private static void InitHeader(byte[] arrPayload, ref GatewayPayload payload)
{
// Create a BinaryReader around the incoming array to parse the data out of it
MemoryStream msPayload = new MemoryStream(arrPayload);
BinaryReader reader = new BinaryReader(msPayload);
payload.Mode = (BlockMode)reader.ReadUInt32();
// Skip over the ActualPayloadSize field
reader.ReadUInt32();
payload.OffsetToRW = reader.ReadUInt64();
payload.SizePayloadBuffer = reader.ReadUInt32();
payload.LengthDeviceID = reader.ReadUInt32();
// Read the SRB address
payload.SRBAddress = new UIntPtr(reader.ReadUInt64());
// Read the deviceID string
byte[] arrDeviceID = reader.ReadBytes((int)payload.LengthDeviceID);
unsafe
{
fixed(byte *pDeviceID = arrDeviceID)
{
IntPtr ptrDeviceID = new IntPtr(pDeviceID);
payload.DeviceID = Marshal.PtrToStringUni(ptrDeviceID);
}
}
// Fetch the EndOfPayloadMarker
payload.EndOfPayloadMarker = reader.ReadUInt32();
reader.Close();
}
private static GatewayPayload HandleProcessPayloadException(ref GatewayPayload payload, Exception ex)
{
Console.WriteLine("SFBlockstoreService::HandleProcessPayloadException: Got an exception [{0} - {1}] while processing payload.", ex.GetType(), ex.Message);
// Build the payload information to be dumped.
StringBuilder sbPayloadInfo = new StringBuilder();
sbPayloadInfo.AppendLine(String.Format("Mode: {0:X}", payload.Mode));
sbPayloadInfo.AppendLine(String.Format("Offset: {0:X}", payload.OffsetToRW));
sbPayloadInfo.AppendLine(String.Format("Length to R/W: {0:X}", payload.SizePayloadBuffer));
sbPayloadInfo.AppendLine(String.Format("DeviceID Length: {0:X}", payload.LengthDeviceID));
sbPayloadInfo.AppendLine(String.Format("DeviceID: {0}", payload.DeviceID));
sbPayloadInfo.AppendLine(String.Format("EndOfPayloadMarker: {0:X}", payload.EndOfPayloadMarker));
Console.WriteLine(sbPayloadInfo.ToString());
// TODO: Can we do this better?
// Payload processing failed - Reflect in the payload status
uint expectedResponsePayloadSize = (uint)GatewayPayloadConst.blockSizeManagementRequest;
if (payload.Mode == BlockMode.Read)
{
if (payload.UseDMA)
{
// We do not have any payload to send for the DMA scenario.
expectedResponsePayloadSize = 0;
}
else
{
// Read request's receiver is expecting the intended size
expectedResponsePayloadSize = payload.SizePayloadBuffer;
}
}
else if (payload.Mode == BlockMode.Write)
{
// Write request's receiver is expected only the payload header.
expectedResponsePayloadSize = 0;
}
else
{
// All other requests (e.g. LU registration) expected the default (BlockSizeManagementRequest sized) payload size.
}
payload.SizePayloadBuffer = expectedResponsePayloadSize;
payload.PayloadData = null;
if (payload.EndOfPayloadMarker != GatewayPayloadConst.EndOfPayloadMarker)
{
// We got a payload that was invalid, so reflect that
// in the mode we will send back
payload.Mode = BlockMode.ServerInvalidPayload;
Console.WriteLine("SFBlockstoreService::HandleProcessPayloadException: Client sent an invalid payload.");
}
else
{
payload.Mode = BlockMode.OperationFailed;
}
return(payload);
}
private void ProcessNPClient(NamedPipeServerStream pipeServer, CancellationToken cancellationToken)
{
if (!cancellationToken.IsCancellationRequested)
{
byte[] arrHeader = null;
try
{
while (pipeServer.IsConnected && (!cancellationToken.IsCancellationRequested))
{
// Fetch the header from the stream
arrHeader = new byte[GatewayPayloadConst.payloadHeaderSize];
int iTotalRead = FetchDataFromTransport(null, pipeServer, arrHeader, GatewayPayloadConst.payloadHeaderSize);
if (iTotalRead > 0)
{
// Did we get a buffer of expected size?
if (iTotalRead != GatewayPayloadConst.payloadHeaderSize)
{
throw new InvalidOperationException(String.Format("SFBlockstoreService::ProcessNPClient: Malformed request of size {0} encountered; expected size is {1}", iTotalRead, GatewayPayloadConst.payloadHeaderSize));
}
GatewayPayload payload = GatewayPayload.ParseHeader(arrHeader, pipeServer, this);
// Process the payload
try
{
payload.ProcessPayload(serviceBlockStore, cancellationToken);
}
catch (Exception ex)
{
HandleProcessPayloadException(ref payload, ex);
}
// Send the Data back to the sender
payload.SendResponse();
}
}
}
catch (IOException)
{
// Network connection was closed
}
catch (ObjectDisposedException)
{
// Network connection was closed
}
catch (Exception ex)
{
Console.WriteLine("SFBlockstoreService::ProcessNPClient: Got an exception [{0} - {1}] while handling incoming request.", ex.GetType().ToString(), ex.Message);
}
// If we are here, we are not in a position to process the network requests and thus, should close
// the connection.
if (pipeServer != null)
{
pipeServer.Close();
}
}
}
public static GatewayPayload ParseHeader(byte[] arrPayload, NamedPipeServerStream pipeServer, SFBlockStoreCommunicationListener commListener)
{
GatewayPayload payload = new GatewayPayload();
payload.PipeServer = pipeServer;
payload.ClientStream = null;
payload.CommunicationListener = commListener;
InitHeader(arrPayload, ref payload);
return(payload);
}
private void ProcessTcpClient(CancellationToken cancellationToken, TcpClient tcpClient)
{
if (!cancellationToken.IsCancellationRequested)
{
NetworkStream ns = null;
byte[] arrHeader = null;
try
{
try
{
ns = tcpClient.GetStream();
}
catch (InvalidOperationException)
{
Console.WriteLine("SFBlockstoreService::ProcessTCPClient: Unable to get NetworkStream to read data!");
tcpClient.Close();
ns = null;
}
while ((ns != null) && (tcpClient.Connected) && (!cancellationToken.IsCancellationRequested))
{
// Fetch the header from the stream
arrHeader = new byte[GatewayPayloadConst.payloadHeaderSize];
int iTotalRead = FetchDataFromTransport(ns, null, arrHeader, GatewayPayloadConst.payloadHeaderSize);
if (iTotalRead > 0)
{
// Did we get a buffer of expected size?
if (iTotalRead != GatewayPayloadConst.payloadHeaderSize)
{
throw new InvalidOperationException(String.Format("SFBlockstoreService::ProcessTCPClient: Malformed request of size {0} encountered; expected size is {1}", iTotalRead, GatewayPayloadConst.payloadHeaderSize));
}
GatewayPayload payload = GatewayPayload.ParseHeader(arrHeader, ns, this);
// Process the payload
try
{
payload.ProcessPayload(serviceBlockStore, cancellationToken);
}
catch (Exception ex)
{
HandleProcessPayloadException(ref payload, ex);
}
// Send the Data back to the sender
payload.SendResponse();
}
else
{
//Remote socket is terminated.
break;
}
}
}
catch (IOException)
{
// Network connection was closed
}
catch (ObjectDisposedException)
{
// Network connection was closed
}
catch (Exception ex)
{
Console.WriteLine("SFBlockstoreService::ProcessTCPClient: Got an exception [{0} - {1}] while handling incoming request.", ex.GetType().ToString(), ex.Message);
}
// If we are here, we are not in a position to process the network requests and thus, should close
// the connection.
if (tcpClient != null)
{
tcpClient.Close();
}
}
}
