Tornado：异步端点答案

【问题标题】：Tornado: asynchronous endpointsTornado：异步端点
【发布时间】：2016-06-06 13:28:07
【问题描述】：

我有以下代码：

class StackOverflowHandler(tornado.web.RequestHandler):

    def get(self, look_up_pattern):
        url = "https://api.stackexchange.com/2.2/search?order=desc&sort=votes&intitle=%s&site=stackoverflow"
        response = self.async_get(url)
        print(response)
        self.write(response)

    @gen.coroutine
    def async_get(self, url):
        link = httpclient.AsyncHTTPClient()
        request = httpclient.HTTPRequest(url)
        response = yield link.fetch(request)
        data = response.body.decode('utf-8')
        data = json.loads(data)
        return data

application = tornado.web.Application([
    (r"/search/(.*)", StackOverflowHandler),
])

从async_get 返回的类型是tornado.concurrent.Future。

例外是：

TypeError: write() only accepts bytes, unicode, and dict objects

我是异步编程的新手，请指出我的错误。

【问题讨论】：

标签： python asynchronous tornado

【解决方案1】：

由于async_get 是协程，它返回Future 对象。为了获得“真实”的结果，Future 必须得到解决——它需要被屈服。更多 get 处理程序也必须装饰为异步

class StackOverflowHandler(tornado.web.RequestHandler):

    @gen.coroutine
    def get(self, look_up_pattern):
        url = "https://api.stackexchange.com/2.2/search?order=desc&sort=votes&intitle=%s&site=stackoverflow"
        response = yield self.async_get(url)
        print(response)
        self.write(response)

    @gen.coroutine
    def async_get(self, url):
        link = httpclient.AsyncHTTPClient()
        request = httpclient.HTTPRequest(url)
        response = yield link.fetch(request)
        data = response.body.decode('utf-8')
        data = json.loads(data)
        return data

【讨论】：