text: # Define here the models for your spider middleware
  #
  # See documentation in:
  # https://docs.scrapy.org/en/latest/topics/spider-middleware.html
  
  from scrapy import signals
  
  # useful for handling different item types with a single interface
  from itemadapter import is_item, ItemAdapter
  
  
  class K8CrawlerSpiderMiddleware:
      # Not all methods need to be defined. If a method is not defined,
      # scrapy acts as if the spider middleware does not modify the
      # passed objects.
  
      @classmethod
      def from_crawler(cls, crawler):
          # This method is used by Scrapy to create your spiders.
          s = cls()
          crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
          return s
  
      def process_spider_input(self, response, spider):
          # Called for each response that goes through the spider
          # middleware and into the spider.
  
          # Should return None or raise an exception.
          return None
  
      def process_spider_output(self, response, result, spider):
          # Called with the results returned from the Spider, after
          # it has processed the response.
  
          # Must return an iterable of Request, or item objects.
          for i in result:
              yield i
  
      def process_spider_exception(self, response, exception, spider):
          # Called when a spider or process_spider_input() method
          # (from other spider middleware) raises an exception.
  
          # Should return either None or an iterable of Request or item objects.
          pass
  
      def process_start_requests(self, start_requests, spider):
          # Called with the start requests of the spider, and works
          # similarly to the process_spider_output() method, except
          # that it doesn’t have a response associated.
  
          # Must return only requests (not items).
          for r in start_requests:
              yield r
  
      def spider_opened(self, spider):
          spider.logger.info('Spider opened: %s' % spider.name)
  
  
  class K8CrawlerDownloaderMiddleware:
      # Not all methods need to be defined. If a method is not defined,
      # scrapy acts as if the downloader middleware does not modify the
      # passed objects.
  
      @classmethod
      def from_crawler(cls, crawler):
          # This method is used by Scrapy to create your spiders.
          s = cls()
          crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
          return s
  
      def process_request(self, request, spider):
          # Called for each request that goes through the downloader
          # middleware.
  
          # Must either:
          # - return None: continue processing this request
          # - or return a Response object
          # - or return a Request object
          # - or raise IgnoreRequest: process_exception() methods of
          #   installed downloader middleware will be called
          return None
  
      def process_response(self, request, response, spider):
          # Called with the response returned from the downloader.
  
          # Must either;
          # - return a Response object
          # - return a Request object
          # - or raise IgnoreRequest
          return response
  
      def process_exception(self, request, exception, spider):
          # Called when a download handler or a process_request()
          # (from other downloader middleware) raises an exception.
  
          # Must either:
          # - return None: continue processing this exception
          # - return a Response object: stops process_exception() chain
          # - return a Request object: stops process_exception() chain
          pass
  
      def spider_opened(self, spider):
          spider.logger.info('Spider opened: %s' % spider.name)
  