metacrypt/cmd/metacrypt-web/main.go

// metacrypt-web is the standalone web UI server for Metacrypt.
// It communicates with the vault over gRPC and can be restarted independently
// without requiring the vault to be re-unsealed.
package main

import (
	"context"
	"fmt"
	"log/slog"
	"os"
	"os/signal"
	"syscall"

	"github.com/spf13/cobra"

	"git.wntrmute.dev/mc/metacrypt/internal/config"
	"git.wntrmute.dev/mc/metacrypt/internal/webserver"
)

var cfgFile string

var rootCmd = &cobra.Command{
	Use:   "metacrypt-web",
	Short: "Metacrypt web UI server",
	Long:  "Standalone web UI server for Metacrypt. Communicates with the vault over gRPC.",
	RunE:  run,
}

func init() {
	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default /srv/metacrypt/metacrypt.toml)")
}

func run(cmd *cobra.Command, args []string) error {
	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelDebug}))

	configPath := cfgFile
	if configPath == "" {
		configPath = "/srv/metacrypt/metacrypt.toml"
	}

	cfg, err := config.Load(configPath)
	if err != nil {
		return err
	}

	if cfg.Web.VaultGRPC == "" {
		return fmt.Errorf("web.vault_grpc is required in config")
	}

	ws, err := webserver.New(cfg, logger)
	if err != nil {
		return err
	}

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	go func() {
		if err := ws.Start(); err != nil {
			logger.Error("web server error", "error", err)
			os.Exit(1)
		}
	}()

	<-ctx.Done()
	logger.Info("shutting down web server")
	return ws.Shutdown(context.Background())
}

func main() {
	if err := rootCmd.Execute(); err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}
}