Source code for scrapy.extensions.corestats

"""
Extension for collecting core stats like items scraped and start/finish times
"""
from datetime import datetime

from scrapy import signals


[docs]class CoreStats: def __init__(self, stats): self.stats = stats self.start_time = None @classmethod def from_crawler(cls, crawler): o = cls(crawler.stats) crawler.signals.connect(o.spider_opened, signal=signals.spider_opened) crawler.signals.connect(o.spider_closed, signal=signals.spider_closed) crawler.signals.connect(o.item_scraped, signal=signals.item_scraped) crawler.signals.connect(o.item_dropped, signal=signals.item_dropped) crawler.signals.connect(o.response_received, signal=signals.response_received) return o def spider_opened(self, spider): self.start_time = datetime.utcnow() self.stats.set_value('start_time', self.start_time, spider=spider) def spider_closed(self, spider, reason): finish_time = datetime.utcnow() elapsed_time = finish_time - self.start_time elapsed_time_seconds = elapsed_time.total_seconds() self.stats.set_value('elapsed_time_seconds', elapsed_time_seconds, spider=spider) self.stats.set_value('finish_time', finish_time, spider=spider) self.stats.set_value('finish_reason', reason, spider=spider) def item_scraped(self, item, spider): self.stats.inc_value('item_scraped_count', spider=spider) def response_received(self, spider): self.stats.inc_value('response_received_count', spider=spider) def item_dropped(self, item, spider, exception): reason = exception.__class__.__name__ self.stats.inc_value('item_dropped_count', spider=spider) self.stats.inc_value(f'item_dropped_reasons_count/{reason}', spider=spider)