prometheus/retrieval/relabel.go

package retrieval

import (
	"crypto/md5"
	"fmt"
	"strings"

	clientmodel "github.com/prometheus/client_golang/model"

	"github.com/prometheus/prometheus/config"
)

// Relabel returns a relabeled copy of the given label set. The relabel configurations
// are applied in order of input.
// If a label set is dropped, nil is returned.
func Relabel(labels clientmodel.LabelSet, cfgs ...*config.RelabelConfig) (clientmodel.LabelSet, error) {
	out := clientmodel.LabelSet{}
	for ln, lv := range labels {
		out[ln] = lv
	}
	var err error
	for _, cfg := range cfgs {
		if out, err = relabel(out, cfg); err != nil {
			return nil, err
		}
		if out == nil {
			return nil, nil
		}
	}
	return out, nil
}

func relabel(labels clientmodel.LabelSet, cfg *config.RelabelConfig) (clientmodel.LabelSet, error) {
	values := make([]string, 0, len(cfg.SourceLabels))
	for _, ln := range cfg.SourceLabels {
		values = append(values, string(labels[ln]))
	}
	val := strings.Join(values, cfg.Separator)

	switch cfg.Action {
	case config.RelabelDrop:
		if cfg.Regex.MatchString(val) {
			return nil, nil
		}
	case config.RelabelKeep:
		if !cfg.Regex.MatchString(val) {
			return nil, nil
		}
	case config.RelabelReplace:
		// If there is no match no replacement must take place.
		if !cfg.Regex.MatchString(val) {
			break
		}
		res := cfg.Regex.ReplaceAllString(val, cfg.Replacement)
		if res == "" {
			delete(labels, cfg.TargetLabel)
		} else {
			labels[cfg.TargetLabel] = clientmodel.LabelValue(res)
		}
	case config.RelabelHashMod:
		mod := sum64(md5.Sum([]byte(val))) % cfg.Modulus
		labels[cfg.TargetLabel] = clientmodel.LabelValue(fmt.Sprintf("%d", mod))
	default:
		panic(fmt.Errorf("retrieval.relabel: unknown relabel action type %q", cfg.Action))
	}
	return labels, nil
}

// sum64 sums the md5 hash to an uint64.
func sum64(hash [md5.Size]byte) uint64 {
	var s uint64

	for i, b := range hash {
		shift := uint64((md5.Size - i - 1) * 8)

		s |= uint64(b) << shift
	}
	return s
}