mirror of
https://github.com/ceph/ceph-csi.git
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125 lines
3.8 KiB
Go
125 lines
3.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package printers
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import (
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"fmt"
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"io"
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"reflect"
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"strings"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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// NamePrinter is an implementation of ResourcePrinter which outputs "resource/name" pair of an object.
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type NamePrinter struct {
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// ShortOutput indicates whether an operation should be
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// printed along side the "resource/name" pair for an object.
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ShortOutput bool
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// Operation describes the name of the action that
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// took place on an object, to be included in the
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// finalized "successful" message.
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Operation string
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}
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// PrintObj is an implementation of ResourcePrinter.PrintObj which decodes the object
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// and print "resource/name" pair. If the object is a List, print all items in it.
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func (p *NamePrinter) PrintObj(obj runtime.Object, w io.Writer) error {
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// we use reflect.Indirect here in order to obtain the actual value from a pointer.
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// using reflect.Indirect indiscriminately is valid here, as all runtime.Objects are supposed to be pointers.
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// we need an actual value in order to retrieve the package path for an object.
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if InternalObjectPreventer.IsForbidden(reflect.Indirect(reflect.ValueOf(obj)).Type().PkgPath()) {
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return fmt.Errorf(InternalObjectPrinterErr)
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}
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if meta.IsListType(obj) {
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// we allow unstructured lists for now because they always contain the GVK information. We should chase down
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// callers and stop them from passing unflattened lists
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// TODO chase the caller that is setting this and remove it.
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if _, ok := obj.(*unstructured.UnstructuredList); !ok {
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return fmt.Errorf("list types are not supported by name printing: %T", obj)
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}
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items, err := meta.ExtractList(obj)
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if err != nil {
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return err
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}
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for _, obj := range items {
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if err := p.PrintObj(obj, w); err != nil {
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return err
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}
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}
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return nil
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}
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if obj.GetObjectKind().GroupVersionKind().Empty() {
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return fmt.Errorf("missing apiVersion or kind; try GetObjectKind().SetGroupVersionKind() if you know the type")
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}
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name := "<unknown>"
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if acc, err := meta.Accessor(obj); err == nil {
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if n := acc.GetName(); len(n) > 0 {
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name = n
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}
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}
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return printObj(w, name, p.Operation, p.ShortOutput, GetObjectGroupKind(obj))
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}
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func GetObjectGroupKind(obj runtime.Object) schema.GroupKind {
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if obj == nil {
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return schema.GroupKind{Kind: "<unknown>"}
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}
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groupVersionKind := obj.GetObjectKind().GroupVersionKind()
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if len(groupVersionKind.Kind) > 0 {
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return groupVersionKind.GroupKind()
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}
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if uns, ok := obj.(*unstructured.Unstructured); ok {
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if len(uns.GroupVersionKind().Kind) > 0 {
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return uns.GroupVersionKind().GroupKind()
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}
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}
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return schema.GroupKind{Kind: "<unknown>"}
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}
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func printObj(w io.Writer, name string, operation string, shortOutput bool, groupKind schema.GroupKind) error {
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if len(groupKind.Kind) == 0 {
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return fmt.Errorf("missing kind for resource with name %v", name)
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}
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if len(operation) > 0 {
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operation = " " + operation
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}
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if shortOutput {
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operation = ""
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}
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if len(groupKind.Group) == 0 {
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fmt.Fprintf(w, "%s/%s%s\n", strings.ToLower(groupKind.Kind), name, operation)
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return nil
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}
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fmt.Fprintf(w, "%s.%s/%s%s\n", strings.ToLower(groupKind.Kind), groupKind.Group, name, operation)
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return nil
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}
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