anotherim-desktop/plugins/omemo/src/plugin.vala

extern const string GETTEXT_PACKAGE;
extern const string LOCALE_INSTALL_DIR;

namespace Dino.Plugins.Omemo {

public class Plugin : RootInterface, Object {
    public const bool DEBUG = false;
    private static Signal.Context? _context;
    public static Signal.Context get_context() {
        assert(_context != null);
        return (!)_context;
    }
    public static bool ensure_context() {
        lock(_context) {
            try {
                if (_context == null) {
                    _context = new Signal.Context(DEBUG);
                }
                return true;
            } catch (Error e) {
                return false;
            }
        }
    }

    public Dino.Application app;
    public Database db;
    public EncryptionListEntry list_entry;
    public AccountSettingsEntry settings_entry;

    public void registered(Dino.Application app) {
        try {
            ensure_context();
            this.app = app;
            this.db = new Database(Path.build_filename(Application.get_storage_dir(), "omemo.db"));
            this.list_entry = new EncryptionListEntry(this);
            this.settings_entry = new AccountSettingsEntry(this);
            this.app.plugin_registry.register_encryption_list_entry(list_entry);
            this.app.plugin_registry.register_account_settings_entry(settings_entry);
            this.app.stream_interactor.module_manager.initialize_account_modules.connect((account, list) => {
                list.add(new StreamModule());
            });
            Manager.start(this.app.stream_interactor, db);

            string locales_dir;
            if (app.search_path_generator != null) {
                locales_dir = ((!)app.search_path_generator).get_locale_path(GETTEXT_PACKAGE, LOCALE_INSTALL_DIR);
            } else {
                locales_dir = LOCALE_INSTALL_DIR;
            }
            internationalize(GETTEXT_PACKAGE, locales_dir);
        } catch (Error e) {
            print(@"Error initializing OMEMO: $(e.message)\n");
        }
    }

    public void shutdown() {
        // Nothing to do
    }
}

}