| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | //go:build linux || freebsd || openbsd || netbsd || dragonfly || darwin |
| 4 | |
| 5 | package nsd |
| 6 | |
| 7 | import ( |
| 8 | "bufio" |
| 9 | "bytes" |
| 10 | "errors" |
| 11 | "strconv" |
| 12 | "strings" |
| 13 | ) |
| 14 | |
| 15 | func (c *Collector) collect() (map[string]int64, error) { |
| 16 | stats, err := c.exec.stats() |
| 17 | if err != nil { |
| 18 | return nil, err |
| 19 | } |
| 20 | |
| 21 | if len(stats) == 0 { |
| 22 | return nil, errors.New("empty stats response") |
| 23 | } |
| 24 | |
| 25 | mx := make(map[string]int64) |
| 26 | |
| 27 | sc := bufio.NewScanner(bytes.NewReader(stats)) |
| 28 | |
| 29 | for sc.Scan() { |
| 30 | c.collectStatsLine(mx, sc.Text()) |
| 31 | } |
| 32 | |
| 33 | if len(mx) == 0 { |
| 34 | return nil, errors.New("unexpected stats response: no metrics found") |
| 35 | } |
| 36 | |
| 37 | addMissingMetrics(mx, "num.rcode.", answerRcodes) |
| 38 | addMissingMetrics(mx, "num.opcode.", queryOpcodes) |
| 39 | addMissingMetrics(mx, "num.class.", queryClasses) |
| 40 | addMissingMetrics(mx, "num.type.", queryTypes) |
| 41 | |
| 42 | return mx, nil |
| 43 | } |
| 44 | |
| 45 | func (c *Collector) collectStatsLine(mx map[string]int64, line string) { |
| 46 | if line = strings.TrimSpace(line); line == "" { |
| 47 | return |
| 48 | } |
| 49 | |
| 50 | key, value, ok := strings.Cut(line, "=") |
| 51 | if !ok { |
| 52 | c.Debugf("invalid line in stats: '%s'", line) |
| 53 | return |
| 54 | } |
| 55 | |
| 56 | var v int64 |
| 57 | var f float64 |
| 58 | var err error |
| 59 | |
| 60 | switch key { |
| 61 | case "time.boot": |
| 62 | f, err = strconv.ParseFloat(value, 64) |
| 63 | v = int64(f) |
| 64 | default: |
| 65 | v, err = strconv.ParseInt(value, 10, 64) |
| 66 | } |
| 67 | |
| 68 | if err != nil { |
| 69 | c.Debugf("invalid value in stats line '%s': '%s'", line, value) |
| 70 | return |
| 71 | } |
| 72 | |
| 73 | mx[key] = v |
| 74 | } |
| 75 | |
| 76 | func addMissingMetrics(mx map[string]int64, prefix string, values []string) { |
| 77 | for _, v := range values { |
| 78 | k := prefix + v |
| 79 | if _, ok := mx[k]; !ok { |
| 80 | mx[k] = 0 |
| 81 | } |
| 82 | } |
| 83 | } |