mirror of
https://github.com/prometheus/node_exporter.git
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127 lines
3 KiB
Go
127 lines
3 KiB
Go
// +build !nonetdev
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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procNetDev = "/proc/net/dev"
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netDevSubsystem = "network"
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)
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type netDevCollector struct {
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config Config
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metrics map[string]*prometheus.GaugeVec
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}
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func init() {
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Factories["netdev"] = NewNetDevCollector
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}
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// Takes a config struct and prometheus registry and returns a new Collector exposing
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// network device stats.
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func NewNetDevCollector(config Config) (Collector, error) {
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return &netDevCollector{
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config: config,
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metrics: map[string]*prometheus.GaugeVec{},
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}, nil
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}
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func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
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netDev, err := getNetDevStats()
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if err != nil {
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return fmt.Errorf("Couldn't get netstats: %s", err)
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}
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for direction, devStats := range netDev {
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for dev, stats := range devStats {
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for t, value := range stats {
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key := direction + "_" + t
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if _, ok := c.metrics[key]; !ok {
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c.metrics[key] = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: netDevSubsystem,
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Name: key,
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Help: fmt.Sprintf("%s %s from /proc/net/dev.", t, direction),
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},
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[]string{"device"},
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)
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}
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return fmt.Errorf("Invalid value %s in netstats: %s", value, err)
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}
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c.metrics[key].WithLabelValues(dev).Set(v)
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}
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}
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}
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for _, m := range c.metrics {
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m.Collect(ch)
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}
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return err
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}
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func getNetDevStats() (map[string]map[string]map[string]string, error) {
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file, err := os.Open(procNetDev)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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return parseNetDevStats(file)
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}
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func parseNetDevStats(r io.Reader) (map[string]map[string]map[string]string, error) {
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netDev := map[string]map[string]map[string]string{}
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netDev["transmit"] = map[string]map[string]string{}
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netDev["receive"] = map[string]map[string]string{}
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scanner := bufio.NewScanner(r)
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scanner.Scan() // skip first header
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scanner.Scan()
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parts := strings.Split(string(scanner.Text()), "|")
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if len(parts) != 3 { // interface + receive + transmit
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return nil, fmt.Errorf("Invalid header line in %s: %s",
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procNetDev, scanner.Text())
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}
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header := strings.Fields(parts[1])
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for scanner.Scan() {
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parts := strings.Fields(string(scanner.Text()))
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if len(parts) != 2*len(header)+1 {
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return nil, fmt.Errorf("Invalid line in %s: %s",
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procNetDev, scanner.Text())
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}
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dev := parts[0][:len(parts[0])-1]
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receive, err := parseNetDevLine(parts[1:len(header)+1], header)
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if err != nil {
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return nil, err
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}
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transmit, err := parseNetDevLine(parts[len(header)+1:], header)
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if err != nil {
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return nil, err
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}
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netDev["transmit"][dev] = transmit
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netDev["receive"][dev] = receive
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}
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return netDev, nil
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}
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func parseNetDevLine(parts []string, header []string) (map[string]string, error) {
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devStats := map[string]string{}
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for i, v := range parts {
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devStats[header[i]] = v
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}
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return devStats, nil
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}
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