update sing-box support

common/rate/writer.go

@@ -0,0 +1,28 @@
+package rate
+
+import (
+	"github.com/juju/ratelimit"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+)
+
+type Writer struct {
+	writer  buf.Writer
+	limiter *ratelimit.Bucket
+}
+
+func NewRateLimitWriter(writer buf.Writer, limiter *ratelimit.Bucket) buf.Writer {
+	return &Writer{
+		writer:  writer,
+		limiter: limiter,
+	}
+}
+
+func (w *Writer) Close() error {
+	return common.Close(w.writer)
+}
+
+func (w *Writer) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	w.limiter.Wait(int64(mb.Len()))
+	return w.writer.WriteMultiBuffer(mb)
+}