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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.
110 lines
2.5 KiB
Go
110 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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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"k8s.io/apimachinery/pkg/runtime"
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"github.com/ghodss/yaml"
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)
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// JSONPrinter is an implementation of ResourcePrinter which outputs an object as JSON.
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type JSONPrinter struct {
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}
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func (p *JSONPrinter) 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 simply writes the object to the Writer.
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func (p *JSONPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
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switch obj := obj.(type) {
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case *runtime.Unknown:
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var buf bytes.Buffer
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err := json.Indent(&buf, obj.Raw, "", " ")
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if err != nil {
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return err
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}
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buf.WriteRune('\n')
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_, err = buf.WriteTo(w)
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return err
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}
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data, err := json.MarshalIndent(obj, "", " ")
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if err != nil {
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return err
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}
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data = append(data, '\n')
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_, err = w.Write(data)
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return err
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}
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// TODO: implement HandledResources()
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func (p *JSONPrinter) HandledResources() []string {
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return []string{}
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}
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func (p *JSONPrinter) IsGeneric() bool {
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return true
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}
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// YAMLPrinter is an implementation of ResourcePrinter which outputs an object as YAML.
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// The input object is assumed to be in the internal version of an API and is converted
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// to the given version first.
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type YAMLPrinter struct {
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version string
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converter runtime.ObjectConvertor
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}
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func (p *YAMLPrinter) AfterPrint(w io.Writer, res string) error {
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return nil
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}
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// PrintObj prints the data as YAML.
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func (p *YAMLPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
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switch obj := obj.(type) {
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case *runtime.Unknown:
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data, err := yaml.JSONToYAML(obj.Raw)
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if err != nil {
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return err
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}
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_, err = w.Write(data)
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return err
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}
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output, err := yaml.Marshal(obj)
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if err != nil {
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return err
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}
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_, err = fmt.Fprint(w, string(output))
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return err
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}
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// TODO: implement HandledResources()
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func (p *YAMLPrinter) HandledResources() []string {
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return []string{}
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}
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func (p *YAMLPrinter) IsGeneric() bool {
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return true
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}
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