Proper DoSend pipeline loop

Transport.cs

while (true)
{
    // Get data from the send buffer
    var result = await reader.ReadAsync().ConfigureAwait(false);
    if (result.IsCanceled)
    {
        break;
    }

    // Write to the socket
    var buffers = result.Buffer;
    if (!buffers.IsEmpty)
    {
        int bytesSent;
        if (buffers.IsSingleSegment)
        {
            bytesSent = await _socket!.SendAsync(buffers.First, SocketFlags.None).ConfigureAwait(false);
        }
        else
        {
            // HELP!!!
            bytesSent = 0;
        }

        reader.AdvanceTo(buffers.GetPosition(bytesSent));
        if (result.IsCompleted)
        {
            break;
        }
    }
}

@davidfowl if you have a moment, I'm trying to understand and replicate the DoSend and DoRecieve methods of the SocketConnection class in Kestrel. In that implementation there is a complicated SocketAsyncEventArgs derived class that I'm trying to avoid by using the standard Socket extension methods. However, there is not a good way or example I can find for sending a ReadOnlySequence<byte> instead of a simple ReadOnlyMemory<byte> -- noted by the HELP!!! comment above.

This question has been discussed in:

• dotnet/runtime#27486
• dotnet/runtime#49941

I'm not looking for a first-class implementation, just some guidance on the best way to send multiple buffers to avoid copies and loops (if possible).

Thx

I ended up following the SendMultiSegmentAsync approach used in SignalR. A little more basic than I expected, but I guess if it is good enough for SignalR....