chore: better tuic conn close

adapter/outbound/tuic.go

@@ -9,6 +9,7 @@ import (
 	"fmt"
 	"net"
 	"os"
+	"runtime"
 	"strconv"
 	"sync"
 	"time"
@@ -199,6 +200,7 @@ func NewTuic(option TuicOption) (*Tuic, error) {
 			RequestTimeout:       option.RequestTimeout,
 		}
 		clientMap[o] = client
+		runtime.SetFinalizer(client, closeTuicClient)
 		return client
 	}
 
@@ -214,3 +216,7 @@ func NewTuic(option TuicOption) (*Tuic, error) {
 		getClient: getClient,
 	}, nil
 }
+
+func closeTuicClient(client *tuic.Client) {
+	client.Close(nil)
+}

transport/tuic/client.go

@@ -197,18 +197,26 @@ func (t *Client) deferQuicConn(quicConn quic.Connection, err error) {
 		t.connMutex.Lock()
 		defer t.connMutex.Unlock()
 		if t.quicConn == quicConn {
-			t.udpInputMap.Range(func(key, value any) bool {
+			t.Close(err)
-				if conn, ok := value.(net.Conn); ok {
-					_ = conn.Close()
-				}
-				return true
-			})
-			t.udpInputMap = sync.Map{} // new one
-			t.quicConn = nil
 		}
 	}
 }
 
+func (t *Client) Close(err error) {
+	quicConn := t.quicConn
+	if quicConn != nil {
+		_ = t.quicConn.CloseWithError(ProtocolError, err.Error())
+		t.udpInputMap.Range(func(key, value any) bool {
+			if conn, ok := value.(net.Conn); ok {
+				_ = conn.Close()
+			}
+			return true
+		})
+		t.udpInputMap = sync.Map{} // new one
+		t.quicConn = nil
+	}
+}
+
 func (t *Client) DialContext(ctx context.Context, metadata *C.Metadata, dialFn func(ctx context.Context) (net.PacketConn, net.Addr, error)) (net.Conn, error) {
 	quicConn, err := t.getQuicConn(ctx, dialFn)
 	if err != nil {
@@ -237,7 +245,7 @@ func (t *Client) DialContext(ctx context.Context, metadata *C.Metadata, dialFn f
 	if t.RequestTimeout > 0 {
 		_ = stream.SetReadDeadline(time.Now().Add(time.Duration(t.RequestTimeout) * time.Millisecond))
 	}
-	conn := N.NewBufferedConn(&quicStreamConn{stream, quicConn.LocalAddr(), quicConn.RemoteAddr()})
+	conn := N.NewBufferedConn(&quicStreamConn{stream, quicConn.LocalAddr(), quicConn.RemoteAddr(), t})
 	response, err := ReadResponse(conn)
 	if err != nil {
 		return nil, err
@@ -252,8 +260,9 @@ func (t *Client) DialContext(ctx context.Context, metadata *C.Metadata, dialFn f
 
 type quicStreamConn struct {
 	quic.Stream
-	lAddr net.Addr
+	lAddr  net.Addr
-	rAddr net.Addr
+	rAddr  net.Addr
+	client *Client
 }
 
 func (q *quicStreamConn) LocalAddr() net.Addr {