Question

我遇到了Tornado中异步函数的模糊情况。

我一直在研究的系统只接收POST请求并异步提供它们。但现在我必须为服务IE8用户添加GET请求处理。问题是GET请求功能完全与post请求相同。

我不想简单地复制粘贴我的代码，所以我来到了以下解决方案：

class ExampleHandler(BaseHandler):

    def _request_action(self):
        """ Function that incapsulates all actions, that should be performed in request
        """
        yield self.motor.col1.insert({"ex1": 1})
        raise Return

    @gen.coroutine
    def get(self):
        """ GET request handler - need for IE8- users. Used ONLY for them
        """
        self._request_action()

    @gen.coroutine
    def post(self):
        """ POST handling for all users, except IE8-
        """
        self._request_action()

我对异步装饰器有很多疑问。是否足以在装饰器中包装GET / POST处理程序，并将应该执行的所有操作放在同步工作函数中？或者我也应该把它包起来？

Answer 1

如果您yield在函数内部Future，则必须使用@gen.coroutine对其进行换行。

所以，用_request_action

包裹@gen.coroutine

@gen.coroutine
def _request_action(self):
    """ Function that incapsulates all actions, that should be performed in request
    """
    result = yield self.motor.col1.insert({"ex1": 1})
    raise gen.Return(result)  # that is how you can return result from coroutine

此外，所有协同程序必须由yield调用：

@gen.coroutine
def get(self):
    """ GET request handler - need for IE8- users. Used ONLY for them
    """
    result = yield self._request_action()
    # do something with result, if you need

@gen.coroutine
def post(self):
    """ POST handling for all users, except IE8-
    """
    result = yield self._request_action()
    # do something with result, if you need

在函数中封装异步操作

1 个答案: