experiment_exporter_controller.rb

require './lib/exporters/experiment_exporter'

module Api
  module V1
    class ExperimentExporterController < Api::ApiController
      include ActionController::Live

      def show
        authorize! :read, :experiment_exporter
        # experiment_id = params[:id]
        # exporter = Exporters::ExperimentExporter.new(experiment_id)
        # writer = StreamWriter.new(response, "experiment.csv")
        # exporter.export2(writer)
        # send_file(file,
        #           :filename => "experiment.csv",
        #           :type => "text/csv")

        response.headers['Content-Type'] = 'text/event-stream'
        10.times {
          puts "streamuje"
          response.stream.write "This is a test Messagen"
          sleep 1
        }
        response.stream.close
      end

      class StreamWriter

        def initialize(response, filename)
          @response = response
          @filename = filename
          @first_write = true
        end

        def write(data)
          if @first_write
            puts ">>>>>>>>>>>>>>>> dodaje headery #{@first_read}"
            @response.headers['Content-Type'] = 'Application/octet-stream'
            @response.headers['Content-Disposition'] = 'attachment; filename="' + @filename + '"'
            @response.headers['X-Accel-Buffering'] = 'no'
            @first_write= false
          end
          puts ">>>>>>>>>> pisze do streama"
          @response.stream.write data
        end

      end

    end
  end
end