8442a118ea
This fixes #38779. This allows us to avoid case in which printers.GetStandardPrinter returns nil for both printer and err removing any potential panics that may arise throughout kubectl commands. Please see #38779 and #38112 for complete context. Add comment explaining adding handlers to printers.HumanReadablePrinter also remove an unnecessary conversion of printers.HumanReadablePrinter to printers.ResourcePrinter.
94 lines
2.5 KiB
Go
94 lines
2.5 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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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/runtime"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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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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Decoders []runtime.Decoder
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Typer runtime.ObjectTyper
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Mapper meta.RESTMapper
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}
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func (p *NamePrinter) AfterPrint(w io.Writer, res string) error {
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return nil
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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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if meta.IsListType(obj) {
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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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if errs := runtime.DecodeList(items, p.Decoders...); len(errs) > 0 {
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return utilerrors.NewAggregate(errs)
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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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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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groupVersionKind := obj.GetObjectKind().GroupVersionKind()
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if len(groupVersionKind.Kind) > 0 {
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if mappings, err := p.Mapper.RESTMappings(groupVersionKind.GroupKind(), groupVersionKind.Version); err == nil && len(mappings) > 0 {
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fmt.Fprintf(w, "%s/%s\n", mappings[0].Resource, name)
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return nil
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}
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}
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if gvks, _, err := p.Typer.ObjectKinds(obj); err == nil {
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for _, gvk := range gvks {
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if mappings, err := p.Mapper.RESTMappings(gvk.GroupKind(), gvk.Version); err == nil && len(mappings) > 0 {
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fmt.Fprintf(w, "%s/%s\n", mappings[0].Resource, name)
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return nil
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}
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}
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}
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fmt.Fprintf(w, "<unknown>/%s\n", name)
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return nil
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}
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// TODO: implement HandledResources()
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func (p *NamePrinter) HandledResources() []string {
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return []string{}
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}
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func (p *NamePrinter) IsGeneric() bool {
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return true
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}
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