ilo4_exporter/main.go at master · gperiard/ilo4_exporter · GitHub

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package main

import (
	"flag"
	"fmt"
	"net/http"
	"os"

	"github.com/MauveSoftware/ilo4_exporter/chassis"
	"github.com/MauveSoftware/ilo4_exporter/client"
	"github.com/MauveSoftware/ilo4_exporter/system"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
	"github.com/prometheus/common/log"
	"github.com/sirupsen/logrus"
)

const version string = "0.3.0"

var (
	showVersion           = flag.Bool("version", false, "Print version information.")
	listenAddress         = flag.String("web.listen-address", ":9545", "Address on which to expose metrics and web interface.")
	metricsPath           = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
	username              = flag.String("api.username", "", "Username")
	password              = flag.String("api.password", "", "Password")
	maxConcurrentRequests = flag.Uint("api.max-concurrent-requests", 4, "Maximum number of requests sent against API concurrently")
)

func init() {
	flag.Usage = func() {
		fmt.Println("Usage: ilo4_exporter [ ... ]\n\nParameters:")
		fmt.Println()
		flag.PrintDefaults()
	}
}

func main() {
	flag.Parse()

	if *showVersion {
		printVersion()
		os.Exit(0)
	}

	startServer()
}

func printVersion() {
	fmt.Println("ilo4_exporter")
	fmt.Printf("Version: %s\n", version)
	fmt.Println("Author(s): Daniel Czerwonk")
	fmt.Println("Copyright: 2020, Mauve Mailorder Software GmbH & Co. KG, Licensed under MIT license")
	fmt.Println("Metric exporter for HP iLO4")
}

func startServer() {
	logrus.Infof("Starting iLO4 exporter (Version: %s)", version)
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte(`<html>
			<head><title>iLO4 Exporter (Version ` + version + `)</title></head>
			<body>
			<h1>iLO4 Exporter by Mauve Mailorder Software</h1>
			<h2>Example</h2>
			<p>Metrics for host 172.16.0.200</p>
			<p><a href="` + *metricsPath + `?host=172.16.0.200">` + r.Host + *metricsPath + `?host=172.16.0.200</a></p>
			<h2>More information</h2>
			<p><a href="https://github.com/MauveSoftware/ilo4_exporter">github.com/MauveSoftware/ilo4_exporter</a></p>
			</body>
			</html>`))
	})
	http.HandleFunc(*metricsPath, errorHandler(handleMetricsRequest))

	logrus.Infof("Listening for %s on %s", *metricsPath, *listenAddress)
	logrus.Fatal(http.ListenAndServe(*listenAddress, nil))
}

func errorHandler(f func(http.ResponseWriter, *http.Request) error) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		err := f(w, r)

		if err != nil {
			logrus.Errorln(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
		}
	}
}

func handleMetricsRequest(w http.ResponseWriter, r *http.Request) error {
	host := r.URL.Query().Get("host")

	if host == "" {
		return fmt.Errorf("no host defined")
	}

	reg := prometheus.NewRegistry()

	cl := client.NewClient(host, *username, *password, client.WithMaxConcurrentRequests(*maxConcurrentRequests), client.WithInsecure())
	reg.MustRegister(system.NewCollector(cl))
	reg.MustRegister(chassis.NewCollector(cl))

	promhttp.HandlerFor(reg, promhttp.HandlerOpts{
		ErrorLog:      log.NewErrorLogger(),
		ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
	return nil
}