close inner features before resetting

dns.go

@@ -52,6 +52,8 @@ func (d *syncDNSClient) Set(client DNSClient) {
 		return
 	}
 
+	d.Close()
+
 	d.Lock()
 	defer d.Unlock()
 

network.go

@@ -84,6 +84,12 @@ func (m *syncInboundHandlerManager) Close() error {
 }
 
 func (m *syncInboundHandlerManager) Set(manager InboundHandlerManager) {
+	if manager == nil {
+		return
+	}
+
+	m.Close()
+
 	m.Lock()
 	defer m.Unlock()
 
@@ -161,6 +167,11 @@ func (m *syncOutboundHandlerManager) Close() error {
 }
 
 func (m *syncOutboundHandlerManager) Set(manager OutboundHandlerManager) {
+	if manager == nil {
+		return
+	}
+
+	m.Close()
 	m.Lock()
 	defer m.Unlock()
 

policy.go

@@ -87,6 +87,8 @@ func (m *syncPolicyManager) Set(manager PolicyManager) {
 		return
 	}
 
+	m.Close()
+
 	m.Lock()
 	defer m.Unlock()
 

router.go

@@ -54,6 +54,11 @@ func (d *syncDispatcher) Close() error {
 }
 
 func (d *syncDispatcher) Set(disp Dispatcher) {
+	if disp == nil {
+		return
+	}
+
+	d.Close()
 	d.Lock()
 	defer d.Unlock()
 
@@ -108,6 +113,11 @@ func (r *syncRouter) Close() error {
 }
 
 func (r *syncRouter) Set(router Router) {
+	if router == nil {
+		return
+	}
+
+	r.Close()
 	r.Lock()
 	defer r.Unlock()