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main.go
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// SPDX-FileCopyrightText: (c) Mauve Mailorder Software GmbH & Co. KG, 2022. Licensed under [MIT](LICENSE) license.
//
// SPDX-License-Identifier: MIT
package main
import (
"context"
"flag"
"fmt"
"log"
"net/http"
"os"
"os/signal"
"github.com/MauveSoftware/ilo5_exporter/pkg/chassis"
"github.com/MauveSoftware/ilo5_exporter/pkg/client"
"github.com/MauveSoftware/ilo5_exporter/pkg/system"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
)
const version string = "0.1.0"
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("web.listen-address", ":19545", "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")
tlsEnabled = flag.Bool("tls.enabled", false, "Enables TLS")
tlsCertChainPath = flag.String("tls.cert-file", "", "Path to TLS cert file")
tlsKeyPath = flag.String("tls.key-file", "", "Path to TLS key file")
tracingEnabled = flag.Bool("tracing.enabled", false, "Enables tracing using OpenTelemetry")
tracingProvider = flag.String("tracing.provider", "", "Sets the tracing provider (stdout or collector)")
tracingCollectorEndpoint = flag.String("tracing.collector.grpc-endpoint", "", "Sets the tracing provider (stdout or collector)")
)
func init() {
flag.Usage = func() {
fmt.Println("Usage: ilo5_exporter [ ... ]\n\nParameters:")
fmt.Println()
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
if *showVersion {
printVersion()
os.Exit(0)
}
ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt)
defer cancel()
shutdownTracing, err := initTracing(ctx)
if err != nil {
log.Fatalf("could not initialize tracing: %v", err)
}
defer shutdownTracing()
startServer()
}
func printVersion() {
fmt.Println("ilo5_exporter")
fmt.Printf("Version: %s\n", version)
fmt.Println("Author(s): Daniel Czerwonk")
fmt.Println("Copyright: 2022, Mauve Mailorder Software GmbH & Co. KG, Licensed under MIT license")
fmt.Println("Metric exporter for HP iLO5")
}
func startServer() {
logrus.Infof("Starting iLO5 exporter (Version: %s)", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>iLO5 Exporter (Version ` + version + `)</title></head>
<body>
<h1>iLO5 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/ilo5_exporter">github.com/MauveSoftware/ilo5_exporter</a></p>
</body>
</html>`))
})
http.HandleFunc(*metricsPath, errorHandler(handleMetricsRequest))
logrus.Infof("Listening for %s on %s (TLS: %v)", *metricsPath, *listenAddress, *tlsEnabled)
if *tlsEnabled {
logrus.Fatal(http.ListenAndServeTLS(*listenAddress, *tlsCertChainPath, *tlsKeyPath, nil))
return
}
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")
ctx, span := tracer.Start(r.Context(), "HandleMetricsRequest", trace.WithAttributes(
attribute.String("host", host),
))
defer span.End()
if host == "" {
return fmt.Errorf("no host defined")
}
reg := prometheus.NewRegistry()
cl := client.NewClient(host, *username, *password, tracer, client.WithMaxConcurrentRequests(*maxConcurrentRequests), client.WithInsecure(), client.WithDebug())
reg.MustRegister(system.NewCollector(ctx, cl, tracer))
reg.MustRegister(chassis.NewCollector(ctx, cl, tracer))
l := logrus.New()
l.Level = logrus.ErrorLevel
promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: l,
ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
return nil
}