CableGUI/cmd/cablegui/main.go

package main

import (
	"context"
	"errors"
	"log"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"
	"time"

	"mgit.msbls.de/m/cablegui/internal/db"
	"mgit.msbls.de/m/cablegui/internal/server"
	"mgit.msbls.de/m/cablegui/web"
)

func main() {
	addr := envOr("CABLEGUI_ADDR", "0.0.0.0:7777")
	dbPath := envOr("CABLEGUI_DB", "./data/cablegui.db")

	if err := os.MkdirAll(filepath.Dir(dbPath), 0o755); err != nil {
		log.Fatalf("mkdir data dir: %v", err)
	}

	store, err := db.Open(dbPath)
	if err != nil {
		log.Fatalf("open db: %v", err)
	}
	defer store.Close()

	if err := db.Migrate(store.DB()); err != nil {
		log.Fatalf("migrate: %v", err)
	}

	srv := &http.Server{
		Addr:              addr,
		Handler:           server.New(store, web.Static()),
		ReadHeaderTimeout: 5 * time.Second,
	}

	go func() {
		log.Printf("cablegui listening on %s (db=%s)", addr, dbPath)
		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Fatalf("listen: %v", err)
		}
	}()

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
	<-stop
	log.Printf("shutting down")
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	_ = srv.Shutdown(ctx)
}

func envOr(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}