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Refactor systemd version

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Move the systemd version function to an exporter method. This way we can
update the Verison information at every scrape, in case the underlying
version changes.

Signed-off-by: Ben Kochie <superq@gmail.com>
This commit is contained in:
Ben Kochie 2022-02-06 15:33:30 +01:00
parent f7086d437b
commit 5981bbe638
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GPG key ID: C646B23C9E3245F1
1 changed files with 16 additions and 23 deletions
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39
collector/systemd_linux.go
View file

@ -57,6 +57,8 @@ var (
enableTaskMetrics = kingpin.Flag("collector.systemd.enable-task-metrics", "Enables service unit tasks metrics unit_tasks_current and unit_tasks_max").Bool()
enableRestartsMetrics = kingpin.Flag("collector.systemd.enable-restarts-metrics", "Enables service unit metric service_restart_total").Bool()
enableStartTimeMetrics = kingpin.Flag("collector.systemd.enable-start-time-metrics", "Enables service unit metric unit_start_time_seconds").Bool()
systemdVersionRE = regexp.MustCompile(`[0-9]{3,}(\.[0-9]+)?`)
)
type systemdCollector struct {
@ -152,12 +154,6 @@ func NewSystemdCollector(logger log.Logger) (Collector, error) {
level.Info(logger).Log("msg", "Parsed flag --collector.systemd.unit-exclude", "flag", *unitExclude)
unitExcludePattern := regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *unitExclude))
systemdVersion := getSystemdVersion(logger)
if systemdVersion < minSystemdVersionSystemState {
level.Warn(logger).Log("msg", "Detected systemd version is lower than minimum", "current", systemdVersion, "minimum", minSystemdVersionSystemState)
level.Warn(logger).Log("msg", "Some systemd state and timer metrics will not be available")
}
return &systemdCollector{
unitDesc: unitDesc,
unitStartTimeDesc: unitStartTimeDesc,
@ -171,7 +167,6 @@ func NewSystemdCollector(logger log.Logger) (Collector, error) {
socketCurrentConnectionsDesc: socketCurrentConnectionsDesc,
socketRefusedConnectionsDesc: socketRefusedConnectionsDesc,
systemdVersionDesc: systemdVersionDesc,
systemdVersion: systemdVersion,
unitIncludePattern: unitIncludePattern,
unitExcludePattern: unitExcludePattern,
logger: logger,
@ -188,6 +183,13 @@ func (c *systemdCollector) Update(ch chan<- prometheus.Metric) error {
}
defer conn.Close()
systemdVersion := c.getSystemdVersion(conn)
if systemdVersion < minSystemdVersionSystemState {
level.Debug(c.logger).Log("msg", "Detected systemd version is lower than minimum, some systemd state and timer metrics will not be available", "current", systemdVersion, "minimum", minSystemdVersionSystemState)
}
ch <- prometheus.MustNewConstMetric(
c.systemdVersionDesc, prometheus.GaugeValue, systemdVersion)
allUnits, err := c.getAllUnits(conn)
if err != nil {
return fmt.Errorf("couldn't get units: %w", err)
@ -234,7 +236,7 @@ func (c *systemdCollector) Update(ch chan<- prometheus.Metric) error {
}()
}
if c.systemdVersion >= minSystemdVersionSystemState {
if systemdVersion >= minSystemdVersionSystemState {
wg.Add(1)
go func() {
defer wg.Done()
@ -252,15 +254,12 @@ func (c *systemdCollector) Update(ch chan<- prometheus.Metric) error {
level.Debug(c.logger).Log("msg", "collectSockets took", "duration_seconds", time.Since(begin).Seconds())
}()
if c.systemdVersion >= minSystemdVersionSystemState {
if systemdVersion >= minSystemdVersionSystemState {
begin = time.Now()
err = c.collectSystemState(conn, ch)
level.Debug(c.logger).Log("msg", "collectSystemState took", "duration_seconds", time.Since(begin).Seconds())
}
ch <- prometheus.MustNewConstMetric(
c.systemdVersionDesc, prometheus.GaugeValue, float64(c.systemdVersion))
return err
}
@ -488,23 +487,17 @@ func filterUnits(units []unit, includePattern, excludePattern *regexp.Regexp, lo
return filtered
}
func getSystemdVersion(logger log.Logger) float64 {
conn, err := newSystemdDbusConn()
if err != nil {
level.Warn(logger).Log("msg", "Unable to get systemd dbus connection, defaulting systemd version to 0", "err", err)
return 0
}
defer conn.Close()
func (c *systemdCollector) getSystemdVersion(conn *dbus.Conn) float64 {
version, err := conn.GetManagerProperty("Version")
if err != nil {
level.Warn(logger).Log("msg", "Unable to get systemd version property, defaulting to 0")
level.Debug(c.logger).Log("msg", "Unable to get systemd version property, defaulting to 0")
return 0
}
re := regexp.MustCompile(`[0-9][0-9][0-9](\.[0-9]+)?`)
version = re.FindString(version)
level.Debug(c.logger).Log("msg", "Got systemd version", "version", version)
version = systemdVersionRE.FindString(version)
v, err := strconv.ParseFloat(version, 64)
if err != nil {
level.Warn(logger).Log("msg", "Got invalid systemd version", "version", version)
level.Debug(c.logger).Log("msg", "Got invalid systemd version", "version", version)
return 0
}
return v