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