Flask中的应用程序范围请求挂钩。如何实施？

Question

在应用程序工厂中定义共享请求挂钩是否可以？

def create_app(config_name):

    app = Flask(__name__)
    app.config.from_object(config[config_name])

    db.init_app(app)
    csrf.init_app(app)
    login_manager.init_app(app)
    babel.init_app(app)

    @app.before_request
    def before_request_callback():
        if request.view_args and 'locale' in request.view_args:
            if request.view_args['locale'] not in app.config['SUPPORTED_LOCALES']:
                return abort(404)
            g.locale = request.view_args['locale']
            request.view_args.pop('locale')

    from . app_area__main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    from . app_area__admin import admin as admin_blueprint
    app.register_blueprint(admin_blueprint, url_prefix='/admin')        

Answer 1

只需在主（app_area_main）蓝图中注册before_app_request的函数即可。例如：

@main_blueprint.before_app_request
def before_app_request():
    pass

所有传递给应用程序的请求都将调用该函数。

检查此link有关Flask中Blueprint的API的信息。