Scrapy 管道 spider_opened 和 spider_closed 未被调用 [英] Scrapy pipeline spider_opened and spider_closed not being called

问题描述

我在使用爬虫管道时遇到了一些问题.我的信息正在从网站上被抓取，并且 process_item 方法被正确调用.然而，spider_opened 和 spider_closed 方法没有被调用.

I am having some trouble with a scrapy pipeline. My information is being scraped form sites ok and the process_item method is being called correctly. However the spider_opened and spider_closed methods are not being called.

class MyPipeline(object):

    def __init__(self):
        log.msg("Initializing Pipeline")
        self.conn = None
        self.cur = None

    def spider_opened(self, spider):
        log.msg("Pipeline.spider_opened called", level=log.DEBUG)

    def spider_closed(self, spider):
        log.msg("Pipeline.spider_closed called", level=log.DEBUG)

    def process_item(self, item, spider):
        log.msg("Processsing item " + item['title'], level=log.DEBUG)

__init__ 和 process_item 日志消息都显示在日志中，但是 spider_open 和 spider_close 日志消息不是.

Both the __init__ and process_item logging messages are displyed in the log, but the spider_open and spider_close logging messages are not.

我需要使用 spider_opened 和 spider_closed 方法，因为我想使用它们来打开和关闭与数据库的连接，但日志中没有为它们显示任何内容.

I need to use the spider_opened and spider_closed methods as I want to use them to open and close a connection to a database, but nothing is showing up in the log for them.

如果有人有任何建议，那将非常有用.

If anyone has any suggested that would be very useful.

推荐答案

抱歉，刚发完这个就找到了.您必须添加:

Sorry, found it just after I posted this. You have to add:

dispatcher.connect(self.spider_opened, signals.spider_opened)
dispatcher.connect(self.spider_closed, signals.spider_closed)

在 __init__ 否则它永远不会收到调用它的信号

in __init__ otherwise it never receives the signal to call it

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