| # 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 DanbooruCrawlerSpiderMiddleware: | |
| # 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. | |
| 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 DanbooruCrawlerDownloaderMiddleware: | |
| # 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. | |
| 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) | |