b15aba547a
This implements a lenient path for decoding a kube-scheduler config file. The config file gets decoded with a strict serializer first, if that fails a lenient CodecFactory that has just v1alpha1 registered into it is used for decoding. The lenient path is to be dropped when support for v1alpha1 is dropped. For more information on the discussion see #82924 and the linked PRs.
92 lines
2.9 KiB
Go
92 lines
2.9 KiB
Go
/*
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Copyright 2018 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 options
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import (
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"fmt"
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"io/ioutil"
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"os"
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"k8s.io/klog"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/component-base/codec"
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kubeschedulerconfig "k8s.io/kubernetes/pkg/scheduler/apis/config"
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kubeschedulerscheme "k8s.io/kubernetes/pkg/scheduler/apis/config/scheme"
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kubeschedulerconfigv1alpha1 "k8s.io/kubernetes/pkg/scheduler/apis/config/v1alpha1"
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)
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func loadConfigFromFile(file string) (*kubeschedulerconfig.KubeSchedulerConfiguration, error) {
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data, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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return loadConfig(data)
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}
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func loadConfig(data []byte) (*kubeschedulerconfig.KubeSchedulerConfiguration, error) {
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configObj := &kubeschedulerconfig.KubeSchedulerConfiguration{}
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// The UniversalDecoder runs defaulting and returns the internal type by default.
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err := runtime.DecodeInto(kubeschedulerscheme.Codecs.UniversalDecoder(), data, configObj)
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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 v1alpha1 registered, and log a warning.
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// The lenient path is to be dropped when support for v1alpha1 is dropped.
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if !runtime.IsStrictDecodingError(err) {
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return nil, err
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}
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var lenientErr error
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_, lenientCodecs, lenientErr := codec.NewLenientSchemeAndCodecs(
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kubeschedulerconfig.AddToScheme,
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kubeschedulerconfigv1alpha1.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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if lenientErr = runtime.DecodeInto(lenientCodecs.UniversalDecoder(), data, configObj); lenientErr != nil {
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return nil, fmt.Errorf("failed lenient decoding: %v", err)
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}
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klog.Warningf("using lenient decoding as strict decoding failed: %v", err)
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}
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return configObj, nil
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}
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// WriteConfigFile writes the config into the given file name as YAML.
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func WriteConfigFile(fileName string, cfg *kubeschedulerconfig.KubeSchedulerConfiguration) error {
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const mediaType = runtime.ContentTypeYAML
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info, ok := runtime.SerializerInfoForMediaType(kubeschedulerscheme.Codecs.SupportedMediaTypes(), mediaType)
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if !ok {
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return fmt.Errorf("unable to locate encoder -- %q is not a supported media type", mediaType)
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}
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encoder := kubeschedulerscheme.Codecs.EncoderForVersion(info.Serializer, kubeschedulerconfigv1alpha1.SchemeGroupVersion)
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configFile, err := os.Create(fileName)
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if err != nil {
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return err
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}
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defer configFile.Close()
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if err := encoder.Encode(cfg, configFile); err != nil {
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return err
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}
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return nil
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}
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