36 lines
997 B
Go
36 lines
997 B
Go
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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