replace xnet.Transport by xnet.Pipe

internal/net/pipe.go

@@ -0,0 +1,76 @@
+package net
+
+import (
+	"context"
+	"io"
+	"sync"
+	"time"
+
+	"github.com/go-gost/core/common/bufpool"
+	xio "github.com/go-gost/x/internal/io"
+)
+
+const (
+	// tcpWaitTimeout implements a TCP half-close timeout.
+	tcpWaitTimeout = 30 * time.Second
+)
+
+func Pipe(ctx context.Context, rw1, rw2 io.ReadWriter) error {
+	wg := sync.WaitGroup{}
+	wg.Add(2)
+
+	ch := make(chan error, 2)
+
+	go func() {
+		defer wg.Done()
+		if err := pipeBuffer(rw1, rw2, bufferSize/2); err != nil {
+			ch <- err
+		}
+	}()
+	go func() {
+		defer wg.Done()
+		if err := pipeBuffer(rw2, rw1, bufferSize/2); err != nil {
+			ch <- err
+		}
+	}()
+
+	done := make(chan struct{})
+	go func() {
+		wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+	case <-ctx.Done():
+		return nil
+	}
+
+	select {
+	case err := <-ch:
+		return err
+	default:
+	}
+
+	return nil
+}
+
+func pipeBuffer(dst io.ReadWriter, src io.ReadWriter, bufferSize int) error {
+	buf := bufpool.Get(bufferSize)
+	defer bufpool.Put(buf)
+
+	_, err := io.CopyBuffer(dst, src, buf)
+
+	// Do the upload/download side TCP half-close.
+	if cr, ok := src.(xio.CloseRead); ok {
+		cr.CloseRead()
+	}
+	if cw, ok := dst.(xio.CloseWrite); ok {
+		cw.CloseWrite()
+	}
+
+	// Set TCP half-close timeout.
+	xio.SetReadDeadline(dst, time.Now().Add(tcpWaitTimeout))
+
+	return err
+}