move size stats writer into vio

common/vio/stats.go

@@ -1,4 +1,4 @@
-package stats
+package vio
 
 import (
 	"v2ray.com/core/common"

common/vio/stats_test.go

@@ -0,0 +1,46 @@
+package vio_test
+
+import (
+	"testing"
+
+	"v2ray.com/core/common"
+	"v2ray.com/core/common/buf"
+	. "v2ray.com/core/common/vio"
+)
+
+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())
+	}
+}