| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package redis |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "context" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "regexp" |
| 11 | "strings" |
| 12 | |
| 13 | "github.com/blang/semver/v4" |
| 14 | ) |
| 15 | |
| 16 | const precision = 1000 // float values multiplier and dimensions divisor |
| 17 | |
| 18 | func (c *Collector) collect() (map[string]int64, error) { |
| 19 | info, err := c.rdb.Info(context.Background(), "all").Result() |
| 20 | if err != nil { |
| 21 | return nil, err |
| 22 | } |
| 23 | |
| 24 | if c.server == "" { |
| 25 | s, v, err := extractServerVersion(info) |
| 26 | if err != nil { |
| 27 | return nil, fmt.Errorf("can not extract server app and version: %v", err) |
| 28 | } |
| 29 | c.server, c.version = s, v |
| 30 | c.Debugf(`server="%s",version="%s"`, s, v) |
| 31 | } |
| 32 | |
| 33 | if c.server != "redis" { |
| 34 | return nil, fmt.Errorf("unsupported server app, want=redis, got=%s", c.server) |
| 35 | } |
| 36 | |
| 37 | mx := make(map[string]int64) |
| 38 | c.collectInfo(mx, info) |
| 39 | c.collectPingLatency(mx) |
| 40 | |
| 41 | return mx, nil |
| 42 | } |
| 43 | |
| 44 | // redis_version:6.0.9 |
| 45 | var reVersion = regexp.MustCompile(`([a-z]+)_version:(\d+\.\d+\.\d+)`) |
| 46 | |
| 47 | func extractServerVersion(info string) (string, *semver.Version, error) { |
| 48 | var versionLine string |
| 49 | for sc := bufio.NewScanner(strings.NewReader(info)); sc.Scan(); { |
| 50 | line := sc.Text() |
| 51 | if strings.Contains(line, "_version") { |
| 52 | versionLine = strings.TrimSpace(line) |
| 53 | break |
| 54 | } |
| 55 | } |
| 56 | if versionLine == "" { |
| 57 | return "", nil, errors.New("no version property") |
| 58 | } |
| 59 | |
| 60 | match := reVersion.FindStringSubmatch(versionLine) |
| 61 | if match == nil { |
| 62 | return "", nil, fmt.Errorf("can not parse version property '%s'", versionLine) |
| 63 | } |
| 64 | |
| 65 | server, version := match[1], match[2] |
| 66 | ver, err := semver.New(version) |
| 67 | if err != nil { |
| 68 | return "", nil, err |
| 69 | } |
| 70 | |
| 71 | return server, ver, nil |
| 72 | } |