EchoEcho

EchoEcho is a rubygem for accessing the Echo Nest API.

Installation

Add this line to your application's Gemfile:

gem 'echo_echo', git: '[email protected]:mattmoskwa/echoecho'

And then execute:

$ bundle

Usage

This is a rubygem wrapper for the Echo Nest API. See here.

To make requests to the API, you'll need to set up a develop account and get developer keys. Once you have these, set them up by including an echonest.rb configuration file, like so:

EchoEcho.configuration do |config|
  config.api_key = "your-api-key"
  config.consumer_key = "your-consumer-key"
  config.shared_secret = "your-shared-secret"
end

In Ruby on Rails, this file generally goes in your config/initializers directory.

To run the test suite against the Echo Nest API, you can also use the included config/echonest.yml.sample file. See that file for details.

To use, simply require the gem, and follow the convention that classes are top-level namespaces, like Artist, and Genre, and methods are class methods on those classes. For example, to get Artist biographies:

biographies = EchoEcho::Artist.biographies(name: "weezer").biographies

Results are returned in JSON format, which are parsed in to ruby hashes and wrapped in Hashie::Mash objects, which define accessors for all the hash keys.

raw_value = { "biographies": [{"text"=>"FOLLOW US MORE VIDEOS", "site"=>"myspace", "url"=>"http://www.myspace.com/weezer#biography", "license"=>{"type"=>"unknown", "attribution"=>"n/a", "attribution-url"=>"http://www.myspace.com/weezer#biography", "url"=>"n/a", "version"=>"n/a"}, "truncated"=>true}]}
mash = Hashie::Mash.new(raw_values)
mash.biographies.first.text #=> "FOLLOW US MORE VIDEOS"

DSL

EchoEcho is written using a custom DSL that decribes RESTful requests with the terms "entities" (like Artist), and "methods" (like biographies). For example, to describe the url "/artist/biographies", and therefore the method Artist.biographies, use the following syntax:

entity 'artist' do
  add_method 'biographies' do
    required any: [:id, :name]
    optional :results, :start
    multiple :license
  end
end

Note the required, optional, and multiple lines. Per the docs, methods have required and optional parameters. Some required parameters are "one of x or y". To describe this limitation, use the any: [:x, :y] construction.

Some parameters can take multiple values. To describe this situtation, use the multiple :x construction. If there is a limit to the number of values a parameter can take, use the limit option, as in

entity 'artist' do
  add_method 'similar' do
    # ...
    multiple :bucket, :name, seed_catalog: {limit: 5}, id: {limit: 5}
  end
end

If a parameter can be used with any method, designate it using global.

global :format
entity 'artist' do
  # ...
end

Contributing

1. Fork it ( http://github.com//echo_echo/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

Todo

• Finish other entities

• Instancing, i.e

artist = Artist.search(name: "weezer").first
artist.class #=> EchoEcho::Artist
artist.id #=> "AR633SY1187B9AC3B9"
artist.biographies #=> etc

• Callbacks

• Error handling

• Rate-limiting

• Format (currently only JSON works)

• IDs/id spaces

• Break entities up into own files, i.e. artist.rb, genre.rb

• Add :only option to multiple method (i.e. for bucket)

multiple bucket: {only: [:audio_summary, :artist_discovery, ...]}