node_exporter/collector/netdev_linux.go

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// +build !nonetdev
package collector
import (
"bufio"
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"flag"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
)
const (
procNetDev = "/proc/net/dev"
)
var (
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procNetDevFieldSep = regexp.MustCompile("[ :] *")
netdevIgnoredDevices = flag.String(
"collector.netdev.ignored-devices", "^$",
"Regexp of net devices to ignore for netdev collector.")
)
type netDevCollector struct {
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subsystem string
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ignoredDevicesPattern *regexp.Regexp
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metricDescs map[string]*prometheus.Desc
}
func init() {
Factories["netdev"] = NewNetDevCollector
}
// Takes a prometheus registry and returns a new Collector exposing
// network device stats.
func NewNetDevCollector() (Collector, error) {
pattern := regexp.MustCompile(*netdevIgnoredDevices)
return &netDevCollector{
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subsystem: "network",
ignoredDevicesPattern: pattern,
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metricDescs: map[string]*prometheus.Desc{},
}, nil
}
func (c *netDevCollector) Update(ch chan<- prometheus.Metric) (err error) {
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netDev, err := getNetDevStats(c.ignoredDevicesPattern)
if err != nil {
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return fmt.Errorf("couldn't get netstats: %s", err)
}
for dev, devStats := range netDev {
for key, value := range devStats {
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desc, ok := c.metricDescs[key]
if !ok {
desc = prometheus.NewDesc(
prometheus.BuildFQName(Namespace, c.subsystem, key),
fmt.Sprintf("%s from /proc/net/dev.", key),
[]string{"device"},
nil,
)
c.metricDescs[key] = desc
}
v, err := strconv.ParseFloat(value, 64)
if err != nil {
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return fmt.Errorf("invalid value %s in netstats: %s", value, err)
}
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ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, v, dev)
}
}
return nil
}
func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]string, error) {
file, err := os.Open(procNetDev)
if err != nil {
return nil, err
}
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defer file.Close()
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return parseNetDevStats(file, ignore)
}
func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string]string, error) {
scanner := bufio.NewScanner(r)
scanner.Scan() // skip first header
scanner.Scan()
parts := strings.Split(string(scanner.Text()), "|")
if len(parts) != 3 { // interface + receive + transmit
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return nil, fmt.Errorf("invalid header line in %s: %s",
procNetDev, scanner.Text())
}
header := strings.Fields(parts[1])
netDev := map[string]map[string]string{}
for scanner.Scan() {
line := strings.TrimLeft(string(scanner.Text()), " ")
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parts := procNetDevFieldSep.Split(line, -1)
if len(parts) != 2*len(header)+1 {
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return nil, fmt.Errorf("invalid line in %s: %s", procNetDev, scanner.Text())
}
dev := parts[0][:len(parts[0])]
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if ignore.MatchString(dev) {
log.Debugf("Ignoring device: %s", dev)
continue
}
netDev[dev] = map[string]string{}
for i, v := range header {
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netDev[dev]["receive_"+v] = parts[i+1]
netDev[dev]["transmit_"+v] = parts[i+1+len(header)]
}
}
return netDev, nil
}