我有一个从网站下载图像的scrapy 脚本。本地工作完美，也似乎在生产服务器上，但尽管没有收到任何错误，但不要保存图像。
这是生产服务器上的输出：
2013-07-10 05:12:33+0200 [scrapy] INFO: Scrapy 0.16.5 started (bot: mybot)
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMiddleware, ChunkedTransferMiddleware, DownloaderStats
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Enabled item pipelines: CustomImagesPipeline
2013-07-10 05:12:33+0200 [bh] INFO: Spider opened
2013-07-10 05:12:33+0200 [bh] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6023
2013-07-10 05:12:33+0200 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2013-07-10 05:12:34+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/find/brands.jsp> (referer: None)
2013-07-10 05:12:37+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/c/browse/BrandName/ci/5732/N/4232860366> (referer: http://www.mysite.com/find/brands.jsp)
2013-07-10 05:12:41+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/c/browse/Accessories-for-Camcorders/ci/5766/N/4232860347> (referer: http://www.mysite.com/c/browse/BrandName/ci/5732/N/4232860366)
2013-07-10 05:12:44+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/c/buy/CategoryName/ci/5786/N/4232860316> (referer: http://www.mysite.com/c/browse/BrandName/ci/5732/N/4232860366)
2013-07-10 05:12:46+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/images/images500x500/927001.jpg> (referer: None)
2013-07-10 05:12:46+0200 [bh] DEBUG: Image (downloaded): Downloaded image from <GET http://www.mysite.com/images/images500x500/927001.jpg> referred in <None>
2013-07-10 05:12:46+0200 [bh] DEBUG: Scraped from <200 http://www.mysite.com/c/buy/CategoryName/ci/5786/N/4232860316>
{'code': u'RFE234',
'image_urls': u'http://www.mysite.com/images/images500x500/927001.jpg',
'images': []}
2013-07-10 05:12:50+0200 [bh] DEBUG: Crawled (200) <GET http://www.mysite.com/images/images500x500/896290.jpg> (referer: None)
2013-07-10 05:12:50+0200 [bh] DEBUG: Image (downloaded): Downloaded image from <GET http://www.mysite.com/images/images500x500/896290.jpg> referred in <None>
2013-07-10 05:12:50+0200 [bh] DEBUG: Scraped from <200 http://www.mysite.com/c/buy/CategoryName/ci/5786/N/4232860316>
{'code': u'ABCD123',
'image_urls': u'http://www.mysite.com/images/images500x500/896290.jpg',
'images': []}
2013-07-10 05:13:18+0200 [bh] INFO: Closing spider (finished)
2013-07-10 05:13:18+0200 [bh] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 11107,
'downloader/request_count': 14,
'downloader/request_method_count/GET': 14,
'downloader/response_bytes': 527125,
'downloader/response_count': 14,
'downloader/response_status_count/200': 14,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2013, 7, 10, 3, 13, 18, 673536),
'image_count': 10,
'image_status_count/downloaded': 10,
'item_scraped_count': 10,
'log_count/DEBUG': 40,
'log_count/INFO': 4,
'request_depth_max': 2,
'response_received_count': 14,
'scheduler/dequeued': 4,
'scheduler/dequeued/memory': 4,
'scheduler/enqueued': 4,
'scheduler/enqueued/memory': 4,
'start_time': datetime.datetime(2013, 7, 10, 3, 12, 33, 367609)}
2013-07-10 05:13:18+0200 [bh] INFO: Spider closed (finished)
我注意到的区别是我的项目上的“图像”变量是一个空列表 []，而不是在本地通常是这样的：
2013-07-10 00:22:31-0300 [bh] DEBUG: Scraped from <200 http://www.mysite.com/c/buy/CategoryName/ci/5742/N/4232860364>
{'code': u'BGT453',
'image_urls': u'http://www.mysite.com/images/images500x500/834569.jpg',
'images': [{'checksum': 'ef2e2e42eeb06591bdfbdee568d29df1',
'path': u'bh/BGT453.jpg',
'url': 'http://www.mysite.com/images/images500x500/834569.jpg'}]}
主要问题是输出中没有错误，因此不知道如何解决问题。
我更新了 PIL 和相同的 scrapy 版本 0.16.5 和 python 2.7
更新 1
...
2013-07-10 06:48:50+0200 [scrapy] DEBUG: This is a DEBUG on CustomImagesPipeline !!
...
更新 2 我创建了 CustomImagesPipeline 以将带有产品代码的图像保存为文件名。我从 ImagesPipeline 复制了代码，只做了一些更改。
from scrapy import log
from twisted.internet import defer, threads
from scrapy.http import Request
from cStringIO import StringIO
from PIL import Image
import time
from scrapy.contrib.pipeline.images import ImagesPipeline
class CustomImagesPipeline(ImagesPipeline):
def image_key(self, url, image_name):
path = 'bh/%s.jpg' % image_name
return path
def get_media_requests(self, item, info):
log.msg("This is a DEBUG on CustomImagesPipeline !! ", level=log.DEBUG)
yield Request(item['image_urls'], meta=dict(image_name=item['code']))
def get_images(self, response, request, info):
key = self.image_key(request.url, request.meta.get('image_name'))
orig_image = Image.open(StringIO(response.body))
width, height = orig_image.size
if width < self.MIN_WIDTH or height < self.MIN_HEIGHT:
raise ImageException("Image too small (%dx%d < %dx%d)" % (width, height, self.MIN_WIDTH, self.MIN_HEIGHT))
image, buf = self.convert_image(orig_image)
yield key, image, buf
for thumb_id, size in self.THUMBS.iteritems():
thumb_key = self.thumb_key(request.url, thumb_id)
thumb_image, thumb_buf = self.convert_image(image, size)
yield thumb_key, thumb_image, thumb_buf
def media_downloaded(self, response, request, info):
referer = request.headers.get('Referer')
if response.status != 200:
log.msg(format='Image (code: %(status)s): Error downloading image from %(request)s referred in <%(referer)s>',
level=log.WARNING, spider=info.spider,
status=response.status, request=request, referer=referer)
raise ImageException('download-error')
if not response.body:
log.msg(format='Image (empty-content): Empty image from %(request)s referred in <%(referer)s>: no-content',
level=log.WARNING, spider=info.spider,
request=request, referer=referer)
raise ImageException('empty-content')
status = 'cached' if 'cached' in response.flags else 'downloaded'
log.msg(format='Image (%(status)s): Downloaded image from %(request)s referred in <%(referer)s>',
level=log.DEBUG, spider=info.spider,
status=status, request=request, referer=referer)
self.inc_stats(info.spider, status)
try:
key = self.image_key(request.url, request.meta.get('image_name'))
checksum = self.image_downloaded(response, request, info)
except ImageException as exc:
whyfmt = 'Image (error): Error processing image from %(request)s referred in <%(referer)s>: %(errormsg)s'
log.msg(format=whyfmt, level=log.WARNING, spider=info.spider,
request=request, referer=referer, errormsg=str(exc))
raise
except Exception as exc:
whyfmt = 'Image (unknown-error): Error processing image from %(request)s referred in <%(referer)s>'
log.err(None, whyfmt % {'request': request, 'referer': referer}, spider=info.spider)
raise ImageException(str(exc))
return {'url': request.url, 'path': key, 'checksum': checksum}
def media_to_download(self, request, info):
def _onsuccess(result):
if not result:
return # returning None force download
last_modified = result.get('last_modified', None)
if not last_modified:
return # returning None force download
age_seconds = time.time() - last_modified
age_days = age_seconds / 60 / 60 / 24
if age_days > self.EXPIRES:
return # returning None force download
referer = request.headers.get('Referer')
log.msg(format='Image (uptodate): Downloaded %(medianame)s from %(request)s referred in <%(referer)s>',
level=log.DEBUG, spider=info.spider,
medianame=self.MEDIA_NAME, request=request, referer=referer)
self.inc_stats(info.spider, 'uptodate')
checksum = result.get('checksum', None)
return {'url': request.url, 'path': key, 'checksum': checksum}
key = self.image_key(request.url, request.meta.get('image_name'))
dfd = defer.maybeDeferred(self.store.stat_image, key, info)
dfd.addCallbacks(_onsuccess, lambda _: None)
dfd.addErrback(log.err, self.__class__.__name__ + '.store.stat_image')
return dfd
本地系统 Mac OSX，生产服务器 Debian GNU/Linux 7 (wheezy)