Move cover bytes to filesystem storage

backend/main.go

@@ -30,7 +30,11 @@ type Config struct {
 	// DatabaseURL is the Postgres connection URL; required, no default,
 	// because a wrong guess would silently start on an empty database.
 	DatabaseURL string
-	Port        string
+	// CoverDir is the filesystem volume for immutable cover bytes. Required:
+	// serving a stored address without durable bytes would be worse than a
+	// startup failure.
+	CoverDir string
+	Port     string
 	// OwnerDiscordID identifies the seeded owner Reader (issue #22). Required:
 	// bookmarks are scoped to a Reader, and a fresh deployment needs one
 	// before anybody logs in. The owner is also the only Reader who can revoke
@@ -167,6 +171,7 @@ func loadConfig() Config {
 	c := Config{
 		TokenKey:            os.Getenv("TOKEN_KEY"),
 		DatabaseURL:         os.Getenv("DATABASE_URL"),
+		CoverDir:            os.Getenv("COVER_DIR"),
 		Port:                envOr("PORT", "8080"),
 		OwnerDiscordID:      os.Getenv("OWNER_DISCORD_ID"),
 		UserscriptPath:      envOr("USERSCRIPT_PATH", "/userscript/manga-bookmark.user.js"),
@@ -254,6 +259,9 @@ func main() {
 	if cfg.DatabaseURL == "" {
 		log.Fatal("DATABASE_URL is required")
 	}
+	if cfg.CoverDir == "" {
+		log.Fatal("COVER_DIR is required")
+	}
 	// The web UI signs in through Discord, so a deployment without the OAuth
 	// application is misconfigured rather than passwordless.
 	for key, v := range map[string]string{
@@ -274,7 +282,7 @@ func main() {
 		TokenHash: token.Hash(token.Token([]byte(cfg.TokenKey), cfg.OwnerDiscordID, 0)),
 	}
 
-	s, err := store.Open(cfg.DatabaseURL, owner)
+	s, err := store.Open(cfg.DatabaseURL, owner, cfg.CoverDir)
 	if err != nil {
 		log.Fatalf("open store: %v", err)
 	}