mirror of
https://github.com/k3s-io/kubernetes.git
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108 lines
3.6 KiB
Go
108 lines
3.6 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 codec
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import (
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"fmt"
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"k8s.io/klog/v2"
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// ensure the core apis are installed
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_ "k8s.io/kubernetes/pkg/apis/core/install"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/runtime/serializer"
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"k8s.io/component-base/codec"
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kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
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"k8s.io/kubernetes/pkg/kubelet/apis/config/scheme"
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kubeletconfigv1beta1 "k8s.io/kubernetes/pkg/kubelet/apis/config/v1beta1"
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)
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// EncodeKubeletConfig encodes an internal KubeletConfiguration to an external YAML representation.
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func EncodeKubeletConfig(internal *kubeletconfig.KubeletConfiguration, targetVersion schema.GroupVersion) ([]byte, error) {
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encoder, err := NewKubeletconfigYAMLEncoder(targetVersion)
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if err != nil {
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return nil, err
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}
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// encoder will convert to external version
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data, err := runtime.Encode(encoder, internal)
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if err != nil {
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return nil, err
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}
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return data, nil
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}
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// NewKubeletconfigYAMLEncoder returns an encoder that can write objects in the kubeletconfig API group to YAML.
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func NewKubeletconfigYAMLEncoder(targetVersion schema.GroupVersion) (runtime.Encoder, error) {
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_, codecs, err := scheme.NewSchemeAndCodecs()
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if err != nil {
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return nil, err
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}
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mediaType := "application/yaml"
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info, ok := runtime.SerializerInfoForMediaType(codecs.SupportedMediaTypes(), mediaType)
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if !ok {
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return nil, fmt.Errorf("unsupported media type %q", mediaType)
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}
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return codecs.EncoderForVersion(info.Serializer, targetVersion), nil
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}
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// DecodeKubeletConfiguration decodes a serialized KubeletConfiguration to the internal type.
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func DecodeKubeletConfiguration(kubeletCodecs *serializer.CodecFactory, data []byte) (*kubeletconfig.KubeletConfiguration, error) {
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var (
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obj runtime.Object
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gvk *schema.GroupVersionKind
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)
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// The UniversalDecoder runs defaulting and returns the internal type by default.
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obj, gvk, err := kubeletCodecs.UniversalDecoder().Decode(data, nil, nil)
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if err != nil {
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// Try strict decoding first. If that fails decode with a lenient
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// decoder, which has only v1beta1 registered, and log a warning.
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// The lenient path is to be dropped when support for v1beta1 is dropped.
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if !runtime.IsStrictDecodingError(err) {
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return nil, fmt.Errorf("failed to decode: %w", err)
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}
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var lenientErr error
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_, lenientCodecs, lenientErr := codec.NewLenientSchemeAndCodecs(
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kubeletconfig.AddToScheme,
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kubeletconfigv1beta1.AddToScheme,
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)
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if lenientErr != nil {
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return nil, lenientErr
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}
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obj, gvk, lenientErr = lenientCodecs.UniversalDecoder().Decode(data, nil, nil)
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if lenientErr != nil {
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// Lenient decoding failed with the current version, return the
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// original strict error.
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return nil, fmt.Errorf("failed lenient decoding: %v", err)
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}
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// Continue with the v1beta1 object that was decoded leniently, but emit a warning.
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klog.InfoS("Using lenient decoding as strict decoding failed", "err", err)
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}
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internalKC, ok := obj.(*kubeletconfig.KubeletConfiguration)
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if !ok {
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return nil, fmt.Errorf("failed to cast object to KubeletConfiguration, unexpected type: %v", gvk)
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}
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return internalKC, nil
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}
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