Unstructured cleanups

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured/helpers.go

@@ -138,35 +138,40 @@ func NestedSlice(obj map[string]interface{}, fields ...string) ([]interface{}, b
 // NestedStringMap returns a copy of map[string]string value of a nested field.
 // Returns false if value is not found, is not a map[string]interface{} or contains non-string values in the map.
 func NestedStringMap(obj map[string]interface{}, fields ...string) (map[string]string, bool) {
-	val, ok := nestedFieldNoCopy(obj, fields...)
+	m, ok := nestedMapNoCopy(obj, fields...)
 	if !ok {
 		return nil, false
 	}
-	if m, ok := val.(map[string]interface{}); ok {
-		strMap := make(map[string]string, len(m))
-		for k, v := range m {
-			if str, ok := v.(string); ok {
-				strMap[k] = str
-			} else {
-				return nil, false
-			}
+	strMap := make(map[string]string, len(m))
+	for k, v := range m {
+		if str, ok := v.(string); ok {
+			strMap[k] = str
+		} else {
+			return nil, false
 		}
-		return strMap, true
 	}
-	return nil, false
+	return strMap, true
 }
 
 // NestedMap returns a deep copy of map[string]interface{} value of a nested field.
 // Returns false if value is not found or is not a map[string]interface{}.
 func NestedMap(obj map[string]interface{}, fields ...string) (map[string]interface{}, bool) {
-	val, ok := nestedFieldNoCopy(obj, fields...)
+	m, ok := nestedMapNoCopy(obj, fields...)
 	if !ok {
 		return nil, false
 	}
-	if m, ok := val.(map[string]interface{}); ok {
-		return runtime.DeepCopyJSON(m), true
+	return runtime.DeepCopyJSON(m), true
+}
+
+// nestedMapNoCopy returns a map[string]interface{} value of a nested field.
+// Returns false if value is not found or is not a map[string]interface{}.
+func nestedMapNoCopy(obj map[string]interface{}, fields ...string) (map[string]interface{}, bool) {
+	val, ok := nestedFieldNoCopy(obj, fields...)
+	if !ok {
+		return nil, false
 	}
-	return nil, false
+	m, ok := val.(map[string]interface{})
+	return m, ok
 }
 
 // SetNestedField sets the value of a nested field to a deep copy of the value provided.
@@ -268,25 +273,6 @@ func extractOwnerReference(v map[string]interface{}) metav1.OwnerReference {
 	}
 }
 
-func setOwnerReference(src metav1.OwnerReference) map[string]interface{} {
-	ret := map[string]interface{}{
-		"kind":       src.Kind,
-		"name":       src.Name,
-		"apiVersion": src.APIVersion,
-		"uid":        string(src.UID),
-	}
-	// json.Unmarshal() extracts boolean json fields as bool, not as *bool and hence extractOwnerReference()
-	// expects bool or a missing field, not *bool. So if pointer is nil, fields are omitted from the ret object.
-	// If pointer is non-nil, they are set to the referenced value.
-	if src.Controller != nil {
-		ret["controller"] = *src.Controller
-	}
-	if src.BlockOwnerDeletion != nil {
-		ret["blockOwnerDeletion"] = *src.BlockOwnerDeletion
-	}
-	return ret
-}
-
 // UnstructuredJSONScheme is capable of converting JSON data into the Unstructured
 // type, which can be used for generic access to objects without a predefined scheme.
 // TODO: move into serializer/json.
@@ -444,7 +430,7 @@ func (UnstructuredObjectConverter) Convert(in, out, context interface{}) error {
 
 	// maybe deep copy the map? It is documented in the
 	// ObjectConverter interface that this function is not
-	// guaranteeed to not mutate the input. Or maybe set the input
+	// guaranteed to not mutate the input. Or maybe set the input
 	// object to nil.
 	unstructOut.Object = unstructIn.Object
 	return nil

staging/src/k8s.io/apimachinery/pkg/apis/meta/v1/unstructured/unstructured.go

@@ -18,6 +18,7 @@ package unstructured
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -50,29 +51,27 @@ var _ runtime.Unstructured = &Unstructured{}
 func (obj *Unstructured) GetObjectKind() schema.ObjectKind { return obj }
 
 func (obj *Unstructured) IsList() bool {
-	if obj.Object != nil {
-		_, ok := obj.Object["items"]
-		return ok
+	field, ok := obj.Object["items"]
+	if !ok {
+		return false
 	}
-	return false
+	_, ok = field.([]interface{})
+	return ok
 }
 
 func (obj *Unstructured) EachListItem(fn func(runtime.Object) error) error {
-	if obj.Object == nil {
-		return fmt.Errorf("content is not a list")
-	}
 	field, ok := obj.Object["items"]
 	if !ok {
-		return fmt.Errorf("content is not a list")
+		return errors.New("content is not a list")
 	}
 	items, ok := field.([]interface{})
 	if !ok {
-		return nil
+		return fmt.Errorf("content is not a list: %T", field)
 	}
 	for _, item := range items {
 		child, ok := item.(map[string]interface{})
 		if !ok {
-			return fmt.Errorf("items member is not an object")
+			return fmt.Errorf("items member is not an object: %T", child)
 		}
 		if err := fn(&Unstructured{Object: child}); err != nil {
 			return err
@@ -162,7 +161,12 @@ func (u *Unstructured) GetOwnerReferences() []metav1.OwnerReference {
 func (u *Unstructured) SetOwnerReferences(references []metav1.OwnerReference) {
 	newReferences := make([]interface{}, 0, len(references))
 	for _, reference := range references {
-		newReferences = append(newReferences, setOwnerReference(reference))
+		out, err := runtime.DefaultUnstructuredConverter.ToUnstructured(&reference)
+		if err != nil {
+			utilruntime.HandleError(fmt.Errorf("unable to convert Owner Reference: %v", err))
+			continue
+		}
+		newReferences = append(newReferences, out)
 	}
 	u.setNestedField(newReferences, "metadata", "ownerReferences")
 }
@@ -301,10 +305,7 @@ func (u *Unstructured) SetDeletionGracePeriodSeconds(deletionGracePeriodSeconds
 }
 
 func (u *Unstructured) GetLabels() map[string]string {
-	m, ok := NestedStringMap(u.Object, "metadata", "labels")
-	if !ok {
-		return nil
-	}
+	m, _ := NestedStringMap(u.Object, "metadata", "labels")
 	return m
 }
 
@@ -313,10 +314,7 @@ func (u *Unstructured) SetLabels(labels map[string]string) {
 }
 
 func (u *Unstructured) GetAnnotations() map[string]string {
-	m, ok := NestedStringMap(u.Object, "metadata", "annotations")
-	if !ok {
-		return nil
-	}
+	m, _ := NestedStringMap(u.Object, "metadata", "annotations")
 	return m
 }
 
@@ -339,18 +337,14 @@ func (u *Unstructured) GroupVersionKind() schema.GroupVersionKind {
 }
 
 func (u *Unstructured) GetInitializers() *metav1.Initializers {
-	field, ok := nestedFieldNoCopy(u.Object, "metadata", "initializers")
-	if !ok {
-		return nil
-	}
-	obj, ok := field.(map[string]interface{})
+	m, ok := nestedMapNoCopy(u.Object, "metadata", "initializers")
 	if !ok {
-		// expected map[string]interface{}, got something else
 		return nil
 	}
 	out := &metav1.Initializers{}
-	if err := runtime.DefaultUnstructuredConverter.FromUnstructured(obj, out); err != nil {
+	if err := runtime.DefaultUnstructuredConverter.FromUnstructured(m, out); err != nil {
 		utilruntime.HandleError(fmt.Errorf("unable to retrieve initializers for object: %v", err))
+		return nil
 	}
 	return out
 }
@@ -368,10 +362,7 @@ func (u *Unstructured) SetInitializers(initializers *metav1.Initializers) {
 }
 
 func (u *Unstructured) GetFinalizers() []string {
-	val, ok := NestedStringSlice(u.Object, "metadata", "finalizers")
-	if !ok {
-		return nil
-	}
+	val, _ := NestedStringSlice(u.Object, "metadata", "finalizers")
 	return val
 }