mirror of
https://github.com/prometheus/node_exporter
synced 2024-12-14 02:15:18 +00:00
369 lines
9.7 KiB
Go
369 lines
9.7 KiB
Go
// Copyright 2017 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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package collector
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/mdlayher/wifi"
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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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type wifiCollector struct {
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interfaceFrequencyHertz *prometheus.Desc
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stationInfo *prometheus.Desc
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stationConnectedSecondsTotal *prometheus.Desc
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stationInactiveSeconds *prometheus.Desc
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stationReceiveBitsPerSecond *prometheus.Desc
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stationTransmitBitsPerSecond *prometheus.Desc
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stationSignalDBM *prometheus.Desc
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stationTransmitRetriesTotal *prometheus.Desc
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stationTransmitFailedTotal *prometheus.Desc
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stationBeaconLossTotal *prometheus.Desc
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}
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var (
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collectorWifi = kingpin.Flag("collector.wifi.fixtures", "test fixtures to use for wifi collector metrics").Default("").String()
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)
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func init() {
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registerCollector("wifi", defaultEnabled, NewWifiCollector)
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}
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var _ wifiStater = &wifi.Client{}
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// wifiStater is an interface used to swap out a *wifi.Client for end to end tests.
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type wifiStater interface {
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BSS(ifi *wifi.Interface) (*wifi.BSS, error)
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Close() error
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Interfaces() ([]*wifi.Interface, error)
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StationInfo(ifi *wifi.Interface) ([]*wifi.StationInfo, error)
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}
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// NewWifiCollector returns a new Collector exposing Wifi statistics.
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func NewWifiCollector() (Collector, error) {
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const (
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subsystem = "wifi"
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)
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var (
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labels = []string{"device", "mac_address"}
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)
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return &wifiCollector{
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interfaceFrequencyHertz: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "interface_frequency_hertz"),
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"The current frequency a WiFi interface is operating at, in hertz.",
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[]string{"device"},
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nil,
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),
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stationInfo: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_info"),
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"Labeled WiFi interface station information as provided by the operating system.",
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[]string{"device", "bssid", "ssid", "mode"},
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nil,
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),
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stationConnectedSecondsTotal: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_connected_seconds_total"),
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"The total number of seconds a station has been connected to an access point.",
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labels,
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nil,
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),
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stationInactiveSeconds: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_inactive_seconds"),
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"The number of seconds since any wireless activity has occurred on a station.",
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labels,
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nil,
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),
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stationReceiveBitsPerSecond: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_receive_bits_per_second"),
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"The current WiFi receive bitrate of a station, in bits per second.",
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labels,
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nil,
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),
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stationTransmitBitsPerSecond: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_transmit_bits_per_second"),
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"The current WiFi transmit bitrate of a station, in bits per second.",
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labels,
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nil,
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),
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stationSignalDBM: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_signal_dbm"),
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"The current WiFi signal strength, in decibel-milliwatts (dBm).",
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labels,
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nil,
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),
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stationTransmitRetriesTotal: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_transmit_retries_total"),
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"The total number of times a station has had to retry while sending a packet.",
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labels,
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nil,
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),
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stationTransmitFailedTotal: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_transmit_failed_total"),
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"The total number of times a station has failed to send a packet.",
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labels,
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nil,
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),
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stationBeaconLossTotal: prometheus.NewDesc(
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prometheus.BuildFQName(namespace, subsystem, "station_beacon_loss_total"),
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"The total number of times a station has detected a beacon loss.",
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labels,
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nil,
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),
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}, nil
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}
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func (c *wifiCollector) Update(ch chan<- prometheus.Metric) error {
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stat, err := newWifiStater(*collectorWifi)
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if err != nil {
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// Cannot access wifi metrics, report no error.
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if os.IsNotExist(err) {
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log.Debug("wifi collector metrics are not available for this system")
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return nil
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}
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if os.IsPermission(err) {
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log.Debug("wifi collector got permission denied when accessing metrics")
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return nil
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}
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return fmt.Errorf("failed to access wifi data: %v", err)
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}
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defer stat.Close()
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ifis, err := stat.Interfaces()
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if err != nil {
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return fmt.Errorf("failed to retrieve wifi interfaces: %v", err)
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}
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for _, ifi := range ifis {
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// Some virtual devices have no "name" and should be skipped.
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if ifi.Name == "" {
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continue
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}
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log.Debugf("probing wifi device %q with type %q", ifi.Name, ifi.Type)
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ch <- prometheus.MustNewConstMetric(
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c.interfaceFrequencyHertz,
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prometheus.GaugeValue,
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mHzToHz(ifi.Frequency),
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ifi.Name,
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)
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// When a statistic is not available for a given interface, package wifi
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// returns an error compatible with os.IsNotExist. We leverage this to
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// only export metrics which are actually valid for given interface types.
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bss, err := stat.BSS(ifi)
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switch {
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case err == nil:
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c.updateBSSStats(ch, ifi.Name, bss)
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case os.IsNotExist(err):
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log.Debugf("BSS information not found for wifi device %q", ifi.Name)
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default:
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return fmt.Errorf("failed to retrieve BSS for device %s: %v",
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ifi.Name, err)
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}
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stations, err := stat.StationInfo(ifi)
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switch {
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case err == nil:
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for _, station := range stations {
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c.updateStationStats(ch, ifi.Name, station)
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}
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case os.IsNotExist(err):
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log.Debugf("station information not found for wifi device %q", ifi.Name)
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default:
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return fmt.Errorf("failed to retrieve station info for device %q: %v",
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ifi.Name, err)
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}
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}
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return nil
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}
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func (c *wifiCollector) updateBSSStats(ch chan<- prometheus.Metric, device string, bss *wifi.BSS) {
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// Synthetic metric which provides wifi station info, such as SSID, BSSID, etc.
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ch <- prometheus.MustNewConstMetric(
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c.stationInfo,
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prometheus.GaugeValue,
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1,
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device,
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bss.BSSID.String(),
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bss.SSID,
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bssStatusMode(bss.Status),
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)
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}
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func (c *wifiCollector) updateStationStats(ch chan<- prometheus.Metric, device string, info *wifi.StationInfo) {
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ch <- prometheus.MustNewConstMetric(
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c.stationConnectedSecondsTotal,
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prometheus.CounterValue,
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info.Connected.Seconds(),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationInactiveSeconds,
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prometheus.GaugeValue,
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info.Inactive.Seconds(),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationReceiveBitsPerSecond,
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prometheus.GaugeValue,
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float64(info.ReceiveBitrate),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationTransmitBitsPerSecond,
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prometheus.GaugeValue,
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float64(info.TransmitBitrate),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationSignalDBM,
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prometheus.GaugeValue,
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float64(info.Signal),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationTransmitRetriesTotal,
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prometheus.CounterValue,
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float64(info.TransmitRetries),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationTransmitFailedTotal,
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prometheus.CounterValue,
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float64(info.TransmitFailed),
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device,
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info.HardwareAddr.String(),
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)
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ch <- prometheus.MustNewConstMetric(
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c.stationBeaconLossTotal,
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prometheus.CounterValue,
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float64(info.BeaconLoss),
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device,
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info.HardwareAddr.String(),
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)
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}
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func mHzToHz(mHz int) float64 {
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return float64(mHz) * 1000 * 1000
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}
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func bssStatusMode(status wifi.BSSStatus) string {
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switch status {
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case wifi.BSSStatusAuthenticated, wifi.BSSStatusAssociated:
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return "client"
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case wifi.BSSStatusIBSSJoined:
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return "ad-hoc"
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default:
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return "unknown"
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}
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}
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// All code below this point is used to assist with end-to-end tests for
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// the wifi collector, since wifi devices are not available in CI.
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// newWifiStater determines if mocked test fixtures from files should be used for
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// collecting wifi metrics, or if package wifi should be used.
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func newWifiStater(fixtures string) (wifiStater, error) {
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if fixtures != "" {
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return &mockWifiStater{
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fixtures: fixtures,
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}, nil
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}
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return wifi.New()
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}
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var _ wifiStater = &mockWifiStater{}
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type mockWifiStater struct {
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fixtures string
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}
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func (s *mockWifiStater) unmarshalJSONFile(filename string, v interface{}) error {
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b, err := ioutil.ReadFile(filepath.Join(s.fixtures, filename))
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if err != nil {
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return err
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}
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return json.Unmarshal(b, v)
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}
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func (s *mockWifiStater) Close() error { return nil }
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func (s *mockWifiStater) BSS(ifi *wifi.Interface) (*wifi.BSS, error) {
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p := filepath.Join(ifi.Name, "bss.json")
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var bss wifi.BSS
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if err := s.unmarshalJSONFile(p, &bss); err != nil {
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return nil, err
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}
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return &bss, nil
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}
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func (s *mockWifiStater) Interfaces() ([]*wifi.Interface, error) {
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var ifis []*wifi.Interface
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if err := s.unmarshalJSONFile("interfaces.json", &ifis); err != nil {
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return nil, err
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}
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return ifis, nil
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}
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func (s *mockWifiStater) StationInfo(ifi *wifi.Interface) ([]*wifi.StationInfo, error) {
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p := filepath.Join(ifi.Name, "stationinfo.json")
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var stations []*wifi.StationInfo
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if err := s.unmarshalJSONFile(p, &stations); err != nil {
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return nil, err
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}
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return stations, nil
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}
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