mirror of
https://github.com/prometheus/prometheus.git
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116 lines
3 KiB
Go
116 lines
3 KiB
Go
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// Copyright 2015 The Prometheus 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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//
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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 relabel
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import (
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"crypto/md5"
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"fmt"
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"strings"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/pkg/labels"
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)
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// Process returns a relabeled copy of the given label set. The relabel configurations
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// are applied in order of input.
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// If a label set is dropped, nil is returned.
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// May return the input labelSet modified.
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func Process(labels labels.Labels, cfgs ...*config.RelabelConfig) labels.Labels {
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for _, cfg := range cfgs {
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labels = relabel(labels, cfg)
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if labels == nil {
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return nil
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}
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}
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return labels
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}
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func relabel(lset labels.Labels, cfg *config.RelabelConfig) labels.Labels {
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values := make([]string, 0, len(cfg.SourceLabels))
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for _, ln := range cfg.SourceLabels {
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values = append(values, lset.Get(string(ln)))
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}
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val := strings.Join(values, cfg.Separator)
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lb := labels.NewBuilder(lset)
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switch cfg.Action {
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case config.RelabelDrop:
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if cfg.Regex.MatchString(val) {
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return nil
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}
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case config.RelabelKeep:
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if !cfg.Regex.MatchString(val) {
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return nil
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}
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case config.RelabelReplace:
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indexes := cfg.Regex.FindStringSubmatchIndex(val)
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// If there is no match no replacement must take place.
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if indexes == nil {
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break
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}
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target := model.LabelName(cfg.Regex.ExpandString([]byte{}, cfg.TargetLabel, val, indexes))
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if !target.IsValid() {
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lb.Del(cfg.TargetLabel)
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break
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}
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res := cfg.Regex.ExpandString([]byte{}, cfg.Replacement, val, indexes)
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if len(res) == 0 {
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lb.Del(cfg.TargetLabel)
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break
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}
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lb.Set(string(target), string(res))
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case config.RelabelHashMod:
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mod := sum64(md5.Sum([]byte(val))) % cfg.Modulus
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lb.Set(cfg.TargetLabel, fmt.Sprintf("%d", mod))
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case config.RelabelLabelMap:
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for _, l := range lset {
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if cfg.Regex.MatchString(l.Name) {
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res := cfg.Regex.ReplaceAllString(l.Name, cfg.Replacement)
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lb.Set(res, l.Value)
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}
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}
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case config.RelabelLabelDrop:
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for _, l := range lset {
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if cfg.Regex.MatchString(l.Name) {
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lb.Del(l.Name)
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}
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}
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case config.RelabelLabelKeep:
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for _, l := range lset {
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if !cfg.Regex.MatchString(l.Name) {
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lb.Del(l.Name)
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}
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}
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default:
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panic(fmt.Errorf("retrieval.relabel: unknown relabel action type %q", cfg.Action))
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}
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return lb.Labels()
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}
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// sum64 sums the md5 hash to an uint64.
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func sum64(hash [md5.Size]byte) uint64 {
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var s uint64
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for i, b := range hash {
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shift := uint64((md5.Size - i - 1) * 8)
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s |= uint64(b) << shift
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}
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return s
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}
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