mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-11-10 07:34:09 -08:00
102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
// +build linux,!nonetstat
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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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procNetStat = "/proc/net/netstat"
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netStatsSubsystem = "netstat"
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)
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type netStatCollector struct {
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metrics map[string]prometheus.Gauge
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}
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func init() {
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Factories["netstat"] = NewNetStatCollector
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}
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// NewNetStatCollector takes a returns
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// a new Collector exposing network stats.
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func NewNetStatCollector() (Collector, error) {
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return &netStatCollector{
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metrics: map[string]prometheus.Gauge{},
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}, nil
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}
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func (c *netStatCollector) Update(ch chan<- prometheus.Metric) (err error) {
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netStats, err := getNetStats()
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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 protocol, protocolStats := range netStats {
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for name, value := range protocolStats {
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key := protocol + "_" + name
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if _, ok := c.metrics[key]; !ok {
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c.metrics[key] = prometheus.NewGauge(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: netStatsSubsystem,
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Name: key,
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Help: fmt.Sprintf("%s %s from /proc/net/netstat.", protocol, name),
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},
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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].Set(v)
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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 getNetStats() (map[string]map[string]string, error) {
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file, err := os.Open(procNetStat)
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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 parseNetStats(file)
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}
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func parseNetStats(r io.Reader) (map[string]map[string]string, error) {
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var (
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netStats = map[string]map[string]string{}
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scanner = bufio.NewScanner(r)
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)
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for scanner.Scan() {
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nameParts := strings.Split(string(scanner.Text()), " ")
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scanner.Scan()
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valueParts := strings.Split(string(scanner.Text()), " ")
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// Remove trailing :.
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protocol := nameParts[0][:len(nameParts[0])-1]
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netStats[protocol] = map[string]string{}
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if len(nameParts) != len(valueParts) {
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return nil, fmt.Errorf("mismatch field count mismatch in %s: %s",
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procNetStat, protocol)
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}
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for i := 1; i < len(nameParts); i++ {
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netStats[protocol][nameParts[i]] = valueParts[i]
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}
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}
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return netStats, nil
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}
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