Super simple flask thing

calc_server.py

import os
from flask import *

app = Flask(__name__)


@app.route("/calculate/<a>/<b>")
def calculate(a, b):
	result = int(a) ** int(b)
	return str(result)


if __name__ == '__main__':
	app.run(debug=True, host="0", port="9999")

Instructions.md

Developing/debugging a Flask app

• Set up a virtualenv
• pip install flask
• add calc_server.py
• debug/run with python calc_server.py (autoreloading, debugging, etc.)
• Access e.g. http://localhost:9999/calculate/9652/343

Running in production in an EC2 box

• Set up a virtualenv
• pip install flask gunicorn
• Run in production mode with gunicorn --bind=0:9999 calc_server:app
• Ensure port 9999 (or whatever you choose) is open to the world in the EC2 security group
• Access e.g. http://ec2-instance-ip-here:9999/calculate/9652/343

Keeping the app up and running at all times

• Set up a systemd unit file for Gunicorn