Track matching

lib/track.js subscribes to MQTT bbc/livetext topics and tries to match items that look like songs. At the moment this is a naive, case-insenstive regexp /Now Playing: (.*) by (.*)/. Found songs are republished on the bbc/livetracks topic, under the same service id and also under track and artist.

So, a the following bit of livetext:

bbc/livetext/1xtra    Now Playing: P's & Q's by Kano

Will result in 3 items being published:

bbc/livetracks/1xtra        P's & Q's by Kano
bbc/livetracks/1xtra/track  P's & Q's
bbc/livetracks/1xtra/artist Kano

The livetext topic may publish the same 'now playing' text many times, but only 1 livetrack message for the track will be published.

Artwork resolution

lib/artwork.js subscribes to MQTT bbc/livetracks topics and tries to find artwork for the songs. At the moment this is via the (Discogs)[http://www.discogs.com/] API.

Any artwork URLs found will be published under the bbc/livetracks/SERVICE/artwork topic e.g.

bbc/livetracks/1xtra 21 Seconds by So Solid Crew

Will result in the following items being published:

bbc/livetracks/1xtra/artwork http://api.discogs.com/image/R-115228-1327259213.jpeg
bbc/livetracks/1xtra/artwork http://api.discogs.com/image/R-115228-1327259220.jpeg
bbc/livetracks/1xtra/artwork http://api.discogs.com/image/R-115228-1327259226.jpeg

Installing

The code is written in javascript and runs in nodejs. For ease of running under Heroku a Procfile is included so you'll need foreman to run it. The Gemfile and package.json will have everything you need.

$ bundle install 
$ npm install
$ foreman start

To just run either the tracks or artworks process only, set the ONLY environment variable when you call foreman:

$ ONLY=artworks foreman start

Deploying to Heroku

Since this project has a Gemfile and package.json, Heroku wrongly assumes it's a Ruby project. To get around this, create the app with the nodejs buildpack:

$ heroku create -s cedar --buildpack https://github.com/heroku/heroku-buildpack-nodejs

Or, if you've already created the app, add this config var:

$ heroku config:add BUILDPACK_URL=https://github.com/heroku/heroku-buildpack-nodejs