Flask - Subprocess - Termination : Kill process and all its child processes after a Popen

run.py

# -*- encoding: utf-8 -*-

import os
import sys

from psutil import Process
from subprocess import Popen
from flask import Flask, jsonify, current_app

app = Flask(__name__)


@app.route('/api/operation/start', methods=['POST'])
def operation_start():
    # sys.executable => Use the current environment
    p = Popen([sys.executable, '-u', './foo.py'])
    current_app.config['JOB_FOO_PID'] = p.pid
    return jsonify({'message': 'Started successfully'}), 200


@app.route('/api/operation/stop', methods=['DELETE'])
def operation_stop():
    pid = current_app.config['JOB_FOO_PID']
    if pid:
        parent = Process(pid)
        for child in parent.children(recursive=True):
            child.kill()
        parent.kill()
    return jsonify({'message': 'Stopped successfully'}), 200


# ----------------------------------------
# launch
# ----------------------------------------

if __name__ == "__main__":
    host = str(os.environ.get("HOST", '0.0.0.0'))
    port = int(os.environ.get("PORT", 5000))
    debug = bool(os.environ.get("DEBUG", True))
    app.run(host=host, port=port, debug=debug)