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middlewares.py

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+# 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
+import random
+# useful for handling different item types with a single interface
+
+from spider.spiders.Redis_Con import Redis_Con
+
+
+
+class SpiderSpiderMiddleware:
+    # 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.
+    cookie=''
+    @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 SpiderDownloaderMiddleware:
+    # 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.
+    #f = Redis_Con()
+   # cookie = f.getcookie()
+
+    @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
+        self.f=Redis_Con()
+        print('开始 随机UA and 动态cookie')
+        ua = random.choice(spider.settings.get('USER_AGENTS_LIST'))
+        request.headers['User-Agent'] = ua
+        request.headers['Referer'] = 'https://accounts.douban.com'
+        request.headers['Host'] = 'movie.douban.com'
+        self.cookie = self.f.getcookie()
+        print("###借出cookie###\n"+self.cookie)
+        now_c={}
+        now_c['dbcl2']=self.cookie
+        request.cookies = now_c
+        #代理ip 由于使用免费代理延迟比较高,可能导致爬虫降速
+        '''
+        ip = self.f.getip()
+        print('当前获取的代理ip'+str(ip))
+        if ip != None:
+            request.meta['proxy'] = ip
+'''
+
+        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
+        print('###归还cookie###')
+        print(self.cookie)
+        self.f.reuturncookie(self.cookie)
+
+
+        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
+        # 如果遇到网络异常,也要归还cookie不然cookie丢失
+        print('###出错!!!归还cookie###')
+        print(self.cookie)
+        self.f.reuturncookie(self.cookie)
+        return None
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)
+
+
+class IPDownloaderMiddleware:
+    # 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.
+    #f = Redis_Con()
+   # cookie = f.getcookie()
+
+    @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
+        self.f=Redis_Con()
+        print('获取免费代理IP中')
+        ua = random.choice(spider.settings.get('USER_AGENTS_LIST'))
+        request.headers['User-Agent'] = ua
+        request.headers['Referer'] = 'www.baidu.com'
+        request.headers['Host'] = 'www.kuaidaili.com'
+
+        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
+        return None
+
+    def spider_opened(self, spider):
+        spider.logger.info('Spider opened: %s' % spider.name)