Running Fabric Commands in Flask Blocks Requests

Question

I'm currently running a Flask server that import commands from a fabfile.py and runs them using:

with settings(...):
    command()

However, when someone is running a command, fabric does not respond to other requests going to the flask server until the command has finished. How can I make sure this does not happen?

I'm using tornado to serve Flask with the following settings:

from tornado.wsgi import WSGIContainer
from tornado.httpserver import HTTPServer
from tornado.ioloop import IOLoop
from flask_ import app
import tornado.options

tornado.options.parse_command_line()

http_server = HTTPServer(WSGIContainer(app))
http_server.listen(5000)
IOLoop.instance().start()

Thanks, Matt

Answer 1

Tornado's WSGIContainer is a single-threaded WSGI server and rarely makes sense to use on its own. Unless you have a specific reason for combining a WSGI app and a Tornado app in the same process, you'll be better off using a dedicated multi-threaded WSGI server like gunicorn or uwsgi.