| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | //go:build linux |
| 4 | |
| 5 | package systemdunits |
| 6 | |
| 7 | import ( |
| 8 | "fmt" |
| 9 | "regexp" |
| 10 | "strconv" |
| 11 | ) |
| 12 | |
| 13 | func (c *Collector) collect() (map[string]int64, error) { |
| 14 | conn, err := c.getConnection() |
| 15 | if err != nil { |
| 16 | return nil, err |
| 17 | } |
| 18 | |
| 19 | if c.systemdVersion == 0 { |
| 20 | ver, err := c.getSystemdVersion(conn) |
| 21 | if err != nil { |
| 22 | c.closeConnection() |
| 23 | return nil, err |
| 24 | } |
| 25 | c.systemdVersion = ver |
| 26 | } |
| 27 | |
| 28 | mx := make(map[string]int64) |
| 29 | |
| 30 | if err := c.collectUnits(mx, conn); err != nil { |
| 31 | c.closeConnection() |
| 32 | return nil, err |
| 33 | } |
| 34 | |
| 35 | if c.CollectUnitFiles && len(c.IncludeUnitFiles) > 0 { |
| 36 | if err := c.collectUnitFiles(mx, conn); err != nil { |
| 37 | c.closeConnection() |
| 38 | return mx, err |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | return mx, nil |
| 43 | } |
| 44 | |
| 45 | func (c *Collector) getConnection() (systemdConnection, error) { |
| 46 | if c.conn == nil { |
| 47 | conn, err := c.client.connect() |
| 48 | if err != nil { |
| 49 | return nil, fmt.Errorf("error on creating a connection: %v", err) |
| 50 | } |
| 51 | c.conn = conn |
| 52 | } |
| 53 | return c.conn, nil |
| 54 | } |
| 55 | |
| 56 | func (c *Collector) closeConnection() { |
| 57 | if c.conn != nil { |
| 58 | c.conn.Close() |
| 59 | c.conn = nil |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | var reVersion = regexp.MustCompile(`[0-9][0-9][0-9]`) |
| 64 | |
| 65 | const versionProperty = "Version" |
| 66 | |
| 67 | func (c *Collector) getSystemdVersion(conn systemdConnection) (int, error) { |
| 68 | c.Debugf("calling function 'GetManagerProperty'") |
| 69 | version, err := conn.GetManagerProperty(versionProperty) |
| 70 | if err != nil { |
| 71 | return 0, fmt.Errorf("error on getting '%s' manager property: %v", versionProperty, err) |
| 72 | } |
| 73 | |
| 74 | c.Debugf("systemd version: %s", version) |
| 75 | |
| 76 | major := reVersion.FindString(version) |
| 77 | if major == "" { |
| 78 | return 0, fmt.Errorf("couldn't parse systemd version string '%s'", version) |
| 79 | } |
| 80 | |
| 81 | ver, err := strconv.Atoi(major) |
| 82 | if err != nil { |
| 83 | return 0, fmt.Errorf("couldn't parse systemd version string '%s': %v", version, err) |
| 84 | } |
| 85 | |
| 86 | return ver, nil |
| 87 | } |