139 lines
4.1 KiB
Go
139 lines
4.1 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"github.com/fluepke/vodafone-station-exporter/collector"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/prometheus/common/promslog"
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stdlog "log"
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"log/slog"
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"net/http"
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"os"
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"reflect"
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"strings"
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)
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const version = "0.0.1"
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var logger *slog.Logger
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type slogWriter struct{}
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func (s *slogWriter) Write(p []byte) (n int, err error) {
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logger.Error("promhttp error", slog.String("err", string(p)))
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return len(p), nil
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}
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var (
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showVersion = flag.Bool("version", false, "Print version and exit")
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showMetrics = flag.Bool("show-metrics", false, "Show available metrics and exit")
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listenAddress = flag.String("web.listen-address", "[::]:9420", "Address to listen on")
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metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics")
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vodafoneStationUrl = flag.String("vodafone.station-url", "http://192.168.0.1", "Vodafone station URL. For bridge mode this is 192.168.100.1 (note: Configure a route if using bridge mode)")
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vodafoneStationPassword = flag.String("vodafone.station-password", "How is the default password calculated? mhmm", "Password for logging into the Vodafone station")
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vodafoneStationPasswordFile = flag.String("vodafone.station-password-file", "", "Path to a file containing the Vodafone station password (overrides -vodafone.station-password)")
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)
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func main() {
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flag.Parse()
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cfg := &promslog.Config{}
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logger = promslog.New(cfg)
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// Handle password from file if provided
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if *vodafoneStationPasswordFile != "" {
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data, err := os.ReadFile(*vodafoneStationPasswordFile)
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if err != nil {
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logger.Error("Failed to read password file", slog.String("err", err.Error()))
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os.Exit(2)
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}
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pw := string(data)
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pw = strings.TrimSpace(pw)
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vodafoneStationPassword = &pw
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}
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if *showMetrics {
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describeMetrics()
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os.Exit(0)
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}
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if *showVersion {
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fmt.Println("vodafone-station-exporter")
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fmt.Printf("Version: %s\n", version)
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fmt.Println("Author: @fluepke")
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fmt.Println("Prometheus Exporter for the Vodafone Station (CGA4233DE)")
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os.Exit(0)
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}
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startServer()
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}
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func describeMetrics() {
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fmt.Println("Exported metrics")
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c := &collector.Collector{}
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ch := make(chan *prometheus.Desc)
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go func() {
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defer close(ch)
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c.Describe(ch)
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}()
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for desc := range ch {
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if desc == nil {
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continue
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}
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describeMetric(desc)
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}
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}
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func describeMetric(desc *prometheus.Desc) {
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fqName := reflect.ValueOf(desc).Elem().FieldByName("fqName").String()
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help := reflect.ValueOf(desc).Elem().FieldByName("help").String()
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labels := reflect.ValueOf(desc).Elem().FieldByName("variableLabels")
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fmt.Println(" * `" + fqName + "`: " + help)
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if labels.Len() == 0 {
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return
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}
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fmt.Print(" - Labels: ")
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first := true
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for i := 0; i < labels.Len(); i++ {
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if !first {
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fmt.Print(", ")
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}
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first = false
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fmt.Print("`" + labels.Index(i).String() + "`")
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}
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fmt.Println("")
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}
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func startServer() {
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logger.Info("Starting vodafone-station-exporter", slog.String("version", version))
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Write([]byte(`<html>
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<head><title>vodafone-station-exporter (Version ` + version + `)</title></head>
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<body>
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<h1>vodafone-station-exporter</h1>
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<a href="/metrics">metrics</a>
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</body>
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</html>`))
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})
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http.HandleFunc(*metricsPath, handleMetricsRequest)
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logger.Info("Listening on address", slog.String("address", *listenAddress))
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if err := http.ListenAndServe(*listenAddress, nil); err != nil {
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logger.Error("HTTP server failed", slog.String("err", err.Error()))
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os.Exit(1)
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}
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}
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func handleMetricsRequest(w http.ResponseWriter, request *http.Request) {
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registry := prometheus.NewRegistry()
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registry.MustRegister(&collector.Collector{
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Station: collector.NewVodafoneStation(*vodafoneStationUrl, *vodafoneStationPassword),
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Logger: logger,
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})
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promhttp.HandlerFor(registry, promhttp.HandlerOpts{
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ErrorLog: stdlog.New(&slogWriter{}, "", 0),
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ErrorHandling: promhttp.ContinueOnError,
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}).ServeHTTP(w, request)
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}
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