scrapy日志未写入日志文件

Question

我有一个派生自BaseSpider的爬虫类。我调用了self.log，但没有任何内容写入日志文件。我在命令行LOG_FILE和LOG_LEVEL上配置了日志文件，但是爬行器日志输出没有写入到该文件中。如何将爬虫日志写入普通日志文件？

Answer 1

你确定你的回调会被调用吗？

因为在文件example.py中有这个简单的爬行器

from scrapy.spider import BaseSpider

class ExampleSpider(BaseSpider):
    name = "example"
    start_urls = ['http://www.example.com/']

    def parse(self, response):
        self.log('************* my log ***********')

并使用scrapy runspider example.py --set LOG_FILE=logfile运行它，这是文件内容：

2013-09-30 22:55:12-0400 [scrapy] INFO: Scrapy 0.16.5 started (bot: mybot)
2013-09-30 22:55:12-0400 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2013-09-30 21:55:12-0500 [scrapy] DEBUG: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMiddleware, ChunkedTransferMiddleware, DownloaderStats
2013-09-30 21:55:12-0500 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2013-09-30 21:55:12-0500 [scrapy] DEBUG: Enabled item pipelines: MybotPipeline
2013-09-30 21:55:12-0500 [example] INFO: Spider opened
2013-09-30 21:55:12-0500 [example] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2013-09-30 21:55:12-0500 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2013-09-30 21:55:12-0500 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2013-09-30 21:55:13-0500 [example] DEBUG: Crawled (200) <GET http://www.example.com/> (referer: None)
2013-09-30 21:55:13-0500 [example] DEBUG: ************* my log ***********
2013-09-30 21:55:13-0500 [example] INFO: Closing spider (finished)
2013-09-30 21:55:13-0500 [example] INFO: Dumping Scrapy stats:
    {'downloader/request_bytes': 221,
     'downloader/request_count': 1,
     'downloader/request_method_count/GET': 1,
     'downloader/response_bytes': 1611,
     'downloader/response_count': 1,
     'downloader/response_status_count/200': 1,
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2013, 10, 1, 2, 55, 13, 315807),
     'log_count/DEBUG': 8,
     'log_count/INFO': 4,
     'response_received_count': 1,
     'scheduler/dequeued': 1,
     'scheduler/dequeued/memory': 1,
     'scheduler/enqueued': 1,
     'scheduler/enqueued/memory': 1,
     'start_time': datetime.datetime(2013, 10, 1, 2, 55, 12, 991150)}
2013-09-30 21:55:13-0500 [example] INFO: Spider closed (finished)

尝试将失败添加到回调中，以确保被调用。像raise Exception这样简单的东西。如果你在运行它的时候没有得到异常，那么你的回调就不会被调用。