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"""
MemoryDebugger extension
See documentation in docs/topics/extensions.rst
"""
import gc
from scrapy import signals
from scrapy.exceptions import NotConfigured
from scrapy.utils.trackref import live_refs
class MemoryDebugger(object):
def __init__(self, stats):
self.stats = stats
@classmethod
def from_crawler(cls, crawler):
if not crawler.settings.getbool('MEMDEBUG_ENABLED'):
raise NotConfigured
o = cls(crawler.stats)
crawler.signals.connect(o.spider_closed, signal=signals.spider_closed)
return o
def spider_closed(self, spider, reason):
gc.collect()
self.stats.set_value('memdebug/gc_garbage_count', len(gc.garbage), spider=spider)
for cls, wdict in live_refs.iteritems():
if not wdict:
continue
self.stats.set_value('memdebug/live_refs/%s' % cls.__name__, len(wdict), spider=spider)
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