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// Copyright 2015 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"fmt"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"sort"
"strings"
"sync"
"syscall"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/node_exporter/collector"
)
const subsystem = "exporter"
var (
// Version of node_exporter. Set at build time.
Version = "0.0.0.dev"
memProfile = flag.String("debug.memprofile-file", "", "Write memory profile to this file upon receipt of SIGUSR1.")
listenAddress = flag.String("web.listen-address", ":9100", "Address on which to expose metrics and web interface.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
enabledCollectors = flag.String("collectors.enabled",
filterAvailableCollectors("conntrack,diskstats,filefd,filesystem,loadavg,mdadm,meminfo,netdev,netstat,sockstat,stat,textfile,time,uname"),
"Comma-separated list of collectors to use.")
printCollectors = flag.Bool("collectors.print", false, "If true, print available collectors and exit.")
collectorLabelNames = []string{"collector", "result"}
scrapeDurations = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Namespace: collector.Namespace,
Subsystem: subsystem,
Name: "scrape_duration_seconds",
Help: "node_exporter: Duration of a scrape job.",
},
collectorLabelNames,
)
)
// NodeCollector implements the prometheus.Collector interface.
type NodeCollector struct {
collectors map[string]collector.Collector
}
// Describe implements the prometheus.Collector interface.
func (n NodeCollector) Describe(ch chan<- *prometheus.Desc) {
scrapeDurations.Describe(ch)
}
// Collect implements the prometheus.Collector interface.
func (n NodeCollector) Collect(ch chan<- prometheus.Metric) {
wg := sync.WaitGroup{}
wg.Add(len(n.collectors))
for name, c := range n.collectors {
go func(name string, c collector.Collector) {
execute(name, c, ch)
wg.Done()
}(name, c)
}
wg.Wait()
scrapeDurations.Collect(ch)
}
func filterAvailableCollectors(collectors string) string {
availableCollectors := make([]string, 0)
for _, c := range strings.Split(collectors, ",") {
_, ok := collector.Factories[c]
if ok {
availableCollectors = append(availableCollectors, c)
}
}
return strings.Join(availableCollectors, ",")
}
func execute(name string, c collector.Collector, ch chan<- prometheus.Metric) {
begin := time.Now()
err := c.Update(ch)
duration := time.Since(begin)
var result string
if err != nil {
log.Errorf("ERROR: %s collector failed after %fs: %s", name, duration.Seconds(), err)
result = "error"
} else {
log.Debugf("OK: %s collector succeeded after %fs.", name, duration.Seconds())
result = "success"
}
scrapeDurations.WithLabelValues(name, result).Observe(duration.Seconds())
}
func loadCollectors() (map[string]collector.Collector, error) {
collectors := map[string]collector.Collector{}
for _, name := range strings.Split(*enabledCollectors, ",") {
fn, ok := collector.Factories[name]
if !ok {
return nil, fmt.Errorf("collector '%s' not available", name)
}
c, err := fn()
if err != nil {
return nil, err
}
collectors[name] = c
}
return collectors, nil
}
func main() {
flag.Parse()
if *printCollectors {
collectorNames := make(sort.StringSlice, 0, len(collector.Factories))
for n := range collector.Factories {
collectorNames = append(collectorNames, n)
}
collectorNames.Sort()
fmt.Printf("Available collectors:\n")
for _, n := range collectorNames {
fmt.Printf(" - %s\n", n)
}
return
}
collectors, err := loadCollectors()
if err != nil {
log.Fatalf("Couldn't load collectors: %s", err)
}
log.Infof("Enabled collectors:")
for n := range collectors {
log.Infof(" - %s", n)
}
nodeCollector := NodeCollector{collectors: collectors}
prometheus.MustRegister(nodeCollector)
sigUsr1 := make(chan os.Signal)
signal.Notify(sigUsr1, syscall.SIGUSR1)
handler := prometheus.Handler()
http.Handle(*metricsPath, handler)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Node Exporter</title></head>
<body>
<h1>Node Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body>
</html>`))
})
log.Infof("Starting node_exporter v%s at %s", Version, *listenAddress)
err = http.ListenAndServe(*listenAddress, nil)
if err != nil {
log.Fatal(err)
}
}
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