Python 非阻塞服务器

Question

我尝试编写简单的非阻塞 http 服务器。我无法同时管理所有例程（Task1、Task2 和服务器）运行。无论我做什么服务器块。

import asyncio
from aiohttp import web


async def Task1():
    for i in range(100):
        print ('Task-1',i)
        await asyncio.sleep(1)


async def Task2():
    for i in range(100):
        print ('Task-2',i)
        await asyncio.sleep(2)

async def handle(request):
    name = request.match_info.get('name', "Anonymous")
    text = "Hello, " + name
    return web.Response(text=text)



app = web.Application()
app.add_routes([web.get('/', handle), web.get('/{name}', handle)])


loop=asyncio.new_event_loop()
loop.create_task(Task1())
loop.create_task(Task2())
loop.create_task(web.run_app(app)) #with this line commented task1/2 works
loop.run_forever()

预期结果应在服务器运行时打印在终端上。但是我得到了终端输出或服务器运行ning（从末尾开始评论第二行），但两者都想要。

Task-1 0
Task-2 0
Task-1 1
Task-2 1
Task-1 2
Task-1 3
Task-2 2
Task-1 4
Task-1 5
Task-2 3
Task-1 6
---more---

Answer 1

run_app 是一个方便的函数，它设置服务器并且运行事件循环直到服务器关闭。它是一个用于简单示例的同步函数，因此不打算传递给 create_task。 create_task 没有引发异常的唯一原因是因为 run_app 从来没有 returns，所以最后的 create_task 实际上没有被调用。

要获得对事件循环的控制权并向其中添加其他任务，您可以使用 AppRunner 启动服务器。例如（未经测试）：

async def main():
    # create the application, as before
    app = aiohttp.web.Application()
    app.add_routes([
        aiohttp.web.get('/', handle),
        aiohttp.web.get('/{name}', handle)
    ])

    # add some tasks into the current event loop
    asyncio.create_task(Task1())
    asyncio.create_task(Task2())

    # set up the web server
    runner = aiohttp.web.AppRunner(app)
    await runner.setup()
    await aiohttp.web.TCPSite(runner).start()

    # wait forever, running both the web server and the tasks
    await asyncio.Event().wait()

asyncio.run(main())

Answer 2

我只需要做一点修改就可以正常工作了...

import asyncio
from aiohttp import web


async def Task1():
    for i in range(100):
        print ('Task-1',i)
        await asyncio.sleep(1)


async def Task2():
    for i in range(100):
        print ('Task-2',i)
        await asyncio.sleep(2)



async def handle(request):
    name = request.match_info.get('name', "Anonymous")
    text = "Hello, " + name
    return web.Response(text=text)

async def HttspServer():
    # create the application, as before
    app = web.Application()
    app.add_routes([
        web.get('/', handle),
        web.get('/{name}', handle)
    ])

    # set up the web server
    runner = web.AppRunner(app)
    await runner.setup()
    site = web.TCPSite(runner)
    await site.start()

    # wait forever, running both the web server and the tasks
    await asyncio.Event().wait()


loop=asyncio.new_event_loop()
loop.create_task(Task1())
loop.create_task(Task2())
loop.create_task(HttspServer())
loop.run_forever()

Answer 3

所以这应该是最终解决方案？

#!/usr/bin/python
# -*- coding: utf8 -*-
import asyncio
from aiohttp import web


async def Task1():
    for i in range(100):
        print ('Task-1',i)
        await asyncio.sleep(1)

async def Task2():
    for i in range(100):
        print ('Task-2',i)
        await asyncio.sleep(2)

async def handle(request):
    data = {'some': 'data'}
    return web.json_response(data)

async def main():
    # create the application, as before
    app = web.Application()
    app.add_routes([
        web.get('/', handle),
        web.get('/{name}', handle)
    ])

    # add some tasks into the current event loop
    loop = asyncio.get_event_loop()
    loop.create_task(Task1())
    loop.create_task(Task2())

    # set up the web server
    runner = web.AppRunner(app)
    await runner.setup()
    await web.TCPSite(runner).start()

    # wait forever, running both the web server and the tasks
    await asyncio.Event().wait()

asyncio.get_event_loop().run_until_complete(main())

Python 非阻塞服务器

Python nonblocking server

python-3.x

python-asyncio

aiohttp