mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-28 23:19:46 -08:00
129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
// Copyright 2015 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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// +build !nonetdev
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package collector
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"os"
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"regexp"
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"strconv"
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"strings"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
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)
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var (
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procNetDevFieldSep = regexp.MustCompile("[ :] *")
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netdevIgnoredDevices = flag.String(
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"collector.netdev.ignored-devices", "^$",
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"Regexp of net devices to ignore for netdev collector.")
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)
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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
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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 prometheus registry and returns a new Collector exposing
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// network device stats.
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func NewNetDevCollector() (Collector, error) {
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pattern := regexp.MustCompile(*netdevIgnoredDevices)
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return &netDevCollector{
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subsystem: "network",
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ignoredDevicesPattern: pattern,
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metricDescs: map[string]*prometheus.Desc{},
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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(c.ignoredDevicesPattern)
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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 dev, devStats := range netDev {
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for key, value := range devStats {
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desc, ok := c.metricDescs[key]
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if !ok {
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desc = prometheus.NewDesc(
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prometheus.BuildFQName(Namespace, c.subsystem, key),
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fmt.Sprintf("Network device statistic %s.", key),
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[]string{"device"},
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nil,
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)
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c.metricDescs[key] = desc
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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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ch <- prometheus.MustNewConstMetric(desc, prometheus.GaugeValue, v, dev)
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}
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}
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return nil
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}
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func getNetDevStats(ignore *regexp.Regexp) (map[string]map[string]string, error) {
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file, err := os.Open(procFilePath("net/dev"))
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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, ignore)
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}
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func parseNetDevStats(r io.Reader, ignore *regexp.Regexp) (map[string]map[string]string, error) {
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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 net/dev: %s",
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scanner.Text())
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}
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header := strings.Fields(parts[1])
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netDev := map[string]map[string]string{}
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for scanner.Scan() {
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line := strings.TrimLeft(string(scanner.Text()), " ")
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parts := procNetDevFieldSep.Split(line, -1)
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if len(parts) != 2*len(header)+1 {
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return nil, fmt.Errorf("invalid line in net/dev: %s", scanner.Text())
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}
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dev := parts[0][:len(parts[0])]
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if ignore.MatchString(dev) {
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log.Debugf("Ignoring device: %s", dev)
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continue
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}
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netDev[dev] = map[string]string{}
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for i, v := range header {
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netDev[dev]["receive_"+v] = parts[i+1]
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netDev[dev]["transmit_"+v] = parts[i+1+len(header)]
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}
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}
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return netDev, nil
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}
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