1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
import os, cPickle as pickle
from scrapy import signals
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'))
crawler.signals.connect(obj.spider_closed, signal=signals.spider_closed)
crawler.signals.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, 'rb') as f:
spider.state = pickle.load(f)
else:
spider.state = {}
@property
def statefn(self):
return os.path.join(self.jobdir, 'spider.state')
|
