remove vio package

app/dispatcher/default.go

@@ -15,7 +15,6 @@ import (
 	"v2ray.com/core/common/net"
 	"v2ray.com/core/common/protocol"
 	"v2ray.com/core/common/session"
-	"v2ray.com/core/common/vio"
 	"v2ray.com/core/features/outbound"
 	"v2ray.com/core/features/policy"
 	"v2ray.com/core/features/routing"
@@ -151,7 +150,7 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 		if p.Stats.UserUplink {
 			name := "user>>>" + user.Email + ">>>traffic>>>uplink"
 			if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
-				inboundLink.Writer = &vio.SizeStatWriter{
+				inboundLink.Writer = &SizeStatWriter{
 					Counter: c,
 					Writer:  inboundLink.Writer,
 				}
@@ -160,7 +159,7 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 		if p.Stats.UserDownlink {
 			name := "user>>>" + user.Email + ">>>traffic>>>downlink"
 			if c, _ := stats.GetOrRegisterCounter(d.stats, name); c != nil {
-				outboundLink.Writer = &vio.SizeStatWriter{
+				outboundLink.Writer = &SizeStatWriter{
 					Counter: c,
 					Writer:  outboundLink.Writer,
 				}

app/dispatcher/stats.go

@@ -0,0 +1,26 @@
+package dispatcher
+
+import (
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/buf"
+	"v2ray.com/core/features/stats"
+	"v2ray.com/core/transport/pipe"
+)
+
+type SizeStatWriter struct {
+	Counter stats.Counter
+	Writer  buf.Writer
+}
+
+func (w *SizeStatWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	w.Counter.Add(int64(mb.Len()))
+	return w.Writer.WriteMultiBuffer(mb)
+}
+
+func (w *SizeStatWriter) Close() error {
+	return common.Close(w.Writer)
+}
+
+func (w *SizeStatWriter) CloseError() {
+	pipe.CloseError(w.Writer)
+}

app/dispatcher/stats_test.go

@@ -0,0 +1,46 @@
+package dispatcher_test
+
+import (
+	"testing"
+
+	. "v2ray.com/core/app/dispatcher"
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/buf"
+)
+
+type TestCounter int64
+
+func (c *TestCounter) Value() int64 {
+	return int64(*c)
+}
+
+func (c *TestCounter) Add(v int64) int64 {
+	x := int64(*c) + v
+	*c = TestCounter(x)
+	return x
+}
+
+func (c *TestCounter) Set(v int64) int64 {
+	*c = TestCounter(v)
+	return v
+}
+
+func TestStatsWriter(t *testing.T) {
+	var c TestCounter
+	writer := &SizeStatWriter{
+		Counter: &c,
+		Writer:  buf.Discard,
+	}
+
+	var mb buf.MultiBuffer
+	common.Must2(mb.Write([]byte("abcd")))
+	common.Must(writer.WriteMultiBuffer(mb))
+
+	mb.Release()
+	common.Must2(mb.Write([]byte("efg")))
+	common.Must(writer.WriteMultiBuffer(mb))
+
+	if c.Value() != 7 {
+		t.Fatal("unexpected counter value. want 7, but got ", c.Value())
+	}
+}