ludwig / fibonacci-store

Site for selling Fibonacci numbers, hot off the CPU

Goal

Serve fibonacci numbers to a user browsing a website, via a websocket notification.

Data Flow

User requests a large fibonacci number from website.

Request for computation gets put into a celery task queue.

Once task finishes, notification daemon gets a message and forwards answer to the user.

If the user is still browsing the site and has an active websocket, a non-intrusive popup should appear on the user's page.

If the user has no active connection, result gets saved to a redis database. Upon the user's next visit, user will receive all outstanding notifications.

JavaScript

The javascript libraries are installed using Bower.

It's configured using a file called bower.json. For the specific syntax, refer to https://github.com/bower/bower.json-spec

Note that in .bowerrc we specify the directory where bower should install our specified packages. In this case, we choose to put everything in the /static/bower_components subdirectory so that the flask dev server and nginx can find.

To install the specified javascript libraries

bower install

To update the libraries

bower update

Flask

To start the flask server

./fibserve.py

Redis

To start redis

make start-redis

Celery

To start celery

make start-celery-multi

BrowserNotifier

To start the browser notifier daemon,

make BrowserNotifier && ./BrowserNotifier

Calculating Fibonacci numbers with fib

To build the fib executable

make fib

Now you can calculate fibonacci numbers by passing in a single cli argument. For example,

./fib 100