/
hash.go
35 lines (31 loc) · 1003 Bytes
/
hash.go
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package controllers
import (
"fmt"
"hash"
"hash/fnv"
"github.com/davecgh/go-spew/spew"
"k8s.io/apimachinery/pkg/util/rand"
)
// ComputeHash computes hash value of a interface
func ComputeHash(obj interface{}) string {
hasher := fnv.New32a()
deepHashObject(hasher, obj)
return rand.SafeEncodeString(fmt.Sprint(hasher.Sum32()))
}
// deepHashObject writes specified object to hash using the spew library
// which follows pointers and prints actual values of the nested objects
// ensuring the hash does not change when a pointer changes.
// **Notice**
// we don't want to import k8s.io/kubernetes as a module, but this is a very small function
// so just copy it from k8s.io/kubernetes@v1.14.0/pkg/util/hash/hash.go
// **Notice End**
func deepHashObject(hasher hash.Hash, objectToWrite interface{}) {
hasher.Reset()
printer := spew.ConfigState{
Indent: " ",
SortKeys: true,
DisableMethods: true,
SpewKeys: true,
}
printer.Fprintf(hasher, "%#v", objectToWrite)
}