| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package prometheus |
| 4 | |
| 5 | import "github.com/prometheus/prometheus/model/labels" |
| 6 | |
| 7 | func copyLabels(lbs []labels.Label) []labels.Label { |
| 8 | return append([]labels.Label(nil), lbs...) |
| 9 | } |
| 10 | |
| 11 | // copyLabelsWithoutName returns a fresh copy of lbs with __name__ removed. In the |
| 12 | // common case __name__ sorts first (it precedes lowercase label names), so the |
| 13 | // remainder is contiguous and copied directly; otherwise a rare label that sorts |
| 14 | // before __name__ (e.g. "UUID") is skipped element by element. |
| 15 | func copyLabelsWithoutName(lbs labels.Labels) labels.Labels { |
| 16 | if len(lbs) > 0 && lbs[0].Name == labels.MetricName { |
| 17 | return copyLabels(lbs[1:]) |
| 18 | } |
| 19 | out := make([]labels.Label, 0, len(lbs)) |
| 20 | for _, lb := range lbs { |
| 21 | if lb.Name == labels.MetricName { |
| 22 | continue |
| 23 | } |
| 24 | out = append(out, lb) |
| 25 | } |
| 26 | return out |
| 27 | } |
| 28 | |
| 29 | func removeLabel(lbs labels.Labels, name string) (labels.Labels, string, bool) { |
| 30 | for i, v := range lbs { |
| 31 | if v.Name == name { |
| 32 | return append(lbs[:i], lbs[i+1:]...), v.Value, true |
| 33 | } |
| 34 | } |
| 35 | return lbs, "", false |
| 36 | } |
| 37 | |
| 38 | func metricNameValue(lbs labels.Labels) (string, bool) { |
| 39 | for _, v := range lbs { |
| 40 | if v.Name == labels.MetricName { |
| 41 | return v.Value, true |
| 42 | } |
| 43 | } |
| 44 | return "", false |
| 45 | } |