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126 lines
3.0 KiB
126 lines
3.0 KiB
// +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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)
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var (
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netStatsMetrics = map[string]prometheus.Gauge{}
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)
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type netDevCollector struct {
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registry prometheus.Registry
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config Config
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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, registry prometheus.Registry) (Collector, error) {
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c := netDevCollector{
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config: config,
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registry: registry,
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}
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return &c, nil
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}
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func (c *netDevCollector) Update() (updates int, err error) {
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netStats, err := getNetStats()
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if err != nil {
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return updates, fmt.Errorf("Couldn't get netstats: %s", err)
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}
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for direction, devStats := range netStats {
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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 := netStatsMetrics[key]; !ok {
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netStatsMetrics[key] = prometheus.NewGauge()
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c.registry.Register(
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"node_network_"+key,
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t+" "+direction+" from /proc/net/dev",
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prometheus.NilLabels,
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netStatsMetrics[key],
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)
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}
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updates++
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v, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return updates, fmt.Errorf("Invalid value %s in netstats: %s", value, err)
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}
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netStatsMetrics[key].Set(map[string]string{"device": dev}, v)
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}
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}
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}
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return updates, err
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}
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func getNetStats() (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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return parseNetStats(file)
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}
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func parseNetStats(r io.ReadCloser) (map[string]map[string]map[string]string, error) {
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defer r.Close()
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netStats := map[string]map[string]map[string]string{}
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netStats["transmit"] = map[string]map[string]string{}
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netStats["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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netStats["transmit"][dev] = transmit
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netStats["receive"][dev] = receive
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}
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return netStats, 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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