add feature gate for search and proxy

Signed-off-by: yingjinhui <yingjinhui@didiglobal.com>

cmd/karmada-search/app/options/options.go

@@ -47,6 +47,9 @@ type Options struct {
 	KubeAPIBurst int
 
 	ProfileOpts profileflag.Options
+
+	DisableSearch bool
+	DisableProxy  bool
 }
 
 // NewOptions returns a new Options.
@@ -69,6 +72,8 @@ func (o *Options) AddFlags(flags *pflag.FlagSet) {
 
 	flags.Float32Var(&o.KubeAPIQPS, "kube-api-qps", 40.0, "QPS to use while talking with karmada-apiserver. Doesn't cover events and node heartbeat apis which rate limiting is controlled by a different set of flags.")
 	flags.IntVar(&o.KubeAPIBurst, "kube-api-burst", 60, "Burst to use while talking with karmada-apiserver. Doesn't cover events and node heartbeat apis which rate limiting is controlled by a different set of flags.")
+	flags.BoolVar(&o.DisableSearch, "disable-search", false, "Disable search feature that would save memory usage significantly.")
+	flags.BoolVar(&o.DisableProxy, "disable-proxy", false, "Disable proxy feature that would save memory usage significantly.")
 
 	utilfeature.DefaultMutableFeatureGate.AddFlag(flags)
 	o.ProfileOpts.AddFlags(flags)
@@ -101,25 +106,29 @@ func (o *Options) Run(ctx context.Context) error {
 	})
 
 	server.GenericAPIServer.AddPostStartHookOrDie("start-karmada-informers", func(context genericapiserver.PostStartHookContext) error {
-		config.KarmadaSharedInformerFactory.Start(context.StopCh)
+		config.ExtraConfig.KarmadaSharedInformerFactory.Start(context.StopCh)
 		return nil
 	})
 
-	server.GenericAPIServer.AddPostStartHookOrDie("start-karmada-search-controller", func(context genericapiserver.PostStartHookContext) error {
+	if config.ExtraConfig.Controller != nil {
-		// start ResourceRegistry controller
+		server.GenericAPIServer.AddPostStartHookOrDie("start-karmada-search-controller", func(context genericapiserver.PostStartHookContext) error {
-		config.Controller.Start(context.StopCh)
+			// start ResourceRegistry controller
-		return nil
+			config.ExtraConfig.Controller.Start(context.StopCh)
-	})
+			return nil
+		})
+	}
 
-	server.GenericAPIServer.AddPostStartHookOrDie("start-karmada-proxy-controller", func(context genericapiserver.PostStartHookContext) error {
+	if config.ExtraConfig.ProxyController != nil {
-		config.ProxyController.Start(context.StopCh)
+		server.GenericAPIServer.AddPostStartHookOrDie("start-karmada-proxy-controller", func(context genericapiserver.PostStartHookContext) error {
-		return nil
+			config.ExtraConfig.ProxyController.Start(context.StopCh)
-	})
+			return nil
+		})
 
-	server.GenericAPIServer.AddPreShutdownHookOrDie("stop-karmada-proxy-controller", func() error {
+		server.GenericAPIServer.AddPreShutdownHookOrDie("stop-karmada-proxy-controller", func() error {
-		config.ProxyController.Stop()
+			config.ExtraConfig.ProxyController.Stop()
-		return nil
+			return nil
-	})
+		})
+	}
 
 	return server.GenericAPIServer.PrepareRun().Run(ctx.Done())
 }
@@ -152,25 +161,33 @@ func (o *Options) Config() (*search.Config, error) {
 		return nil, err
 	}
 
-	ctl, err := search.NewController(serverConfig.ClientConfig)
-	if err != nil {
-		return nil, err
-	}
-
 	karmadaClient := karmadaclientset.NewForConfigOrDie(serverConfig.ClientConfig)
 	factory := informerfactory.NewSharedInformerFactory(karmadaClient, 0)
 
-	proxyCtl, err := proxy.NewController(serverConfig.ClientConfig, restMapper, serverConfig.SharedInformerFactory, factory,
+	var ctl *search.Controller
-		time.Second*time.Duration(serverConfig.Config.MinRequestTimeout))
+	if !o.DisableSearch {
-	if err != nil {
+		ctl, err = search.NewController(serverConfig.ClientConfig, factory, restMapper)
-		return nil, err
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	var proxyCtl *proxy.Controller
+	if !o.DisableProxy {
+		proxyCtl, err = proxy.NewController(serverConfig.ClientConfig, restMapper, serverConfig.SharedInformerFactory, factory,
+			time.Second*time.Duration(serverConfig.Config.MinRequestTimeout))
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	config := &search.Config{
-		GenericConfig:                serverConfig,
+		GenericConfig: serverConfig,
-		Controller:                   ctl,
+		ExtraConfig: search.ExtraConfig{
-		ProxyController:              proxyCtl,
+			KarmadaSharedInformerFactory: factory,
-		KarmadaSharedInformerFactory: factory,
+			Controller:                   ctl,
+			ProxyController:              proxyCtl,
+		},
 	}
 	return config, nil
 }

pkg/search/apiserver.go

@@ -9,27 +9,22 @@ import (
 	searchapis "github.com/karmada-io/karmada/pkg/apis/search"
 	searchscheme "github.com/karmada-io/karmada/pkg/apis/search/scheme"
 	informerfactory "github.com/karmada-io/karmada/pkg/generated/informers/externalversions"
-	clusterlister "github.com/karmada-io/karmada/pkg/generated/listers/cluster/v1alpha1"
 	searchstorage "github.com/karmada-io/karmada/pkg/registry/search/storage"
 	"github.com/karmada-io/karmada/pkg/search/proxy"
-	"github.com/karmada-io/karmada/pkg/util/fedinformer/genericmanager"
 )
 
 // ExtraConfig holds custom apiserver config
 type ExtraConfig struct {
-	MultiClusterInformerManager  genericmanager.MultiClusterInformerManager
-	ClusterLister                clusterlister.ClusterLister
 	KarmadaSharedInformerFactory informerfactory.SharedInformerFactory
+	Controller                   *Controller
 	ProxyController              *proxy.Controller
 	// Add custom config if necessary.
 }
 
 // Config defines the config for the APIServer.
 type Config struct {
-	GenericConfig                *genericapiserver.RecommendedConfig
+	GenericConfig *genericapiserver.RecommendedConfig
-	Controller                   *Controller
+	ExtraConfig   ExtraConfig
-	ProxyController              *proxy.Controller
-	KarmadaSharedInformerFactory informerfactory.SharedInformerFactory
 }
 
 // APIServer contains state for karmada-search.
@@ -51,12 +46,7 @@ type CompletedConfig struct {
 func (cfg *Config) Complete() CompletedConfig {
 	c := completedConfig{
 		cfg.GenericConfig.Complete(),
-		&ExtraConfig{
+		&cfg.ExtraConfig,
-			MultiClusterInformerManager:  cfg.Controller.InformerManager,
-			ClusterLister:                cfg.Controller.clusterLister,
-			KarmadaSharedInformerFactory: cfg.KarmadaSharedInformerFactory,
-			ProxyController:              cfg.ProxyController,
-		},
 	}
 
 	c.GenericConfig.Version = &version.Info{
@@ -84,14 +74,21 @@ func (c completedConfig) New() (*APIServer, error) {
 		klog.Errorf("unable to create REST storage for a resource due to %v, will die", err)
 		return nil, err
 	}
-	searchREST := searchstorage.NewSearchREST(c.ExtraConfig.MultiClusterInformerManager, c.ExtraConfig.ClusterLister)
-	proxyingREST := searchstorage.NewProxyingREST(c.ExtraConfig.ProxyController)
 
 	v1alpha1search := map[string]rest.Storage{}
 	v1alpha1search["resourceregistries"] = resourceRegistryStorage.ResourceRegistry
 	v1alpha1search["resourceregistries/status"] = resourceRegistryStorage.Status
-	v1alpha1search["search"] = searchREST
+
-	v1alpha1search["proxying"] = proxyingREST
+	if c.ExtraConfig.Controller != nil {
+		searchREST := searchstorage.NewSearchREST(c.ExtraConfig.Controller.InformerManager, c.ExtraConfig.Controller.clusterLister)
+		v1alpha1search["search"] = searchREST
+	}
+
+	if c.ExtraConfig.ProxyController != nil {
+		proxyingREST := searchstorage.NewProxyingREST(c.ExtraConfig.ProxyController)
+		v1alpha1search["proxying"] = proxyingREST
+	}
+
 	apiGroupInfo.VersionedResourcesStorageMap["v1alpha1"] = v1alpha1search
 
 	if err = server.GenericAPIServer.InstallAPIGroup(&apiGroupInfo); err != nil {

pkg/search/controller.go

@@ -21,7 +21,6 @@ import (
 	clusterV1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
 	policyv1alpha1 "github.com/karmada-io/karmada/pkg/apis/policy/v1alpha1"
 	searchv1alpha1 "github.com/karmada-io/karmada/pkg/apis/search/v1alpha1"
-	karmadaclientset "github.com/karmada-io/karmada/pkg/generated/clientset/versioned"
 	informerfactory "github.com/karmada-io/karmada/pkg/generated/informers/externalversions"
 	clusterlister "github.com/karmada-io/karmada/pkg/generated/listers/cluster/v1alpha1"
 	"github.com/karmada-io/karmada/pkg/search/backendstore"
@@ -57,16 +56,8 @@ type Controller struct {
 }
 
 // NewController returns a new ResourceRegistry controller
-func NewController(restConfig *rest.Config) (*Controller, error) {
+func NewController(restConfig *rest.Config, factory informerfactory.SharedInformerFactory, restMapper meta.RESTMapper) (*Controller, error) {
-	karmadaClient := karmadaclientset.NewForConfigOrDie(restConfig)
-	factory := informerfactory.NewSharedInformerFactory(karmadaClient, 0)
 	clusterLister := factory.Cluster().V1alpha1().Clusters().Lister()
-	restMapper, err := restmapper.MapperProvider(restConfig)
-	if err != nil {
-		klog.Errorf("Failed to create REST mapper: %v", err)
-		return nil, err
-	}
-
 	queue := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
 
 	c := &Controller{
@@ -115,7 +106,6 @@ func (c *Controller) Start(stopCh <-chan struct{}) {
 
 	defer runtime.HandleCrash()
 
-	c.informerFactory.Start(stopCh)
 	c.informerFactory.WaitForCacheSync(stopCh)
 
 	go wait.Until(c.worker, time.Second, stopCh)