Allow for returning map[string]interface{} from patch.

pkg/client/record/events_cache.go

@@ -244,7 +244,7 @@ func (e *eventLogger) eventObserve(newEvent *v1.Event) (*v1.Event, []byte, error
 
 		newData, _ := json.Marshal(event)
 		oldData, _ := json.Marshal(eventCopy2)
-		patch, err = strategicpatch.CreateStrategicMergePatch(oldData, newData, event)
+		patch, err = strategicpatch.CreateTwoWayMergePatch(oldData, newData, event)
 	}
 
 	// record our new observation

pkg/controller/volume/attachdetach/statusupdater/node_status_updater.go

@@ -111,10 +111,10 @@ func (nsu *nodeStatusUpdater) UpdateNodeStatuses() error {
 		}
 
 		patchBytes, err :=
-			strategicpatch.CreateStrategicMergePatch(oldData, newData, node)
+			strategicpatch.CreateTwoWayMergePatch(oldData, newData, node)
 		if err != nil {
 			return fmt.Errorf(
-				"failed to CreateStrategicMergePatch for node %q. %v",
+				"failed to CreateTwoWayMergePatch for node %q. %v",
 				nodeName,
 				err)
 		}

pkg/genericapiserver/api/handlers/rest.go

@@ -607,11 +607,11 @@ func patchResource(
 			if err != nil {
 				return nil, err
 			}
-			currentPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, currentObjectJS, versionedObj)
+			currentPatch, err := strategicpatch.CreateTwoWayMergePatch(originalObjJS, currentObjectJS, versionedObj)
 			if err != nil {
 				return nil, err
 			}
-			originalPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, originalPatchedObjJS, versionedObj)
+			originalPatch, err := strategicpatch.CreateTwoWayMergePatch(originalObjJS, originalPatchedObjJS, versionedObj)
 			if err != nil {
 				return nil, err
 			}
@@ -1090,7 +1090,7 @@ func getPatchedJS(patchType types.PatchType, originalJS, patchJS []byte, obj run
 	case types.MergePatchType:
 		return jsonpatch.MergePatch(originalJS, patchJS)
 	case types.StrategicMergePatchType:
-		return strategicpatch.StrategicMergePatchData(originalJS, patchJS, obj)
+		return strategicpatch.StrategicMergePatch(originalJS, patchJS, obj)
 	default:
 		// only here as a safety net - go-restful filters content-type
 		return nil, fmt.Errorf("unknown Content-Type header for patch: %v", patchType)

pkg/genericapiserver/api/handlers/rest_test.go

@@ -215,7 +215,7 @@ func (tc *patchTestCase) Run(t *testing.T) {
 			continue
 
 		case types.StrategicMergePatchType:
-			patch, err = strategicpatch.CreateStrategicMergePatch(originalObjJS, changedJS, versionedObj)
+			patch, err = strategicpatch.CreateTwoWayMergePatch(originalObjJS, changedJS, versionedObj)
 			if err != nil {
 				t.Errorf("%s: unexpected error: %v", tc.name, err)
 				return

pkg/kubectl/cmd/patch.go

@@ -261,7 +261,7 @@ func getPatchedJSON(patchType types.PatchType, originalJS, patchJS []byte, obj r
 		return jsonpatch.MergePatch(originalJS, patchJS)
 
 	case types.StrategicMergePatchType:
-		return strategicpatch.StrategicMergePatchData(originalJS, patchJS, obj)
+		return strategicpatch.StrategicMergePatch(originalJS, patchJS, obj)
 
 	default:
 		// only here as a safety net - go-restful filters content-type

pkg/util/strategicpatch/patch.go

@@ -48,6 +48,13 @@ const (
 	deleteFromPrimitiveListDirectivePrefix = "$deleteFromPrimitiveList"
 )
 
+// JSONMap is a representations of JSON object encoded as map[string]interface{}
+// where the children can be either map[string]interface{}, []interface{} or
+// primitive type).
+// Operating on JSONMap representation is much faster as it doesn't require any
+// json marshaling and/or unmarshaling operations.
+type JSONMap map[string]interface{}
+
 // IsPreconditionFailed returns true if the provided error indicates
 // a precondition failed.
 func IsPreconditionFailed(err error) bool {
@@ -136,11 +143,6 @@ func RequireMetadataKeyUnchanged(key string) PreconditionFunc {
 	}
 }
 
-// Deprecated: Use the synonym CreateTwoWayMergePatch, instead.
-func CreateStrategicMergePatch(original, modified []byte, dataStruct interface{}) ([]byte, error) {
-	return CreateTwoWayMergePatch(original, modified, dataStruct)
-}
-
 // CreateTwoWayMergePatch creates a patch that can be passed to StrategicMergePatch from an original
 // document and a modified document, which are passed to the method as json encoded content. It will
 // return a patch that yields the modified document when applied to the original document, or an error
@@ -160,12 +162,24 @@ func CreateTwoWayMergePatch(original, modified []byte, dataStruct interface{}, f
 		}
 	}
 
+	patchMap, err := CreateTwoWayMergeMapPatch(originalMap, modifiedMap, dataStruct, fns...)
+	if err != nil {
+		return nil, err
+	}
+
+	return json.Marshal(patchMap)
+}
+
+// CreateTwoWayMergeMapPatch creates a patch from an original and modified JSON objects,
+// encoded JSONMap.
+// The serialized version of the map can then be passed to StrategicMergeMapPatch.
+func CreateTwoWayMergeMapPatch(original, modified JSONMap, dataStruct interface{}, fns ...PreconditionFunc) (JSONMap, error) {
 	t, err := getTagStructType(dataStruct)
 	if err != nil {
 		return nil, err
 	}
 
-	patchMap, err := diffMaps(originalMap, modifiedMap, t, false, false)
+	patchMap, err := diffMaps(original, modified, t, false, false)
 	if err != nil {
 		return nil, err
 	}
@@ -177,7 +191,7 @@ func CreateTwoWayMergePatch(original, modified []byte, dataStruct interface{}, f
 		}
 	}
 
-	return json.Marshal(patchMap)
+	return patchMap, nil
 }
 
 // Returns a (recursive) strategic merge patch that yields modified when applied to original.
@@ -494,12 +508,6 @@ loopB:
 	return patch, nil
 }
 
-// Deprecated: StrategicMergePatchData is deprecated. Use the synonym StrategicMergePatch,
-// instead, which follows the naming convention of evanphx/json-patch.
-func StrategicMergePatchData(original, patch []byte, dataStruct interface{}) ([]byte, error) {
-	return StrategicMergePatch(original, patch, dataStruct)
-}
-
 // StrategicMergePatch applies a strategic merge patch. The patch and the original document
 // must be json encoded content. A patch can be created from an original and a modified document
 // by calling CreateStrategicMergePatch.
@@ -524,12 +532,7 @@ func StrategicMergePatch(original, patch []byte, dataStruct interface{}) ([]byte
 		return nil, errBadJSONDoc
 	}
 
-	t, err := getTagStructType(dataStruct)
-	if err != nil {
-		return nil, err
-	}
-
-	result, err := mergeMap(originalMap, patchMap, t, true)
+	result, err := StrategicMergeMapPatch(originalMap, patchMap, dataStruct)
 	if err != nil {
 		return nil, err
 	}
@@ -537,6 +540,17 @@ func StrategicMergePatch(original, patch []byte, dataStruct interface{}) ([]byte
 	return json.Marshal(result)
 }
 
+// StrategicMergePatch applies a strategic merge patch. The original and patch documents
+// must be JSONMap. A patch can be created from an original and modified document by
+// calling CreateTwoWayMergeMapPatch.
+func StrategicMergeMapPatch(original, patch JSONMap, dataStruct interface{}) (JSONMap, error) {
+	t, err := getTagStructType(dataStruct)
+	if err != nil {
+		return nil, err
+	}
+	return mergeMap(original, patch, t, true)
+}
+
 func getTagStructType(dataStruct interface{}) (reflect.Type, error) {
 	if dataStruct == nil {
 		return nil, fmt.Errorf(errBadArgTypeFmt, "struct", "nil")