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from __future__ import with_statement
import os, cPickle as pickle
from scrapy import signals
from scrapy.exceptions import NotConfigured
from scrapy.xlib.pydispatch import dispatcher
class SpiderState(object):
"""Store and load spider state during a scraping job"""
def __init__(self, jobdir=None):
self.jobdir = jobdir
@classmethod
def from_crawler(cls, crawler):
obj = cls(crawler.settings.get('JOBDIR'))
dispatcher.connect(obj.spider_closed, signal=signals.spider_closed)
dispatcher.connect(obj.spider_opened, signal=signals.spider_opened)
return obj
def spider_closed(self, spider):
if self.jobdir:
with open(self.statefn, 'wb') as f:
pickle.dump(spider.state, f, protocol=2)
def spider_opened(self, spider):
if self.jobdir and os.path.exists(self.statefn):
with open(self.statefn) as f:
spider.state = pickle.load(f)
else:
spider.state = {}
@property
def statefn(self):
return os.path.join(self.jobdir, 'spider.state')
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