Using flask inside class

Question

I have application with many threads. One of them is flask, which is used to implement (axillary) API. It used with low load and never exposed to the Internet, so build-in f

Answer 1

Although this works it doesn't feel compliant with the Flask style guide. If you need to wrap a Flask application inside your project, create a separate class to your needs and add functions that should be executed

from flask import Flask, Response


class EndpointAction(object):

    def __init__(self, action):
        self.action = action
        self.response = Response(status=200, headers={})

    def __call__(self, *args):
        self.action()
        return self.response


class FlaskAppWrapper(object):
    app = None

    def __init__(self, name):
        self.app = Flask(name)

    def run(self):
        self.app.run()

    def add_endpoint(self, endpoint=None, endpoint_name=None, handler=None):
        self.app.add_url_rule(endpoint, endpoint_name, EndpointAction(handler))


def action():
    # Execute anything

a = FlaskAppWrapper('wrap')
a.add_endpoint(endpoint='/ad', endpoint_name='ad', handler=action)
a.run()

Some things to note here:

• EndpointAction is supposed to be a wrapper that will execute your function and generate an empty 200 response. If you want you can edit the functionality
• The endpoint handler can be anything that has a __call__ method defined
• The endpoint name should be unique as it represents a view name
• Adding endpoints after the application is not possible as the thread will block once the application starts. You can enable it by running the application on a separate thread but changing the URL map on the fly is not advised, neither thread safe