102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
/*
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Copyright 2024 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 kuberc
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"os"
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"k8s.io/klog/v2"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilyaml "k8s.io/apimachinery/pkg/util/yaml"
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"k8s.io/kubectl/pkg/config"
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)
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// decodePreference iterates over the yamls in kuberc file to find the supported kuberc version.
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// Once it finds, it returns the compatible kuberc object as well as accumulated errors during the iteration.
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func decodePreference(kubercFile string) (*config.Preference, error) {
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kubercBytes, err := os.ReadFile(kubercFile)
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if err != nil {
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return nil, err
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}
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attemptedItems := 0
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reader := utilyaml.NewYAMLReader(bufio.NewReader(bytes.NewBuffer(kubercBytes)))
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for {
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doc, readErr := reader.Read()
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if errors.Is(readErr, io.EOF) {
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// no more entries, expected when we reach the end of the file
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break
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}
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if readErr != nil {
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// other errors are fatal
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return nil, readErr
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}
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if len(bytes.TrimSpace(doc)) == 0 {
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// empty item, ignore
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continue
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}
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// remember we attempted
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attemptedItems++
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pref, gvk, strictDecodeErr := strictCodecs.UniversalDecoder().Decode(doc, nil, nil)
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if strictDecodeErr != nil {
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var lenientDecodeErr error
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pref, gvk, lenientDecodeErr = lenientCodecs.UniversalDecoder().Decode(doc, nil, nil)
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if lenientDecodeErr != nil {
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// both strict and lenient failed
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// verbose log the error with the most information about this item and continue
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klog.V(5).Infof("kuberc: strict decoding error for entry %d in %s: %v", attemptedItems, kubercFile, strictDecodeErr)
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continue
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}
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}
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// check expected GVK, if bad, verbose log and continue
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expectedGK := schema.GroupKind{
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Group: config.SchemeGroupVersion.Group,
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Kind: "Preference",
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}
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if gvk.GroupKind() != expectedGK {
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klog.V(5).Infof("kuberc: unexpected GroupVersionKind for entry %d in %s: %v", attemptedItems, kubercFile, gvk)
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continue
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}
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// check expected go type, if bad, verbose log and continue
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preferences, ok := pref.(*config.Preference)
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if !ok {
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klog.V(5).Infof("kuberc: unexpected object type %T for entry %d in %s", pref, attemptedItems, kubercFile)
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continue
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}
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// we have a usable preferences to return
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klog.V(5).Infof("kuberc: successfully decoded entry %d in %s", attemptedItems, kubercFile)
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return preferences, strictDecodeErr
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}
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if attemptedItems > 0 {
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return nil, fmt.Errorf("no valid preferences found in %s, use --v=5 to see details", kubercFile)
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}
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// empty doc
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klog.V(5).Infof("kuberc: no preferences found in %s", kubercFile)
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return nil, nil
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}
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