49 lines
1.6 KiB
Go
49 lines
1.6 KiB
Go
// Copyright 2022 The KubeSphere Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"fmt"
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"hash"
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"hash/fnv"
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"github.com/davecgh/go-spew/spew"
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"k8s.io/apimachinery/pkg/util/rand"
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)
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// ComputeHash computes hash value of a interface
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func ComputeHash(obj interface{}) string {
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hasher := fnv.New32a()
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deepHashObject(hasher, obj)
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return rand.SafeEncodeString(fmt.Sprint(hasher.Sum32()))
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}
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// deepHashObject writes specified object to hash using the spew library
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// which follows pointers and prints actual values of the nested objects
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// ensuring the hash does not change when a pointer changes.
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// **Notice**
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// we don't want to import k8s.io/kubernetes as a module, but this is a very small function
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// so just copy it from k8s.io/kubernetes@v1.14.0/pkg/util/hash/hash.go
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// **Notice End**
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func deepHashObject(hasher hash.Hash, objectToWrite interface{}) {
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hasher.Reset()
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printer := spew.ConfigState{
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Indent: " ",
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SortKeys: true,
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DisableMethods: true,
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SpewKeys: true,
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}
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printer.Fprintf(hasher, "%#v", objectToWrite)
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}
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