我注意到了新的System.IO.Pipelines并正在尝试将现有的基于流的代码移植到其中。流的问题是众所周知的,但同时它具有丰富的相关类生态系统。
从这里提供的示例中,有一个小的tcp回声服务器。 https://blogs.msdn.microsoft.com/dotnet/2018/07/09/system-io-pipelines-high-performance-io-in-net/
这里附上一段代码片段:
private static async Task ProcessLinesAsync(Socket socket)
{
Console.WriteLine($"[{socket.RemoteEndPoint}]: connected");
var pipe = new Pipe();
Task writing = FillPipeAsync(socket, pipe.Writer);
Task reading = ReadPipeAsync(socket, pipe.Reader);
await Task.WhenAll(reading, writing);
Console.WriteLine($"[{socket.RemoteEndPoint}]: disconnected");
}
private static async Task FillPipeAsync(Socket socket, PipeWriter writer)
{
const int minimumBufferSize = 512;
while (true)
{
try
{
// Request a minimum of 512 bytes from the PipeWriter
Memory<byte> memory = writer.GetMemory(minimumBufferSize);
int bytesRead = await socket.ReceiveAsync(memory, SocketFlags.None);
if (bytesRead == 0)
{
break;
}
// Tell the PipeWriter how much was read
writer.Advance(bytesRead);
}
catch
{
break;
}
// Make the data available to the PipeReader
FlushResult result = await writer.FlushAsync();
if (result.IsCompleted)
{
break;
}
}
// Signal to the reader that we're done writing
writer.Complete();
}
private static async Task ReadPipeAsync(Socket socket, PipeReader reader)
{
while (true)
{
ReadResult result = await reader.ReadAsync();
ReadOnlySequence<byte> buffer = result.Buffer;
SequencePosition? position = null;
do
{
// Find the EOL
position = buffer.PositionOf((byte)'\n');
if (position != null)
{
var line = buffer.Slice(0, position.Value);
ProcessLine(socket, line);
// This is equivalent to position + 1
var next = buffer.GetPosition(1, position.Value);
// Skip what we've already processed including \n
buffer = buffer.Slice(next);
}
}
while (position != null);
// We sliced the buffer until no more data could be processed
// Tell the PipeReader how much we consumed and how much we left to process
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
reader.Complete();
}
private static void ProcessLine(Socket socket, in ReadOnlySequence<byte> buffer)
{
if (_echo)
{
Console.Write($"[{socket.RemoteEndPoint}]: ");
foreach (var segment in buffer)
{
Console.Write(Encoding.UTF8.GetString(segment.Span));
}
Console.WriteLine();
}
}
使用流时,您可以通过将其包装在SslStream中轻松地向代码添加SSL/TLS。Pipelines如何解决这个问题?