107 lines
3.6 KiB
Go
107 lines
3.6 KiB
Go
/*
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Copyright 2024 The Karmada 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 config
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import (
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"fmt"
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"os"
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"sort"
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"k8s.io/apimachinery/pkg/runtime/schema"
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yamlserializer "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
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"k8s.io/apimachinery/pkg/util/yaml"
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"k8s.io/klog/v2"
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)
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// LoadInitConfiguration loads the InitConfiguration from the specified file path.
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// It delegates the actual loading to the loadInitConfigurationFromFile function.
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func LoadInitConfiguration(cfgPath string) (*KarmadaInitConfig, error) {
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var config *KarmadaInitConfig
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var err error
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config, err = loadInitConfigurationFromFile(cfgPath)
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return config, err
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}
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// loadInitConfigurationFromFile reads the file at the specified path and converts it into an InitConfiguration.
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// It reads the file contents and then converts the bytes to an InitConfiguration.
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func loadInitConfigurationFromFile(cfgPath string) (*KarmadaInitConfig, error) {
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klog.V(1).Infof("loading configuration from %q", cfgPath)
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b, err := os.ReadFile(cfgPath)
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if err != nil {
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return nil, fmt.Errorf("unable to read config from %q: %v", cfgPath, err)
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}
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gvkmap, err := ParseGVKYamlMap(b)
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if err != nil {
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return nil, err
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}
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return documentMapToInitConfiguration(gvkmap)
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}
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// ParseGVKYamlMap parses a single YAML document into a map of GroupVersionKind to byte slices.
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// This function is a simplified version that handles only a single YAML document.
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func ParseGVKYamlMap(yamlBytes []byte) (map[schema.GroupVersionKind][]byte, error) {
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gvkmap := make(map[schema.GroupVersionKind][]byte)
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gvk, err := yamlserializer.DefaultMetaFactory.Interpret(yamlBytes)
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if err != nil {
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return nil, fmt.Errorf("failed to interpret YAML document: %w", err)
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}
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if len(gvk.Group) == 0 || len(gvk.Version) == 0 || len(gvk.Kind) == 0 {
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return nil, fmt.Errorf("invalid configuration for GroupVersionKind %+v: kind and apiVersion is mandatory information that must be specified", gvk)
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}
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gvkmap[*gvk] = yamlBytes
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return gvkmap, nil
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}
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// documentMapToInitConfiguration processes a map of GroupVersionKind to byte slices to extract the InitConfiguration.
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// It iterates over the map, checking for the "InitConfiguration" kind, group, and version, and unmarshals its content into an InitConfiguration object.
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func documentMapToInitConfiguration(gvkmap map[schema.GroupVersionKind][]byte) (*KarmadaInitConfig, error) {
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var initcfg *KarmadaInitConfig
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gvks := make([]schema.GroupVersionKind, 0, len(gvkmap))
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for gvk := range gvkmap {
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gvks = append(gvks, gvk)
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}
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sort.Slice(gvks, func(i, j int) bool {
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return gvks[i].String() < gvks[j].String()
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})
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for _, gvk := range gvks {
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fileContent := gvkmap[gvk]
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if gvk.Kind == "KarmadaInitConfig" {
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if gvk.Group != GroupName || gvk.Version != SchemeGroupVersion.Version {
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return nil, fmt.Errorf("invalid Group or Version: expected group %q and version %q, but got group %q and version %q", GroupName, SchemeGroupVersion.Version, gvk.Group, gvk.Version)
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}
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initcfg = &KarmadaInitConfig{}
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if err := yaml.Unmarshal(fileContent, initcfg); err != nil {
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return nil, err
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}
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}
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}
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if initcfg == nil {
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return nil, fmt.Errorf("no KarmadaInitConfig kind was found in the YAML file")
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}
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return initcfg, nil
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}
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