sample EY Metrics application

app.rb

# example code to submit data to the Librato Metrics API
# this is a small sinatra web application that keeps track of how many times
# the main page has been hit. when desired, the user can submit that data to metrics

# for more info visit http://dev.librato.com/

# 1.8.x compatibility
require 'rubygems'

require 'sinatra'
require 'ey_config'
require 'rest-client'
require 'singleton'

class MetricsAPI
  include Singleton
  attr_reader :api

  def initialize
    # these are automatically set by the Librato Metrics Engine Yard Service
    # if you already have a username and token, place them here
    user = EY::Config.get('librato-metrics','LIBRATO_METRICS_USER')
    token = EY::Config.get('librato-metrics','LIBRATO_METRICS_TOKEN')
    @api = RestClient::Resource.new 'https://metrics-api.librato.com', user, token
  end
end

class Counter
  include Singleton
  attr_accessor :count

  def initialize
    @count = 0
  end
end

module Sample
  class Application < Sinatra::Base
    get '/' do
      Counter.instance.count += 1

      "<p>current count: #{Counter.instance.count}</p>" +
      "<p>reload to increase the count</p>" +
      "<p>submit to metrics <a href=\"/submit\">here</a></p>"
    end

    get '/submit' do
      # send some data to the counter
      # available metrics are 'counters' and 'gauges'
      # counters go continually up and wrap around ('total bytes sent')
      # while gauges are realtime samples ('current temperature')
      MetricsAPI.instance.api['/v1/metrics.json'].post :counters => {"hits" => {:value => Counter.instance.count}}

      "<p>submitted: #{Counter.instance.count}</p>" +
      "<p><a href=\"/\">go back</a></p>" +
      "<p>view uploaded data over time by visiting Metrics through your EY dashboard </p>"
    end
  end
end

config.ru

require 'bundler'

require File.expand_path(File.join(File.dirname(__FILE__), 'app.rb'))

map '/' do
  run Sample::Application
end

# vim: filetype=ruby

Gemfile

source "http://rubygems.org"
gem "sinatra", "1.2.6", :require => "sinatra/base"
gem "thin", "1.2.7"
gem 'ey_config'
gem 'rest-client'

# vim: filetype=ruby