443d58e40a
Alpha implementation of the Dynamic Kubelet Configuration feature. See the proposal doc in #29459.
78 lines
3.0 KiB
Go
78 lines
3.0 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/apimachinery/pkg/runtime"
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"k8s.io/kubernetes/pkg/api"
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// ensure the core apis are installed
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_ "k8s.io/kubernetes/pkg/api/install"
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"k8s.io/kubernetes/pkg/apis/componentconfig"
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// ensure the componentconfig api group is installed
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_ "k8s.io/kubernetes/pkg/apis/componentconfig/install"
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ccv1a1 "k8s.io/kubernetes/pkg/apis/componentconfig/v1alpha1"
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)
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// TODO(mtaufen): allow an encoder to be injected into checkpoint objects at creation time? (then we could ultimately instantiate only one encoder)
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// NewJSONEncoder generates a new runtime.Encoder that encodes objects to JSON
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func NewJSONEncoder(groupName string) (runtime.Encoder, error) {
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// encode to json
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mediaType := "application/json"
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info, ok := runtime.SerializerInfoForMediaType(api.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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versions := api.Registry.EnabledVersionsForGroup(groupName)
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if len(versions) == 0 {
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return nil, fmt.Errorf("no enabled versions for group %q", groupName)
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}
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// the "best" version supposedly comes first in the list returned from api.Registry.EnabledVersionsForGroup
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return api.Codecs.EncoderForVersion(info.Serializer, versions[0]), nil
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}
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// DecodeKubeletConfiguration decodes an encoded (v1alpha1) KubeletConfiguration object to the internal type
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func DecodeKubeletConfiguration(data []byte) (*componentconfig.KubeletConfiguration, error) {
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// TODO(mtaufen): when KubeletConfiguration moves out of componentconfig, will the UniversalDecoder still work?
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// decode the object, note we use the external version scheme to decode, because users provide the external version
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obj, err := runtime.Decode(api.Codecs.UniversalDecoder(ccv1a1.SchemeGroupVersion), data)
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if err != nil {
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return nil, fmt.Errorf("failed to decode, error: %v", err)
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}
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externalKC, ok := obj.(*ccv1a1.KubeletConfiguration)
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if !ok {
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return nil, fmt.Errorf("failed to cast object to KubeletConfiguration, object: %#v", obj)
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}
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// TODO(mtaufen): confirm whether api.Codecs.UniversalDecoder runs the defaulting, which would make this redundant
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// run the defaulter on the decoded configuration before converting to internal type
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api.Scheme.Default(externalKC)
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// convert to internal type
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internalKC := &componentconfig.KubeletConfiguration{}
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err = api.Scheme.Convert(externalKC, internalKC, nil)
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if err != nil {
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return nil, err
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}
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return internalKC, nil
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}
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