mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-10-30 21:30:16 +00:00
100 lines
2.9 KiB
Go
100 lines
2.9 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package printers
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
|
|
"github.com/golang/glog"
|
|
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/runtime/schema"
|
|
)
|
|
|
|
// VersionedPrinter takes runtime objects and ensures they are converted to a given API version
|
|
// prior to being passed to a nested printer.
|
|
type VersionedPrinter struct {
|
|
printer ResourcePrinter
|
|
converter runtime.ObjectConvertor
|
|
typer runtime.ObjectTyper
|
|
versions []schema.GroupVersion
|
|
}
|
|
|
|
// NewVersionedPrinter wraps a printer to convert objects to a known API version prior to printing.
|
|
func NewVersionedPrinter(printer ResourcePrinter, converter runtime.ObjectConvertor, typer runtime.ObjectTyper, versions ...schema.GroupVersion) ResourcePrinter {
|
|
return &VersionedPrinter{
|
|
printer: printer,
|
|
converter: converter,
|
|
typer: typer,
|
|
versions: versions,
|
|
}
|
|
}
|
|
|
|
func (p *VersionedPrinter) AfterPrint(w io.Writer, res string) error {
|
|
return nil
|
|
}
|
|
|
|
// PrintObj implements ResourcePrinter
|
|
func (p *VersionedPrinter) PrintObj(obj runtime.Object, w io.Writer) error {
|
|
// if we're unstructured, no conversion necessary
|
|
if _, ok := obj.(*unstructured.Unstructured); ok {
|
|
return p.printer.PrintObj(obj, w)
|
|
}
|
|
// if we aren't a generic printer, we don't convert. This means the printer must be aware of what it is getting.
|
|
// The default printers fall into this category.
|
|
// TODO eventually, all printers must be generic
|
|
if !p.IsGeneric() {
|
|
return p.printer.PrintObj(obj, w)
|
|
}
|
|
|
|
// if we're already external, no conversion necessary
|
|
gvks, _, err := p.typer.ObjectKinds(obj)
|
|
if err != nil {
|
|
glog.V(1).Info("error determining type for %T, using passed object: %v", obj, err)
|
|
return p.printer.PrintObj(obj, w)
|
|
}
|
|
needsConversion := false
|
|
for _, gvk := range gvks {
|
|
if len(gvk.Version) == 0 || gvk.Version == runtime.APIVersionInternal {
|
|
needsConversion = true
|
|
}
|
|
}
|
|
|
|
if !needsConversion {
|
|
return p.printer.PrintObj(obj, w)
|
|
}
|
|
|
|
if len(p.versions) == 0 {
|
|
return fmt.Errorf("no version specified, object cannot be converted")
|
|
}
|
|
converted, err := p.converter.ConvertToVersion(obj, schema.GroupVersions(p.versions))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.printer.PrintObj(converted, w)
|
|
}
|
|
|
|
// TODO: implement HandledResources()
|
|
func (p *VersionedPrinter) HandledResources() []string {
|
|
return []string{}
|
|
}
|
|
|
|
func (p *VersionedPrinter) IsGeneric() bool {
|
|
return p.printer.IsGeneric()
|
|
}
|