featured_streamers_controller.rb

# gem install kappa
class FeaturedStreamersController < ApplicationController

  TWITCH_CACHE_TIME = 5.minutes

  def index
    @streamers = load_streams 
    if params[:god_force_refresh] == "true"
      update_stream
      flash[:notice] = "Updated stream."
    end
  end

  protected
  def featured_streamers
    ["bigwhitetrain",  "skadoodle",  "ESL_CSGO", "imcoty", "callmewizz", "rpr_tv", "KYYR4", "NomadicTV"]
  end

  def load_streams
    last_updated = $redis.get("twitch:last_updated").to_i
    if Time.now - Time.at(last_updated) > TWITCH_CACHE_TIME
      json = update_stream
    else
      json = JSON.parse($redis.get("twitch:data"))
    end
    json['streamers']
  end

  def update_stream
    streamers = Twitch.streams.find(:channel => featured_streamers) # Online featured streamers
    json = { streamers: [], updated: Time.now.to_i }
    streamers.each do |stream|
      json[:streamers].push({ 
        url: stream.url,
        preview: stream.preview_url.gsub("http://", "https://"),
        display_name: stream.user.display_name,
        game: stream.game_name,
        viewer_count: stream.viewer_count
      })
    end
    $redis.set("twitch:last_updated", Time.now.to_i)
    $redis.set("twitch:data", json.to_json) 
    json.with_indifferent_access
  end

end