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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:
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.items():
if not wdict:
continue
self.stats.set_value(
f"memdebug/live_refs/{cls.__name__}", len(wdict), spider=spider
)