profile for api running in subthread

[zono]

Hi. Can I use flask-profiler for api running in subthread? I tried it like the following. However I got ValueError: signal only works in main thread error. Can you please help me to solve it?

• files

├── server.py
└── api.py

• server.py

import time
import api

api_server = api.APIServer()
api_server.daemon = True
api_server.start()

while True:
  time.sleep(1)

• api.py

import threading
from flask import Flask
import flask_profiler

class APIServer(threading.Thread):

  def __init__(self):
    threading.Thread.__init__(self)

  def run(self):
    app = Flask(__name__)
    app.config["DEBUG"] = True

    app.config["flask_profiler"] = {
      "enabled": app.config["DEBUG"],
      "storage": {
        "engine": "sqlite"
      },
      "basicAuth":{
        "enabled": True,
        "username": "admin",
        "password": "admin"
      },
        "ignore": [
          "^/static/.*"
        ]
      }

    @app.route('/products', methods=['GET'])
    def listProducts():
      return "suppose I send you product list..."

    flask_profiler.init_app(app)

    app.run(host="127.0.0.1", port=5000, threaded=True)

• command

$ python3 server.py
 * Serving Flask app "api" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/home/xxx/flask-profiler/api.py", line 35, in run
    app.run(host="127.0.0.1", port=5000, threaded=True)
  File "/home/xxx/.local/lib/python3.5/site-packages/flask/app.py", line 943, in run
    run_simple(host, port, self, **options)
  File "/home/xxx/.local/lib/python3.5/site-packages/werkzeug/serving.py", line 812, in run_simple
    reloader_type)
  File "/home/xxx/.local/lib/python3.5/site-packages/werkzeug/_reloader.py", line 267, in run_with_reloader
    signal.signal(signal.SIGTERM, lambda *args: sys.exit(0))
  File "/usr/lib/python3.5/signal.py", line 47, in signal
    handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread