Add "snapshot-count" annotation for volumesnapshotClass

Signed-off-by: f10atin9 <f10atin9@kubesphere.io>

pkg/models/resources/v1alpha3/volumesnapshotclass/volumesnapshotclass.go

@@ -17,8 +17,11 @@ limitations under the License.
 package volumesnapshotclass
 
 import (
+	"strconv"
 	"strings"
 
+	"k8s.io/apimachinery/pkg/labels"
+
 	v1 "github.com/kubernetes-csi/external-snapshotter/client/v4/apis/volumesnapshot/v1"
 	"github.com/kubernetes-csi/external-snapshotter/client/v4/informers/externalversions"
 	"k8s.io/apimachinery/pkg/runtime"
@@ -53,6 +56,11 @@ func (v *volumeSnapshotClassGetter) List(namespace string, query *query.Query) (
 
 	var result []runtime.Object
 	for _, snapshotClass := range all {
+		count := v.countVolumeSnapshots(snapshotClass.Name)
+		if snapshotClass.Annotations == nil {
+			snapshotClass.Annotations = make(map[string]string)
+		}
+		snapshotClass.Annotations["kubesphere.io/snapshot-count"] = strconv.Itoa(count)
 		result = append(result, snapshotClass)
 	}
 
@@ -86,3 +94,18 @@ func (v *volumeSnapshotClassGetter) filter(object runtime.Object, filter query.F
 		return v1alpha3.DefaultObjectMetaFilter(snapshotClass.ObjectMeta, filter)
 	}
 }
+
+func (v *volumeSnapshotClassGetter) countVolumeSnapshots(name string) int {
+	snapshots, err := v.informers.Snapshot().V1().VolumeSnapshots().Lister().VolumeSnapshots("").List(labels.Everything())
+	if err != nil {
+		return 0
+	}
+	var count int
+
+	for _, snapshot := range snapshots {
+		if snapshot.Spec.VolumeSnapshotClassName != nil && *snapshot.Spec.VolumeSnapshotClassName == name {
+			count++
+		}
+	}
+	return count
+}