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import logging
from twisted.internet import task
from scrapy.exceptions import NotConfigured
from scrapy import signals
logger = logging.getLogger(__name__)
class LogStats(object):
"""Log basic scraping stats periodically"""
def __init__(self, stats, interval=60.0):
self.stats = stats
self.interval = interval
self.multiplier = 60.0 / self.interval
self.task = None
@classmethod
def from_crawler(cls, crawler):
interval = crawler.settings.getfloat('LOGSTATS_INTERVAL')
if not interval:
raise NotConfigured
o = cls(crawler.stats, interval)
crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
crawler.signals.connect(o.spider_closed, signal=signals.spider_closed)
return o
def spider_opened(self, spider):
self.pagesprev = 0
self.itemsprev = 0
self.task = task.LoopingCall(self.log, spider)
self.task.start(self.interval)
def log(self, spider):
items = self.stats.get_value('item_scraped_count', 0)
pages = self.stats.get_value('response_received_count', 0)
irate = (items - self.itemsprev) * self.multiplier
prate = (pages - self.pagesprev) * self.multiplier
self.pagesprev, self.itemsprev = pages, items
msg = ("Crawled %(pages)d pages (at %(pagerate)d pages/min), "
"scraped %(items)d items (at %(itemrate)d items/min)")
log_args = {'pages': pages, 'pagerate': prate,
'items': items, 'itemrate': irate}
logger.info(msg, log_args, extra={'spider': spider})
def spider_closed(self, spider, reason):
if self.task and self.task.running:
self.task.stop()
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