mirror of
https://github.com/prometheus-operator/prometheus-operator.git
synced 2025-04-16 09:16:38 +00:00
115 lines
3.5 KiB
Go
115 lines
3.5 KiB
Go
// Copyright 2020 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 namespacelabeler
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import (
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monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
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"k8s.io/apimachinery/pkg/util/intstr"
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"github.com/pkg/errors"
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"github.com/prometheus-community/prom-label-proxy/injectproxy"
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"github.com/prometheus/prometheus/pkg/labels"
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"github.com/prometheus/prometheus/promql/parser"
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)
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// Labeler enables to enforce adding namespace labels to PrometheusRules and to metrics used in them
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type Labeler struct {
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enforcedNsLabel string
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prometheusRuleLabeler bool
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excludeList map[string]map[string]struct{}
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}
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// New - creates new Labeler
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// enforcedNsLabel - label name to be enforced for namespace
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// excludeConfig - list of namespace + PrometheusRule names to be excluded while enforcing adding namespace label
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func New(enforcedNsLabel string, excludeConfig []monitoringv1.PrometheusRuleExcludeConfig, prometheusRuleLabeler bool) *Labeler {
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if enforcedNsLabel == "" {
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return &Labeler{} // no-op labeler
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}
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if len(excludeConfig) == 0 {
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return &Labeler{enforcedNsLabel: enforcedNsLabel}
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}
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ruleExcludeList := make(map[string]map[string]struct{})
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for _, r := range excludeConfig {
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if r.RuleNamespace == "" || r.RuleName == "" {
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continue
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}
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if _, ok := ruleExcludeList[r.RuleNamespace]; !ok {
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ruleExcludeList[r.RuleNamespace] = make(map[string]struct{})
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}
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ruleExcludeList[r.RuleNamespace][r.RuleName] = struct{}{}
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}
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return &Labeler{
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excludeList: ruleExcludeList,
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enforcedNsLabel: enforcedNsLabel,
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prometheusRuleLabeler: prometheusRuleLabeler,
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}
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}
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func (l *Labeler) isExcludedRule(namespace, name string) bool {
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if l.excludeList == nil {
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return false
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}
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nsRules, ok := l.excludeList[namespace]
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if !ok {
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return false
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}
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_, ok = nsRules[name]
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return ok
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}
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// EnforceNamespaceLabel - adds(or modifies) namespace label to promRule labels with specified namespace
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// and also adds namespace label to all the metrics used in promRule
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func (l *Labeler) EnforceNamespaceLabel(rule *monitoringv1.PrometheusRule) error {
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if l.enforcedNsLabel == "" || l.isExcludedRule(rule.Namespace, rule.Name) {
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return nil
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}
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for gi, group := range rule.Spec.Groups {
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if l.prometheusRuleLabeler {
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group.PartialResponseStrategy = ""
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}
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for ri, r := range group.Rules {
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if len(rule.Spec.Groups[gi].Rules[ri].Labels) == 0 {
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rule.Spec.Groups[gi].Rules[ri].Labels = map[string]string{}
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}
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rule.Spec.Groups[gi].Rules[ri].Labels[l.enforcedNsLabel] = rule.Namespace
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expr := r.Expr.String()
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parsedExpr, err := parser.ParseExpr(expr)
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if err != nil {
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return errors.Wrap(err, "failed to parse promql expression")
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}
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err = injectproxy.SetRecursive(parsedExpr, []*labels.Matcher{{
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Name: l.enforcedNsLabel,
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Type: labels.MatchEqual,
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Value: rule.Namespace,
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}})
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if err != nil {
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return errors.Wrap(err, "failed to inject labels to expression")
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}
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rule.Spec.Groups[gi].Rules[ri].Expr = intstr.FromString(parsedExpr.String())
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}
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}
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return nil
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}
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