Method: TemplateStreaming::Controller#render_with_template_streaming

Defined in:
lib/template_streaming.rb

#render_with_template_streaming(*args, &block) ⇒ Object 



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# File 'lib/template_streaming.rb', line 40

def render_with_template_streaming(*args, &block)
  options = args.first { |a| a.is_a?(Hash) }
  if options && options.size == 1 && options.key?(:stream)
    # Need to set the default values, since the standard #render won't.
    options[:template] = default_template
    options[:layout] = true
  end
  push_render_stack_frame do |stack_height|
    if start_streaming_template?(stack_height, *args)
      @streaming_template = true
      @template.streaming_template = true
      @performed_render = true
      @streaming_body = StreamingBody.new(template_streaming_threshold) do
        cookies.freeze
        if self.class.session_store.sent_with_headers?
          session.freeze
          flash.freeze
        end

        @performed_render = false
        last_piece = render_without_template_streaming(*args, &block)
        # The original render will clobber our response.body, so
        # we must push the buffer ourselves.
        push last_piece
      end
      response.body = @streaming_body
      response.prepare!
      form_authenticity_token  # generate now

      # Normally, the flash is swept on first reference. This
      # means we need to ensure it's referenced before the session
      # is persisted. In the case of the cookie store, that's when
      # the headers are sent, so we force a reference now.
      #
      # But alas, that's not all. @_flash is removed after
      # #perform_action, which means calling #flash in the view
      # would cause the flash to be referenced again, sweeping the
      # flash a second time. To prevent this, we preserve the
      # flash in a separate ivar, and patch #flash to return this
      # if we're streaming.
      #
      flash  # ensure sweep
      @template_streaming_flash = @_flash
      request.env[STREAMING_KEY] = true

      run_callbacks :when_streaming_template
    else
      render_without_template_streaming(*args, &block)
    end
  end
end