Golang runtime.IsListType函數代碼示例

// setListSelfLink sets the self link of a list to the base URL, then sets the self links
// on all child objects returned.
func setListSelfLink(obj runtime.Object, req *restful.Request, namer ScopeNamer) error {
	if !runtime.IsListType(obj) {
		return nil
	}

	// TODO: List SelfLink generation should return a full URL?
	path, query, err := namer.GenerateListLink(req)
	if err != nil {
		return err
	}
	newURL := *req.Request.URL
	newURL.Path = path
	newURL.RawQuery = query
	// use the path that got us here
	newURL.Fragment = ""
	if err := namer.SetSelfLink(obj, newURL.String()); err != nil {
		glog.V(4).Infof("Unable to set self link on object: %v", err)
	}

	// Set self-link of objects in the list.
	items, err := runtime.ExtractList(obj)
	if err != nil {
		return err
	}
	for i := range items {
		if err := setSelfLink(items[i], req, namer); err != nil {
			return err
		}
	}
	return runtime.SetList(obj, items)

}

func (o objects) Add(obj runtime.Object) error {
	_, kind, err := o.scheme.ObjectVersionAndKind(obj)
	if err != nil {
		return err
	}

	switch {
	case runtime.IsListType(obj):
		if kind != "List" {
			o.types[kind] = append(o.types[kind], obj)
		}

		list, err := runtime.ExtractList(obj)
		if err != nil {
			return err
		}
		if errs := runtime.DecodeList(list, o.decoder); len(errs) > 0 {
			return errs[0]
		}
		for _, obj := range list {
			if err := o.Add(obj); err != nil {
				return err
			}
		}
	default:
		if status, ok := obj.(*api.Status); ok && status.Details != nil {
			kind = status.Details.Kind
		}
		o.types[kind] = append(o.types[kind], obj)
	}

	return nil
}

func (s *CustomColumnsPrinter) PrintObj(obj runtime.Object, out io.Writer) error {
	w := tabwriter.NewWriter(out, columnwidth, tabwidth, padding, padding_character, flags)
	headers := make([]string, len(s.Columns))
	for ix := range s.Columns {
		headers[ix] = s.Columns[ix].Header
	}
	fmt.Fprintln(w, strings.Join(headers, "\t"))
	parsers := make([]*jsonpath.JSONPath, len(s.Columns))
	for ix := range s.Columns {
		parsers[ix] = jsonpath.New(fmt.Sprintf("column%d", ix))
		if err := parsers[ix].Parse(s.Columns[ix].FieldSpec); err != nil {
			return err
		}
	}

	if runtime.IsListType(obj) {
		objs, err := runtime.ExtractList(obj)
		if err != nil {
			return err
		}
		for ix := range objs {
			if err := s.printOneObject(objs[ix], parsers, w); err != nil {
				return err
			}
		}
	} else {
		if err := s.printOneObject(obj, parsers, w); err != nil {
			return err
		}
	}
	return w.Flush()
}

func filterListInTenant(obj runtime.Object, tenant string, kind string, namer ScopeNamer) error {

	var (
		result = []runtime.Object{}
	)
	if !runtime.IsListType(obj) {
		return nil
	}

	items, err := runtime.ExtractList(obj)
	if err != nil {
		return err
	}
	for i := range items {
		if name, err := namer.ObjectTenant(items[i]); err == nil {
			if tenant == name {
				result = append(result, items[i])
				continue
			}
			if name == "" {
				result = append(result, items[i])
			}
		}
	}

	return runtime.SetList(obj, result)
}

func (s *SortingPrinter) PrintObj(obj runtime.Object, out io.Writer) error {
	if !runtime.IsListType(obj) {
		return s.Delegate.PrintObj(obj, out)
	}

	if err := s.sortObj(obj); err != nil {
		return err
	}
	return s.Delegate.PrintObj(obj, out)
}

func (s *SortingPrinter) PrintObj(obj runtime.Object, out io.Writer) error {
	if !runtime.IsListType(obj) {
		fmt.Fprintf(out, "Not a list, skipping: %#v\n", obj)
		return s.Delegate.PrintObj(obj, out)
	}

	if err := s.sortObj(obj); err != nil {
		return err
	}
	return s.Delegate.PrintObj(obj, out)
}

func TestIsList(t *testing.T) {
	tests := []struct {
		obj    runtime.Object
		isList bool
	}{
		{&api.PodList{}, true},
		{&api.Pod{}, false},
	}
	for _, item := range tests {
		if e, a := item.isList, runtime.IsListType(item.obj); e != a {
			t.Errorf("%v: Expected %v, got %v", reflect.TypeOf(item.obj), e, a)
		}
	}
}

// RetrieveLatest updates the Object on each Info by invoking a standard client
// Get.
func RetrieveLatest(info *Info, err error) error {
	if err != nil {
		return err
	}
	if runtime.IsListType(info.Object) {
		return fmt.Errorf("watch is only supported on individual resources and resource collections, but a list of resources is found")
	}
	if len(info.Name) == 0 {
		return nil
	}
	if info.Namespaced() && len(info.Namespace) == 0 {
		return fmt.Errorf("no namespace set on resource %s %q", info.Mapping.Resource, info.Name)
	}
	obj, err := NewHelper(info.Client, info.Mapping).Get(info.Namespace, info.Name)
	if err != nil {
		return err
	}
	info.Object = obj
	info.ResourceVersion, _ = info.Mapping.MetadataAccessor.ResourceVersion(obj)
	return nil
}

// Object returns a single object representing the output of a single visit to all
// found resources.  If the Builder was a singular context (expected to return a
// single resource by user input) and only a single resource was found, the resource
// will be returned as is.  Otherwise, the returned resources will be part of an
// api.List. The ResourceVersion of the api.List will be set only if it is identical
// across all infos returned.
func (r *Result) Object() (runtime.Object, error) {
	infos, err := r.Infos()
	if err != nil {
		return nil, err
	}

	versions := util.StringSet{}
	objects := []runtime.Object{}
	for _, info := range infos {
		if info.Object != nil {
			objects = append(objects, info.Object)
			versions.Insert(info.ResourceVersion)
		}
	}

	if len(objects) == 1 {
		if r.singular {
			return objects[0], nil
		}
		// if the item is a list already, don't create another list
		if runtime.IsListType(objects[0]) {
			return objects[0], nil
		}
	}

	version := ""
	if len(versions) == 1 {
		version = versions.List()[0]
	}
	return &api.List{
		ListMeta: api.ListMeta{
			ResourceVersion: version,
		},
		Items: objects,
	}, err
}