tornado coroutine使用

矫情吗；* 2022-07-15 01:29 210阅读 0赞

工作中想在tornado里面封装个异步发送http请求的公共方法，代码如下：

@tornado.gen.engine
    def asyn_send_http_req(reqUrl, parm):
            try:
                client = tornado.httpclient.AsyncHTTPClient()
                httpReq = tornado.httpclient.HTTPRequest(reqUrl,method="POST",body=parm,connect_timeout=3)
                response = yield tornado.gen.Task(client.fetch,httpReq)
                response = response.body
                logging.info(response)
            except Exception:
                response = None
            if response and response.strip():
                pass else:
                response = None

yield response

response = asyn_send_http_req(reqUrl,parm)

获取响应总是报错，后来查了下资料，原来是generator里面不能return。需要使用tornado的

tornado.gen.Task 来返回响应，代码如下：

@tornado.gen.engine
    def asyn_send_http_req(reqUrl, parm,callback=None):
            try:
                client = tornado.httpclient.AsyncHTTPClient()
                httpReq = tornado.httpclient.HTTPRequest(reqUrl,method="POST",body=parm,connect_timeout=3)
                response = yield tornado.gen.Task(client.fetch,httpReq)
                response = response.body
                logging.info(response)
            except Exception:
                response = None
            if response and response.strip():
                pass else:
                response = None
            callback(response) response = yield tornado.gen.Task(asyn_send_http_req,reqUrl,parm) 使用callback返回响应。 @tornado.gen.engine 是3.0 版本前使用，现在不建议使用，3.0后使用@tornado.gen.coroutine替代。 @tornado.gen.coroutine
    def asyn_send_http_req(reqUrl, parm):
            try:
                client = tornado.httpclient.AsyncHTTPClient()
                httpReq = tornado.httpclient.HTTPRequest(reqUrl,method="POST",body=parm,connect_timeout=3)
                response = yield tornado.gen.Task(client.fetch,httpReq)
                response = response.body
                logging.info(response)
            except Exception:
                response = None
            if response and response.strip():
                pass else:
                response = None
            raise gen.Return(response)同时使用gen.Return（）方法返回响应。 OK，问题解决。