1 /* 2 Copyright 2018 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package checksum 18 19 import ( 20 "hash/fnv" 21 22 "k8s.io/kubernetes/pkg/kubelet/checkpointmanager/errors" 23 hashutil "k8s.io/kubernetes/pkg/util/hash" 24 ) 25 26 // Checksum is the data to be stored as checkpoint 27 type Checksum uint64 28 29 // Verify verifies that passed checksum is same as calculated checksum 30 func (cs Checksum) Verify(data interface{}) error { 31 if cs != New(data) { 32 return errors.ErrCorruptCheckpoint 33 } 34 return nil 35 } 36 37 // New returns the Checksum of checkpoint data 38 func New(data interface{}) Checksum { 39 return Checksum(getChecksum(data)) 40 } 41 42 // Get returns calculated checksum of checkpoint data 43 func getChecksum(data interface{}) uint64 { 44 hash := fnv.New32a() 45 hashutil.DeepHashObject(hash, data) 46 return uint64(hash.Sum32()) 47 } 48