mirror of
https://github.com/prometheus-operator/prometheus-operator.git
synced 2025-04-16 09:16:38 +00:00
132 lines
3.8 KiB
Go
132 lines
3.8 KiB
Go
// Copyright 2018 The prometheus-operator Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package main
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import (
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"bytes"
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"flag"
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"log"
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"os"
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"path"
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"path/filepath"
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monitoring "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring"
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monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
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"github.com/prometheus-operator/prometheus-operator/pkg/versionutil"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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k8sYAML "k8s.io/apimachinery/pkg/util/yaml"
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"github.com/ghodss/yaml"
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"github.com/pkg/errors"
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)
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func main() {
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versionutil.RegisterFlags()
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var ruleConfigMapName = flag.String("rule-config-map", "", "path to rule ConfigMap")
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var ruleCRDSDestination = flag.String("rule-crds-destination", "", "destination new crds should be created in")
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flag.Parse()
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if versionutil.ShouldPrintVersion() {
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versionutil.Print(os.Stdout, "po-rule-migration")
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os.Exit(0)
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}
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if *ruleConfigMapName == "" {
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log.Print("please specify 'rule-config-map' flag")
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flag.PrintDefaults()
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os.Exit(1)
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}
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if *ruleCRDSDestination == "" {
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log.Print("please specify 'rule-crds-destination' flag")
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flag.PrintDefaults()
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os.Exit(1)
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}
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destPath, err := filepath.Abs(*ruleCRDSDestination)
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if err != nil {
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log.Fatalf("failed to get absolute path of '%v': %v", ruleCRDSDestination, err.Error())
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}
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ruleCRDSDestination = &destPath
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file, err := os.Open(*ruleConfigMapName)
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if err != nil {
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log.Fatalf("failed to read file '%v': %v", ruleConfigMapName, err.Error())
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}
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configMap := v1.ConfigMap{}
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err = k8sYAML.NewYAMLOrJSONDecoder(file, 100).Decode(&configMap)
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if err != nil {
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log.Fatalf("failed to decode manifest: %v", err.Error())
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}
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ruleFiles, err := CMToRule(&configMap)
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if err != nil {
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log.Fatalf("failed to transform ConfigMap to rule file crds: %v", err.Error())
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}
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for _, ruleFile := range ruleFiles {
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encodedRuleFile, err := yaml.Marshal(ruleFile)
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if err != nil {
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log.Fatalf("failed to encode ruleFile '%v': %v", ruleFile.Name, err.Error())
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}
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err = os.WriteFile(path.Join(*ruleCRDSDestination, ruleFile.Name), encodedRuleFile, 0644)
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if err != nil {
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log.Fatalf("failed to write yaml manifest for rule file '%v': %v", ruleFile.Name, err.Error())
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}
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}
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}
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// CMToRule takes a rule ConfigMap and transforms it to possibly multiple
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// rule file crds. It is used in `cmd/po-rule-cm-to-rule-file-crds`. Thereby it
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// needs to be public.
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func CMToRule(cm *v1.ConfigMap) ([]monitoringv1.PrometheusRule, error) {
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rules := []monitoringv1.PrometheusRule{}
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for name, content := range cm.Data {
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ruleSpec := monitoringv1.PrometheusRuleSpec{}
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if err := k8sYAML.NewYAMLOrJSONDecoder(bytes.NewBufferString(content), 1000).Decode(&ruleSpec); err != nil {
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return []monitoringv1.PrometheusRule{}, errors.Wrapf(
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err,
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"unmarshal rules file %v in configmap '%v' in namespace '%v'",
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name, cm.Name, cm.Namespace,
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)
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}
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rule := monitoringv1.PrometheusRule{
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TypeMeta: metav1.TypeMeta{
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Kind: monitoringv1.PrometheusRuleKind,
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APIVersion: monitoring.GroupName + "/" + monitoringv1.Version,
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: cm.Name + "-" + name,
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Namespace: cm.Namespace,
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Labels: cm.Labels,
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},
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Spec: ruleSpec,
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}
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rules = append(rules, rule)
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}
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return rules, nil
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}
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