Sample Sinatra app to periodically submit hit data to metrics

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 'rest-client'

# these are automatically set by the Heroku add-on
# if you already have a username and token, place them here
user = ENV["LIBRATO_METRICS_USER"]
token = ENV["LIBRATO_METRICS_TOKEN"]

metrics_api = RestClient::Resource.new 'https://metrics-api.librato.com', user, token

# start our hits counter off at 0
hits_counter = 0

get '/' do
  hits_counter += 1
  
  "<p>current count: #{hits_counter}</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')
  metrics_api['/v1/metrics.json'].post :counters => {"hits" => {:value => hits_counter}}
  
  "<p>submitted: #{hits_counter}</p>" +
  "<p><a href=\"/\">go back</a></p>" +
  "<p>view uploaded data over time  at <a href=\"http://metrics.librato.com\">http://metrics.librato.com</a></p>"
end