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versioned.go
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versioned.go
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/*
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 {
// We might be an external type, but have empty kind/apiVersion fields. Ensure they are populated before printing.
if obj.GetObjectKind().GroupVersionKind().Empty() {
obj = obj.DeepCopyObject()
obj.GetObjectKind().SetGroupVersionKind(gvks[0])
}
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()
}