def __init__(self, settings=None):
self.signals = SignalManager(self)
self.signals.connect(self.on_spider_closed,
CrawlerProcessSignals.spider_closed)
self._finished_jobs = []
self._paused_jobs = set()
self.procmon = ProcessStatsMonitor()
self.procmon.start()
super(ArachnadoCrawlerProcess, self).__init__(settings or {})
# don't log DepthMiddleware messages
# see https://github.com/scrapy/scrapy/issues/1308
logging.getLogger("scrapy.spidermiddlewares.depth").setLevel(
logging.INFO)
def __init__(self, settings=None):
self.signals = SignalManager(self)
self.signals.connect(self.on_spider_closed, CrawlerProcessSignals.spider_closed)
self._finished_jobs = []
self._paused_jobs = set()
self.procmon = ProcessStatsMonitor()
self.procmon.start()
super(ArachnadoCrawlerProcess, self).__init__(settings or {})
# don't log DepthMiddleware messages
# see https://github.com/scrapy/scrapy/issues/1308
logging.getLogger("scrapy.spidermiddlewares.depth").setLevel(logging.INFO)
class ArachnadoCrawlerProcess(CrawlerProcess):
"""
CrawlerProcess which sets up a global signals manager,
assigns unique ids to each spider job, workarounds some Scrapy
issues and provides extra stats.
"""
crawl_ids = itertools.count(start=1)
def __init__(self, settings=None):
self.signals = SignalManager(self)
self.signals.connect(self.on_spider_closed,
CrawlerProcessSignals.spider_closed)
self._finished_jobs = []
self._paused_jobs = set()
self.procmon = ProcessStatsMonitor()
self.procmon.start()
super(ArachnadoCrawlerProcess, self).__init__(settings or {})
# don't log DepthMiddleware messages
# see https://github.com/scrapy/scrapy/issues/1308
logging.getLogger("scrapy.spidermiddlewares.depth").setLevel(
logging.INFO)
def crawl(self, crawler_or_spidercls, *args, **kwargs):
kwargs['crawl_id'] = next(self.crawl_ids)
crawler = crawler_or_spidercls
if not isinstance(crawler_or_spidercls, Crawler):
crawler = self._create_crawler(crawler_or_spidercls)
# aggregate all crawler signals
for name in SCRAPY_SIGNAL_NAMES:
crawler.signals.connect(self._resend_signal,
getattr(signals, name))
# aggregate signals from crawler EventedStatsCollectors
if hasattr(crawler.stats, "signals"):
crawler.stats.signals.connect(self._resend_signal,
stats.stats_changed)
d = super(ArachnadoCrawlerProcess, self).crawl(crawler_or_spidercls,
*args, **kwargs)
return d
def _create_crawler(self, spidercls):
if isinstance(spidercls, six.string_types):
spidercls = self.spider_loader.load(spidercls)
return ArachnadoCrawler(spidercls, self.settings)
def stop_job(self, crawl_id):
""" Stop a single crawl job """
self.get_crawler(crawl_id).stop()
def pause_job(self, crawl_id):
""" Pause a crawling job """
self._paused_jobs.add(crawl_id)
self.get_crawler(crawl_id).engine.pause()
def resume_job(self, crawl_id):
""" Resume a crawling job """
self._paused_jobs.remove(crawl_id)
self.get_crawler(crawl_id).engine.unpause()
def get_crawler(self, crawl_id):
for crawler in self.crawlers:
if getattr(crawler.spider, "crawl_id") == crawl_id:
return crawler
raise KeyError("Job is not known: %s" % crawl_id)
def _resend_signal(self, **kwargs):
# FIXME: this is a mess. Signal handling should be unified somehow:
# there shouldn't be two separate code paths
# for CrawlerProcessSignals and STAT_SIGNALS.
signal = kwargs['signal']
if signal in STAT_SIGNALS:
signal = STAT_SIGNALS[signal]
kwargs['crawler'] = kwargs.pop('sender').crawler
else:
signal = CrawlerProcessSignals.signal(signal)
kwargs['crawler'] = kwargs.pop('sender')
kwargs['signal'] = signal
if signal.supports_defer:
return self.signals.send_catch_log_deferred(**kwargs)
else:
return self.signals.send_catch_log(**kwargs)
def stop(self):
""" Terminate the process (exit from application). """
self.procmon.stop()
return super(ArachnadoCrawlerProcess, self).stop()
def on_spider_closed(self, spider, reason):
# spiders are closed not that often, insert(0,...) should be fine
self._finished_jobs.insert(
0, {
'id': spider.crawl_id,
'job_id': getattr(spider, 'motor_job_id'),
'seed': spider.domain,
'status': reason,
'stats': spider.crawler.stats.get_stats(spider),
'downloads': self._downloader_stats(spider.crawler)
})
# FIXME: methods below are ugly for two reasons:
# 1. they assume spiders have certain attributes;
# 2. they try to get crawling status based on auxilary information.
def get_jobs(self):
""" Return a list of active jobs """
crawlers = [
crawler for crawler in self.crawlers if crawler.spider is not None
]
return [
{
'id': crawler.spider.crawl_id,
'job_id': getattr(crawler.spider, 'motor_job_id'),
'seed': crawler.spider.domain,
'status': self._get_crawler_status(crawler),
'stats':
crawler.spider.crawler.stats.get_stats(crawler.spider),
'downloads': self._downloader_stats(crawler)
# 'engine_info': dict(get_engine_status(crawler.engine))
} for crawler in crawlers
]
@classmethod
def _downloader_stats(cls, crawler):
downloader = crawler.engine.downloader
return {
'active': [cls._request_info(req) for req in downloader.active],
'slots':
sorted([
cls._slot_info(key, slot)
for key, slot in downloader.slots.items()
],
key=operator.itemgetter('key'))
}
@classmethod
def _request_info(cls, request):
return {'url': request.url, 'method': request.method}
@classmethod
def _slot_info(cls, key, slot):
return {
'key': key,
'concurrency': slot.concurrency,
'delay': slot.delay,
'lastseen': slot.lastseen,
'len(queue)': len(slot.queue),
'transferring':
[cls._request_info(req) for req in slot.transferring],
'active': [cls._request_info(req) for req in slot.active],
}
def _get_crawler_status(self, crawler):
if crawler.spider is None:
return "unknown"
if not crawler.crawling:
return "stopping"
if int(crawler.spider.crawl_id) in self._paused_jobs:
return "suspended"
return "crawling"
@property
def jobs(self):
""" Current crawl state """
# filter out active jobs which are in fact finished
finished_ids = {job['id'] for job in self._finished_jobs}
active_jobs = [
job for job in self.get_jobs() if job['id'] not in finished_ids
]
return active_jobs + self._finished_jobs
class ArachnadoCrawlerProcess(CrawlerProcess):
"""
CrawlerProcess which sets up a global signals manager,
assigns unique ids to each spider job, workarounds some Scrapy
issues and provides extra stats.
"""
crawl_ids = itertools.count(start=1)
def __init__(self, settings=None):
self.signals = SignalManager(self)
self.signals.connect(self.on_spider_closed, CrawlerProcessSignals.spider_closed)
self._finished_jobs = []
self._paused_jobs = set()
self.procmon = ProcessStatsMonitor()
self.procmon.start()
super(ArachnadoCrawlerProcess, self).__init__(settings or {})
# don't log DepthMiddleware messages
# see https://github.com/scrapy/scrapy/issues/1308
logging.getLogger("scrapy.spidermiddlewares.depth").setLevel(logging.INFO)
def crawl(self, crawler_or_spidercls, *args, **kwargs):
kwargs["crawl_id"] = next(self.crawl_ids)
crawler = crawler_or_spidercls
if not isinstance(crawler_or_spidercls, Crawler):
crawler = self._create_crawler(crawler_or_spidercls)
# aggregate all crawler signals
for name in SCRAPY_SIGNAL_NAMES:
crawler.signals.connect(self._resend_signal, getattr(signals, name))
# aggregate signals from crawler EventedStatsCollectors
if hasattr(crawler.stats, "signals"):
crawler.stats.signals.connect(self._resend_signal, stats.stats_changed)
d = super(ArachnadoCrawlerProcess, self).crawl(crawler_or_spidercls, *args, **kwargs)
return d
def _create_crawler(self, spidercls):
if isinstance(spidercls, six.string_types):
spidercls = self.spider_loader.load(spidercls)
return ArachnadoCrawler(spidercls, self.settings)
def stop_job(self, crawl_id):
""" Stop a single crawl job """
self.get_crawler(crawl_id).stop()
def pause_job(self, crawl_id):
""" Pause a crawling job """
self._paused_jobs.add(crawl_id)
self.get_crawler(crawl_id).engine.pause()
def resume_job(self, crawl_id):
""" Resume a crawling job """
self._paused_jobs.remove(crawl_id)
self.get_crawler(crawl_id).engine.unpause()
def get_crawler(self, crawl_id):
for crawler in self.crawlers:
if getattr(crawler.spider, "crawl_id") == crawl_id:
return crawler
raise KeyError("Job is not known: %s" % crawl_id)
def _resend_signal(self, **kwargs):
# FIXME: this is a mess. Signal handling should be unified somehow:
# there shouldn't be two separate code paths
# for CrawlerProcessSignals and STAT_SIGNALS.
signal = kwargs["signal"]
if signal in STAT_SIGNALS:
signal = STAT_SIGNALS[signal]
kwargs["crawler"] = kwargs.pop("sender").crawler
else:
signal = CrawlerProcessSignals.signal(signal)
kwargs["crawler"] = kwargs.pop("sender")
kwargs["signal"] = signal
if signal.supports_defer:
return self.signals.send_catch_log_deferred(**kwargs)
else:
return self.signals.send_catch_log(**kwargs)
def stop(self):
""" Terminate the process (exit from application). """
self.procmon.stop()
return super(ArachnadoCrawlerProcess, self).stop()
def on_spider_closed(self, spider, reason):
# spiders are closed not that often, insert(0,...) should be fine
self._finished_jobs.insert(
0,
{
"id": spider.crawl_id,
"job_id": getattr(spider, "motor_job_id"),
"seed": spider.domain,
"status": reason,
"stats": spider.crawler.stats.get_stats(spider),
"downloads": self._downloader_stats(spider.crawler),
},
)
# FIXME: methods below are ugly for two reasons:
# 1. they assume spiders have certain attributes;
# 2. they try to get crawling status based on auxilary information.
def get_jobs(self):
""" Return a list of active jobs """
crawlers = [crawler for crawler in self.crawlers if crawler.spider is not None]
return [
{
"id": crawler.spider.crawl_id,
"job_id": getattr(crawler.spider, "motor_job_id"),
"seed": crawler.spider.domain,
"status": self._get_crawler_status(crawler),
"stats": crawler.spider.crawler.stats.get_stats(crawler.spider),
"downloads": self._downloader_stats(crawler)
# 'engine_info': dict(get_engine_status(crawler.engine))
}
for crawler in crawlers
]
@classmethod
def _downloader_stats(cls, crawler):
downloader = crawler.engine.downloader
return {
"active": [cls._request_info(req) for req in downloader.active],
"slots": sorted(
[cls._slot_info(key, slot) for key, slot in downloader.slots.items()], key=operator.itemgetter("key")
),
}
@classmethod
def _request_info(cls, request):
return {"url": request.url, "method": request.method}
@classmethod
def _slot_info(cls, key, slot):
return {
"key": key,
"concurrency": slot.concurrency,
"delay": slot.delay,
"lastseen": slot.lastseen,
"len(queue)": len(slot.queue),
"transferring": [cls._request_info(req) for req in slot.transferring],
"active": [cls._request_info(req) for req in slot.active],
}
def _get_crawler_status(self, crawler):
if crawler.spider is None:
return "unknown"
if not crawler.crawling:
return "stopping"
if int(crawler.spider.crawl_id) in self._paused_jobs:
return "suspended"
return "crawling"
@property
def jobs(self):
""" Current crawl state """
# filter out active jobs which are in fact finished
finished_ids = {job["id"] for job in self._finished_jobs}
active_jobs = [job for job in self.get_jobs() if job["id"] not in finished_ids]
return active_jobs + self._finished_jobs
