/
hash.go
72 lines (61 loc) · 1.92 KB
/
hash.go
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/* SPDX-License-Identifier: Apache-2.0
*
* Copyright 2023 Damian Peckett <damian@pecke.tt>.
*
* 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 updater
import (
"encoding/hex"
"hash/fnv"
"io"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/dump"
)
const (
// AnnotationKey is the key used to store the hash of the template object.
AnnotationKey = "gpu-ninja.com/template-hash"
)
func GetHash(obj runtime.Object) (string, error) {
metaObj, err := meta.Accessor(obj)
if err != nil {
return "", err
}
annotations := metaObj.GetAnnotations()
if annotations == nil {
return "", nil
}
return annotations[AnnotationKey], nil
}
func StoreHash(obj runtime.Object, hash string) error {
metaObj, err := meta.Accessor(obj)
if err != nil {
return err
}
annotations := metaObj.GetAnnotations()
if annotations == nil {
annotations = make(map[string]string)
}
annotations[AnnotationKey] = hash
metaObj.SetAnnotations(annotations)
return nil
}
// HashObject returns a hash of the given object.
// This is inspired by the way Kubernetes manages controller revisions in StatefulSets:
// https://github.com/kubernetes/kubernetes/blob/ee265c92fec40cd69d1de010b477717e4c142492/pkg/controller/history/controller_history.go#L92
func HashObject(obj runtime.Object) string {
h := fnv.New32a()
_, _ = io.WriteString(h, dump.ForHash(obj))
return hex.EncodeToString(h.Sum(nil))
}