如何在接收到SIGINT或Scrapyd的cancel.json调用时回调Scrapy爬行器方法？

import signal
from scrapy import signals

class CustomSignalHandler(object):
    def __init__(self, crawler):
        self.crawler = crawler
        self.signals = crawler.signals
        self.signals.connect(self.handle_signal, signal=signal.SIGINT)

    def handle_signal(self):
        # 在这里编写回调逻辑，例如取消爬取操作
        self.crawler.engine.close_spider(spider, 'Cancelled by user')

# 在入口文件中注册自定义的信号处理器
def main():
    from scrapy.crawler import CrawlerProcess
    from myproject.spiders import MySpider

    process = CrawlerProcess()
    spider = MySpider()

    # 实例化自定义的信号处理器类，并注册为Scrapy的信号处理器
    signal_handler = CustomSignalHandler(process.crawler)
    process.crawler.signals.connect(signal_handler.handle_signal, signal=signal.SIGINT)

    process.crawl(spider)
    process.start()

if __name__ == '__main__':
    main()