config.ru

# frozen_string_literal: true

# This file is used by Rack-based servers to start the application.

require_relative "config/environment"

prometheus_enabled = ENV.fetch("PROMETHEUS_ENABLED", "false")

if prometheus_enabled == "true"
  require "prometheus/middleware/collector"

  rackapp = Rack::Builder.app do
    use Prometheus::Middleware::Collector
    if ENV["PROMETHEUS_BASIC_AUTH_USERNAME"].present?
      map "/metrics" do
        use Rack::Auth::Basic, "Ciao Prometheus Metrics" do |username, password|
          Rack::Utils.secure_compare(ENV["PROMETHEUS_BASIC_AUTH_USERNAME"], username) &&
            Rack::Utils.secure_compare(ENV["PROMETHEUS_BASIC_AUTH_PASSWORD"], password)
        end
        use Rack::Deflater
        use Yabeda::Prometheus::Exporter, path: ""
        run ->(_) { [500, {"Content-Type" => "text/html"}, ["Ciao Prometheus Metrics unreachable."]] }
      end
    else
      use Yabeda::Prometheus::Exporter
    end
    run Rails.application
  end
  run rackapp
else
  run Rails.application
end