ERROR: Error downloading <GET URL_HERE>: User timeout caused connection failure.
Ottengo questo problema ogni tanto quando si utilizza il mio raschietto. C'è un modo per prendere questo problema ed eseguire una funzione quando succede? Non riesco a scoprire come farlo online ovunque.Come posso rilevare gli errori con scrapy così posso fare qualcosa quando ottengo l'errore Timeout utente?
Che cosa si può fare è definire una errback nelle Request casi:
errback (callable) - una funzione che verrà chiamata se nessuna eccezione è stata sollevata durante l'elaborazione della richiesta. Ciò include pagine che hanno fallito con 404 errori HTTP e così via. Riceve a Twisted Failure instance come primo parametro.
Ecco alcuni esempi di codice (per Scrapy 1.0) che è possibile utilizzare:
# -*- coding: utf-8 -*-
# errbacks.py
import scrapy
# from scrapy.contrib.spidermiddleware.httperror import HttpError
from scrapy.spidermiddlewares.httperror import HttpError
from twisted.internet.error import DNSLookupError
from twisted.internet.error import TimeoutError
class ErrbackSpider(scrapy.Spider):
name = "errbacks"
start_urls = [
"http://www.httpbin.org/", # HTTP 200 expected
"http://www.httpbin.org/status/404", # Not found error
"http://www.httpbin.org/status/500", # server issue
"http://www.httpbin.org:12345/", # non-responding host, timeout expected
"http://www.httphttpbinbin.org/", # DNS error expected
]
def start_requests(self):
for u in self.start_urls:
yield scrapy.Request(u, callback=self.parse_httpbin,
errback=self.errback_httpbin,
dont_filter=True)
def parse_httpbin(self, response):
self.logger.error('Got successful response from {}'.format(response.url))
# do something useful now
def errback_httpbin(self, failure):
# log all errback failures,
# in case you want to do something special for some errors,
# you may need the failure's type
self.logger.error(repr(failure))
#if isinstance(failure.value, HttpError):
if failure.check(HttpError):
# you can get the response
response = failure.value.response
self.logger.error('HttpError on %s', response.url)
#elif isinstance(failure.value, DNSLookupError):
elif failure.check(DNSLookupError):
# this is the original request
request = failure.request
self.logger.error('DNSLookupError on %s', request.url)
#elif isinstance(failure.value, TimeoutError):
elif failure.check(TimeoutError):
request = failure.request
self.logger.error('TimeoutError on %s', request.url)
E l'uscita in guscio Scrapy (solo 1 tentativi e 5s scaricare timeout):
$ scrapy runspider errbacks.py --set DOWNLOAD_TIMEOUT=5 --set RETRY_TIMES=1
2015-06-30 23:45:55 [scrapy] INFO: Scrapy 1.0.0 started (bot: scrapybot)
2015-06-30 23:45:55 [scrapy] INFO: Optional features available: ssl, http11
2015-06-30 23:45:55 [scrapy] INFO: Overridden settings: {'DOWNLOAD_TIMEOUT': '5', 'RETRY_TIMES': '1'}
2015-06-30 23:45:56 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2015-06-30 23:45:56 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-06-30 23:45:56 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-06-30 23:45:56 [scrapy] INFO: Enabled item pipelines:
2015-06-30 23:45:56 [scrapy] INFO: Spider opened
2015-06-30 23:45:56 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-06-30 23:45:56 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2015-06-30 23:45:56 [scrapy] DEBUG: Retrying <GET http://www.httphttpbinbin.org/> (failed 1 times): DNS lookup failed: address 'www.httphttpbinbin.org' not found: [Errno -5] No address associated with hostname.
2015-06-30 23:45:56 [scrapy] DEBUG: Gave up retrying <GET http://www.httphttpbinbin.org/> (failed 2 times): DNS lookup failed: address 'www.httphttpbinbin.org' not found: [Errno -5] No address associated with hostname.
2015-06-30 23:45:56 [errbacks] ERROR: <twisted.python.failure.Failure <class 'twisted.internet.error.DNSLookupError'>>
2015-06-30 23:45:56 [errbacks] ERROR: DNSLookupError on http://www.httphttpbinbin.org/
2015-06-30 23:45:56 [scrapy] DEBUG: Crawled (200) <GET http://www.httpbin.org/> (referer: None)
2015-06-30 23:45:56 [scrapy] DEBUG: Crawled (404) <GET http://www.httpbin.org/status/404> (referer: None)
2015-06-30 23:45:56 [errbacks] ERROR: Got successful response from http://www.httpbin.org/
2015-06-30 23:45:56 [errbacks] ERROR: <twisted.python.failure.Failure <class 'scrapy.spidermiddlewares.httperror.HttpError'>>
2015-06-30 23:45:56 [errbacks] ERROR: HttpError on http://www.httpbin.org/status/404
2015-06-30 23:45:56 [scrapy] DEBUG: Retrying <GET http://www.httpbin.org/status/500> (failed 1 times): 500 Internal Server Error
2015-06-30 23:45:57 [scrapy] DEBUG: Gave up retrying <GET http://www.httpbin.org/status/500> (failed 2 times): 500 Internal Server Error
2015-06-30 23:45:57 [scrapy] DEBUG: Crawled (500) <GET http://www.httpbin.org/status/500> (referer: None)
2015-06-30 23:45:57 [errbacks] ERROR: <twisted.python.failure.Failure <class 'scrapy.spidermiddlewares.httperror.HttpError'>>
2015-06-30 23:45:57 [errbacks] ERROR: HttpError on http://www.httpbin.org/status/500
2015-06-30 23:46:01 [scrapy] DEBUG: Retrying <GET http://www.httpbin.org:12345/> (failed 1 times): User timeout caused connection failure.
2015-06-30 23:46:06 [scrapy] DEBUG: Gave up retrying <GET http://www.httpbin.org:12345/> (failed 2 times): User timeout caused connection failure.
2015-06-30 23:46:06 [errbacks] ERROR: <twisted.python.failure.Failure <class 'twisted.internet.error.TimeoutError'>>
2015-06-30 23:46:06 [errbacks] ERROR: TimeoutError on http://www.httpbin.org:12345/
2015-06-30 23:46:06 [scrapy] INFO: Closing spider (finished)
2015-06-30 23:46:06 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 4,
'downloader/exception_type_count/twisted.internet.error.DNSLookupError': 2,
'downloader/exception_type_count/twisted.internet.error.TimeoutError': 2,
'downloader/request_bytes': 1748,
'downloader/request_count': 8,
'downloader/request_method_count/GET': 8,
'downloader/response_bytes': 12506,
'downloader/response_count': 4,
'downloader/response_status_count/200': 1,
'downloader/response_status_count/404': 1,
'downloader/response_status_count/500': 2,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2015, 6, 30, 21, 46, 6, 537191),
'log_count/DEBUG': 10,
'log_count/ERROR': 9,
'log_count/INFO': 7,
'response_received_count': 3,
'scheduler/dequeued': 8,
'scheduler/dequeued/memory': 8,
'scheduler/enqueued': 8,
'scheduler/enqueued/memory': 8,
'start_time': datetime.datetime(2015, 6, 30, 21, 45, 56, 322235)}
2015-06-30 23:46:06 [scrapy] INFO: Spider closed (finished)
Nota come scrapy registra le eccezioni nelle sue statistiche:
'downloader/exception_type_count/twisted.internet.error.DNSLookupError': 2,
'downloader/exception_type_count/twisted.internet.error.TimeoutError': 2,
Preferisco avere un Retry Middleware personalizzato come questo:
from scrapy.contrib.downloadermiddleware.retry import RetryMiddleware
from fake_useragent import FakeUserAgentError
class FakeUserAgentErrorRetryMiddleware(RetryMiddleware):
def process_exception(self, request, exception, spider):
if type(exception) == FakeUserAgentError: return self._retry(request, exception, spider)