busy wait on writing

transport/ray/direct.go

@@ -1,8 +1,10 @@
 package ray
 
 import (
+	"errors"
 	"io"
 	"sync"
+	"time"
 
 	"github.com/v2ray/v2ray-core/common/alloc"
 )
@@ -11,6 +13,10 @@ const (
 	bufferSize = 128
 )
 
+var (
+	ErrorIOTimeout = errors.New("IO Timeout")
+)
+
 // NewRay creates a new Ray for direct traffic transport.
 func NewRay() Ray {
 	return &directRay{
@@ -74,13 +80,26 @@ func (this *Stream) Write(data *alloc.Buffer) error {
 	if this.closed {
 		return io.EOF
 	}
+	for {
+		err := this.TryWriteOnce(data)
+		if err != ErrorIOTimeout {
+			return err
+		}
+	}
+}
+
+func (this *Stream) TryWriteOnce(data *alloc.Buffer) error {
 	this.access.RLock()
 	defer this.access.RUnlock()
 	if this.closed {
 		return io.EOF
 	}
-	this.buffer <- data
+	select {
+	case this.buffer <- data:
 		return nil
+	case <-time.Tick(time.Second):
+		return ErrorIOTimeout
+	}
 }
 
 func (this *Stream) Close() {