| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package postfix |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "bytes" |
| 8 | "errors" |
| 9 | "fmt" |
| 10 | "strconv" |
| 11 | "strings" |
| 12 | ) |
| 13 | |
| 14 | type postqueueStats struct { |
| 15 | sizeKbyte int64 |
| 16 | requests int64 |
| 17 | } |
| 18 | |
| 19 | func (c *Collector) collect() (map[string]int64, error) { |
| 20 | bs, err := c.exec.list() |
| 21 | if err != nil { |
| 22 | return nil, err |
| 23 | } |
| 24 | |
| 25 | stats, err := parsePostqueueOutput(bs) |
| 26 | if err != nil { |
| 27 | return nil, err |
| 28 | } |
| 29 | |
| 30 | mx := make(map[string]int64) |
| 31 | |
| 32 | mx["emails"] = stats.requests |
| 33 | mx["size"] = stats.sizeKbyte |
| 34 | |
| 35 | return mx, nil |
| 36 | } |
| 37 | |
| 38 | func parsePostqueueOutput(bs []byte) (*postqueueStats, error) { |
| 39 | if len(bs) == 0 { |
| 40 | return nil, errors.New("empty postqueue output") |
| 41 | } |
| 42 | |
| 43 | var lastLine string |
| 44 | sc := bufio.NewScanner(bytes.NewReader(bs)) |
| 45 | for sc.Scan() { |
| 46 | if line := strings.TrimSpace(sc.Text()); line != "" { |
| 47 | lastLine = strings.TrimSpace(sc.Text()) |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | if lastLine == "Mail queue is empty" { |
| 52 | return &postqueueStats{}, nil |
| 53 | } |
| 54 | |
| 55 | // -- 3 Kbytes in 3 Requests. |
| 56 | parts := strings.Fields(lastLine) |
| 57 | if len(parts) < 5 { |
| 58 | return nil, fmt.Errorf("unexpected postqueue output ('%s')", lastLine) |
| 59 | } |
| 60 | |
| 61 | size, err := strconv.ParseInt(parts[1], 10, 64) |
| 62 | if err != nil { |
| 63 | return nil, fmt.Errorf("unexpected postqueue output ('%s')", lastLine) |
| 64 | } |
| 65 | requests, err := strconv.ParseInt(parts[4], 10, 64) |
| 66 | if err != nil { |
| 67 | return nil, fmt.Errorf("unexpected postqueue output ('%s')", lastLine) |
| 68 | } |
| 69 | |
| 70 | return &postqueueStats{sizeKbyte: size, requests: requests}, nil |
| 71 | } |