mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-25 06:16:26 +01:00
82 lines
2.1 KiB
Go
82 lines
2.1 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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"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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}
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var unitStatesName = []string{"active", "activating", "deactivating", "inactive", "failed"}
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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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unitDesc := prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, "systemd", "unit_state"),
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"Systemd unit", []string{"name", "state"}, nil,
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)
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return &systemdCollector{
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unitDesc: unitDesc,
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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.collectMetrics(ch, units)
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return nil
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}
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func (c *systemdCollector) collectMetrics(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) listUnits() ([]dbus.UnitStatus, error) {
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conn, err := dbus.New()
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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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