I'm trying to parse through PLoS's RSS feed to pick up new publications. The RSS feed is located here.
Below is my spider:
from scrapy.contrib.spiders import XMLFeedSpiderclass PLoSSpider(XMLFeedSpider): name = "plos" itertag = 'entry' allowed_domains = ["plosone.org"] start_urls = [ ('http://www.plosone.org/article/feed/search''?unformattedQuery=*%3A*&sort=Date%2C+newest+first') ] def parse_node(self, response, node): passThis configuration produces the following log output (note the exception):
$ scrapy crawl plos2015-02-06 00:19:08+0100 [scrapy] INFO: Scrapy 0.24.4 started (bot: plos)2015-02-06 00:19:08+0100 [scrapy] INFO: Optional features available: ssl, http11, boto2015-02-06 00:19:08+0100 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'plos.spiders', 'SPIDER_MODULES': ['plos.spiders'], 'BOT_NAME': 'plos'}2015-02-06 00:19:08+0100 [scrapy] INFO: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState2015-02-06 00:19:08+0100 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats2015-02-06 00:19:08+0100 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware2015-02-06 00:19:08+0100 [scrapy] INFO: Enabled item pipelines: 2015-02-06 00:19:08+0100 [plos] INFO: Spider opened2015-02-06 00:19:08+0100 [plos] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)2015-02-06 00:19:08+0100 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:60232015-02-06 00:19:08+0100 [scrapy] DEBUG: Web service listening on 127.0.0.1:60802015-02-06 00:19:09+0100 [plos] DEBUG: Crawled (200) <GET http://www.plosone.org/article/feed/search?unformattedQuery=*%3A*&sort=Date%2C+newest+first> (referer: None)2015-02-06 00:19:09+0100 [plos] ERROR: Spider error processing <GET http://www.plosone.org/article/feed/search?unformattedQuery=*%3A*&sort=Date%2C+newest+first> Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 824, in runUntilCurrent call.func(*call.args, **call.kw) File "/usr/lib/python2.7/dist-packages/twisted/internet/task.py", line 638, in _tick taskObj._oneWorkUnit() File "/usr/lib/python2.7/dist-packages/twisted/internet/task.py", line 484, in _oneWorkUnit result = next(self._iterator) File "/usr/local/lib/python2.7/dist-packages/scrapy/utils/defer.py", line 57, in <genexpr> work = (callable(elem, *args, **named) for elem in iterable) --- <exception caught here> --- File "/usr/local/lib/python2.7/dist-packages/scrapy/utils/defer.py", line 96, in iter_errback yield next(it) File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spidermiddleware/offsite.py", line 26, in process_spider_output for x in result: File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spidermiddleware/referer.py", line 22, in <genexpr> return (_set_referer(r) for r in result or ()) File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spidermiddleware/urllength.py", line 33, in <genexpr> return (r for r in result or () if _filter(r)) File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spidermiddleware/depth.py", line 50, in <genexpr> return (r for r in result or () if _filter(r)) File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spiders/feed.py", line 61, in parse_nodes for selector in nodes: File "/usr/local/lib/python2.7/dist-packages/scrapy/contrib/spiders/feed.py", line 87, in _iternodes for node in xmliter(response, self.itertag): File "/usr/local/lib/python2.7/dist-packages/scrapy/utils/iterators.py", line 31, in xmliter yield Selector(text=nodetext, type='xml').xpath('//'+ nodename)[0] exceptions.IndexError: list index out of range2015-02-06 00:19:09+0100 [plos] INFO: Closing spider (finished)2015-02-06 00:19:09+0100 [plos] INFO: Dumping Scrapy stats: {'downloader/request_bytes': 282,'downloader/request_count': 1,'downloader/request_method_count/GET': 1,'downloader/response_bytes': 7590,'downloader/response_count': 1,'downloader/response_status_count/200': 1,'finish_reason': 'finished','finish_time': datetime.datetime(2015, 2, 5, 23, 19, 9, 379574),'log_count/DEBUG': 3,'log_count/ERROR': 1,'log_count/INFO': 7,'response_received_count': 1,'scheduler/dequeued': 1,'scheduler/dequeued/memory': 1,'scheduler/enqueued': 1,'scheduler/enqueued/memory': 1,'spider_exceptions/IndexError': 1,'start_time': datetime.datetime(2015, 2, 5, 23, 19, 8, 834428)}2015-02-06 00:19:09+0100 [plos] INFO: Spider closed (finished)Changing itertag = "entry" to itertag = "//entry" removes the exception, but no items are scraped. I also tried using scrapy.log.msg to log a message from within parse_node, but nothing appears and no nodes are reported as having been scraped.
What am I doing wrong?
Edit
Following alecxe's advice, here is a spider with namepaces defined. The documentation is a bit skimpy so I'm still not sure why my logging calls aren't showing up...
from scrapy import logfrom scrapy.contrib.spiders import XMLFeedSpiderclass PLoSSpider(XMLFeedSpider): name = "plos" allowed_domains = ["plosone.org"] namespaces = [ ('plos', ('http://www.plosone.org/article/feed/search''?unformattedQuery=*%3A*&sort=Date%2C+newest+first') ) ] itertag = 'plos:entry'def parse_node(self, response, node): log.msg('*** PING ***')And here is the output:
$ scrapy crawl plos2015-02-06 18:33:01+0100 [scrapy] INFO: Scrapy 0.24.4 started (bot: plos)2015-02-06 18:33:01+0100 [scrapy] INFO: Optional features available: ssl, http11, boto2015-02-06 18:33:01+0100 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'plos.spiders', 'SPIDER_MODULES': ['plos.spiders'], 'BOT_NAME': 'plos'}2015-02-06 18:33:01+0100 [scrapy] INFO: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState2015-02-06 18:33:02+0100 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats2015-02-06 18:33:02+0100 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware2015-02-06 18:33:02+0100 [scrapy] INFO: Enabled item pipelines: 2015-02-06 18:33:02+0100 [plos] INFO: Spider opened2015-02-06 18:33:02+0100 [plos] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)2015-02-06 18:33:02+0100 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:60232015-02-06 18:33:02+0100 [scrapy] DEBUG: Web service listening on 127.0.0.1:60802015-02-06 18:33:02+0100 [plos] INFO: Closing spider (finished)2015-02-06 18:33:02+0100 [plos] INFO: Dumping Scrapy stats: {'finish_reason': 'finished','finish_time': datetime.datetime(2015, 2, 6, 17, 33, 2, 65414),'log_count/DEBUG': 2,'log_count/INFO': 7,'start_time': datetime.datetime(2015, 2, 6, 17, 33, 2, 60311)}2015-02-06 18:33:02+0100 [plos] INFO: Spider closed (finished)It should further be noted that running scrapy shell "http://www.plosone.org/article/feed/search?unformattedQuery=*%3A*&sort=Date%2C+newest+first" followed by response.xpath('//entry') produces an empty list ([]). Yet, if you look at the raw XML data, you can see the <entry> tags plain as day. I'm at a complete loss, here...
