Update godeps

vendor/k8s.io/kubernetes/pkg/api/rest/update.go

@@ -21,6 +21,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/errors"
+	"k8s.io/kubernetes/pkg/api/meta"
 	"k8s.io/kubernetes/pkg/api/validation"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util/validation/field"
@@ -103,3 +104,72 @@ func BeforeUpdate(strategy RESTUpdateStrategy, ctx api.Context, obj, old runtime
 
 	return nil
 }
+
+// TransformFunc is a function to transform and return newObj
+type TransformFunc func(ctx api.Context, newObj runtime.Object, oldObj runtime.Object) (transformedNewObj runtime.Object, err error)
+
+// defaultUpdatedObjectInfo implements UpdatedObjectInfo
+type defaultUpdatedObjectInfo struct {
+	// obj is the updated object
+	obj runtime.Object
+
+	// copier makes a copy of the object before returning it.
+	// this allows repeated calls to UpdatedObject() to return
+	// pristine data, even if the returned value is mutated.
+	copier runtime.ObjectCopier
+
+	// transformers is an optional list of transforming functions that modify or
+	// replace obj using information from the context, old object, or other sources.
+	transformers []TransformFunc
+}
+
+// DefaultUpdatedObjectInfo returns an UpdatedObjectInfo impl based on the specified object.
+func DefaultUpdatedObjectInfo(obj runtime.Object, copier runtime.ObjectCopier, transformers ...TransformFunc) UpdatedObjectInfo {
+	return &defaultUpdatedObjectInfo{obj, copier, transformers}
+}
+
+// Preconditions satisfies the UpdatedObjectInfo interface.
+func (i *defaultUpdatedObjectInfo) Preconditions() *api.Preconditions {
+	// Attempt to get the UID out of the object
+	accessor, err := meta.Accessor(i.obj)
+	if err != nil {
+		// If no UID can be read, no preconditions are possible
+		return nil
+	}
+
+	// If empty, no preconditions needed
+	uid := accessor.GetUID()
+	if len(uid) == 0 {
+		return nil
+	}
+
+	return &api.Preconditions{UID: &uid}
+}
+
+// UpdatedObject satisfies the UpdatedObjectInfo interface.
+// It returns a copy of the held obj, passed through any configured transformers.
+func (i *defaultUpdatedObjectInfo) UpdatedObject(ctx api.Context, oldObj runtime.Object) (runtime.Object, error) {
+	var err error
+	// Start with the configured object
+	newObj := i.obj
+
+	// If the original is non-nil (might be nil if the first transformer builds the object from the oldObj), make a copy,
+	// so we don't return the original. BeforeUpdate can mutate the returned object, doing things like clearing ResourceVersion.
+	// If we're re-called, we need to be able to return the pristine version.
+	if newObj != nil {
+		newObj, err = i.copier.Copy(newObj)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	// Allow any configured transformers to update the new object
+	for _, transformer := range i.transformers {
+		newObj, err = transformer(ctx, newObj, oldObj)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return newObj, nil
+}