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.
68 lines
1.9 KiB
Go
68 lines
1.9 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/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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)
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// VersionedPrinter takes runtime objects and ensures they are converted to a given API version
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// prior to being passed to a nested printer.
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type VersionedPrinter struct {
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printer ResourcePrinter
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converter runtime.ObjectConvertor
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versions []schema.GroupVersion
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}
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// NewVersionedPrinter wraps a printer to convert objects to a known API version prior to printing.
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func NewVersionedPrinter(printer ResourcePrinter, converter runtime.ObjectConvertor, versions ...schema.GroupVersion) ResourcePrinter {
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return &VersionedPrinter{
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printer: printer,
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converter: converter,
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versions: versions,
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}
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}
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func (p *VersionedPrinter) AfterPrint(w io.Writer, res string) error {
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return nil
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}
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// PrintObj implements ResourcePrinter
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func (p *VersionedPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
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if len(p.versions) == 0 {
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return fmt.Errorf("no version specified, object cannot be converted")
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}
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converted, err := p.converter.ConvertToVersion(obj, schema.GroupVersions(p.versions))
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if err != nil {
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return err
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}
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return p.printer.PrintObj(converted, w)
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}
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// TODO: implement HandledResources()
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func (p *VersionedPrinter) HandledResources() []string {
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return []string{}
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}
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func (p *VersionedPrinter) IsGeneric() bool {
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return p.printer.IsGeneric()
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}
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