def _process_spidermw_output(self, output, request, response, spider):
"""Process each Request/Item (given in the output parameter) returned
from the given spider
"""
# TODO: keep closing state internally instead of checking engine
if spider in self.engine.closing:
return
elif isinstance(output, Request):
send_catch_log(signal=signals.request_received, request=output, \
spider=spider)
self.engine.crawl(request=output, spider=spider)
elif isinstance(output, BaseItem):
log.msg("Scraped %s in <%s>" % (output, request.url), level=log.DEBUG, \
spider=spider)
send_catch_log(signal=signals.item_scraped, sender=self.__class__, \
item=output, spider=spider, response=response)
self.sites[spider].itemproc_size += 1
# FIXME: this can't be called here because the stats spider may be
# already closed
#stats.max_value('scraper/max_itemproc_size', \
# self.sites[spider].itemproc_size, spider=spider)
dfd = self.itemproc.process_item(output, spider)
dfd.addBoth(self._itemproc_finished, output, spider)
return dfd
elif output is None:
pass
else:
log.msg("Spider must return Request, BaseItem or None, got %r in %s" % \
(type(output).__name__, request), log.ERROR, spider=spider)
def _on_success(response):
assert isinstance(response, (Response, Request))
if isinstance(response, Response):
response.request = request # tie request to response received
log.msg(log.formatter.crawled(request, response, spider), level=log.DEBUG, spider=spider)
send_catch_log(signal=signals.response_received, response=response, request=request, spider=spider)
return response
def close_spider(self, spider, reason):
send_catch_log(stats_spider_closing, spider=spider, reason=reason)
stats = self._stats.pop(spider)
send_catch_log(stats_spider_closed, spider=spider, reason=reason, spider_stats=stats)
if self._dump:
log.msg("Dumping spider stats:\n" + pprint.pformat(stats), spider=spider)
self._persist_stats(stats, spider)
def handle_spider_error(self, _failure, request, response, spider):
exc = _failure.value
if isinstance(exc, CloseSpider):
self.crawler.engine.close_spider(spider, exc.reason or "cancelled")
return
log.err(_failure, "Spider error processing %s" % request, spider=spider)
send_catch_log(signal=signals.spider_error, failure=_failure, response=response, spider=spider)
stats.inc_value("spider_exceptions/%s" % _failure.value.__class__.__name__, spider=spider)
def handle_spider_error(self, _failure, request, response, spider, propagated_failure=None):
referer = request.headers.get('Referer', None)
msg = "Spider error processing <%s> (referer: <%s>)" % \
(request.url, referer)
log.err(_failure, msg, spider=spider)
send_catch_log(signal=signals.spider_error, failure=_failure, response=response, \
spider=spider)
stats.inc_value("spider_exceptions/%s" % _failure.value.__class__.__name__, \
spider=spider)
def open_spider(self, spider):
log.msg("Spider opened", spider=spider)
self.next_request(spider)
self.downloader.open_spider(spider)
self.scraper.open_spider(spider)
stats.open_spider(spider)
send_catch_log(signals.spider_opened, sender=self.__class__, spider=spider)
def close_spider(self, spider, reason):
send_catch_log(stats_spider_closing, spider=spider, reason=reason)
stats = self._stats.pop(spider)
send_catch_log(stats_spider_closed, spider=spider, reason=reason, \
spider_stats=stats)
if self._dump:
log.msg("Dumping spider stats:\n" + pprint.pformat(stats), \
spider=spider)
self._persist_stats(stats, spider)
def _on_success(response):
assert isinstance(response, (Response, Request))
if isinstance(response, Response):
response.request = request # tie request to response received
log.msg(log.formatter.crawled(request, response, spider), \
level=log.DEBUG, spider=spider)
send_catch_log(signal=signals.response_received, \
response=response, request=request, spider=spider)
return response
def start(self):
"""Start the execution engine"""
if self.running:
return
self.start_time = time()
send_catch_log(signal=signals.engine_started, sender=self.__class__)
self._mainloop_task.start(5.0, now=True)
reactor.callWhenRunning(self._mainloop)
self.running = True
def test_error_logged_if_deferred_not_supported(self):
test_signal = object()
test_handler = lambda: defer.Deferred()
dispatcher.connect(test_handler, test_signal)
with LogCapture() as l:
send_catch_log(test_signal)
self.assertEqual(len(l.records), 1)
self.assertIn("Cannot return deferreds from signal handler", str(l))
dispatcher.disconnect(test_handler, test_signal)
def test_error_logged_if_deferred_not_supported(self):
test_signal = object()
test_handler = lambda: defer.Deferred()
dispatcher.connect(test_handler, test_signal)
with LogCapture() as l:
send_catch_log(test_signal)
self.assertEqual(len(l.records), 1)
self.assertIn("Cannot return deferreds from signal handler", str(l))
dispatcher.disconnect(test_handler, test_signal)
def open_spider(self, spider):
assert self.has_capacity(), "No free spider slots when opening %r" % \
spider.name
log.msg("Spider opened", spider=spider)
self.scheduler.open_spider(spider)
self.downloader.open_spider(spider)
self.scraper.open_spider(spider)
stats.open_spider(spider)
send_catch_log(signals.spider_opened, sender=self.__class__, spider=spider)
self.next_request(spider)
def _on_success(response):
"""handle the result of a page download"""
assert isinstance(response, (Response, Request))
if isinstance(response, Response):
response.request = request # tie request to response received
log.msg(log.formatter.crawled(request, response, spider), \
level=log.DEBUG, spider=spider)
send_catch_log(signal=signals.response_received, \
response=response, request=request, spider=spider)
return response
def handle_spider_error(self, _failure, request, response, spider):
exc = _failure.value
if isinstance(exc, CloseSpider):
self.crawler.engine.close_spider(spider, exc.reason or 'cancelled')
return
log.err(_failure, "Spider error processing %s" % request, spider=spider)
send_catch_log(signal=signals.spider_error, failure=_failure, response=response, \
spider=spider)
stats.inc_value("spider_exceptions/%s" % _failure.value.__class__.__name__, \
spider=spider)
def parse(self, response, basic_link_info, spider):
if not self.conditon_permit(response, basic_link_info, spider):
return ReturnStatus.move_on
self.log("use parser: %s" % type(self))
self.init_context(response, basic_link_info, spider)
item_num = self.process()
send_catch_log(signal=signals.item_extracted,
url=self.response.url, item_num=item_num)
return ReturnStatus.stop_it
def parse(self, response, basic_link_info, spider):
if not self.conditon_permit(response, basic_link_info, spider):
return ReturnStatus.move_on
self.log("use parser: %s" % type(self))
self.init_context(response, basic_link_info, spider)
link_num = self.process()
send_catch_log(signal=signals.link_extracted,
url=self.response.url,
link_num=link_num)
return ReturnStatus.stop_it
def test_error_logged_if_deferred_not_supported(self):
test_signal = object()
test_handler = lambda: defer.Deferred()
log_events = []
txlog.addObserver(log_events.append)
dispatcher.connect(test_handler, test_signal)
send_catch_log(test_signal)
self.assertTrue(log_events)
self.assertIn("Cannot return deferreds from signal handler", str(log_events))
txlog.removeObserver(log_events.append)
self.flushLoggedErrors()
dispatcher.disconnect(test_handler, test_signal)
def test_error_logged_if_deferred_not_supported(self):
test_signal = object()
test_handler = lambda: defer.Deferred()
log_events = []
txlog.addObserver(log_events.append)
dispatcher.connect(test_handler, test_signal)
send_catch_log(test_signal)
self.failUnless(log_events)
self.failUnless(
"Cannot return deferreds from signal handler" in str(log_events))
txlog.removeObserver(log_events.append)
self.flushLoggedErrors()
dispatcher.disconnect(test_handler, test_signal)
def execute(argv=None):
if argv is None:
argv = sys.argv
cmds = _get_commands_dict()
cmdname = _get_command_name(argv)
_update_default_settings("scrapy.conf.commands", cmdname)
_update_default_settings(settings["COMMANDS_SETTINGS_MODULE"], cmdname)
parser = optparse.OptionParser(
formatter=optparse.TitledHelpFormatter(), conflict_handler="resolve", add_help_option=False
)
if cmdname in cmds:
cmd = cmds[cmdname]
cmd.add_options(parser)
opts, args = parser.parse_args(args=argv[1:])
cmd.process_options(args, opts)
parser.usage = "%%prog %s %s" % (cmdname, cmd.syntax())
parser.description = cmd.long_desc()
if cmd.requires_project and not settings.settings_module:
print "Error running: scrapy-ctl.py %s\n" % cmdname
print "Cannot find project settings module in python path: %s" % settings.settings_module_path
sys.exit(1)
if opts.help:
parser.print_help()
sys.exit()
elif not cmdname:
cmd = ScrapyCommand()
cmd.add_options(parser)
opts, args = parser.parse_args(args=argv)
cmd.process_options(args, opts)
_print_usage(settings.settings_module)
sys.exit(2)
else:
print "Unknown command: %s\n" % cmdname
print 'Use "scrapy-ctl.py -h" for help'
sys.exit(2)
del args[0] # remove command name from args
send_catch_log(signal=command_executed, cmdname=cmdname, cmdobj=cmd, args=args, opts=opts)
from scrapy.core.manager import scrapymanager
scrapymanager.configure(control_reactor=True)
ret = _run_command(cmd, args, opts)
if ret is False:
parser.print_help()
def send(self, to, subject, body, cc=None, attachs=()):
if attachs:
msg = MIMEMultipart()
else:
msg = MIMENonMultipart('text', 'plain')
msg['From'] = self.mailfrom
msg['To'] = COMMASPACE.join(to)
msg['Date'] = formatdate(localtime=True)
msg['Subject'] = subject
rcpts = to[:]
if cc:
rcpts.extend(cc)
msg['Cc'] = COMMASPACE.join(cc)
if attachs:
msg.attach(MIMEText(body))
for attach_name, mimetype, f in attachs:
part = MIMEBase(*mimetype.split('/'))
part.set_payload(f.read())
Encoders.encode_base64(part)
part.add_header('Content-Disposition', 'attachment; filename="%s"' \
% attach_name)
msg.attach(part)
else:
msg.set_payload(body)
send_catch_log(signal=mail_sent,
to=to,
subject=subject,
body=body,
cc=cc,
attach=attachs,
msg=msg)
if self.debug:
log.msg('Debug mail sent OK: To=%s Cc=%s Subject="%s" Attachs=%d' % \
(to, cc, subject, len(attachs)), level=log.DEBUG)
return
dfd = self._sendmail(rcpts, msg.as_string())
dfd.addCallbacks(self._sent_ok,
self._sent_failed,
callbackArgs=[to, cc, subject,
len(attachs)],
errbackArgs=[to, cc, subject,
len(attachs)])
reactor.addSystemEventTrigger('before', 'shutdown', lambda: dfd)
return dfd
def _get_telnet_vars(self):
# Note: if you add entries here also update topics/telnetconsole.rst
telnet_vars = {
'engine': scrapymanager.engine,
'manager': scrapymanager,
'extensions': extensions,
'stats': stats,
'spiders': spiders,
'settings': settings,
'est': print_engine_status,
'p': pprint.pprint,
'prefs': print_live_refs,
'hpy': hpy,
}
send_catch_log(update_telnet_vars, telnet_vars=telnet_vars)
return telnet_vars
def test_send_catch_log(self):
handlers_called = set()
def test_handler_error(arg):
handlers_called.add(test_handler_error)
a = 1/0
def test_handler_check(arg):
handlers_called.add(test_handler_check)
assert arg == 'test'
return "OK"
def log_received(message, level):
handlers_called.add(log_received)
assert "test_handler_error" in message
assert level == log.ERROR
dispatcher.connect(log_received, signal=log.logmessage_received)
dispatcher.connect(test_handler_error, signal=test_signal)
dispatcher.connect(test_handler_check, signal=test_signal)
result = send_catch_log(test_signal, arg='test')
assert test_handler_error in handlers_called
assert test_handler_check in handlers_called
assert log_received in handlers_called
self.assertEqual(result[0][0], test_handler_error)
self.assert_(isinstance(result[0][1], Exception))
self.assertEqual(result[1], (test_handler_check, "OK"))
dispatcher.disconnect(log_received, signal=log.logmessage_received)
dispatcher.disconnect(test_handler_error, signal=test_signal)
dispatcher.disconnect(test_handler_check, signal=test_signal)
def _finish_closing_spider(self, spider):
"""This function is called after the spider has been closed"""
reason = self.closing.pop(spider, 'finished')
send_catch_log(signal=signals.spider_closed, sender=self.__class__, \
spider=spider, reason=reason)
call = self._next_request_calls.pop(spider, None)
if call and call.active():
call.cancel()
dfd = defer.maybeDeferred(stats.close_spider, spider, reason=reason)
dfd.addErrback(log.err, "Unhandled error in stats.close_spider()",
spider=spider)
dfd.addBoth(lambda _: spiders.close_spider(spider))
dfd.addErrback(log.err, "Unhandled error in spiders.close_spider()",
spider=spider)
dfd.addBoth(lambda _: log.msg("Spider closed (%s)" % reason, spider=spider))
dfd.addBoth(lambda _: self._spider_closed_callback(spider))
return dfd
def process_response(response):
assert response is not None, 'Received None in process_response'
if isinstance(response, Request):
return response
for method in self.response_middleware:
response = method(request=request, response=response, spider=spider)
assert isinstance(response, (Response, Request)), \
'Middleware %s.process_response must return Response or Request, got %s' % \
(method.im_self.__class__.__name__, type(response))
if isinstance(response, Request):
send_catch_log(signal=signals.response_received, \
sender=self.__class__, response=response, spider=spider)
return response
send_catch_log(signal=signals.response_received, sender=self.__class__, \
response=response, spider=spider)
return response
def _itemproc_finished(self, output, item, spider):
"""ItemProcessor finished for the given ``item`` and returned ``output``
"""
self.sites[spider].itemproc_size -= 1
if isinstance(output, Failure):
ex = output.value
if isinstance(ex, DropItem):
log.msg("Dropped %s - %s" % (item, str(ex)), level=log.WARNING, spider=spider)
send_catch_log(signal=signals.item_dropped, sender=self.__class__, \
item=item, spider=spider, exception=output.value)
else:
log.msg('Error processing %s - %s' % (item, output), \
log.ERROR, spider=spider)
else:
log.msg("Passed %s" % item, log.INFO, spider=spider)
send_catch_log(signal=signals.item_passed, sender=self.__class__, \
item=item, spider=spider, output=output)
def _process_spidermw_output(self, output, request, response, spider):
"""Process each Request/Item (given in the output parameter) returned
from the given spider
"""
if isinstance(output, Request):
send_catch_log(signal=signals.request_received, request=output, \
spider=spider)
self.crawler.engine.crawl(request=output, spider=spider)
elif isinstance(output, BaseItem):
self.slots[spider].itemproc_size += 1
dfd = self.itemproc.process_item(output, spider)
dfd.addBoth(self._itemproc_finished, output, response, spider)
return dfd
elif output is None:
pass
else:
log.msg("Spider must return Request, BaseItem or None, got %r in %s" % \
(type(output).__name__, request), log.ERROR, spider=spider)
def send_catch_log(self, signal, **kwargs):
"""
Send a signal, catch exceptions and log them.
The keyword arguments are passed to the signal handlers (connected
through the :meth:`connect` method).
"""
kwargs.setdefault('sender', self.sender)
return _signal.send_catch_log(signal, **kwargs)
def _get_telnet_vars(self):
# Note: if you add entries here also update topics/telnetconsole.rst
telnet_vars = {
'engine': crawler.engine,
'manager': crawler,
'extensions': crawler.extensions,
'stats': stats,
'spiders': crawler.spiders,
'settings': settings,
'est': print_engine_status,
'p': pprint.pprint,
'prefs': print_live_refs,
'hpy': hpy,
'help': "This is Scrapy telnet console. For more info see: " \
"http://doc.scrapy.org/topics/telnetconsole.html", # see #284
}
send_catch_log(update_telnet_vars, telnet_vars=telnet_vars)
return telnet_vars
def send_catch_log(self, signal, **kwargs):
"""
Send a signal, catch exceptions and log them.
The keyword arguments are passed to the signal handlers (connected
through the :meth:`connect` method).
"""
kwargs.setdefault('sender', self.sender)
return _signal.send_catch_log(signal, **kwargs)
def send(self, to, subject, body, cc=None, attachs=()):
if attachs:
msg = MIMEMultipart()
else:
msg = MIMENonMultipart('text', 'plain')
msg['From'] = self.mailfrom
msg['To'] = COMMASPACE.join(to)
msg['Date'] = formatdate(localtime=True)
msg['Subject'] = subject
rcpts = to[:]
if cc:
rcpts.extend(cc)
msg['Cc'] = COMMASPACE.join(cc)
if attachs:
msg.attach(MIMEText(body))
for attach_name, mimetype, f in attachs:
part = MIMEBase(*mimetype.split('/'))
part.set_payload(f.read())
Encoders.encode_base64(part)
part.add_header('Content-Disposition', 'attachment; filename="%s"' \
% attach_name)
msg.attach(part)
else:
msg.set_payload(body)
send_catch_log(signal=mail_sent, to=to, subject=subject, body=body,
cc=cc, attach=attachs, msg=msg)
if settings.getbool('MAIL_DEBUG'):
log.msg('Debug mail sent OK: To=%s Cc=%s Subject="%s" Attachs=%d' % \
(to, cc, subject, len(attachs)), level=log.DEBUG)
return
dfd = self._sendmail(rcpts, msg.as_string())
dfd.addCallbacks(self._sent_ok, self._sent_failed,
callbackArgs=[to, cc, subject, len(attachs)],
errbackArgs=[to, cc, subject, len(attachs)])
reactor.addSystemEventTrigger('before', 'shutdown', lambda: dfd)
return dfd
def put(self, url, name, cat, price, collection_name=None):
uid = get_uid(url)
domain = get_domain(url)
crawl_time = int(time.time())
item = self.get(url, collection_name)
if item:
if item.add_price(price, crawl_time):
self.dbclient.update_field(uid, collection_name,
data=item.data,
bottom_price=item.bottom_price)
else:
log.msg('duplicate price')
return
else:
item = { "url":url, 'uid': uid, "name":name,
"cat":cat, "data":[(price, crawl_time)],
"bottom_price":(price, crawl_time),
"domain":domain
}
self.dbclient.insert(item, uid, collection_name)
send_catch_log(signal=signals.item_saved, item=item)
def _process_spidermw_output(self, output, request, response, spider):
"""Process each Request/Item (given in the output parameter) returned
from the given spider
"""
if isinstance(output, Request):
send_catch_log(signal=signals.request_received, request=output, \
spider=spider)
self.engine.crawl(request=output, spider=spider)
elif isinstance(output, BaseItem):
log.msg(log.formatter.scraped(output, request, response, spider), \
level=log.DEBUG, spider=spider)
self.sites[spider].itemproc_size += 1
dfd = send_catch_log_deferred(signal=signals.item_scraped, \
item=output, spider=spider, response=response)
dfd.addBoth(lambda _: self.itemproc.process_item(output, spider))
dfd.addBoth(self._itemproc_finished, output, spider)
return dfd
elif output is None:
pass
else:
log.msg("Spider must return Request, BaseItem or None, got %r in %s" % \
(type(output).__name__, request), log.ERROR, spider=spider)
def _process_spidermw_output(self, output, request, response, spider):
"""Process each Request/Item (given in the output parameter) returned
from the given spider
"""
if isinstance(output, Request):
send_catch_log(signal=signals.request_received, request=output, \
spider=spider)
self.engine.crawl(request=output, spider=spider)
elif isinstance(output, BaseItem):
log.msg(log.formatter.scraped(output, request, response, spider), \
level=log.DEBUG, spider=spider)
self.sites[spider].itemproc_size += 1
dfd = send_catch_log_deferred(signal=signals.item_scraped, \
item=output, spider=spider, response=response)
dfd.addBoth(lambda _: self.itemproc.process_item(output, spider))
dfd.addBoth(self._itemproc_finished, output, spider)
return dfd
elif output is None:
pass
else:
log.msg("Spider must return Request, BaseItem or None, got %r in %s" % \
(type(output).__name__, request), log.ERROR, spider=spider)
def _get_telnet_vars(self):
# Note: if you add entries here also update topics/telnetconsole.rst
slots = self.crawler.engine.slots
if len(slots) == 1:
spider, slot = slots.items()[0]
telnet_vars = {
'engine': self.crawler.engine,
'spider': spider,
'slot': slot,
'manager': self.crawler,
'extensions': self.crawler.extensions,
'stats': stats,
'spiders': self.crawler.spiders,
'settings': self.crawler.settings,
'est': lambda: print_engine_status(self.crawler.engine),
'p': pprint.pprint,
'prefs': print_live_refs,
'hpy': hpy,
'help': "This is Scrapy telnet console. For more info see: " \
"http://doc.scrapy.org/en/latest/topics/telnetconsole.html",
}
send_catch_log(update_telnet_vars, telnet_vars=telnet_vars)
return telnet_vars
def _spider_idle(self, spider):
"""Called when a spider gets idle. This function is called when there
are no remaining pages to download or schedule. It can be called
multiple times. If some extension raises a DontCloseSpider exception
(in the spider_idle signal handler) the spider is not closed until the
next loop and this function is guaranteed to be called (at least) once
again for this spider.
"""
res = send_catch_log(signal=signals.spider_idle, spider=spider, dont_log=DontCloseSpider)
if any(isinstance(x, Failure) and isinstance(x.value, DontCloseSpider) for _, x in res):
reactor.callLater(5, self.next_request, spider)
return
if self.spider_is_idle(spider):
self.close_spider(spider, reason="finished")
def _spider_idle(self, spider):
"""Called when a spider gets idle. This function is called when there
are no remaining pages to download or schedule. It can be called
multiple times. If some extension raises a DontCloseSpider exception
(in the spider_idle signal handler) the spider is not closed until the
next loop and this function is guaranteed to be called (at least) once
again for this spider.
"""
res = send_catch_log(signal=signals.spider_idle, \
spider=spider, dont_log=DontCloseSpider)
if any(isinstance(x, Failure) and isinstance(x.value, DontCloseSpider) \
for _, x in res):
self.slots[spider].nextcall.schedule(5)
return
if self.spider_is_idle(spider):
self.close_spider(spider, reason='finished')
def _downloaded(response):
send_catch_log(signal=signals.response_downloaded, \
response=response, request=request, spider=spider)
return response
def _deactivate(response):
send_catch_log(signal=signals.response_received, \
response=response, request=request, spider=spider)
site.active.remove(request)
self._close_if_idle(spider)
return response
def _get_result(self, signal, *a, **kw):
return send_catch_log(signal, *a, **kw)
def _get_result(self, signal, *a, **kw):
return send_catch_log(signal, *a, **kw)
def send_catch_log(self, *a, **kw):
kw.setdefault('sender', self.sender)
return signal.send_catch_log(*a, **kw)
def open_spider(self, spider):
self._stats[spider] = {}
send_catch_log(stats_spider_opened, spider=spider)
def open_spider(self, spider):
self._stats[spider] = {}
send_catch_log(stats_spider_opened, spider=spider)
def _downloaded(response):
send_catch_log(signal=signals.response_downloaded, \
response=response, request=request, spider=spider)
return response