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main.go
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main.go
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package main
import (
"fmt"
"log/slog"
"net/http"
"os"
"github.com/menzerath/aachen-verkehr-exporter/exporter"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// DefaultPort will be used if not overridden by using the PORT environment variable.
const DefaultPort = "9090"
func main() {
initLogging()
port := DefaultPort
if value, exists := os.LookupEnv("PORT"); exists {
port = value
}
slog.Info("starting exporter", slog.String("port", port))
prometheus.MustRegister(exporter.NewExporter())
http.Handle("/metrics", promhttp.Handler())
if err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil); err != nil && err != http.ErrServerClosed {
slog.Error("http listen", slog.Any("error", err))
os.Exit(1)
}
}
func initLogging() {
var handler slog.Handler
if os.Getenv("MODE") == "production" {
handler = slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{
Level: slog.LevelInfo,
})
} else {
handler = slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{
AddSource: true,
Level: slog.LevelDebug,
})
}
slog.SetDefault(slog.New(handler))
}