spiders.py 文件源码

def setup_redis(self):
        """Setup redis connection and idle signal.

        This should be called after the spider has set its crawler object.
        """
        if not self.redis_key:
            self.redis_key = '%s:start_urls' % self.name

        self.server = connection.from_settings(self.crawler.settings)
        # idle signal is called when the spider has no requests left,
        # that's when we will schedule new requests from redis queue
        self.crawler.signals.connect(self.spider_idle, signal=signals.spider_idle)
        self.crawler.signals.connect(self.item_scraped, signal=signals.item_scraped)
        self.log("Reading URLs from redis list '%s'" % self.redis_key)