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 qdDownloaderMiddleware(object):

# 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)