asynchronous - 如何在 Flask/gunicorn/gevent 中启动一个异步函数？

Question

我目前有一个 Flask 应用程序

from flask import Flask
import time

app = Flask(__name__)


@app.route('/')
def foobar_view():
    long_running()  # TODO: Just trigger this; don't wait for completion
    return 'Done!'


def long_running():
    print('long_running:start')
    time.sleep(100)
    print('long_running:end')


app.run(host='localhost', port=5000)

开始于

gunicorn --worker-class=gevent \
         --worker-connections=1000 \
         --bind 0.0.0.0:5000 my_app.app:app \
         --workers=4 \
         --timeout 120 \
         --keep-alive 120

应用不会有很重的负载，这个long_running函数只会很少被触发。我正在寻找一种简单的方法来运行它，并且我愿意接受有关 gunicorn/gevent 的更改。我正在使用 Python 3.7。

如何让 long_running 异步执行？

Answer 1

解决方案可能是在线程中运行 int:

from flask import Flask
import time
from threading import Thread

app = Flask(__name__)


@app.route('/')
def foobar_view():
    Thread(target=async_long_running, args=(app, 'works')).start()
    return 'Done!'


def async_long_running(app, msg):
    with app.app_context():
        long_running(msg)

def long_running(foo):
    print('long_running:start:{}'.format(foo))
    time.sleep(100)
    print('long_running:end')


app.run(host='localhost', port=5000)