python How can I run flask app in a thread?

Question

How can I run my flask app in a separate thread? I am able to run my flask app in main, but

I need to launch the flask app from a thread, that thread should be running while in main thread I initiate an event for the thread engine to start.

so this works fine

@app.route("/voice", methods=['GET', 'POST']) def voice(): ......... return str(resp) @app.route("/mainFlow", methods=['GET', 'POST']) def mainFlow(): """Respond """ ....... return str(resp) if __name__ == "__main__": app.run(debug=True)

but I need something like this

def myIVR(): print("-----------------Thrd1-myIVR --------------------") app = Flask(__name__) app.run(debug=True) @app.route("/voice", methods=['GET', 'POST']) def voice(): ........ return str(resp) @app.route("/mainFlow", methods=['GET', 'POST']) def mainFlow(): """Respond to """ resp = VoiceResponse() def myTest(): print("E2Etest") thrd1 = threading.Thread(target=myIVR, args=[]) thrd1.start() print("trigger event") #xyz() ################################################################ def main(): myTest() if __name__ == '__main__': main()

I get this error

 File "C:\......\AppData\Local\Programs\Python\Python37-32\lib\signal.py", line 47, in signal handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler)) ValueError: signal only works in main thread

did you check this linki stackoverflow.com/questions/53522052/… — Ghassen
– Ghassen, Commented Jul 2, 2019 at 15:57
Thank you, it looks like it has been asked about debug, I am wondering about threading. I also do know that I can run Flask in main thread, and I am NOT Using debugging. I need to run in threading mode. — Ghost
– Ghost, Commented Jul 2, 2019 at 16:33
I have a working example you can crib from. github.com/davewsmith/lapse/blob/master/lapse.py#L31 is where I launch the thread to run Flask. Note in particular the use_reloader=False part, which avoids much sadness. — Dave W. Smith
– Dave W. Smith, Commented Jul 2, 2019 at 22:16

Ghassen · Accepted Answer · 2019-07-02 22:13:32Z

try this :

from flask import Flask import threading app = Flask(__name__) def myIVR(): print("-----------------Thrd1-myIVR --------------------") app = Flask(__name__) threading.Thread(target=app.run).start() @app.route("/voice", methods=['GET', 'POST']) def voice(): return str(resp) @app.route("/mainFlow", methods=['GET', 'POST']) def mainFlow(): """Respond to """ resp = VoiceResponse() def myTest(): print("E2Etest") thrd1 = threading.Thread(target=myIVR, args=[]) thrd1.start() print("trigger event") #xyz() ################################################################ def main(): myTest() if __name__ == '__main__': main()

or use the flask with debuging mode False it will fix your problem :

from flask import Flask import threading app = Flask(__name__) def myIVR(): print("-----------------Thrd1-myIVR --------------------") app = Flask(__name__) app.run(debug=False) @app.route("/voice", methods=['GET', 'POST']) def voice(): return str(resp) @app.route("/mainFlow", methods=['GET', 'POST']) def mainFlow(): """Respond to """ resp = VoiceResponse() def myTest(): print("E2Etest") thrd1 = threading.Thread(target=myIVR, args=[]) thrd1.start() print("trigger event") #xyz() ################################################################ def main(): myTest() if __name__ == '__main__': main()

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