Python 多处理（Flask） - 从主进程调用 function

Question

这是我的代码：

from flask import Flask, render_template, url_for, redirect, request, flash, Markup, make_response, Response
from multiprocessing import Process, Value

def getCookie():
    return request.cookies.get('username')

def worker(state):
    if state.value == 1:
        while True:
            print(getCookie())

if __name__ == '__main__':
    processValues = Value('i', 1)
    p = Process(target=worker, args=(processValues, ))
    p.start()
    app.run()
    p.join()

So worker is the function started by Multiprocessing and it's trying to call function getCookie() which uses a function by Flask .

这似乎给我一个错误说

RuntimeError: Working outside of request context.

This typically means that you attempted to use functionality that needed
an active HTTP request.  Consult the documentation on testing for
information about how to avoid this problem.

无论如何我可以解决这个问题？

更新

另外，我尝试像这样在 args 中发送请求 function

from flask import Flask, render_template, url_for, redirect, request, flash, Markup, make_response, Response
from multiprocessing import Process, Value

def worker(state, req):
    if state.value == 1:
        while True:
            print(req.cookies.get('username'))

if __name__ == '__main__':
    processValues = Value('i', 1)
    p = Process(target=worker, args=(processValues, request ))
    p.start()
    app.run()
    p.join()

这只会给我带来另一个错误。

Answer 1

如果您只需要读取此 cookie，则可以将其作为参数发送

p = Process(target=worker, args=(processValues, getCookie()))

或直接

p = Process(target=worker, args=(processValues, request.cookies.get('username'))

但是你必须在工人中得到它

def worker(state, username):

---

类似的方式你可以尝试发送完整的request

p = Process(target=worker, args=(processValues, request))

顺便说一句：据我所知， multiprocessing使用pickle将 arguments 作为文件发送。