Add DNS action registration helper

action.go

@@ -26,6 +26,13 @@ type ActionDefinition struct {
 	Invoke func(map[string]any) (any, bool, error)
 }
 
+// ActionRegistrar accepts named DNS action handlers from a service.
+//
+//	service.RegisterActions(registrar)
+type ActionRegistrar interface {
+	RegisterAction(name string, invoke func(map[string]any) (any, bool, error))
+}
+
 // ActionDefinitions returns the complete DNS action surface in registration order.
 //
 //	service.ActionDefinitions()
@@ -132,6 +139,18 @@ func (service *Service) ActionNames() []string {
 	return names
 }
 
+// RegisterActions publishes the DNS action surface to a registrar in definition order.
+//
+//	service.RegisterActions(registrar)
+func (service *Service) RegisterActions(registrar ActionRegistrar) {
+	if registrar == nil {
+		return
+	}
+	for _, definition := range service.ActionDefinitions() {
+		registrar.RegisterAction(definition.Name, definition.Invoke)
+	}
+}
+
 // HandleAction executes a DNS action by name.
 //
 //	service.HandleAction("dns.resolve", map[string]any{"name": "gateway.charon.lthn"})

service_test.go

@@ -1063,6 +1063,41 @@ func TestServiceActionNamesExposeAllRFCActions(t *testing.T) {
 	}
 }
 
+func TestServiceRegisterActionsPublishesAllActionsInOrder(t *testing.T) {
+	service := NewService(ServiceOptions{
+		Records: map[string]NameRecords{
+			"gateway.charon.lthn": {
+				A: []string{"10.10.10.10"},
+			},
+		},
+	})
+
+	registrar := &actionRecorder{}
+	service.RegisterActions(registrar)
+
+	expected := service.ActionNames()
+	if len(registrar.names) != len(expected) {
+		t.Fatalf("expected %d registered actions, got %d: %#v", len(expected), len(registrar.names), registrar.names)
+	}
+	for index, name := range expected {
+		if registrar.names[index] != name {
+			t.Fatalf("unexpected registered action at %d: got %q want %q", index, registrar.names[index], name)
+		}
+	}
+
+	payload, ok, err := registrar.handlers[ActionResolve](map[string]any{"name": "gateway.charon.lthn"})
+	if err != nil {
+		t.Fatalf("unexpected registered handler error: %v", err)
+	}
+	if !ok {
+		t.Fatal("expected registered handler to resolve")
+	}
+	result, ok := payload.(ResolveAddressResult)
+	if !ok || len(result.Addresses) != 1 || result.Addresses[0] != "10.10.10.10" {
+		t.Fatalf("unexpected registered handler payload: %#v", payload)
+	}
+}
+
 func TestServiceActionDefinitionsHaveInvokers(t *testing.T) {
 	service := NewService(ServiceOptions{
 		Records: map[string]NameRecords{
@@ -1226,3 +1261,16 @@ func TestServiceHandleActionReverseHealthServeAndDiscover(t *testing.T) {
 		t.Fatalf("expected discover to refresh tree root, got %#v", discoverHealth["tree_root"])
 	}
 }
+
+type actionRecorder struct {
+	names    []string
+	handlers map[string]func(map[string]any) (any, bool, error)
+}
+
+func (recorder *actionRecorder) RegisterAction(name string, invoke func(map[string]any) (any, bool, error)) {
+	if recorder.handlers == nil {
+		recorder.handlers = map[string]func(map[string]any) (any, bool, error){}
+	}
+	recorder.names = append(recorder.names, name)
+	recorder.handlers[name] = invoke
+}