Dead simple way to create a dynamically extensible Flask server

server.py

import sys

from flask import Flask, request

# initialize our Flask application
app= Flask(__name__)

# the use case is to translate and forward incoming requests to other servers and return the response
# we want the server to be hot pluggable, ie add new "adapters" on the fly

# for the below code to work you need
# an adapter folder (we use the local adapters/ folder here)
# in this folder add an __init__.py file
# in the init file add the following code
# 
# #!/usr/bin/env python
# import os, pkgutil
# __all__ = list(module for _, module, _ in pkgutil.iter_modules([os.path.dirname(__file__)]))
# 
# this will automatically import all the files added in the directory


# this method allows the user to upload new scripts
# it writes directly into the local folder so you'll want to change that

@app.route("/adapter/<adapterid>/upload", methods=["POST"])
def upload(adapterid):
    posted_data = request.get_json()

    # check adapterid is valid
    try:
        check = int(adapterid)
    except:
        raise 'Adapter id is not a valid integer'

    # TODO - check script content is valid
    codeContent = posted_data['code']

    # update the adapter file
    with open('adapters/adapter_' + adapterid, 'w') as file:
        file.write(codeContent)

    return {}

# below are two examples of queries and how to retrieve the adapter and call it
# this expects the adapter to implement the common functions as defined by the service

@app.route("/adapter/<adapterid>/testpost", methods=["POST"])
def testpost(adapterid):
    posted_data = request.get_json()

    adapter = get_adapter(adapterid)

    return adapter.testpost(posted_data)


@app.route("/adapter/<adapterid>/check", methods=["GET"])
def testget(adapterid):
    adapter = get_adapter(adapterid)

    return adapter.testget()


# this shows how to retrieve the adapter
def get_adapter(adapterid):
    return sys.modules.get('adapters.adapter_' + adapterid)



#  main thread of execution to start the server
# you can remove the debug setting but make sure you have the use_reloader setting to true
if __name__=='__main__':
    app.run(debug=True, use_reloader=True)