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62c8337e77
Adapted top dir relabel to use pkg relabel structs. Removal of this in a separate tracked here: https://github.com/prometheus/prometheus/issues/3647 Signed-off-by: Bartek Plotka <bwplotka@gmail.com>
120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
// 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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pkgrelabel "github.com/prometheus/prometheus/pkg/relabel"
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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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// TODO(https://github.com/prometheus/prometheus/issues/3647): Get rid of this package in favor of pkg/relabel
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// once usage of `model.LabelSet` is removed.
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func Process(labels model.LabelSet, cfgs ...*pkgrelabel.Config) model.LabelSet {
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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(labels model.LabelSet, cfg *pkgrelabel.Config) model.LabelSet {
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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, string(labels[ln]))
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}
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val := strings.Join(values, cfg.Separator)
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switch cfg.Action {
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case pkgrelabel.Drop:
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if cfg.Regex.MatchString(val) {
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return nil
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}
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case pkgrelabel.Keep:
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if !cfg.Regex.MatchString(val) {
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return nil
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}
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case pkgrelabel.Replace:
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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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delete(labels, model.LabelName(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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delete(labels, model.LabelName(cfg.TargetLabel))
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break
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}
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labels[target] = model.LabelValue(res)
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case pkgrelabel.HashMod:
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mod := sum64(md5.Sum([]byte(val))) % cfg.Modulus
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labels[model.LabelName(cfg.TargetLabel)] = model.LabelValue(fmt.Sprintf("%d", mod))
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case pkgrelabel.LabelMap:
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out := make(model.LabelSet, len(labels))
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// Take a copy to avoid infinite loops.
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for ln, lv := range labels {
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out[ln] = lv
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}
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for ln, lv := range labels {
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if cfg.Regex.MatchString(string(ln)) {
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res := cfg.Regex.ReplaceAllString(string(ln), cfg.Replacement)
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out[model.LabelName(res)] = lv
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}
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}
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labels = out
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case pkgrelabel.LabelDrop:
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for ln := range labels {
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if cfg.Regex.MatchString(string(ln)) {
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delete(labels, ln)
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}
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}
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case pkgrelabel.LabelKeep:
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for ln := range labels {
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if !cfg.Regex.MatchString(string(ln)) {
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delete(labels, ln)
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}
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}
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default:
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panic(fmt.Errorf("relabel: unknown relabel action type %q", cfg.Action))
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}
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return 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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