Flask demo

Deployment

Run ./install.sh. It will:

create a virtual environment in this folder, called locutus.venv. This is where all the dependencies will be installed
install the dependencies from app/requirements.txt. Note that now this file contains linux requirements; conda interprets some system libraries as packages and will need them to be installed separately. See comments in the file for more details.
install uwsgi. Most Python web applications expect HTTP requests in a certain format, WSGI. This is similar to CGI and FastCGI that were popular in the past, but works faster. Although flask contains a built-in HTTP server, it doesn't make use of threads and isn't considered secure; it is just a development server. In production, you offload this work to WSGI servers, which pack incoming socket data to understandable in-memory WSGI data strucures. uwsgi will create a unix socket lockutus.sock in this directory when active.
create a service for uwsgi, so if/when it fails, system will restart the process automatically. Now you can start and stop the service with commands like sudo service locutus start or sudo service locutus stop.
install nginx, if necessary. Most WSGI servers aren't good at handling network socket magic, like thousands of simultaneous, often slow, clients. So, on top of uwsgi server we set up a web server, which is good at it. As a bonus, nginx will also take care of serving static files, which it does a lot more efficiently than flask itself.

After this, the website should be operational