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// SPDX-License-Identifier: GPL-3.0-or-later
//go:build linux
// +build linux
package systemdunits
import (
"context"
"fmt"
"regexp"
"strconv"
"strings"
"github.com/coreos/go-systemd/v22/dbus"
)
const (
// https://www.freedesktop.org/software/systemd/man/systemd.html
unitStateActive = "active"
unitStateInactive = "inactive"
unitStateActivating = "activating"
unitStateDeactivating = "deactivating"
unitStateFailed = "failed"
// https://www.freedesktop.org/software/systemd/man/systemd.html
unitTypeService = "service"
unitTypeSocket = "socket"
unitTypeTarget = "target"
unitTypePath = "path"
unitTypeDevice = "device"
unitTypeMount = "mount"
unitTypeAutomount = "automount"
unitTypeSwap = "swap"
unitTypeTimer = "timer"
unitTypeScope = "scope"
unitTypeSlice = "slice"
)
var (
unitStates = []string{
unitStateActive,
unitStateActivating,
unitStateFailed,
unitStateInactive,
unitStateDeactivating,
}
)
func (s *SystemdUnits) collect() (map[string]int64, error) {
conn, err := s.getConnection()
if err != nil {
return nil, err
}
if s.systemdVersion == 0 {
ver, err := s.getSystemdVersion(conn)
if err != nil {
s.closeConnection()
return nil, err
}
s.systemdVersion = ver
}
var units []dbus.UnitStatus
if s.systemdVersion >= 230 {
// https://github.com/systemd/systemd/pull/3142
units, err = s.getLoadedUnitsByPatterns(conn)
} else {
units, err = s.getLoadedUnits(conn)
}
if err != nil {
s.closeConnection()
return nil, err
}
if len(units) == 0 {
return nil, nil
}
mx := make(map[string]int64)
s.collectUnitsStates(mx, units)
return mx, nil
}
func (s *SystemdUnits) collectUnitsStates(mx map[string]int64, units []dbus.UnitStatus) {
for _, unit := range units {
name, typ := extractUnitNameType(cleanUnitName(unit.Name))
if name == "" || typ == "" {
continue
}
if !s.units[unit.Name] {
s.units[unit.Name] = true
s.addUnitToCharts(name, typ)
}
for _, s := range unitStates {
mx[fmt.Sprintf("unit_%s_%s_state_%s", name, typ, s)] = 0
}
mx[fmt.Sprintf("unit_%s_%s_state_%s", name, typ, unit.ActiveState)] = 1
}
}
func (s *SystemdUnits) getConnection() (systemdConnection, error) {
if s.conn == nil {
conn, err := s.client.connect()
if err != nil {
return nil, fmt.Errorf("error on creating a connection: %v", err)
}
s.conn = conn
}
return s.conn, nil
}
func (s *SystemdUnits) closeConnection() {
if s.conn != nil {
s.conn.Close()
s.conn = nil
}
}
var reVersion = regexp.MustCompile(`[0-9][0-9][0-9]`)
const versionProperty = "Version"
func (s *SystemdUnits) getSystemdVersion(conn systemdConnection) (int, error) {
s.Debugf("calling function 'GetManagerProperty'")
version, err := conn.GetManagerProperty(versionProperty)
if err != nil {
return 0, fmt.Errorf("error on getting '%s' manager property: %v", versionProperty, err)
}
s.Debugf("systemd version: %s", version)
major := reVersion.FindString(version)
if major == "" {
return 0, fmt.Errorf("couldn't parse systemd version string '%s'", version)
}
ver, err := strconv.Atoi(major)
if err != nil {
return 0, fmt.Errorf("couldn't parse systemd version string '%s': %v", version, err)
}
return ver, nil
}
func (s *SystemdUnits) getLoadedUnits(conn systemdConnection) ([]dbus.UnitStatus, error) {
ctx, cancel := context.WithTimeout(context.Background(), s.Timeout.Duration())
defer cancel()
s.Debugf("calling function 'ListUnits'")
units, err := conn.ListUnitsContext(ctx)
if err != nil {
return nil, fmt.Errorf("error on ListUnits: %v", err)
}
loaded := units[:0]
for _, unit := range units {
if unit.LoadState == "loaded" && s.sr.MatchString(unit.Name) {
loaded = append(loaded, unit)
}
}
s.Debugf("got total/loaded %d/%d units", len(units), len(loaded))
return loaded, nil
}
func (s *SystemdUnits) getLoadedUnitsByPatterns(conn systemdConnection) ([]dbus.UnitStatus, error) {
ctx, cancel := context.WithTimeout(context.Background(), s.Timeout.Duration())
defer cancel()
s.Debugf("calling function 'ListUnitsByPatterns'")
units, err := conn.ListUnitsByPatternsContext(ctx, unitStates, s.Include)
if err != nil {
return nil, fmt.Errorf("error on ListUnitsByPatterns: %v", err)
}
loaded := units[:0]
for _, unit := range units {
if unit.LoadState == "loaded" {
loaded = append(loaded, unit)
}
}
s.Debugf("got total/loaded %d/%d units", len(units), len(loaded))
return loaded, nil
}
func extractUnitNameType(name string) (string, string) {
idx := strings.LastIndexByte(name, '.')
if idx <= 0 {
return "", ""
}
return name[:idx], name[idx+1:]
}
func cleanUnitName(name string) string {
// dev-disk-by\x2duuid-DE44\x2dCEE0.device => dev-disk-by-uuid-DE44-CEE0.device
if strings.IndexByte(name, '\\') == -1 {
return name
}
v, err := strconv.Unquote("\"" + name + "\"")
if err != nil {
return name
}
return v
}
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