82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors All rights reserved.
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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 metrics
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import (
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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"k8s.io/kube-state-metrics/pkg/options"
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)
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type gathererFunc func() ([]*dto.MetricFamily, error)
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func (f gathererFunc) Gather() ([]*dto.MetricFamily, error) {
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return f()
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}
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// FilteredGatherer wraps a prometheus.Gatherer to filter metrics based on a
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// white or blacklist. Whitelist and blacklist are mutually exclusive.
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func FilteredGatherer(r prometheus.Gatherer, whitelist options.MetricSet, blacklist options.MetricSet) prometheus.Gatherer {
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whitelistEnabled := !whitelist.IsEmpty()
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blacklistEnabled := !blacklist.IsEmpty()
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if whitelistEnabled {
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return gathererFunc(func() ([]*dto.MetricFamily, error) {
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metricFamilies, err := r.Gather()
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if err != nil {
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return nil, err
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}
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newMetricFamilies := []*dto.MetricFamily{}
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for _, metricFamily := range metricFamilies {
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// deferencing this string may be a performance bottleneck
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name := *metricFamily.Name
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_, onWhitelist := whitelist[name]
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if onWhitelist {
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newMetricFamilies = append(newMetricFamilies, metricFamily)
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}
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}
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return newMetricFamilies, nil
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})
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}
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if blacklistEnabled {
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return gathererFunc(func() ([]*dto.MetricFamily, error) {
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metricFamilies, err := r.Gather()
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if err != nil {
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return nil, err
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}
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newMetricFamilies := []*dto.MetricFamily{}
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for _, metricFamily := range metricFamilies {
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name := *metricFamily.Name
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_, onBlacklist := blacklist[name]
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if onBlacklist {
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continue
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}
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newMetricFamilies = append(newMetricFamilies, metricFamily)
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}
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return newMetricFamilies, nil
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})
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}
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return r
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}
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