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https://github.com/schmich/kappa

The Twitch Ruby API
https://github.com/schmich/kappa

api kappa kraken rest ruby twitch twitch-tv

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The Twitch Ruby API

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# ![Kappa](https://raw.github.com/schmich/kappa/master/assets/kappa.png) Kappa



Kappa is the Ruby library for interfacing with the [Twitch.tv API](https://github.com/justintv/Twitch-API).



[![Gem Version](https://badge.fury.io/rb/kappa.svg)](http://rubygems.org/gems/kappa)

[![Build Status](https://secure.travis-ci.org/schmich/kappa.svg)](http://travis-ci.org/schmich/kappa)

[![Dependency Status](https://gemnasium.com/schmich/kappa.svg)](https://gemnasium.com/schmich/kappa)

[![Coverage Status](http://img.shields.io/coveralls/schmich/kappa.svg)](https://coveralls.io/r/schmich/kappa?branch=master)

[![Code Climate](http://img.shields.io/codeclimate/github/schmich/kappa.svg)](https://codeclimate.com/github/schmich/kappa)



## Getting Started



```bash

gem install kappa

```



```ruby

require 'kappa'



frag = Twitch.channels.get('lethalfrag')

puts frag.streaming?

```



```ruby

gem 'kappa', '~> 1.0'

```



## Configuration



When making requests to Twitch, you must specify a client ID for your application.

If you do not specify a client ID, Twitch reserves the right to rate-limit your application

without warning.



Your client ID can be specified through configuration, for example:



```ruby

Twitch.configure do |config|

  config.client_id = 'sc2daily-v1.0.0'

end

```



See the [`Twitch.configure`](http://rdoc.info/gems/kappa/Twitch#configure-class_method) documentation.



## Examples



Get the featured streams on the Twitch.tv homepage:



```ruby

Twitch.streams.featured do |stream|

  channel = stream.channel

  puts "#{channel.display_name}: #{stream.viewer_count} viewers"

  puts "#{channel.status}"

  puts '-' * 80

end

```



See if certain users are streaming:



```ruby

users = ['destiny', 'followgrubby', 'incontroltv']

Twitch.streams.find(:channel => users) do |stream|

  puts "#{stream.channel.name} is streaming #{stream.game_name}."

end

```



Get the most popular games being streamed:



```ruby

Twitch.games.top(:limit => 3) do |game|

  print "#{game.name}: "

  print "#{game.viewer_count} viewers in "

  puts  "#{game.channel_count} channels"

end

```



Get streams for a particular game:



```ruby

Twitch.streams.find(:game => 'League of Legends') do |stream|

  next if stream.viewer_count < 1000

  puts "#{stream.channel.display_name}: #{stream.viewer_count}"

end

```



Get info for a single user:



```ruby

user = Twitch.users.get('lethalfrag')

stream = user.stream



puts user.display_name

if stream

  puts "Streaming #{stream.game_name} at #{stream.url}"

else

  puts 'Not streaming.'

end

```



Get the followers of a channel:



```ruby

channel = Twitch.channels.get('day9tv')

channel.followers do |user|

  puts user.display_name

end

```



## Resources



### Channels



Channels serve as the home location for a [user's](#users) content. Channels have a [stream](#streams),

can run commercials, store [videos](#videos), display information and status, and have a customized page

including banners and backgrounds. See the [`Channel`](http://rdoc.info/gems/kappa/Twitch/V2/Channel) documentation.



```ruby

c = Twitch.channels.get('destiny')

c.nil?        # => false (channel exists)

c.stream      # => # (current live stream)

c.url         # => "http://www.twitch.tv/destiny"

c.status      # => "Destiny - Diamond I ADC  - Number 1 Draven player..."

c.teams       # => [#]      

c.videos      # => [#, ...]

c.followers   # => [#, ...]

```



### Streams



Streams are video broadcasts that are currently live. They belong to a [user](#users) and are part of a

[channel](#channels). See the [`Stream`](http://rdoc.info/gems/kappa/Twitch/V2/Stream) and

[`Streams`](http://rdoc.info/gems/kappa/Twitch/V2/Streams) documentation.



```ruby

s = Twitch.streams.get('idrajit')

s.nil?          # => false (currently live)

s.game_name     # => "StarCraft II: Heart of the Swarm"

s.viewer_count  # => 7267

s.channel.url   # => "http://www.twitch.tv/idrajit"

```



### Users



These are members of the Twitch community who have a Twitch account. If broadcasting, they can own a

[stream](#streams) that they can broadcast on their [channel](#channels). If mainly viewing, they might

follow or subscribe to channels. See the [`User`](http://rdoc.info/gems/kappa/Twitch/V2/User) documentation.



```ruby

u = Twitch.users.get('snoopeh')

u.nil?                    # => false (user exists)

u.channel                 # => #

u.following.map(&:name)   # => ["national_esl1", "dreamhacklol", "riotgames"]

```



### Videos



Videos are broadcasts or highlights owned by a [channel](#channels). Broadcasts are unedited videos that are saved

after a streaming session. Highlights are videos edited from broadcasts by the channel's owner. See the

[`Video`](http://rdoc.info/gems/kappa/Twitch/V2/Video) and [`Videos`](http://rdoc.info/gems/kappa/Twitch/V2/Videos)

documentation.



```ruby

v = Twitch.videos.get('a395995729')

v.nil?          # => false (video exists)

v.title         # => "DreamHack Open Stockholm 26-27 April"

v.game_name     # => "StarCraft II: Heart of the Swarm"

v.recorded_at   # => 2013-04-26 18:33:48 UTC

v.view_count    # => 12506

```



### Teams



Teams are an organization of [channels](#channels). See the [`Team`](http://rdoc.info/gems/kappa/Twitch/V2/Team)

documentation.



```ruby

t = Twitch.teams.get('teamliquid')

t.nil?          # => false (team exists)

t.display_name  # => "TeamLiquid"

t.info          # => "TeamLiquid is awesome. and esports. video games. \n\n"

t.updated_at    # => 2013-05-24 00:17:10 UTC

```



### Games



Games are categories (e.g. League of Legends, Diablo 3) used by [streams](#streams) and [channels](#channels).

Games can be searched for by query. See the [`Game`](http://rdoc.info/gems/kappa/Twitch/V2/Game),

[`Games`](http://rdoc.info/gems/kappa/Twitch/V2/Games), and

[`GameSuggestion`](http://rdoc.info/gems/kappa/Twitch/V2/GameSuggestion) documentation.



```ruby

top = Twitch.games.top(:limit => 2)

top.map(&:name)  # => ["League of Legends", "StarCraft II: Heart of the Swarm"]

```



```ruby

g = Twitch.games.top(:limit => 1).first

g.name                   # => "League of Legends"

g.channel_count          # => 906

g.viewer_count           # => 79223

g.box_images.medium_url  # =>"http://static-cdn.jtvnw.net/ttv-boxart/31412.jpg"

```



```ruby

s = Twitch.games.find(:name => 'diablo', :live => true)

s.map(&:name)        # => ["Diablo III", "Diablo II", "Diablo"]

s.map(&:popularity)  # => [120, 4, 1]

```



## Errors



All errors derive from `Twitch::Error`.



- `Twitch:Error` - Base class for all errors.

- `Twitch::Error::ResponseError` - Base class for all Twitch.tv API response errors.

- `Twitch::Error::FormatError` - The returned data was incorrectly formatted (e.g. invalid JSON).

- `Twitch::Error::ClientError` - The server returned a 4xx status code.

- `Twitch::Error::ServerError` - The server returned a 5xx status code.



All `ResponseError` errors have additional diagnostic information:



```ruby

e.status # => 422

e.body   # => '{"status":422,"message":"...","error":"..."}'

e.url    # => "https://api.twitch.tv/streams/desrow"

```



See the [`ResponseError`](http://rdoc.info/gems/kappa/Twitch/Error/ResponseError) documentation.



## Documentation



- Current release: [http://rdoc.info/gems/kappa/frames](http://rdoc.info/gems/kappa/frames)

- Latest master: [http://rdoc.info/github/schmich/kappa/frames](http://rdoc.info/github/schmich/kappa/frames)

- Twitch REST API: [https://github.com/justintv/Twitch-API](https://github.com/justintv/Twitch-API)



## Versioning



### Library version



Kappa adheres to the [Semantic Versioning 2.0.0](http://semver.org/) specification. Most importantly, any

compatibility- or API-breaking changes will result in a new major version (e.g. `1.x.x` to `2.x.x`). Because

of this, you should use a [pessimistic version constraint](http://docs.rubygems.org/read/chapter/16#page74) when

taking a dependency on this library. For example:



```ruby

gem 'kappa', '~> 1.0'

```



Any new backwards-compatible features will result in a new minor version (e.g. `x.1.x` to `x.2.x`) while any

backwards-compatible bugfixes will result in a new patch version (e.g. `x.x.1` to `x.x.2`).



### Twitch API versions



Twitch supports multiple versions of their API simultaneously, with each version potentially providing different data

and behaving differently. Because of this, you can specify which version of the Twitch API you wish to use.

This is done through Kappa configuration.



For example, if you want to use the V2 Twitch API:



```ruby

Twitch.configure do |config|

  config.client_id = 'sc2daily-v1.0.0'

  config.api = Twitch::V2

end

```



`Twitch::V2` is the default and is currently the only supported API version.



## Contributing



- [Fork and clone the repo.](http://help.github.com/fork-a-repo/)

- [Create a branch for your changes.](http://git-scm.com/book/en/Git-Branching-Basic-Branching-and-Merging)

- Run `bundle install` to install development requirements.

- Implement your feature or bug fix.

- Add specs under the `spec` folder to prevent regressions or to test new code.

- Add [YARD](http://rubydoc.info/docs/yard/file/docs/GettingStarted.md) documentation for new features. Run `rake yard` to view documentation.

- Run `rake coverage` to run specs with code coverage. All specs must pass; coverage must remain at 100%. Run `rake coverage:view` to see a detailed report.

- Commit and push your changes.

- [Submit a pull request.](http://help.github.com/send-pull-requests/)



## License



Copyright © 2013 Chris Schmich  

MIT License. See [LICENSE](LICENSE) for details.