logger.Fatal($"Service protocol client {id}: Could not unpack response! Kind: {responseKind} Details: {e}");
DisconnectLogic();
return;
}
var realUnpackedSize = (int)(unpackStream.Position - offset);
if (realUnpackedSize != responseSize)
{
logger.Error($"Service protocol client {id}: Could not unpack response! Kind: {responseKind} Real unpacked size not equal with size in header!");
DisconnectLogic();
return;
}
bytesAvailable -= responseSize;
offset += responseSize;
ServiceProtocolResponse.localThreadResponse = response;
}
GetContinuation:
var continuation = requestContinuations[responseId];
if (continuation == null)
{
Thread.SpinWait(1);
goto GetContinuation;
}
Thread.MemoryBarrier();
while (Interlocked.CompareExchange(ref requestStates[responseId], RequestStateInactive, RequestStateAfterSend) != RequestStateAfterSend)
{
}
Thread.MemoryBarrier();
requestContinuations[responseId] = null;
Thread.MemoryBarrier();
ServiceProtocolResponse.localThreadCodeForErrorResponses = responseCode;
try
{
continuation();
}
catch (Exception e)
{
logger.Fatal($"Service protocol client {id}: Could not process request continuation! Details: {e}");
}
if (bytesAvailable == 0)
{
goto ContinueReceive;
}
}
ContinueReceive:
if (bytesAvailable > 0)
{
Array.Copy(args.Buffer, offset, args.Buffer, 0, bytesAvailable);
}
args.SetBuffer(bytesAvailable, args.Buffer.Length - bytesAvailable);
if (!socket.ReceiveAsync(args))
{
Receive(null, args);
}
}