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from __future__ import print_function
import os
from scrapy import log
from scrapy.utils.job import job_dir
from scrapy.utils.request import request_fingerprint
class BaseDupeFilter(object):
@classmethod
def from_settings(cls, settings):
return cls()
def request_seen(self, request):
return False
def open(self): # can return deferred
pass
def close(self, reason): # can return a deferred
pass
def log(self, request, spider): # log that a request has been filtered
pass
class RFPDupeFilter(BaseDupeFilter):
"""Request Fingerprint duplicates filter"""
def __init__(self, path=None, debug=False):
self.file = None
self.fingerprints = set()
self.logdupes = True
self.debug = debug
if path:
self.file = open(os.path.join(path, 'requests.seen'), 'a+')
self.fingerprints.update(x.rstrip() for x in self.file)
@classmethod
def from_settings(cls, settings):
debug = settings.getbool('DUPEFILTER_DEBUG')
return cls(job_dir(settings), debug)
def request_seen(self, request):
fp = self.request_fingerprint(request)
if fp in self.fingerprints:
return True
self.fingerprints.add(fp)
if self.file:
self.file.write(fp + os.linesep)
def request_fingerprint(self, request):
return request_fingerprint(request)
def close(self, reason):
if self.file:
self.file.close()
def log(self, request, spider):
if self.debug:
fmt = "Filtered duplicate request: %(request)s"
log.msg(format=fmt, request=request, level=log.DEBUG, spider=spider)
elif self.logdupes:
fmt = ("Filtered duplicate request: %(request)s"
" - no more duplicates will be shown"
" (see DUPEFILTER_DEBUG to show all duplicates)")
log.msg(format=fmt, request=request, level=log.DEBUG, spider=spider)
self.logdupes = False
spider.crawler.stats.inc_value('dupefilter/filtered', spider=spider)
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