mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-20 07:26:08 +01:00
130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
// Copyright 2015 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nosystemd
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package collector
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import (
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"flag"
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"fmt"
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"github.com/coreos/go-systemd/dbus"
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"github.com/prometheus/client_golang/prometheus"
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)
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type systemdCollector struct {
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unitDesc *prometheus.Desc
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systemRunningDesc *prometheus.Desc
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}
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var unitStatesName = []string{"active", "activating", "deactivating", "inactive", "failed"}
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var (
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systemdPrivate = flag.Bool(
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"collector.systemd.private",
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false,
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"Establish a private, direct connection to systemd without dbus.",
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)
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)
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func init() {
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Factories["systemd"] = NewSystemdCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// systemd statistics.
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func NewSystemdCollector() (Collector, error) {
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const subsystem = "systemd"
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unitDesc := prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, subsystem, "unit_state"),
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"Systemd unit", []string{"name", "state"}, nil,
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)
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systemRunningDesc := prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, subsystem, "system_running"),
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"Whether the system is operational (see 'systemctl is-system-running')",
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nil, nil,
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)
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return &systemdCollector{
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unitDesc: unitDesc,
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systemRunningDesc: systemRunningDesc,
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}, nil
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}
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func (c *systemdCollector) Update(ch chan<- prometheus.Metric) (err error) {
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units, err := c.listUnits()
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if err != nil {
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return fmt.Errorf("couldn't get units states: %s", err)
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}
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c.collectUnitStatusMetrics(ch, units)
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systemState, err := c.getSystemState()
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if err != nil {
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return fmt.Errorf("couldn't get system state: %s", err)
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}
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c.collectSystemState(ch, systemState)
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return nil
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}
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func (c *systemdCollector) collectUnitStatusMetrics(ch chan<- prometheus.Metric, units []dbus.UnitStatus) {
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for _, unit := range units {
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for _, stateName := range unitStatesName {
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isActive := 0.0
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if stateName == unit.ActiveState {
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isActive = 1.0
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}
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ch <- prometheus.MustNewConstMetric(
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c.unitDesc, prometheus.GaugeValue, isActive,
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unit.Name, stateName)
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}
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}
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}
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func (c *systemdCollector) collectSystemState(ch chan<- prometheus.Metric, systemState string) {
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isSystemRunning := 0.0
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if systemState == `"running"` {
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isSystemRunning = 1.0
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}
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ch <- prometheus.MustNewConstMetric(c.systemRunningDesc, prometheus.GaugeValue, isSystemRunning)
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}
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func (c *systemdCollector) newDbus() (*dbus.Conn, error) {
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if *systemdPrivate {
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return dbus.NewSystemdConnection()
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}
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return dbus.New()
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}
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func (c *systemdCollector) listUnits() ([]dbus.UnitStatus, error) {
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conn, err := c.newDbus()
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if err != nil {
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return nil, fmt.Errorf("couldn't get dbus connection: %s", err)
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}
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units, err := conn.ListUnits()
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conn.Close()
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return units, err
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}
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func (c *systemdCollector) getSystemState() (state string, err error) {
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conn, err := c.newDbus()
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if err != nil {
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return "", fmt.Errorf("couldn't get dbus connection: %s", err)
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}
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state, err = conn.GetManagerProperty("SystemState")
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conn.Close()
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return state, err
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}
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