343 lines
11 KiB
Go
343 lines
11 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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"fmt"
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"regexp"
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"strings"
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"github.com/coreos/go-systemd/dbus"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/log"
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"gopkg.in/alecthomas/kingpin.v2"
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)
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var (
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unitWhitelist = kingpin.Flag("collector.systemd.unit-whitelist", "Regexp of systemd units to whitelist. Units must both match whitelist and not match blacklist to be included.").Default(".+").String()
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unitBlacklist = kingpin.Flag("collector.systemd.unit-blacklist", "Regexp of systemd units to blacklist. Units must both match whitelist and not match blacklist to be included.").Default(".+\\.scope").String()
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systemdPrivate = kingpin.Flag("collector.systemd.private", "Establish a private, direct connection to systemd without dbus.").Bool()
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)
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type systemdCollector struct {
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unitDesc *prometheus.Desc
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unitStartTimeDesc *prometheus.Desc
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systemRunningDesc *prometheus.Desc
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summaryDesc *prometheus.Desc
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nRestartsDesc *prometheus.Desc
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timerLastTriggerDesc *prometheus.Desc
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socketAcceptedConnectionsDesc *prometheus.Desc
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socketCurrentConnectionsDesc *prometheus.Desc
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socketRefusedConnectionsDesc *prometheus.Desc
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unitWhitelistPattern *regexp.Regexp
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unitBlacklistPattern *regexp.Regexp
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}
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var unitStatesName = []string{"active", "activating", "deactivating", "inactive", "failed"}
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func init() {
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registerCollector("systemd", defaultDisabled, NewSystemdCollector)
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}
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// NewSystemdCollector returns a new Collector exposing 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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unitStartTimeDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "unit_start_time_seconds"),
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"Start time of the unit since unix epoch in seconds.", []string{"name"}, 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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summaryDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "units"),
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"Summary of systemd unit states", []string{"state"}, nil)
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nRestartsDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "service_restart_total"),
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"Service unit count of Restart triggers", []string{"state"}, nil)
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timerLastTriggerDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "timer_last_trigger_seconds"),
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"Seconds since epoch of last trigger.", []string{"name"}, nil)
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socketAcceptedConnectionsDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "socket_accepted_connections_total"),
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"Total number of accepted socket connections", []string{"name"}, nil)
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socketCurrentConnectionsDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "socket_current_connections"),
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"Current number of socket connections", []string{"name"}, nil)
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socketRefusedConnectionsDesc := prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "socket_refused_connections_total"),
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"Total number of refused socket connections", []string{"name"}, nil)
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unitWhitelistPattern := regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *unitWhitelist))
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unitBlacklistPattern := regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *unitBlacklist))
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return &systemdCollector{
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unitDesc: unitDesc,
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unitStartTimeDesc: unitStartTimeDesc,
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systemRunningDesc: systemRunningDesc,
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summaryDesc: summaryDesc,
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nRestartsDesc: nRestartsDesc,
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timerLastTriggerDesc: timerLastTriggerDesc,
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socketAcceptedConnectionsDesc: socketAcceptedConnectionsDesc,
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socketCurrentConnectionsDesc: socketCurrentConnectionsDesc,
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socketRefusedConnectionsDesc: socketRefusedConnectionsDesc,
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unitWhitelistPattern: unitWhitelistPattern,
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unitBlacklistPattern: unitBlacklistPattern,
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}, nil
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}
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func (c *systemdCollector) Update(ch chan<- prometheus.Metric) error {
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allUnits, err := c.getAllUnits()
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if err != nil {
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return fmt.Errorf("couldn't get units: %s", err)
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}
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summary := summarizeUnits(allUnits)
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c.collectSummaryMetrics(ch, summary)
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units := filterUnits(allUnits, c.unitWhitelistPattern, c.unitBlacklistPattern)
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c.collectUnitStatusMetrics(ch, units)
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c.collectUnitStartTimeMetrics(ch, units)
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c.collectTimers(ch, units)
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c.collectSockets(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 []unit) {
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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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if strings.HasSuffix(unit.Name, ".service") && unit.nRestarts != nil {
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ch <- prometheus.MustNewConstMetric(
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c.nRestartsDesc, prometheus.CounterValue,
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float64(*unit.nRestarts), unit.Name)
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}
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}
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}
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func (c *systemdCollector) collectSockets(ch chan<- prometheus.Metric, units []unit) {
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for _, unit := range units {
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if !strings.HasSuffix(unit.Name, ".socket") {
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continue
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}
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ch <- prometheus.MustNewConstMetric(
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c.socketAcceptedConnectionsDesc, prometheus.CounterValue,
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float64(unit.acceptedConnections), unit.Name)
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ch <- prometheus.MustNewConstMetric(
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c.socketCurrentConnectionsDesc, prometheus.GaugeValue,
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float64(unit.currentConnections), unit.Name)
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if unit.refusedConnections != nil {
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ch <- prometheus.MustNewConstMetric(
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c.socketRefusedConnectionsDesc, prometheus.GaugeValue,
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float64(*unit.refusedConnections), unit.Name)
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}
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}
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}
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func (c *systemdCollector) collectUnitStartTimeMetrics(ch chan<- prometheus.Metric, units []unit) {
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for _, unit := range units {
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ch <- prometheus.MustNewConstMetric(
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c.unitStartTimeDesc, prometheus.GaugeValue,
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float64(unit.startTimeUsec)/1e6, unit.Name)
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}
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}
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func (c *systemdCollector) collectTimers(ch chan<- prometheus.Metric, units []unit) {
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for _, unit := range units {
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if !strings.HasSuffix(unit.Name, ".timer") {
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continue
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}
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ch <- prometheus.MustNewConstMetric(
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c.timerLastTriggerDesc, prometheus.GaugeValue,
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float64(unit.lastTriggerUsec)/1e6, unit.Name)
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}
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}
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func (c *systemdCollector) collectSummaryMetrics(ch chan<- prometheus.Metric, summary map[string]float64) {
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for stateName, count := range summary {
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ch <- prometheus.MustNewConstMetric(
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c.summaryDesc, prometheus.GaugeValue, count, stateName)
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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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type unit struct {
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dbus.UnitStatus
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lastTriggerUsec uint64
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startTimeUsec uint64
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nRestarts *uint32
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acceptedConnections uint32
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currentConnections uint32
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refusedConnections *uint32
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}
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func (c *systemdCollector) getAllUnits() ([]unit, 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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defer conn.Close()
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// Filter out any units that are not installed and are pulled in only as dependencies.
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allUnits, err := conn.ListUnitsFiltered([]string{"loaded"})
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if err != nil {
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return nil, err
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}
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result := make([]unit, 0, len(allUnits))
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for _, status := range allUnits {
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unit := unit{
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UnitStatus: status,
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}
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if strings.HasSuffix(unit.Name, ".timer") {
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lastTriggerValue, err := conn.GetUnitTypeProperty(unit.Name, "Timer", "LastTriggerUSec")
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if err != nil {
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log.Debugf("couldn't get unit '%s' LastTriggerUSec: %s\n", unit.Name, err)
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continue
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}
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unit.lastTriggerUsec = lastTriggerValue.Value.Value().(uint64)
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}
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if strings.HasSuffix(unit.Name, ".service") {
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// NRestarts wasn't added until systemd 235.
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restartsCount, err := conn.GetUnitTypeProperty(unit.Name, "Service", "NRestarts")
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if err != nil {
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log.Debugf("couldn't get unit '%s' NRestarts: %s\n", unit.Name, err)
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} else {
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nRestarts := restartsCount.Value.Value().(uint32)
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unit.nRestarts = &nRestarts
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}
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}
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if strings.HasSuffix(unit.Name, ".socket") {
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acceptedConnectionCount, err := conn.GetUnitTypeProperty(unit.Name, "Socket", "NAccepted")
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if err != nil {
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log.Debugf("couldn't get unit '%s' NAccepted: %s\n", unit.Name, err)
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continue
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}
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unit.acceptedConnections = acceptedConnectionCount.Value.Value().(uint32)
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currentConnectionCount, err := conn.GetUnitTypeProperty(unit.Name, "Socket", "NConnections")
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if err != nil {
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log.Debugf("couldn't get unit '%s' NConnections: %s\n", unit.Name, err)
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continue
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}
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unit.currentConnections = currentConnectionCount.Value.Value().(uint32)
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// NRefused wasn't added until systemd 239.
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refusedConnectionCount, err := conn.GetUnitTypeProperty(unit.Name, "Socket", "NRefused")
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if err != nil {
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log.Debugf("couldn't get unit '%s' NRefused: %s\n", unit.Name, err)
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} else {
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nRefused := refusedConnectionCount.Value.Value().(uint32)
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unit.refusedConnections = &nRefused
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}
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}
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if unit.ActiveState != "active" {
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unit.startTimeUsec = 0
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} else {
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timestampValue, err := conn.GetUnitProperty(unit.Name, "ActiveEnterTimestamp")
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if err != nil {
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log.Debugf("couldn't get unit '%s' StartTimeUsec: %s\n", unit.Name, err)
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continue
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}
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unit.startTimeUsec = timestampValue.Value.Value().(uint64)
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}
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result = append(result, unit)
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}
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return result, nil
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}
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func summarizeUnits(units []unit) map[string]float64 {
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summarized := make(map[string]float64)
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for _, unitStateName := range unitStatesName {
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summarized[unitStateName] = 0.0
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}
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for _, unit := range units {
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summarized[unit.ActiveState] += 1.0
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}
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return summarized
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}
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func filterUnits(units []unit, whitelistPattern, blacklistPattern *regexp.Regexp) []unit {
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filtered := make([]unit, 0, len(units))
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for _, unit := range units {
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if whitelistPattern.MatchString(unit.Name) && !blacklistPattern.MatchString(unit.Name) {
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filtered = append(filtered, unit)
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} else {
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log.Debugf("Ignoring unit: %s", unit.Name)
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}
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}
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return filtered
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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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