Server-side Google Analytics tracking in rails

application_controller.rb

class ApplicationController
  around_filter :track_with_google_analytics
  private def track_with_google_analytics
    start = Time.now
    yield

    # Track API hits server-side using Google's Measurement Protocol
    # https://developers.google.com/analytics/devguides/collection/protocol/v1/
    if ENV['GA_TRACKING_CODE'].present?
      finish = Time.now
      dl = request.base_url + request.path_info
      safe_params = request.query_parameters.except('access_token')
      if safe_params.any?
        dl += '?' + safe_params.to_query
      end
      uid = current_resource_owner.try(:id)
      aid = current_application.try(:id)
      an = current_application.try(:name)
      # not needed since we send UID
      cid = uid # or by app/user combo? [aid, uid].join('.')
      cg1 = "#{controller_path}/#{action_name}"
      srt = ((finish-start)*1000).to_i
      ul = if request.env['HTTP_ACCEPT_LANGUAGE']
        request.env['HTTP_ACCEPT_LANGUAGE'].split(',').try(:first)
      end

      data = {
        v: 1,
        tid: ENV['GA_TRACKING_CODE'],
        t: 'pageview',
        dl: dl,
        uid: uid,
        aid: aid,
        an: an,
        cid: cid,
        uip: request.remote_ip,
        aip: 1,
        ua: request.user_agent,
        ul: ul,
        cg1: cg1,
        plt: srt,
        srt: srt, #ignored by google
        dt: cg1,
        cm: 'api',
        cs: an,
        ci: "oauth_app.#{aid}"
      }
      url = URI('https://www.google-analytics.com/collect?'+data.to_query)
      # dont wait around for this
      Thread.start do
        begin
          res = Net::HTTP.get_response(url)
          logger.info "#{url} => #{res.inspect}"
        rescue StandardError => err
          logger.error "#{url} #{err}"
        end
      end
    end
  end
end