include feature gate in snapshotter

this commit includes feature gate method
to enable the volumeGroupSnapshot

Signed-off-by: yati1998 <[email protected]>

cmd/csi-snapshotter/main.go

@@ -31,6 +31,7 @@ import (
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	coreinformers "k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/kubernetes/scheme"
@@ -44,8 +45,10 @@ import (
 	"github.com/kubernetes-csi/csi-lib-utils/leaderelection"
 	"github.com/kubernetes-csi/csi-lib-utils/metrics"
 	csirpc "github.com/kubernetes-csi/csi-lib-utils/rpc"
+	"github.com/kubernetes-csi/external-snapshotter/v8/pkg/features"
 	controller "github.com/kubernetes-csi/external-snapshotter/v8/pkg/sidecar-controller"
 	"github.com/kubernetes-csi/external-snapshotter/v8/pkg/snapshotter"
+	utilflag "k8s.io/component-base/cli/flag"
 
 	clientset "github.com/kubernetes-csi/external-snapshotter/client/v8/clientset/versioned"
 	snapshotscheme "github.com/kubernetes-csi/external-snapshotter/client/v8/clientset/versioned/scheme"
@@ -90,6 +93,7 @@ var (
 
 	groupSnapshotNamePrefix     = flag.String("groupsnapshot-name-prefix", "groupsnapshot", "Prefix to apply to the name of a created group snapshot")
 	groupSnapshotNameUUIDLength = flag.Int("groupsnapshot-name-uuid-length", -1, "Length in characters for the generated uuid of a created group snapshot. Defaults behavior is to NOT truncate.")
+	featureGates                map[string]bool
 )
 
 var (
@@ -98,10 +102,17 @@ var (
 )
 
 func main() {
+	flag.Var(utilflag.NewMapStringBool(&featureGates), "feature-gates", "Comma-seprated list of key=value pairs that describe feature gates for alpha/experimental features. "+
+		"Options are:\n"+strings.Join(utilfeature.DefaultFeatureGate.KnownFeatures(), "\n"))
+
 	klog.InitFlags(nil)
 	flag.Set("logtostderr", "true")
 	flag.Parse()
 
+	if err := utilfeature.DefaultMutableFeatureGate.SetFromMap(featureGates); err != nil {
+		klog.Fatal("Error while parsing feature gates: ", err)
+	}
+
 	if *showVersion {
 		fmt.Println(os.Args[0], version)
 		os.Exit(0)
@@ -234,7 +245,7 @@ func main() {
 
 	snapShotter := snapshotter.NewSnapshotter(csiConn)
 	var groupSnapshotter group_snapshotter.GroupSnapshotter
-	if *enableVolumeGroupSnapshots {
+	if utilfeature.DefaultFeatureGate.Enabled(features.VolumeGroupSnapshot) {
 		tctx, cancel = context.WithTimeout(ctx, *csiTimeout)
 		defer cancel()
 		supportsCreateVolumeGroupSnapshot, err := supportsGroupControllerCreateVolumeGroupSnapshot(tctx, csiConn)
@@ -266,7 +277,7 @@ func main() {
 		*groupSnapshotNameUUIDLength,
 		*extraCreateMetadata,
 		workqueue.NewItemExponentialFailureRateLimiter(*retryIntervalStart, *retryIntervalMax),
-		*enableVolumeGroupSnapshots,
+		utilfeature.DefaultFeatureGate.Enabled(features.VolumeGroupSnapshot),
 		snapshotContentfactory.Groupsnapshot().V1alpha1().VolumeGroupSnapshotContents(),
 		snapshotContentfactory.Groupsnapshot().V1alpha1().VolumeGroupSnapshotClasses(),
 		workqueue.NewItemExponentialFailureRateLimiter(*retryIntervalStart, *retryIntervalMax),

cmd/snapshot-controller/main.go

@@ -25,6 +25,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"sync"
 	"time"
 
@@ -43,12 +44,15 @@ import (
 
 	"github.com/kubernetes-csi/csi-lib-utils/leaderelection"
 	controller "github.com/kubernetes-csi/external-snapshotter/v8/pkg/common-controller"
+	"github.com/kubernetes-csi/external-snapshotter/v8/pkg/features"
 	"github.com/kubernetes-csi/external-snapshotter/v8/pkg/metrics"
 
 	clientset "github.com/kubernetes-csi/external-snapshotter/client/v8/clientset/versioned"
 	snapshotscheme "github.com/kubernetes-csi/external-snapshotter/client/v8/clientset/versioned/scheme"
 	informers "github.com/kubernetes-csi/external-snapshotter/client/v8/informers/externalversions"
+	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	coreinformers "k8s.io/client-go/informers"
+	utilflag "k8s.io/component-base/cli/flag"
 )
 
 // Command line flags
@@ -76,6 +80,7 @@ var (
 	enableVolumeGroupSnapshots    = flag.Bool("enable-volume-group-snapshots", false, "Enables the volume group snapshot feature, allowing the user to create a snapshot of a group of volumes.")
 
 	retryCRDIntervalMax = flag.Duration("retry-crd-interval-max", 30*time.Second, "Maximum time to wait for CRDs to appear. The default is 30 seconds.")
+	featureGates        map[string]bool
 )
 
 var version = "unknown"
@@ -147,10 +152,17 @@ func ensureCustomResourceDefinitionsExist(client *clientset.Clientset, enableVol
 }
 
 func main() {
+	flag.Var(utilflag.NewMapStringBool(&featureGates), "feature-gates", "Comma-seprated list of key=value pairs that describe feature gates for alpha/experimental features. "+
+		"Options are:\n"+strings.Join(utilfeature.DefaultFeatureGate.KnownFeatures(), "\n"))
+
 	klog.InitFlags(nil)
 	flag.Set("logtostderr", "true")
 	flag.Parse()
 
+	if err := utilfeature.DefaultMutableFeatureGate.SetFromMap(featureGates); err != nil {
+		klog.Fatal("Error while parsing feature gates: ", err)
+	}
+
 	if *showVersion {
 		fmt.Println(os.Args[0], version)
 		os.Exit(0)
@@ -228,10 +240,10 @@ func main() {
 		workqueue.NewItemExponentialFailureRateLimiter(*retryIntervalStart, *retryIntervalMax),
 		*enableDistributedSnapshotting,
 		*preventVolumeModeConversion,
-		*enableVolumeGroupSnapshots,
+		utilfeature.DefaultFeatureGate.Enabled(features.VolumeGroupSnapshot),
 	)
 
-	if err := ensureCustomResourceDefinitionsExist(snapClient, *enableVolumeGroupSnapshots); err != nil {
+	if err := ensureCustomResourceDefinitionsExist(snapClient, utilfeature.DefaultFeatureGate.Enabled(features.VolumeGroupSnapshot)); err != nil {
 		klog.Errorf("Exiting due to failure to ensure CRDs exist during startup: %+v", err)
 		os.Exit(1)
 	}

go.mod

@@ -20,6 +20,7 @@ require (
 	google.golang.org/protobuf v1.35.1
 	k8s.io/api v0.31.0
 	k8s.io/apimachinery v0.31.0
+	k8s.io/apiserver v0.31.0
 	k8s.io/client-go v0.31.0
 	k8s.io/component-base v0.31.0
 	k8s.io/component-helpers v0.31.0

go.sum

@@ -197,6 +197,8 @@ k8s.io/api v0.31.0 h1:b9LiSjR2ym/SzTOlfMHm1tr7/21aD7fSkqgD/CVJBCo=
 k8s.io/api v0.31.0/go.mod h1:0YiFF+JfFxMM6+1hQei8FY8M7s1Mth+z/q7eF1aJkTE=
 k8s.io/apimachinery v0.31.0 h1:m9jOiSr3FoSSL5WO9bjm1n6B9KROYYgNZOb4tyZ1lBc=
 k8s.io/apimachinery v0.31.0/go.mod h1:rsPdaZJfTfLsNJSQzNHQvYoTmxhoOEofxtOsF3rtsMo=
+k8s.io/apiserver v0.31.0 h1:p+2dgJjy+bk+B1Csz+mc2wl5gHwvNkC9QJV+w55LVrY=
+k8s.io/apiserver v0.31.0/go.mod h1:KI9ox5Yu902iBnnyMmy7ajonhKnkeZYJhTZ/YI+WEMk=
 k8s.io/client-go v0.31.0 h1:QqEJzNjbN2Yv1H79SsS+SWnXkBgVu4Pj3CJQgbx0gI8=
 k8s.io/client-go v0.31.0/go.mod h1:Y9wvC76g4fLjmU0BA+rV+h2cncoadjvjjkkIGoTLcGU=
 k8s.io/component-base v0.31.0 h1:/KIzGM5EvPNQcYgwq5NwoQBaOlVFrghoVGr8lG6vNRs=

pkg/features/features.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2024 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package features
+
+import (
+	"k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/component-base/featuregate"
+)
+
+const (
+	// Enable usage of volume group snapshot
+	VolumeGroupSnapshot featuregate.Feature = "CSIVolumeGroupSnapshot"
+)
+
+func init() {
+	feature.DefaultMutableFeatureGate.Add(defaultKubernetesFeatureGates)
+}
+
+// defaultKubernetesFeatureGates consists of all known feature keys specific to external-snapshotter.
+// To add a new feature, define a key for it above and add it here.
+var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{
+	VolumeGroupSnapshot: {Default: false, PreRelease: featuregate.Beta},
+}