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configcodec.go
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configcodec.go
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// Copyright 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 kubelet
import (
"fmt"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
kubeletconfigv1beta1 "k8s.io/kubelet/config/v1beta1"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
oscutils "github.com/gardener/gardener/pkg/operation/botanist/component/extensions/operatingsystemconfig/utils"
)
// ConfigCodec contains methods for encoding and decoding *kubeletconfigv1beta1.KubeletConfiguration objects
// to and from *extensionsv1alpha1.FileContentInline.
type ConfigCodec interface {
// Encode encodes the given *kubeletconfigv1beta1.KubeletConfiguration into a *extensionsv1alpha1.FileContentInline.
Encode(*kubeletconfigv1beta1.KubeletConfiguration, string) (*extensionsv1alpha1.FileContentInline, error)
// Decode decodes a *kubeletconfigv1beta1.KubeletConfiguration from the given *extensionsv1alpha1.FileContentInline.
Decode(*extensionsv1alpha1.FileContentInline) (*kubeletconfigv1beta1.KubeletConfiguration, error)
}
var scheme *runtime.Scheme
func init() {
// Create and initialize scheme
scheme = runtime.NewScheme()
utilruntime.Must(kubeletconfigv1beta1.AddToScheme(scheme))
}
// NewConfigCodec creates an returns a new ConfigCodec.
func NewConfigCodec(fciCodec oscutils.FileContentInlineCodec) ConfigCodec {
// Create codec for encoding / decoding to and from YAML
ser := json.NewSerializerWithOptions(json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{Yaml: true, Pretty: false, Strict: false})
versions := schema.GroupVersions([]schema.GroupVersion{kubeletconfigv1beta1.SchemeGroupVersion})
codec := serializer.NewCodecFactory(scheme).CodecForVersions(ser, ser, versions, versions)
return &configCodec{
fciCodec: fciCodec,
codec: codec,
}
}
type configCodec struct {
fciCodec oscutils.FileContentInlineCodec
codec runtime.Codec
}
// Encode encodes the given *kubeletconfigv1beta1.KubeletConfiguration into a *extensionsv1alpha1.FileContentInline.
func (c *configCodec) Encode(kubeletConfig *kubeletconfigv1beta1.KubeletConfiguration, encoding string) (*extensionsv1alpha1.FileContentInline, error) {
// Encode kubelet configuration to YAML
data, err := runtime.Encode(c.codec, kubeletConfig)
if err != nil {
return nil, fmt.Errorf("could not encode kubelet configuration to YAML: %w", err)
}
fci, err := c.fciCodec.Encode(data, encoding)
if err != nil {
return nil, fmt.Errorf("could not encode kubelet config file content data: %w", err)
}
return fci, nil
}
// Decode decodes a *kubeletconfigv1beta1.KubeletConfiguration from the given *extensionsv1alpha1.FileContentInline.
func (c *configCodec) Decode(fci *extensionsv1alpha1.FileContentInline) (*kubeletconfigv1beta1.KubeletConfiguration, error) {
data, err := c.fciCodec.Decode(fci)
if err != nil {
return nil, fmt.Errorf("could not decode kubelet config file content data: %w", err)
}
// Decode kubelet configuration from YAML
kubeletConfig := &kubeletconfigv1beta1.KubeletConfiguration{}
if err := runtime.DecodeInto(c.codec, data, kubeletConfig); err != nil {
return nil, fmt.Errorf("could not decode kubelet configuration from YAML: %w", err)
}
return kubeletConfig, nil
}