Deploy to staging server based on Payload JSON from SemaphoreApp

app.rb

post '/deploy' do
  json = request.body.read
  data = Yajl::Parser.parse(json)
  token = ENV['CAMPFIRE_TOKEN']
  account = ENV['CAMPFIRE_ACCOUNT']

  campfire = Tinder::Campfire.new account, :token => token, :ssl_verify => false
  room = campfire.find_room_by_name("Rental Dev")
  commit = data['commit']

  if data['branch_name'] == 'master' && data['result'] == 'passed'
    deploy_notification <<-END_OF_MESSAGE
      Deploying #{commit['id']} to staging
      #{commit['message']}"
    END_OF_MESSAGE

    room.paste deploy_notification

    workspace = 'rentwb_for_deployment'
    commands = ['git pull origin master', 'bundle install', 'bundle exec cap staging deploy:migrations']
    begin
      commands.each do |command|
        command = "cd #{workspace} && #{command}"
        room.speak "Executing: #{command}"
        io = IO.popen(command)
        io.each do |line|
          write_log(line, :master)
        end
      end
    rescue => e
      write_log(e.inspect, :master)
      write_log("", :master)
    end
  end
end

def write_log(string, filename)
  file = File.new("log/deploy_#{filename.to_s}.log", "a")
  file << string.to_s
  file.close
end