refactor: Implement extended IO

tunnel/statistic/tracker.go

@@ -7,6 +7,9 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 
 	"github.com/gofrs/uuid"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/bufio"
+	"github.com/sagernet/sing/common/network"
 	"go.uber.org/atomic"
 )
 
@@ -29,7 +32,9 @@ type trackerInfo struct {
 type tcpTracker struct {
 	C.Conn `json:"-"`
 	*trackerInfo
-	manager *Manager
+	manager        *Manager
+	extendedReader network.ExtendedReader
+	extendedWriter network.ExtendedWriter
 }
 
 func (tt *tcpTracker) ID() string {
@@ -44,6 +49,14 @@ func (tt *tcpTracker) Read(b []byte) (int, error) {
 	return n, err
 }
 
+func (tt *tcpTracker) ReadBuffer(buffer *buf.Buffer) (err error) {
+	err = tt.extendedReader.ReadBuffer(buffer)
+	download := int64(buffer.Len())
+	tt.manager.PushDownloaded(download)
+	tt.DownloadTotal.Add(download)
+	return
+}
+
 func (tt *tcpTracker) Write(b []byte) (int, error) {
 	n, err := tt.Conn.Write(b)
 	upload := int64(n)
@@ -52,11 +65,26 @@ func (tt *tcpTracker) Write(b []byte) (int, error) {
 	return n, err
 }
 
+func (tt *tcpTracker) WriteBuffer(buffer *buf.Buffer) (err error) {
+	err = tt.extendedWriter.WriteBuffer(buffer)
+	var upload int64
+	if err != nil {
+		upload = int64(buffer.Len())
+	}
+	tt.manager.PushUploaded(upload)
+	tt.UploadTotal.Add(upload)
+	return
+}
+
 func (tt *tcpTracker) Close() error {
 	tt.manager.Leave(tt)
 	return tt.Conn.Close()
 }
 
+func (tt *tcpTracker) Upstream() any {
+	return tt.Conn
+}
+
 func NewTCPTracker(conn C.Conn, manager *Manager, metadata *C.Metadata, rule C.Rule) *tcpTracker {
 	uuid, _ := uuid.NewV4()
 	if conn != nil {
@@ -79,6 +107,8 @@ func NewTCPTracker(conn C.Conn, manager *Manager, metadata *C.Metadata, rule C.R
 			UploadTotal:   atomic.NewInt64(0),
 			DownloadTotal: atomic.NewInt64(0),
 		},
+		extendedReader: bufio.NewExtendedReader(conn),
+		extendedWriter: bufio.NewExtendedWriter(conn),
 	}
 
 	if rule != nil {