Rails::Rack::Logger < ActiveSupport::LogSubscriber

# File railties/lib/rails/rack/logger.rb, line 15
      def initialize(app, taggers = nil)
        @app          = app
        @taggers      = taggers || []
      end

# File railties/lib/rails/rack/logger.rb, line 20
      def call(env)
        request = ActionDispatch::Request.new(env)

        if logger.respond_to?(:tagged)
          logger.tagged(*compute_tags(request)) { call_app(request, env) }
        else
          call_app(request, env)
        end
      end

# File railties/lib/rails/rack/logger.rb, line 31
        def call_app(request, env) # :doc:
          instrumenter = ActiveSupport::Notifications.instrumenter
          handle = instrumenter.build_handle("request.action_dispatch", { request: request })
          handle.start

          logger.info { started_request_message(request) }
          status, headers, body = response = @app.call(env)
          body = ::Rack::BodyProxy.new(body, &handle.method(:finish))

          if response.frozen?
            [status, headers, body]
          else
            response[2] = body
            response
          end
        rescue Exception
          handle.finish
          raise
        ensure
          ActiveSupport::LogSubscriber.flush_all!
        end

# File railties/lib/rails/rack/logger.rb, line 62
        def compute_tags(request) # :doc:
          @taggers.collect do |tag|
            case tag
            when Proc
              tag.call(request)
            when Symbol
              request.send(tag)
            else
              tag
            end
          end
        end

# File railties/lib/rails/rack/logger.rb, line 54
        def started_request_message(request) # :doc:
          sprintf('Started %s "%s" for %s at %s',
            request.raw_request_method,
            request.filtered_path,
            request.remote_ip,
            Time.now)
        end