Initial DDC release

main.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"syscall"
+	"time"
+
+	"ddc/internal/auth"
+	"ddc/internal/config"
+	"ddc/internal/jobs"
+	"ddc/internal/preferences"
+	"ddc/internal/server"
+)
+
+const settingsFileName = ".settings.json"
+
+func main() {
+	settings, err := config.Load()
+	if err != nil {
+		log.Fatalf("configuration error: %v", err)
+	}
+
+	if err := os.MkdirAll(settings.DownloadDir, 0o755); err != nil {
+		log.Fatalf("download directory error: %v", err)
+	}
+	resolvedDownloadDir, err := filepath.EvalSymlinks(settings.DownloadDir)
+	if err != nil {
+		log.Fatalf("download directory error: %v", err)
+	}
+	settings.DownloadDir = resolvedDownloadDir
+	if err := ensureWritable(settings.DownloadDir); err != nil {
+		log.Fatalf("download directory %s is not writable by uid %d gid %d: %v", settings.DownloadDir, os.Getuid(), os.Getgid(), err)
+	}
+
+	store, err := preferences.Open(filepath.Join(settings.DownloadDir, settingsFileName), settings.Defaults)
+	if err != nil {
+		log.Fatalf("settings error: %v", err)
+	}
+
+	manager := jobs.NewManager(settings, store)
+	if err := manager.RestoreExisting(); err != nil {
+		log.Printf("could not restore existing downloads: %v", err)
+	}
+
+	sessions := auth.NewSessionStore(settings.SessionTTL)
+	httpServer := &http.Server{
+		Addr:              settings.ListenAddr,
+		Handler:           server.New(settings, sessions, manager),
+		ReadHeaderTimeout: 10 * time.Second,
+		ReadTimeout:       30 * time.Second,
+		WriteTimeout:      60 * time.Second,
+		IdleTimeout:       120 * time.Second,
+	}
+
+	shutdownSignal, stopListening := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stopListening()
+
+	go func() {
+		log.Printf("listening on %s", settings.ListenAddr)
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatalf("server error: %v", err)
+		}
+	}()
+
+	<-shutdownSignal.Done()
+	log.Printf("shutting down")
+	manager.CancelAll()
+
+	shutdownContext, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	if err := httpServer.Shutdown(shutdownContext); err != nil {
+		log.Printf("shutdown error: %v", err)
+	}
+}
+
+func ensureWritable(directory string) error {
+	probe, err := os.CreateTemp(directory, ".write-test-*")
+	if err != nil {
+		return err
+	}
+	probe.Close()
+	return os.Remove(probe.Name())
+}