use ThreadPoolExecutor and copy_current_request_context in flask will appear some bug

[LionSniper]

in app.py file:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello_world():
    from test2 import start
    start()
    return "<p>Hello, World!</p>"

if __name__ == "__main__":
    app.run(debug=True)

in test2 file:

from flask import copy_current_request_context
import time
from concurrent.futures import ThreadPoolExecutor
import threading

@copy_current_request_context
def function_a(number):
    print(threading.current_thread().ident)
    time.sleep(1)
    return number

def start():
    with ThreadPoolExecutor(max_workers=5) as executor:
        response = list(executor.map(function_a, [1, 2]))
    return response

when i request this api , it will appear "AssertionError: Popped wrong app context. (<flask.ctx.AppContext object at 0x00000167CB79A3C8> instead of <flask.ctx.AppContext object at 0x00000167CB79A668>) // Werkzeug Debugger", how to resolve it? thanks!

[davidism]

Fairly sure this is because ThreadPoolExecutor on its own doesn't handle contextvars. There's probably something in asgiref that handles this, but I'm not familiar with it enough to point you more than that. Maybe @pgjones knows?