chore: slowdown wireguard dial retry

adapter/outbound/wireguard.go

@@ -12,7 +12,9 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 
+	"github.com/metacubex/mihomo/common/atomic"
 	CN "github.com/metacubex/mihomo/common/net"
 	"github.com/metacubex/mihomo/component/dialer"
 	"github.com/metacubex/mihomo/component/proxydialer"
@@ -23,6 +25,8 @@ import (
 
 	wireguard "github.com/metacubex/sing-wireguard"
 
+	"github.com/jpillora/backoff"
+
 	"github.com/sagernet/sing/common"
 	"github.com/sagernet/sing/common/debug"
 	E "github.com/sagernet/sing/common/exceptions"
@@ -125,6 +129,48 @@ func (option WireGuardPeerOption) Prefixes() ([]netip.Prefix, error) {
 	return localPrefixes, nil
 }
 
+type wgSingDialer struct {
+	proxydialer.SingDialer
+	errTimes atomic.Int64
+	backoff  *backoff.Backoff
+}
+
+func (d *wgSingDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
+	if d.errTimes.Load() > 10 {
+		select {
+		case <-time.After(d.backoff.Duration()):
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
+	c, err := d.SingDialer.DialContext(ctx, network, destination)
+	if err != nil {
+		d.errTimes.Add(1)
+		return nil, err
+	}
+	d.errTimes.Store(0)
+	d.backoff.Reset()
+	return c, nil
+}
+
+func (d *wgSingDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
+	if d.errTimes.Load() > 10 {
+		select {
+		case <-time.After(d.backoff.Duration()):
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
+	c, err := d.SingDialer.ListenPacket(ctx, destination)
+	if err != nil {
+		d.errTimes.Add(1)
+		return nil, err
+	}
+	d.errTimes.Store(0)
+	d.backoff.Reset()
+	return c, nil
+}
+
 func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 	outbound := &WireGuard{
 		Base: &Base{
@@ -136,7 +182,16 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 			rmark:  option.RoutingMark,
 			prefer: C.NewDNSPrefer(option.IPVersion),
 		},
-		dialer: proxydialer.NewByNameSingDialer(option.DialerProxy, dialer.NewDialer()),
+		dialer: &wgSingDialer{
+			SingDialer: proxydialer.NewByNameSingDialer(option.DialerProxy, dialer.NewDialer()),
+			errTimes:   atomic.NewInt64(0),
+			backoff: &backoff.Backoff{
+				Min:    10 * time.Millisecond,
+				Max:    1 * time.Second,
+				Factor: 2,
+				Jitter: true,
+			},
+		},
 	}
 	runtime.SetFinalizer(outbound, closeWireGuard)