Python:我如何使这些异步方法进行通信?

时间:2016-10-23 12:39:41

标签: python cherrypy python-asyncio aiohttp

我开始做异步代码,但我还是不完全理解它。

我编写了一个设置CherryPy Web服务器的程序,故意延迟返回GET请求。
然后我使用 aiohttp 模块发出异步请求。

我做了什么: 在等待响应时运行一些打印循环
我想要有效地做什么: 使循环运行,直到我得到响应(现在它继续运行)

那是我的代码:

import cherrypy
import time
import threading
import asyncio
import aiohttp


# The Web App
class CherryApp:
    @cherrypy.expose
    def index(self):
        time.sleep(5)
        return open('views/index.html')


async def get_page(url):
    session = aiohttp.ClientSession()
    resp = await session.get(url)
    return resp

async def waiter():

    # I want to break this loop when I get a response
    while True:
        print("Waiting for response")
        await asyncio.sleep(1)


if __name__ == '__main__':
    # Start the server
    server = threading.Thread(target=cherrypy.quickstart, args=[CherryApp()])
    server.start()

    # Run the async methods
    event_loop = asyncio.get_event_loop()
    tasks = [get_page('http://127.0.0.1:8080/'), waiter()]

    # Obviously, the 'waiter()' method never completes, so this just runs forever
    event_loop.run_until_complete(asyncio.wait(tasks))

那么,我如何制作异步功能"意识到"彼此?

1 个答案:

答案 0 :(得分:0)

使用变量,例如global ::

done = False

async def get_page(url):
    global done
    session = aiohttp.ClientSession()
    resp = await session.get(url)
    done = True
    return resp

async def waiter():
    while not done:
        print("Waiting for response")
        await asyncio.sleep(1)
    print("done!")