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package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"sort"
"strings"
"sync"
"syscall"
"time"
"github.com/golang/glog"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/node_exporter/collector"
)
const subsystem = "exporter"
var (
// set at build time
Version = "0.0.0.dev"
configFile = flag.String("config.file", "", "Path to config file.")
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", "attributes,diskstats,filesystem,loadavg,meminfo,stat,textfile,time,netdev,netstat", "Comma-separated list of collectors to use.")
printCollectors = flag.Bool("collectors.print", false, "If true, print available collectors and exit.")
authUser = flag.String("auth.user", "", "Username for basic auth.")
authPass = flag.String("auth.pass", "", "Password for basic auth.")
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,
)
)
// Implements Collector.
type NodeCollector struct {
collectors map[string]collector.Collector
}
// Implements Collector.
func (n NodeCollector) Describe(ch chan<- *prometheus.Desc) {
scrapeDurations.Describe(ch)
}
// Implements Collector.
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)
}
type basicAuthHandler struct {
handler http.HandlerFunc
user string
password string
}
func (h *basicAuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
user, password, ok := r.BasicAuth()
if !ok || password != h.password || user != h.user {
w.Header().Set("WWW-Authenticate", "Basic realm=\"metrics\"")
http.Error(w, "Invalid username or password", http.StatusUnauthorized)
return
}
h.handler(w, r)
return
}
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 {
glog.Infof("ERROR: %s failed after %fs: %s", name, duration.Seconds(), err)
result = "error"
} else {
glog.Infof("OK: %s success after %fs.", name, duration.Seconds())
result = "success"
}
scrapeDurations.WithLabelValues(name, result).Observe(duration.Seconds())
}
func getConfig(file string) (*collector.Config, error) {
config := &collector.Config{}
glog.Infof("Reading config %s", *configFile)
bytes, err := ioutil.ReadFile(*configFile)
if err != nil {
return nil, err
}
return config, json.Unmarshal(bytes, &config)
}
func loadCollectors(file string) (map[string]collector.Collector, error) {
collectors := map[string]collector.Collector{}
config := &collector.Config{}
if file != "" {
var err error
config, err = getConfig(file)
if err != nil {
return nil, fmt.Errorf("couldn't read config %s: %s", file, err)
}
}
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(*config)
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(*configFile)
if err != nil {
glog.Fatalf("Couldn't load config and collectors: %s", err)
}
glog.Infof("Enabled collectors:")
for n, _ := range collectors {
glog.Infof(" - %s", n)
}
nodeCollector := NodeCollector{collectors: collectors}
prometheus.MustRegister(nodeCollector)
sigUsr1 := make(chan os.Signal)
signal.Notify(sigUsr1, syscall.SIGUSR1)
handler := prometheus.Handler()
if *authUser != "" || *authPass != "" {
if *authUser == "" || *authPass == "" {
glog.Fatal("You need to specify -auth.user and -auth.pass to enable basic auth")
}
handler = &basicAuthHandler{
handler: prometheus.Handler().ServeHTTP,
user: *authUser,
password: *authPass,
}
}
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>`))
})
glog.Infof("Starting node_exporter v%s at %s", Version, *listenAddress)
err = http.ListenAndServe(*listenAddress, nil)
if err != nil {
glog.Fatal(err)
}
}
|
