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lists.go
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lists.go
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// Copyright 2023 Google LLC
//
// 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 kinds
import (
"fmt"
"strings"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// ListSuffix is the suffix expected for all Kubernetes collection resources.
const ListSuffix = "List"
// IsListGVK returns true if the kind has a "List" suffix.
func IsListGVK(gvk schema.GroupVersionKind) bool {
return strings.HasSuffix(gvk.Kind, ListSuffix)
}
// ListGVKForItemGVK returns the item GroupVersionKind with "List" appended to
// the kind.
func ListGVKForItemGVK(gvk schema.GroupVersionKind) schema.GroupVersionKind {
gvk.Kind += ListSuffix
return gvk
}
// ItemGVKForListGVK returns the list GroupVersionKind with "List" removed from
// the suffix of the kind.
func ItemGVKForListGVK(gvk schema.GroupVersionKind) schema.GroupVersionKind {
gvk.Kind = strings.TrimSuffix(gvk.Kind, ListSuffix)
return gvk
}
// NewTypedListForItemGVK creates a new client.ObjectList using the list type
// registered to the scheme for the specified item GroupVersionKind with "List"
// appended to the kind.
func NewTypedListForItemGVK(itemGVK schema.GroupVersionKind, scheme *runtime.Scheme) (client.ObjectList, error) {
rObj, err := NewObjectForGVK(ListGVKForItemGVK(itemGVK), scheme)
if err != nil {
return nil, err
}
return ObjectAsClientObjectList(rObj)
}
// NewUnstructuredListForItemGVK creates a new UnstructuredList using the
// specified item GroupVersionKind with "List" appended to the kind.
func NewUnstructuredListForItemGVK(itemGVK schema.GroupVersionKind) *unstructured.UnstructuredList {
uList := &unstructured.UnstructuredList{}
uList.SetGroupVersionKind(ListGVKForItemGVK(itemGVK))
return uList
}
// ExtractClientObjectList reads the Items from a client.ObjectList into a
// []client.Object.
func ExtractClientObjectList(objList client.ObjectList) ([]client.Object, error) {
items, err := meta.ExtractList(objList)
if err != nil {
return nil, fmt.Errorf("unsupported resource list type (%s)",
ObjectSummary(objList))
}
cObjList := make([]client.Object, len(items))
for i := range items {
cObj, err := ObjectAsClientObject(items[i])
if err != nil {
return nil, fmt.Errorf("invalid resource list item[%d]: %w", i, err)
}
cObjList[i] = cObj
}
return cObjList, nil
}