chore: better atomic using

dns/client.go

@@ -23,7 +23,7 @@ type client struct {
 	r            *Resolver
 	port         string
 	host         string
-	iface        *atomic.TypedValue[string]
+	iface        atomic.TypedValue[string]
 	proxyAdapter C.ProxyAdapter
 	proxyName    string
 	addr         string
@@ -77,8 +77,8 @@ func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (*D.Msg, error)
 		network = "tcp"
 	}
 
-	options := []dialer.Option{}
-	if c.iface != nil && c.iface.Load() != "" {
+	var options []dialer.Option
+	if c.iface.Load() != "" {
 		options = append(options, dialer.WithInterface(c.iface.Load()))
 	}
 

dns/resolver.go

@@ -398,7 +398,7 @@ func (r *Resolver) Invalid() bool {
 type NameServer struct {
 	Net          string
 	Addr         string
-	Interface    *atomic.TypedValue[string]
+	Interface    atomic.TypedValue[string]
 	ProxyAdapter C.ProxyAdapter
 	ProxyName    string
 	Params       map[string]string