问题描述：

此aiohttp服务器在线程中的示例失败，并出现 RuntimeError：线程'Thread-1'中没有当前事件循环。错误：

This example of aiohttp server in a thread fails with an RuntimeError: There is no current event loop in thread 'Thread-1'. error:

import threading
from aiohttp import web


def aiohttp_server():
    def say_hello(request):
        return web.Response(text='Hello, world')

    app = web.Application(debug=True)
    app.add_routes([web.get('/', say_hello)])
    web.run_app(app)


t = threading.Thread(target=aiohttp_server)
t.start()

如何在线程中运行aiohttp服务器？

How to run a aiohttp server in thread?

答

在主线程中创建处理程序，并在子线程中手动创建事件循环。

Create handler in main thread and manually create an event loop in child thread.

import asyncio
import threading
from aiohttp import web


def aiohttp_server():
    def say_hello(request):
        return web.Response(text='Hello, world')

    app = web.Application(debug=True)
    app.add_routes([web.get('/', say_hello)])
    handler = app.make_handler()
    return handler


def run_server(handler):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    server = loop.create_server(handler, host='127.0.0.1', port=8089)
    loop.run_until_complete(server)
    loop.run_forever()


t = threading.Thread(target=run_server, args=(aiohttp_server(),))
t.start()

更新

对于新的 aiohttp ，请使用以下内容，谢谢@Auyer的通知。

Update

For new aiohttp, use the following, thank @Auyer for notification.

import asyncio
import threading
from aiohttp import web


def aiohttp_server():
    def say_hello(request):
        return web.Response(text='Hello, world')

    app = web.Application()
    app.add_routes([web.get('/', say_hello)])
    runner = web.AppRunner(app)
    return runner


def run_server(runner):
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    loop.run_until_complete(runner.setup())
    site = web.TCPSite(runner, 'localhost', 8080)
    loop.run_until_complete(site.start())
    loop.run_forever()


t = threading.Thread(target=run_server, args=(aiohttp_server(),))
t.start()

如何在线程中运行aiohttp服务器？

更新

Update

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