tornado异步之协程异步

# -*- coding: utf-8 -*-
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import tornado.httpclient

import json


from tornado.options import define, options
define("port", default=8000, help="run on the given port", type=int)


class IndexHandler(tornado.web.RequestHandler):
    @tornado.gen.coroutine
    def get(self):
        http = tornado.httpclient.AsyncHTTPClient()
        response = yield http.fetch(
            "https://rdnsdb.com/api/rdns/?ip=14.130.112.24",
        )
        if response.error:
            self.send_error(500)
        else:
            data = json.loads(response.body)

            if data["status"]:
                self.write(data["data"])
            else:
                self.write("查询IP信息错误")


if __name__ == "__main__":
    tornado.options.parse_command_line()
    app = tornado.web.Application(handlers=[(r"/", IndexHandler)])
    http_server = tornado.httpserver.HTTPServer(app)
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()

 

协程异步使用步骤：

1、使用装饰器

@tornado.gen.coroutine

2、使用yield

 

拆分异步请求：

# -*- coding: utf-8 -*-
import tornado.httpserver
import tornado.ioloop
import tornado.options
import tornado.web
import tornado.httpclient

import json


from tornado.options import define, options
define("port", default=8000, help="run on the given port", type=int)


class IndexHandler(tornado.web.RequestHandler):
    @tornado.gen.coroutine
    def get(self):
        # 异步调用
        rep = yield self.get_ip_info("14.130.112.24")
        if rep["status"]:
            self.write(rep["data"])
        else:
            self.write("查询IP信息错误")

    # 将异步web请求独立出来
    @tornado.gen.coroutine
    def get_ip_info(self, ip):
        http = tornado.httpclient.AsyncHTTPClient()
        response = yield http.fetch(
            "https://rdnsdb.com/api/rdns/?ip=" + ip,
        )
        if response.error:
            rep = {"status": False}
        else:
            rep = json.loads(response.body)

        raise tornado.gen.Return(rep)


if __name__ == "__main__":
    tornado.options.parse_command_line()
    app = tornado.web.Application(handlers=[(r"/", IndexHandler)])
    http_server = tornado.httpserver.HTTPServer(app)
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()