How to use the cartoview.app_manager.decorators.rollback_on_failure function in cartoview

    @rollback_on_failure
    def add_carto_app(self):
        if not CartoviewApp.objects.app_exists(self.name):
            CartoviewApp({
                'name': self.name,
                'active': True,
                'order': self.get_app_order(),
                'pending': True
            })
            CartoviewApp.save()
        else:
            carto_app = CartoviewApp.objects.get(self.name)
            carto_app.pending = True
            carto_app.commit()
            CartoviewApp.save()

    @rollback_on_failure
    def add_carto_app(self):
        if not CartoviewApp.objects.app_exists(self.name):
            CartoviewApp({
                'name': self.name,
                'active': True,
                'order': self.get_app_order(),
                'pending': True
            })
            CartoviewApp.save()
        else:
            carto_app = CartoviewApp.objects.get(self.name)
            carto_app.pending = True
            carto_app.commit()
            CartoviewApp.save()

    @rollback_on_failure
    def get_app_order(self):
        apps = App.objects.all()
        max_value = apps.aggregate(
            Max('order'))['order__max'] if apps.exists() else 0
        return max_value + 1

    @rollback_on_failure
    def _install_requirements(self):
        try:
            libs_dir = os.path.join(self.app_dir, 'libs')
            req_installer = ReqInstaller(self.app_dir, target=libs_dir)
            req_installer.install_all()
        except BaseException as e:
            if not (isinstance(e, ReqFileException)
                    or isinstance(e, ReqFilePermissionException)):  # noqa
                raise e

    @rollback_on_failure
    def extract_move_app(self, zipped_app):
        extract_to = tempfile.mkdtemp()
        libs_dir = None
        zipped_app.extractall(extract_to)
        if self.upgrade and os.path.exists(self.app_dir):
            # move old version to temporary dir so that we can restore in
            # case of failure
            old_version_temp_dir = tempfile.mkdtemp()
            shutil.move(self.app_dir, old_version_temp_dir)
            old_lib_dir = os.path.join(old_version_temp_dir, 'libs')
            if os.path.isdir(old_lib_dir) and os.path.exists(old_lib_dir):
                libs_dir = old_lib_dir
        self.new_app_dir = os.path.join(extract_to, self.name)
        shutil.move(self.new_app_dir, settings.APPS_DIR)
        if libs_dir:
            shutil.copy(libs_dir, self.app_dir)

    @rollback_on_failure
    def add_app(self):
        # save app configuration
        app, created = App.objects.get_or_create(name=self.name)
        if created:
            if app.order is None or app.order == 0:
                app.order = self.get_app_order()
        self.add_carto_app()
        app = self.app_serializer.get_app_object(app)
        app.version = self.version.version
        app.installed_by = self.user
        app.store = AppStore.objects.filter(is_default=True).first()
        app.save()
        return app

    @rollback_on_failure
    def get_app_order(self):
        apps = App.objects.all()
        max_value = apps.aggregate(
            Max('order'))['order__max'] if apps.exists() else 0
        return max_value + 1

    @rollback_on_failure
    def _install_requirements(self):
        try:
            libs_dir = os.path.join(self.app_dir, 'libs')
            req_installer = ReqInstaller(self.app_dir, target=libs_dir)
            req_installer.install_all()
        except BaseException as e:
            if not (isinstance(e, ReqFileException)
                    or isinstance(e, ReqFilePermissionException)):  # noqa
                raise e

    @rollback_on_failure
    def extract_move_app(self, zipped_app):
        extract_to = tempfile.mkdtemp()
        libs_dir = None
        zipped_app.extractall(extract_to)
        if self.upgrade and os.path.exists(self.app_dir):
            # move old version to temporary dir so that we can restore in
            # case of failure
            old_version_temp_dir = tempfile.mkdtemp()
            shutil.move(self.app_dir, old_version_temp_dir)
            old_lib_dir = os.path.join(old_version_temp_dir, 'libs')
            if os.path.isdir(old_lib_dir) and os.path.exists(old_lib_dir):
                libs_dir = old_lib_dir
        self.new_app_dir = os.path.join(extract_to, self.name)
        shutil.move(self.new_app_dir, settings.APPS_DIR)
        if libs_dir:
            shutil.copy(libs_dir, self.app_dir)

    @rollback_on_failure
    def add_app(self):
        # save app configuration
        app, created = App.objects.get_or_create(name=self.name)
        if created:
            if app.order is None or app.order == 0:
                app.order = self.get_app_order()
        self.add_carto_app()
        app = self.app_serializer.get_app_object(app)
        app.version = self.version.version
        app.installed_by = self.user
        app.store = AppStore.objects.filter(is_default=True).first()
        app.save()
        return app