| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package dovecot |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "bytes" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "strconv" |
| 11 | "strings" |
| 12 | ) |
| 13 | |
| 14 | // FIXME: drop using "old_stats" in favour of "stats" (https://doc.dovecot.org/configuration_manual/stats/openmetrics/). |
| 15 | |
| 16 | func (c *Collector) collect() (map[string]int64, error) { |
| 17 | if c.conn == nil { |
| 18 | conn, err := c.establishConn() |
| 19 | if err != nil { |
| 20 | return nil, err |
| 21 | } |
| 22 | c.conn = conn |
| 23 | } |
| 24 | |
| 25 | stats, err := c.conn.queryExportGlobal() |
| 26 | if err != nil { |
| 27 | c.conn.disconnect() |
| 28 | c.conn = nil |
| 29 | return nil, err |
| 30 | } |
| 31 | |
| 32 | mx := make(map[string]int64) |
| 33 | |
| 34 | // https://doc.dovecot.org/configuration_manual/stats/old_statistics/#statistics-gathered |
| 35 | if err := c.collectExportGlobal(mx, stats); err != nil { |
| 36 | return nil, err |
| 37 | } |
| 38 | |
| 39 | return mx, nil |
| 40 | } |
| 41 | |
| 42 | func (c *Collector) collectExportGlobal(mx map[string]int64, resp []byte) error { |
| 43 | sc := bufio.NewScanner(bytes.NewReader(resp)) |
| 44 | |
| 45 | if !sc.Scan() { |
| 46 | return errors.New("failed to read fields line from export global response") |
| 47 | } |
| 48 | fieldsLine := strings.TrimSpace(sc.Text()) |
| 49 | |
| 50 | if !sc.Scan() { |
| 51 | return errors.New("failed to read values line from export global response") |
| 52 | } |
| 53 | valuesLine := strings.TrimSpace(sc.Text()) |
| 54 | |
| 55 | if fieldsLine == "" || valuesLine == "" { |
| 56 | return errors.New("empty fields line or values line from export global response") |
| 57 | } |
| 58 | |
| 59 | fields := strings.Fields(fieldsLine) |
| 60 | values := strings.Fields(valuesLine) |
| 61 | |
| 62 | if len(fields) != len(values) { |
| 63 | return fmt.Errorf("mismatched fields and values count: fields=%d, values=%d", len(fields), len(values)) |
| 64 | } |
| 65 | |
| 66 | for i, name := range fields { |
| 67 | val := values[i] |
| 68 | |
| 69 | v, err := strconv.ParseInt(val, 10, 64) |
| 70 | if err != nil { |
| 71 | c.Debugf("failed to parse export value %s %s: %v", name, val, err) |
| 72 | continue |
| 73 | } |
| 74 | |
| 75 | mx[name] = v |
| 76 | } |
| 77 | |
| 78 | return nil |
| 79 | } |
| 80 | |
| 81 | func (c *Collector) establishConn() (dovecotConn, error) { |
| 82 | conn := c.newConn(c.Config) |
| 83 | |
| 84 | if err := conn.connect(); err != nil { |
| 85 | return nil, err |
| 86 | } |
| 87 | |
| 88 | return conn, nil |
| 89 | } |