feat: initialize independent Bell product skeleton (#9)

Bell/server/cmd/bell/root.go

@@ -0,0 +1,61 @@
+package bell
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"git.ilapage.cn/ila/yovision/Bell/server/config"
+	"git.ilapage.cn/ila/yovision/Bell/server/internal/platform"
+)
+
+const Version = "0.1.0"
+
+func Run(ctx context.Context, args []string) error {
+	command := "serve"
+	if len(args) > 0 {
+		command = args[0]
+	}
+	if command == "version" {
+		fmt.Println(Version)
+		return nil
+	}
+	if command != "serve" && command != "migrate" {
+		return fmt.Errorf("unknown command %q (use serve, migrate, or version)", command)
+	}
+	cfg, err := config.Load()
+	if err != nil {
+		return err
+	}
+	db, err := platform.OpenDatabase(ctx, cfg.DatabaseURL)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+	if err := platform.Migrate(ctx, db); err != nil {
+		return err
+	}
+	if command == "migrate" {
+		return nil
+	}
+	app := platform.NewHTTPApp(db)
+	server := &http.Server{Addr: cfg.HTTPAddress, Handler: app.Handler()}
+	serverCtx, stop := signal.NotifyContext(ctx, os.Interrupt, syscall.SIGTERM)
+	defer stop()
+	go func() {
+		<-serverCtx.Done()
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), cfg.ShutdownTimeout)
+		defer cancel()
+		_ = server.Shutdown(shutdownCtx)
+	}()
+	slog.Info("Bell listening", "address", cfg.HTTPAddress, "environment", cfg.Environment)
+	if err := server.ListenAndServe(); !errors.Is(err, http.ErrServerClosed) {
+		return err
+	}
+	return nil
+}