/// <summary>
/// Attempts to read a frame
/// </summary>
/// <param name="frame"></param>
/// <returns></returns>
public bool ReadFrame(out PipeFrame frame)
{
//Make sure we are connected
if (!IsConnected)
{
throw new InvalidPipeException("Cannot read Native Stream as pipe is not connected");
}
//Try and read the frame from the native pipe
int bytesRead = NativePipe.ReadFrame(_buffer, _buffer.Length);
if (bytesRead <= 0)
{
//Update the error message
_lasterr = NativePipe.PipeReadError.ReadEmptyMessage;
//A error actively occured. If it is 0 we just read no bytes.
if (bytesRead < 0)
{
//We have a pretty bad error, we will log it for prosperity.
_lasterr = (NativePipe.PipeReadError)bytesRead;
Logger.Error("Native pipe failed to read: {0}", _lasterr.ToString());
//Close this pipe
this.Close();
}
//Return a empty frame and return false (read failure).
frame = default(PipeFrame);
return(false);
}
//Parse the pipe
using (MemoryStream stream = new MemoryStream(_buffer, 0, bytesRead))
{
//Try to parse the stream
frame = new PipeFrame();
if (frame.ReadStream(stream) && frame.Length != 0)
{
return(true);
}
//We failed
Logger.Error("Pipe failed to read from the data received by the stream.");
return(false);
}
}
private void EndRead(IAsyncResult callback)
{
Logger.Info("Ending Read");
int bytes = 0;
try
{
//Attempt to read the bytes, catching for IO exceptions or dispose exceptions
bytes = _stream.EndRead(callback);
}
catch (IOException)
{
Logger.Warning("Attempted to end reading from a closed pipe");
return;
}
catch (NullReferenceException)
{
Logger.Warning("Attempted to read from a null pipe");
return;
}
catch (ObjectDisposedException)
{
Logger.Warning("Attemped to end reading from a disposed pipe");
return;
}
catch (Exception e)
{
Logger.Error("A unkown error has occured while reading a pipe: " + e.Message);
return;
}
//How much did we read?
Logger.Info("Read {0} bytes", bytes);
//Did we read anything? If we did we should enqueue it.
if (bytes > 0)
{
//Load it into a memory stream and read the frame
using (MemoryStream stream = new MemoryStream(_buffer, 0, bytes))
{
try
{
PipeFrame frame = new PipeFrame();
if (frame.ReadStream(stream))
{
Logger.Info("Read a frame: {0}", frame.Opcode);
//Enqueue the stream
lock (_framequeuelock)
_framequeue.Enqueue(frame);
}
else
{
//TODO: Enqueue a pipe close event here as we failed to read something.
Logger.Error("Pipe failed to read from the data received by the stream.");
}
}
catch (Exception e)
{
Logger.Error("A exception has occured while trying to parse the pipe data: " + e.Message);
}
}
}
//We are still connected, so continue to read
if (IsConnected)
{
Logger.Info("Starting another read");
BeginRead();
}
}