forked from http://thomasvm.github.io/blog/2012/11/19/bling-dashboards-using-graphite-and-dashing/

gistfile1.rb

require 'rest-client'
require 'JSON'
require 'date'
require 'uri'

class Graphite
  def initialize(host)
    @host = host
  end

  def get_value(datapoint)
    value = datapoint[0] || 0
    return value.round(2)
  end

  def query(target, from='-2min')
    target = [
      target,
    ]
    params = {:format => 'json', :from => from, :target => target}
    url = URI::HTTP.build(:host => @host, :path => '/render', :query => URI.encode_www_form(params))
    response = RestClient.get url.to_s
    result = JSON.parse(response.body, :symbolize_names => true)

    return result
  end

  def series(name, since='-2min')
    return query(name, since).to_json
  end
end

• create url with URI
• return series of data