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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !nosystemd
package collector
import (
"flag"
"fmt"
"regexp"
"github.com/coreos/go-systemd/dbus"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
)
var (
unitWhitelist = flag.String("collector.systemd.unit-whitelist", ".+", "Regexp of systemd units to whitelist. Units must both match whitelist and not match blacklist to be included.")
unitBlacklist = flag.String("collector.systemd.unit-blacklist", "", "Regexp of systemd units to blacklist. Units must both match whitelist and not match blacklist to be included.")
)
type systemdCollector struct {
unitDesc *prometheus.Desc
systemRunningDesc *prometheus.Desc
unitWhitelistPattern *regexp.Regexp
unitBlacklistPattern *regexp.Regexp
}
var unitStatesName = []string{"active", "activating", "deactivating", "inactive", "failed"}
var (
systemdPrivate = flag.Bool(
"collector.systemd.private",
false,
"Establish a private, direct connection to systemd without dbus.",
)
)
func init() {
Factories["systemd"] = NewSystemdCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// systemd statistics.
func NewSystemdCollector() (Collector, error) {
const subsystem = "systemd"
unitDesc := prometheus.NewDesc(
prometheus.BuildFQName(Namespace, subsystem, "unit_state"),
"Systemd unit", []string{"name", "state"}, nil,
)
systemRunningDesc := prometheus.NewDesc(
prometheus.BuildFQName(Namespace, subsystem, "system_running"),
"Whether the system is operational (see 'systemctl is-system-running')",
nil, nil,
)
unitWhitelistPattern := regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *unitWhitelist))
unitBlacklistPattern := regexp.MustCompile(fmt.Sprintf("^(?:%s)$", *unitBlacklist))
return &systemdCollector{
unitDesc: unitDesc,
systemRunningDesc: systemRunningDesc,
unitWhitelistPattern: unitWhitelistPattern,
unitBlacklistPattern: unitBlacklistPattern,
}, nil
}
func (c *systemdCollector) Update(ch chan<- prometheus.Metric) (err error) {
units, err := c.listUnits()
if err != nil {
return fmt.Errorf("couldn't get units states: %s", err)
}
c.collectUnitStatusMetrics(ch, units)
systemState, err := c.getSystemState()
if err != nil {
return fmt.Errorf("couldn't get system state: %s", err)
}
c.collectSystemState(ch, systemState)
return nil
}
func (c *systemdCollector) collectUnitStatusMetrics(ch chan<- prometheus.Metric, units []dbus.UnitStatus) {
for _, unit := range units {
for _, stateName := range unitStatesName {
isActive := 0.0
if stateName == unit.ActiveState {
isActive = 1.0
}
ch <- prometheus.MustNewConstMetric(
c.unitDesc, prometheus.GaugeValue, isActive,
unit.Name, stateName)
}
}
}
func (c *systemdCollector) collectSystemState(ch chan<- prometheus.Metric, systemState string) {
isSystemRunning := 0.0
if systemState == `"running"` {
isSystemRunning = 1.0
}
ch <- prometheus.MustNewConstMetric(c.systemRunningDesc, prometheus.GaugeValue, isSystemRunning)
}
func (c *systemdCollector) newDbus() (*dbus.Conn, error) {
if *systemdPrivate {
return dbus.NewSystemdConnection()
}
return dbus.New()
}
func (c *systemdCollector) listUnits() ([]dbus.UnitStatus, error) {
conn, err := c.newDbus()
if err != nil {
return nil, fmt.Errorf("couldn't get dbus connection: %s", err)
}
allUnits, err := conn.ListUnits()
conn.Close()
if err != nil {
return []dbus.UnitStatus{}, err
}
units := filterUnits(allUnits, c.unitWhitelistPattern, c.unitBlacklistPattern)
return units, nil
}
func filterUnits(units []dbus.UnitStatus, whitelistPattern, blacklistPattern *regexp.Regexp) []dbus.UnitStatus {
filtered := make([]dbus.UnitStatus, 0, len(units))
for _, unit := range units {
if whitelistPattern.MatchString(unit.Name) && !blacklistPattern.MatchString(unit.Name) {
filtered = append(filtered, unit)
} else {
log.Debugf("Ignoring unit: %s", unit.Name)
}
}
return filtered
}
func (c *systemdCollector) getSystemState() (state string, err error) {
conn, err := c.newDbus()
if err != nil {
return "", fmt.Errorf("couldn't get dbus connection: %s", err)
}
state, err = conn.GetManagerProperty("SystemState")
conn.Close()
return state, err
}
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