// polynomial. The table is suitable for use with the simple algorithm
// (simpleUpdate).
func simpleMakeTable(poly uint32) *Table {
	t := new(Table)
	simplePopulateTable(poly, t)
	return t
}

// simplePopulateTable constructs a Table for the specified polynomial, suitable
// for use with simpleUpdate.
func simplePopulateTable(poly uint32, t *Table) {
	for i := 0; i < 256; i++ {
		crc := uint32(i)

func (e *Etcd) tryUpdate(fn func() error) error {
	err := e.storage.GuaranteedUpdate(context.TODO(), e.baseKey, &api.RangeAllocation{}, true, nil,
		storage.SimpleUpdate(func(input runtime.Object) (output runtime.Object, err error) {
			existing := input.(*api.RangeAllocation)
			if len(existing.ResourceVersion) == 0 {

	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
)

type SimpleUpdateFunc func(runtime.Object) (runtime.Object, error)

// SimpleUpdateFunc converts SimpleUpdateFunc into UpdateFunc
func SimpleUpdate(fn SimpleUpdateFunc) UpdateFunc {
	return func(input runtime.Object, _ ResponseMeta) (runtime.Object, *uint64, error) {
		out, err := fn(input)
		return out, nil, err
	}
}

func TestSimple(t *testing.T) {
	tab := simpleMakeTable(IEEE)
	testGoldenIEEE(t, func(b []byte) uint32 {
		return simpleUpdate(0, tab, b)
	})

	tab = simpleMakeTable(Castagnoli)
	testGoldenCastagnoli(t, func(b []byte) uint32 {
		return simpleUpdate(0, tab, b)
	})
}

func TestGoldenMarshal(t *testing.T) {
	t.Run("IEEE", func(t *testing.T) {
		for _, g := range golden {

	// passed originalPod, and make sure that SimpleUpdate is called a second time after a live lookup
	// with the value of updatedPod.
	sawConflict := false
	updatedPod2 := &example.Pod{}
	err = store.GuaranteedUpdate(ctx, key, updatedPod2, false, nil,
		storage.SimpleUpdate(func(obj runtime.Object) (runtime.Object, error) {
			pod := obj.(*example.Pod)

			// that its corresponding event will not be propagated.
			badKey := fmt.Sprintf("/pods/%s-bad/foo", tt.namespace)
			badOut := &example.Pod{}
			err = store.GuaranteedUpdate(ctx, badKey, badOut, true, nil, storage.SimpleUpdate(
				func(runtime.Object) (runtime.Object, error) {
					obj := basePod.DeepCopy()
					obj.Namespace = fmt.Sprintf("%s-bad", tt.namespace)
					return obj, nil
				}), nil)
			if err != nil {

		return updateCastagnoli(crc, p)
	case tab == IEEETable:
		if checkInitIEEE {
			ieeeOnce.Do(ieeeInit)
		}
		return updateIEEE(crc, p)
	default:
		return simpleUpdate(crc, tab, p)
	}
}

// Update returns the result of adding the bytes in p to the crc.
func Update(crc uint32, tab *Table, p []byte) uint32 {

	lastGraceful := int64(0)
	var pendingFinalizers bool
	out = e.NewFunc()
	err = e.Storage.GuaranteedUpdate(
		ctx,
		key,
		out,
		false, /* ignoreNotFound */
		&preconditions,
		storage.SimpleUpdate(func(existing runtime.Object) (runtime.Object, error) {
			if err := deleteValidation(ctx, existing); err != nil {
				return nil, err
			}