Golang strategicpatch.CreateStrategicMergePatch函数代码示例

func RunEdit(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, filenames []string) error {
	addSource := func(b *resource.Builder, enforceNamespace bool, printer kubectl.ResourcePrinter) *resource.Builder {
		return b.FilenameParam(enforceNamespace, filenames...).
			ResourceTypeOrNameArgs(true, args...).
			Latest()
	}

	process := func(visitor resource.Visitor, original, edited []byte, obj runtime.Object, updates *resource.Info, file string, results *editResults, mapper meta.RESTMapper, defaultVersion string) error {
		// use strategic merge to create a patch
		originalJS, err := yaml.ToJSON(original)
		if err != nil {
			return preservedFile(err, file, out)
		}
		editedJS, err := yaml.ToJSON(edited)
		if err != nil {
			return preservedFile(err, file, out)
		}
		patch, err := strategicpatch.CreateStrategicMergePatch(originalJS, editedJS, obj)
		// TODO: change all jsonmerge to strategicpatch
		// for checking preconditions
		preconditions := []jsonmerge.PreconditionFunc{}
		if err != nil {
			glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
			return preservedFile(err, file, out)
		} else {
			preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("apiVersion"))
			preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("kind"))
			preconditions = append(preconditions, jsonmerge.RequireMetadataKeyUnchanged("name"))
			results.version = defaultVersion
		}

		if hold, msg := jsonmerge.TestPreconditionsHold(patch, preconditions); !hold {
			fmt.Fprintf(out, "error: %s", msg)
			return preservedFile(nil, file, out)
		}

		return visitor.Visit(func(info *resource.Info, err error) error {
			patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
			if err != nil {
				fmt.Fprintln(out, results.addError(err, info))
				return nil
			}
			info.Refresh(patched, true)
			cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, "edited")
			return nil
		})
	}

	return doEdit(f, out, cmd, "kubectl-edit-", true, addSource, process)
}

// StartRecordingToSink starts sending events received from the specified eventBroadcaster to the given sink.
// The return value can be ignored or used to stop recording, if desired.
// TODO: make me an object with parameterizable queue length and retry interval
func (eventBroadcaster *eventBroadcasterImpl) StartRecordingToSink(sink EventSink) watch.Interface {
	// The default math/rand package functions aren't thread safe, so create a
	// new Rand object for each StartRecording call.
	randGen := rand.New(rand.NewSource(time.Now().UnixNano()))
	var eventCache *historyCache = NewEventCache()
	return eventBroadcaster.StartEventWatcher(
		func(event *api.Event) {
			// Make a copy before modification, because there could be multiple listeners.
			// Events are safe to copy like this.
			eventCopy := *event
			event = &eventCopy
			var patch []byte
			previousEvent := eventCache.getEvent(event)
			updateExistingEvent := previousEvent.Count > 0
			if updateExistingEvent {
				// we still need to copy Name because the Patch relies on the Name to find the target event
				event.Name = previousEvent.Name
				event.Count = previousEvent.Count + 1

				// we need to make sure the Count and LastTimestamp are the only differences between event and the eventCopy2
				eventCopy2 := *event
				eventCopy2.Count = 0
				eventCopy2.LastTimestamp = unversioned.NewTime(time.Unix(0, 0))
				newData, _ := json.Marshal(event)
				oldData, _ := json.Marshal(eventCopy2)
				patch, _ = strategicpatch.CreateStrategicMergePatch(oldData, newData, event)
			}

			tries := 0
			for {
				if recordEvent(sink, event, patch, updateExistingEvent, eventCache) {
					break
				}
				tries++
				if tries >= maxTriesPerEvent {
					glog.Errorf("Unable to write event '%#v' (retry limit exceeded!)", event)
					break
				}
				// Randomize the first sleep so that various clients won't all be
				// synced up if the master goes down.
				if tries == 1 {
					time.Sleep(time.Duration(float64(sleepDuration) * randGen.Float64()))
				} else {
					time.Sleep(sleepDuration)
				}
			}
		})
}

// eventObserve records the event, and determines if its frequency should update
func (e *eventLogger) eventObserve(newEvent *api.Event) (*api.Event, []byte, error) {
	var (
		patch []byte
		err   error
	)
	key := getEventKey(newEvent)
	eventCopy := *newEvent
	event := &eventCopy

	e.Lock()
	defer e.Unlock()

	lastObservation := e.lastEventObservationFromCache(key)

	// we have seen this event before, so we must prepare a patch
	if lastObservation.count > 0 {
		// update the event based on the last observation so patch will work as desired
		event.Name = lastObservation.name
		event.ResourceVersion = lastObservation.resourceVersion
		event.FirstTimestamp = lastObservation.firstTimestamp
		event.Count = int32(lastObservation.count) + 1

		eventCopy2 := *event
		eventCopy2.Count = 0
		eventCopy2.LastTimestamp = unversioned.NewTime(time.Unix(0, 0))

		newData, _ := json.Marshal(event)
		oldData, _ := json.Marshal(eventCopy2)
		// TODO: need to figure out if we need to let eventObserve() use the new behavior of StrategicMergePatch.
		// Currently default to old behavior now. Ref: issue #35936
		patch, err = strategicpatch.CreateStrategicMergePatch(oldData, newData, event, strategicpatch.SMPatchVersion_1_0)
	}

	// record our new observation
	e.cache.Add(
		key,
		eventLog{
			count:           int(event.Count),
			firstTimestamp:  event.FirstTimestamp,
			name:            event.Name,
			resourceVersion: event.ResourceVersion,
		},
	)
	return event, patch, err
}

// eventObserve records the event, and determines if its frequency should update
func (e *eventLogger) eventObserve(newEvent *api.Event) (*api.Event, []byte, error) {
	var (
		patch []byte
		err   error
	)
	key := getEventKey(newEvent)
	eventCopy := *newEvent
	event := &eventCopy

	e.Lock()
	defer e.Unlock()

	lastObservation := e.lastEventObservationFromCache(key)

	// we have seen this event before, so we must prepare a patch
	if lastObservation.count > 0 {
		// update the event based on the last observation so patch will work as desired
		event.Name = lastObservation.name
		event.ResourceVersion = lastObservation.resourceVersion
		event.FirstTimestamp = lastObservation.firstTimestamp
		event.Count = int32(lastObservation.count) + 1

		eventCopy2 := *event
		eventCopy2.Count = 0
		eventCopy2.LastTimestamp = unversioned.NewTime(time.Unix(0, 0))

		newData, _ := json.Marshal(event)
		oldData, _ := json.Marshal(eventCopy2)
		// Defaulting to SMPatchVersion_1_5 is safe, since we only update Count and LastTimestamp, and none of them has list of primitives
		patch, err = strategicpatch.CreateStrategicMergePatch(oldData, newData, event, strategicpatch.SMPatchVersion_1_5)
	}

	// record our new observation
	e.cache.Add(
		key,
		eventLog{
			count:           int(event.Count),
			firstTimestamp:  event.FirstTimestamp,
			name:            event.Name,
			resourceVersion: event.ResourceVersion,
		},
	)
	return event, patch, err
}

func updateResource(target *resource.Info, currentObj runtime.Object) error {

	encoder := api.Codecs.LegacyCodec(registered.EnabledVersions()...)
	originalSerialization, err := runtime.Encode(encoder, currentObj)
	if err != nil {
		return err
	}

	editedSerialization, err := runtime.Encode(encoder, target.Object)
	if err != nil {
		return err
	}

	originalJS, err := yaml.ToJSON(originalSerialization)
	if err != nil {
		return err
	}

	editedJS, err := yaml.ToJSON(editedSerialization)
	if err != nil {
		return err
	}

	if reflect.DeepEqual(originalJS, editedJS) {
		return ErrAlreadyExists{target.Name}
	}

	patch, err := strategicpatch.CreateStrategicMergePatch(originalJS, editedJS, currentObj)
	if err != nil {
		return err
	}

	// send patch to server
	helper := resource.NewHelper(target.Client, target.Mapping)
	if _, err = helper.Patch(target.Namespace, target.Name, api.StrategicMergePatchType, patch); err != nil {
		return err
	}

	return nil
}

// patchResource divides PatchResource for easier unit testing
func patchResource(ctx api.Context, timeout time.Duration, versionedObj runtime.Object, patcher rest.Patcher, name string, patchType api.PatchType, patchJS []byte, namer ScopeNamer, codec runtime.Codec) (runtime.Object, error) {
	namespace := api.NamespaceValue(ctx)

	original, err := patcher.Get(ctx, name)
	if err != nil {
		return nil, err
	}

	originalObjJS, err := codec.Encode(original)
	if err != nil {
		return nil, err
	}
	originalPatchedObjJS, err := getPatchedJS(patchType, originalObjJS, patchJS, versionedObj)
	if err != nil {
		return nil, err
	}

	objToUpdate := patcher.New()
	if err := codec.DecodeInto(originalPatchedObjJS, objToUpdate); err != nil {
		return nil, err
	}
	if err := checkName(objToUpdate, name, namespace, namer); err != nil {
		return nil, err
	}

	return finishRequest(timeout, func() (runtime.Object, error) {
		// update should never create as previous get would fail
		updateObject, _, updateErr := patcher.Update(ctx, objToUpdate)
		for i := 0; i < MaxPatchConflicts && (errors.IsConflict(updateErr)); i++ {

			// on a conflict,
			// 1. build a strategic merge patch from originalJS and the patchedJS.  Different patch types can
			//    be specified, but a strategic merge patch should be expressive enough handle them.  Build the
			//    patch with this type to handle those cases.
			// 2. build a strategic merge patch from originalJS and the currentJS
			// 3. ensure no conflicts between the two patches
			// 4. apply the #1 patch to the currentJS object
			// 5. retry the update
			currentObject, err := patcher.Get(ctx, name)
			if err != nil {
				return nil, err
			}
			currentObjectJS, err := codec.Encode(currentObject)
			if err != nil {
				return nil, err
			}

			currentPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, currentObjectJS, patcher.New())
			if err != nil {
				return nil, err
			}
			originalPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, originalPatchedObjJS, patcher.New())
			if err != nil {
				return nil, err
			}

			diff1 := make(map[string]interface{})
			if err := json.Unmarshal(originalPatch, &diff1); err != nil {
				return nil, err
			}
			diff2 := make(map[string]interface{})
			if err := json.Unmarshal(currentPatch, &diff2); err != nil {
				return nil, err
			}
			hasConflicts, err := strategicpatch.HasConflicts(diff1, diff2)
			if err != nil {
				return nil, err
			}
			if hasConflicts {
				return updateObject, updateErr
			}

			newlyPatchedObjJS, err := getPatchedJS(api.StrategicMergePatchType, currentObjectJS, originalPatch, versionedObj)
			if err != nil {
				return nil, err
			}
			if err := codec.DecodeInto(newlyPatchedObjJS, objToUpdate); err != nil {
				return nil, err
			}

			updateObject, _, updateErr = patcher.Update(ctx, objToUpdate)
		}

		return updateObject, updateErr
	})
}

func (nsu *nodeStatusUpdater) UpdateNodeStatuses() error {
	nodesToUpdate := nsu.actualStateOfWorld.GetVolumesToReportAttached()
	for nodeName, attachedVolumes := range nodesToUpdate {
		nodeObj, exists, err := nsu.nodeInformer.GetStore().GetByKey(nodeName)
		if nodeObj == nil || !exists || err != nil {
			return fmt.Errorf(
				"failed to find node %q in NodeInformer cache. %v",
				nodeName,
				err)
		}

		node, ok := nodeObj.(*api.Node)
		if !ok || node == nil {
			return fmt.Errorf(
				"failed to cast %q object %#v to Node",
				nodeName,
				nodeObj)
		}

		oldData, err := json.Marshal(node)
		if err != nil {
			return fmt.Errorf(
				"failed to Marshal oldData for node %q. %v",
				nodeName,
				err)
		}

		node.Status.VolumesAttached = attachedVolumes

		newData, err := json.Marshal(node)
		if err != nil {
			return fmt.Errorf(
				"failed to Marshal newData for node %q. %v",
				nodeName,
				err)
		}

		patchBytes, err :=
			strategicpatch.CreateStrategicMergePatch(oldData, newData, node)
		if err != nil {
			return fmt.Errorf(
				"failed to CreateStrategicMergePatch for node %q. %v",
				nodeName,
				err)
		}

		_, err = nsu.kubeClient.Core().Nodes().PatchStatus(nodeName, patchBytes)
		if err != nil {
			return fmt.Errorf(
				"failed to kubeClient.Core().Nodes().Patch for node %q. %v",
				nodeName,
				err)
		}

		err = nsu.actualStateOfWorld.ResetNodeStatusUpdateNeeded(nodeName)
		if err != nil {
			return fmt.Errorf(
				"failed to ResetNodeStatusUpdateNeeded for node %q. %v",
				nodeName,
				err)
		}

		glog.V(3).Infof(
			"Updating status for node %q succeeded. patchBytes: %q",
			nodeName,
			string(patchBytes))
	}
	return nil
}

//.........这里部分代码省略.........

			results = editResults{
				file: file,
			}

			// parse the edited file
			updates, err := resourceMapper.InfoForData(edited, "edited-file")
			if err != nil {
				return fmt.Errorf("The edited file had a syntax error: %v", err)
			}

			// put configuration annotation in "updates"
			if err := kubectl.CreateOrUpdateAnnotation(cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag), updates, encoder); err != nil {
				return preservedFile(err, file, out)
			}
			if cmdutil.ShouldRecord(cmd, updates) {
				err = cmdutil.RecordChangeCause(updates.Object, f.Command())
				if err != nil {
					return err
				}
			}
			// encode updates back to "edited" since we'll only generate patch from "edited"
			if edited, err = runtime.Encode(encoder, updates.Object); err != nil {
				return preservedFile(err, file, out)
			}

			visitor := resource.NewFlattenListVisitor(updates, resourceMapper)

			// need to make sure the original namespace wasn't changed while editing
			if err = visitor.Visit(resource.RequireNamespace(cmdNamespace)); err != nil {
				return preservedFile(err, file, out)
			}

			// use strategic merge to create a patch
			originalJS, err := yaml.ToJSON(original)
			if err != nil {
				return preservedFile(err, file, out)
			}
			editedJS, err := yaml.ToJSON(edited)
			if err != nil {
				return preservedFile(err, file, out)
			}
			patch, err := strategicpatch.CreateStrategicMergePatch(originalJS, editedJS, obj)
			// TODO: change all jsonmerge to strategicpatch
			// for checking preconditions
			preconditions := []jsonmerge.PreconditionFunc{}
			if err != nil {
				glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
				return preservedFile(err, file, out)
			} else {
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("apiVersion"))
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("kind"))
				preconditions = append(preconditions, jsonmerge.RequireMetadataKeyUnchanged("name"))
				results.version = defaultVersion
			}

			if hold, msg := jsonmerge.TestPreconditionsHold(patch, preconditions); !hold {
				fmt.Fprintf(out, "error: %s", msg)
				return preservedFile(nil, file, out)
			}

			err = visitor.Visit(func(info *resource.Info, err error) error {
				patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
				if err != nil {
					fmt.Fprintln(out, results.addError(err, info))
					return nil
				}
				info.Refresh(patched, true)
				cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, "edited")
				return nil
			})
			if err != nil {
				return preservedFile(err, file, out)
			}

			if results.retryable > 0 {
				fmt.Fprintf(out, "You can run `kubectl replace -f %s` to try this update again.\n", file)
				return errExit
			}
			if results.conflict > 0 {
				fmt.Fprintf(out, "You must update your local resource version and run `kubectl replace -f %s` to overwrite the remote changes.\n", file)
				return errExit
			}
			if len(results.edit) == 0 {
				if results.notfound == 0 {
					os.Remove(file)
				} else {
					fmt.Fprintf(out, "The edits you made on deleted resources have been saved to %q\n", file)
				}
			}
		}
		if len(results.edit) == 0 {
			return nil
		}

		// loop again and edit the remaining items
		infos = results.edit
	}
	return nil
}

func (nsu *nodeStatusUpdater) UpdateNodeStatuses() error {
	nodesToUpdate := nsu.actualStateOfWorld.GetVolumesToReportAttached()
	for nodeName, attachedVolumes := range nodesToUpdate {
		nodeObj, exists, err := nsu.nodeInformer.GetStore().GetByKey(nodeName)
		if nodeObj == nil || !exists || err != nil {
			// If node does not exist, its status cannot be updated, log error and
			// reset flag statusUpdateNeeded back to true to indicate this node status
			// needs to be udpated again
			glog.V(2).Infof(
				"Could not update node status. Failed to find node %q in NodeInformer cache. %v",
				nodeName,
				err)
			nsu.actualStateOfWorld.SetNodeStatusUpdateNeeded(nodeName)
			continue
		}

		clonedNode, err := conversion.NewCloner().DeepCopy(nodeObj)
		if err != nil {
			return fmt.Errorf("error cloning node %q: %v",
				nodeName,
				err)
		}

		node, ok := clonedNode.(*api.Node)
		if !ok || node == nil {
			return fmt.Errorf(
				"failed to cast %q object %#v to Node",
				nodeName,
				clonedNode)
		}

		oldData, err := json.Marshal(node)
		if err != nil {
			return fmt.Errorf(
				"failed to Marshal oldData for node %q. %v",
				nodeName,
				err)
		}

		node.Status.VolumesAttached = attachedVolumes

		newData, err := json.Marshal(node)
		if err != nil {
			return fmt.Errorf(
				"failed to Marshal newData for node %q. %v",
				nodeName,
				err)
		}

		patchBytes, err :=
			strategicpatch.CreateStrategicMergePatch(oldData, newData, node)
		if err != nil {
			return fmt.Errorf(
				"failed to CreateStrategicMergePatch for node %q. %v",
				nodeName,
				err)
		}

		_, err = nsu.kubeClient.Core().Nodes().PatchStatus(nodeName, patchBytes)
		if err != nil {
			// If update node status fails, reset flag statusUpdateNeeded back to true
			// to indicate this node status needs to be udpated again
			nsu.actualStateOfWorld.SetNodeStatusUpdateNeeded(nodeName)
			return fmt.Errorf(
				"failed to kubeClient.Core().Nodes().Patch for node %q. %v",
				nodeName,
				err)
		}
		glog.V(2).Infof(
			"Updating status for node %q succeeded. patchBytes: %q VolumesAttached: %v",
			nodeName,
			string(patchBytes),
			node.Status.VolumesAttached)

	}
	return nil
}

//.........这里部分代码省略.........
					originalObjUID, err := meta.NewAccessor().UID(listItems[i])
					if err != nil {
						return err
					}
					if editObjUID == originalObjUID {
						currOriginalObj = listItems[i]
						break
					}
				}
				if currOriginalObj == nil {
					return fmt.Errorf("no original object found for %#v", info.Object)
				}

			}

			originalSerialization, err := runtime.Encode(encoder, currOriginalObj)
			if err != nil {
				return err
			}
			editedSerialization, err := runtime.Encode(encoder, info.Object)
			if err != nil {
				return err
			}

			// compute the patch on a per-item basis
			// use strategic merge to create a patch
			originalJS, err := yaml.ToJSON(originalSerialization)
			if err != nil {
				return err
			}
			editedJS, err := yaml.ToJSON(editedSerialization)
			if err != nil {
				return err
			}

			if reflect.DeepEqual(originalJS, editedJS) {
				// no edit, so just skip it.
				cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, "skipped")
				return nil
			}

			patch, err := strategicpatch.CreateStrategicMergePatch(originalJS, editedJS, currOriginalObj)
			// TODO: change all jsonmerge to strategicpatch
			// for checking preconditions
			preconditions := []jsonmerge.PreconditionFunc{}
			if err != nil {
				glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
				return err
			} else {
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("apiVersion"))
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("kind"))
				preconditions = append(preconditions, jsonmerge.RequireMetadataKeyUnchanged("name"))
				results.version = defaultVersion
			}

			if hold, msg := jsonmerge.TestPreconditionsHold(patch, preconditions); !hold {
				fmt.Fprintf(errOut, "error: %s", msg)
				return preservedFile(nil, file, errOut)
			}

			patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
			if err != nil {
				fmt.Fprintln(out, results.addError(err, info))
				return nil
			}
			info.Refresh(patched, true)
			cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, "edited")
			return nil
		})
		if err != nil {
			return preservedFile(err, results.file, errOut)
		}

		// Handle all possible errors
		//
		// 1. retryable: propose kubectl replace -f
		// 2. notfound: indicate the location of the saved configuration of the deleted resource
		// 3. invalid: retry those on the spot by looping ie. reloading the editor
		if results.retryable > 0 {
			fmt.Fprintf(errOut, "You can run `%s replace -f %s` to try this update again.\n", filepath.Base(os.Args[0]), file)
			return errExit
		}
		if results.notfound > 0 {
			fmt.Fprintf(errOut, "The edits you made on deleted resources have been saved to %q\n", file)
			return errExit
		}

		if len(results.edit) == 0 {
			if results.notfound == 0 {
				os.Remove(file)
			} else {
				fmt.Fprintf(out, "The edits you made on deleted resources have been saved to %q\n", file)
			}
			return nil
		}

		// loop again and edit the remaining items
		infos = results.edit
	}
}

// patchResource divides PatchResource for easier unit testing
func patchResource(
	ctx api.Context,
	admit updateAdmissionFunc,
	timeout time.Duration,
	versionedObj runtime.Object,
	patcher rest.Patcher,
	name string,
	patchType api.PatchType,
	patchJS []byte,
	namer ScopeNamer,
	copier runtime.ObjectCopier,
	resource unversioned.GroupVersionResource,
	codec runtime.Codec,
) (runtime.Object, error) {

	namespace := api.NamespaceValue(ctx)

	var (
		originalObjJS        []byte
		originalPatchedObjJS []byte
		lastConflictErr      error
	)

	// applyPatch is called every time GuaranteedUpdate asks for the updated object,
	// and is given the currently persisted object as input.
	applyPatch := func(_ api.Context, _, currentObject runtime.Object) (runtime.Object, error) {
		// Make sure we actually have a persisted currentObject
		if hasUID, err := hasUID(currentObject); err != nil {
			return nil, err
		} else if !hasUID {
			return nil, errors.NewNotFound(resource.GroupResource(), name)
		}

		switch {
		case len(originalObjJS) == 0 || len(originalPatchedObjJS) == 0:
			// first time through,
			// 1. apply the patch
			// 2. save the originalJS and patchedJS to detect whether there were conflicting changes on retries
			if js, err := runtime.Encode(codec, currentObject); err != nil {
				return nil, err
			} else {
				originalObjJS = js
			}

			if js, err := getPatchedJS(patchType, originalObjJS, patchJS, versionedObj); err != nil {
				return nil, err
			} else {
				originalPatchedObjJS = js
			}

			objToUpdate := patcher.New()
			if err := runtime.DecodeInto(codec, originalPatchedObjJS, objToUpdate); err != nil {
				return nil, err
			}
			if err := checkName(objToUpdate, name, namespace, namer); err != nil {
				return nil, err
			}
			return objToUpdate, nil

		default:
			// on a conflict,
			// 1. build a strategic merge patch from originalJS and the patchedJS.  Different patch types can
			//    be specified, but a strategic merge patch should be expressive enough handle them.  Build the
			//    patch with this type to handle those cases.
			// 2. build a strategic merge patch from originalJS and the currentJS
			// 3. ensure no conflicts between the two patches
			// 4. apply the #1 patch to the currentJS object
			currentObjectJS, err := runtime.Encode(codec, currentObject)
			if err != nil {
				return nil, err
			}
			currentPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, currentObjectJS, versionedObj, strategicpatch.SMPatchVersionLatest)
			if err != nil {
				return nil, err
			}
			originalPatch, err := strategicpatch.CreateStrategicMergePatch(originalObjJS, originalPatchedObjJS, versionedObj, strategicpatch.SMPatchVersionLatest)
			if err != nil {
				return nil, err
			}

			diff1 := make(map[string]interface{})
			if err := json.Unmarshal(originalPatch, &diff1); err != nil {
				return nil, err
			}
			diff2 := make(map[string]interface{})
			if err := json.Unmarshal(currentPatch, &diff2); err != nil {
				return nil, err
			}
			hasConflicts, err := strategicpatch.HasConflicts(diff1, diff2)
			if err != nil {
				return nil, err
			}
			if hasConflicts {
				glog.V(4).Infof("patchResource failed for resource %s, because there is a meaningful conflict.\n diff1=%v\n, diff2=%v\n", name, diff1, diff2)
				// Return the last conflict error we got if we have one
				if lastConflictErr != nil {
					return nil, lastConflictErr
				}
				// Otherwise manufacture one of our own
//.........这里部分代码省略.........

//.........这里部分代码省略.........
				file: file,
			}

			// parse the edited file
			updates, err := resourceMapper.InfoForData(edited, "edited-file")
			if err != nil {
				// syntax error
				containsError = true
				results.header.reasons = append(results.header.reasons, editReason{head: fmt.Sprintf("The edited file had a syntax error: %v", err)})
				continue
			}
			// not a syntax error as it turns out...
			containsError = false

			// put configuration annotation in "updates"
			if err := kubectl.CreateOrUpdateAnnotation(cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag), updates, encoder); err != nil {
				return preservedFile(err, file, errOut)
			}
			if cmdutil.ShouldRecord(cmd, updates) {
				err = cmdutil.RecordChangeCause(updates.Object, f.Command())
				if err != nil {
					return err
				}
			}
			editedCopy := edited
			if editedCopy, err = runtime.Encode(encoder, updates.Object); err != nil {
				return preservedFile(err, file, errOut)
			}

			visitor := resource.NewFlattenListVisitor(updates, resourceMapper)

			// need to make sure the original namespace wasn't changed while editing
			if err = visitor.Visit(resource.RequireNamespace(cmdNamespace)); err != nil {
				return preservedFile(err, file, errOut)
			}

			// use strategic merge to create a patch
			originalJS, err := yaml.ToJSON(original)
			if err != nil {
				return preservedFile(err, file, errOut)
			}
			editedJS, err := yaml.ToJSON(editedCopy)
			if err != nil {
				return preservedFile(err, file, errOut)
			}
			patch, err := strategicpatch.CreateStrategicMergePatch(originalJS, editedJS, obj)
			// TODO: change all jsonmerge to strategicpatch
			// for checking preconditions
			preconditions := []jsonmerge.PreconditionFunc{}
			if err != nil {
				glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
				return preservedFile(err, file, errOut)
			} else {
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("apiVersion"))
				preconditions = append(preconditions, jsonmerge.RequireKeyUnchanged("kind"))
				preconditions = append(preconditions, jsonmerge.RequireMetadataKeyUnchanged("name"))
				results.version = defaultVersion
			}

			if hold, msg := jsonmerge.TestPreconditionsHold(patch, preconditions); !hold {
				fmt.Fprintf(errOut, "error: %s\n", msg)
				return preservedFile(nil, file, errOut)
			}

			errorMsg := ""
			err = visitor.Visit(func(info *resource.Info, err error) error {
				patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
				if err != nil {
					errorMsg = results.addError(err, info)
					return err
				}
				info.Refresh(patched, true)
				cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, "edited")
				return nil
			})
			if err == nil {
				os.Remove(file)
				continue outter
			}
			// Handle all possible errors
			//
			// 1. retryable: propose kubectl replace -f
			// 2. notfound: indicate the location of the saved configuration of the deleted resource
			// 3. invalid: retry those on the spot by looping ie. reloading the editor
			if results.retryable > 0 {
				fmt.Fprintln(errOut, errorMsg)
				fmt.Fprintf(errOut, "You can run `%s replace -f %s` to try this update again.\n", path.Base(os.Args[0]), file)
				continue outter
			}
			if results.notfound > 0 {
				fmt.Fprintln(errOut, errorMsg)
				fmt.Fprintf(errOut, "The edits you made on deleted resources have been saved to %q\n", file)
				continue outter
			}
			// validation error
			containsError = true
		}
	}
	return nil
}

func (tc *patchTestCase) Run(t *testing.T) {
	t.Logf("Starting test %s", tc.name)

	namespace := tc.startingPod.Namespace
	name := tc.startingPod.Name

	codec := testapi.Default.Codec()
	admit := tc.admit
	if admit == nil {
		admit = func(updatedObject runtime.Object) error {
			return nil
		}
	}

	testPatcher := &testPatcher{}
	testPatcher.startingPod = tc.startingPod
	testPatcher.updatePod = tc.updatePod

	ctx := api.NewDefaultContext()
	ctx = api.WithNamespace(ctx, namespace)

	namer := &testNamer{namespace, name}

	versionedObj, err := api.Scheme.ConvertToVersion(&api.Pod{}, "v1")
	if err != nil {
		t.Errorf("%s: unexpected error: %v", tc.name, err)
		return
	}

	for _, patchType := range []api.PatchType{api.JSONPatchType, api.MergePatchType, api.StrategicMergePatchType} {
		// TODO SUPPORT THIS!
		if patchType == api.JSONPatchType {
			continue
		}
		t.Logf("Working with patchType %v", patchType)

		originalObjJS, err := runtime.Encode(codec, tc.startingPod)
		if err != nil {
			t.Errorf("%s: unexpected error: %v", tc.name, err)
			return
		}
		changedJS, err := runtime.Encode(codec, tc.changedPod)
		if err != nil {
			t.Errorf("%s: unexpected error: %v", tc.name, err)
			return
		}

		patch := []byte{}
		switch patchType {
		case api.JSONPatchType:
			continue

		case api.StrategicMergePatchType:
			patch, err = strategicpatch.CreateStrategicMergePatch(originalObjJS, changedJS, versionedObj)
			if err != nil {
				t.Errorf("%s: unexpected error: %v", tc.name, err)
				return
			}

		case api.MergePatchType:
			patch, err = jsonpatch.CreateMergePatch(originalObjJS, changedJS)
			if err != nil {
				t.Errorf("%s: unexpected error: %v", tc.name, err)
				return
			}

		}

		resultObj, err := patchResource(ctx, admit, 1*time.Second, versionedObj, testPatcher, name, patchType, patch, namer, codec)
		if len(tc.expectedError) != 0 {
			if err == nil || err.Error() != tc.expectedError {
				t.Errorf("%s: expected error %v, but got %v", tc.name, tc.expectedError, err)
				return
			}
		} else {
			if err != nil {
				t.Errorf("%s: unexpected error: %v", tc.name, err)
				return
			}
		}

		if tc.expectedPod == nil {
			if resultObj != nil {
				t.Errorf("%s: unexpected result: %v", tc.name, resultObj)
			}
			return
		}

		resultPod := resultObj.(*api.Pod)

		// roundtrip to get defaulting
		expectedJS, err := runtime.Encode(codec, tc.expectedPod)
		if err != nil {
			t.Errorf("%s: unexpected error: %v", tc.name, err)
			return
		}
		expectedObj, err := runtime.Decode(codec, expectedJS)
		if err != nil {
			t.Errorf("%s: unexpected error: %v", tc.name, err)
			return
//.........这里部分代码省略.........