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我运行这段代码:
import argparse
from tqdm import tqdm
from sys import argv
from pprint import pformat
from twisted.internet.task import react
from twisted.web.client import Agent, readBody
from twisted.web.http_headers import Headers
from twisted.internet.task import cooperate
from twisted.internet.defer import gatherResults
import sys
from twisted.python import log
log.startLogging(sys.stdout)
import lxml.html
from geoip import geolite2
import pycountry
from tld import get_tld
import json
import socket
poweredby = ""
server = ""
ip = ""
f = open("errors.txt", "w")
def error(response, url):
f.write("Error: "+url+"\n")
def cbRequest(response, url):
global poweredby, server, ip
# print 'Response version:', response.version
# print 'Response code:', response.code
# print 'Response phrase:', response.phrase
# print 'Response headers:'
# print pformat(list(response.headers.getAllRawHeaders()))
poweredby = response.headers.getRawHeaders("X-Powered-By")[0]
server = response.headers.getRawHeaders("Server")[0]
#print poweredby
#print server
d = readBody(response)
d.addCallback(cbBody, url)
return d
def cbBody(body, ourl):
global poweredby, server,ip
#print body
html_element = lxml.html.fromstring(body)
generator = html_element.xpath("//meta[@name='generator']/@content")
ip = socket.gethostbyname(ourl)
try:
match = geolite2.lookup(ip)
if match is not None:
country = match.country
try:
c = pycountry.countries.lookup(country)
country = c.name
except:
country = ""
except:
country = ""
try:
res = get_tld("http://www" + ourl, as_object=True)
tld = res.suffix
except:
tld = ""
try:
match = re.search(r'[\w\.-]+@[\w\.-]+', body)
email = match.group(0)
except:
email = ""
permalink=ourl.rstrip().replace(".","-")
try:
item = generator[0]
val = "{ \"Domain\":" + json.dumps(
"http://" + ourl.rstrip()) + ",\"IP\":\"" + ip + "\",\"Server\":" + json.dumps(
str(server)) + ",\"PoweredBy\":" + json.dumps(
str(poweredby)) + ",\"MetaGenerator\":" + json.dumps(item) + ",\"Email\":" + json.dumps(
email) + ",\"Suffix\":\"" + tld + "\",\"CountryHosted\":\"" + country+"\",\"permalink\":\""+permalink+"\" }"
except:
val = "{ \"Domain\":" + json.dumps(
"http://" + ourl.rstrip()) + ",\"IP\":\"" + ip + "\"," + "\"Server\":" + json.dumps(
str(server)) + ",\"PoweredBy\":" + json.dumps(
str(poweredby)) + ",\"MetaGenerator\":\"\",\"Email\":" + json.dumps(
email) + ",\"Suffix\":\"" + tld + "\",\"CountryHosted\":\"" + country+"\",\"permalink\":\""+permalink+"\" }"
print val
def main(reactor, url_path):
urls = open(url_path)
return mainjob(reactor, (url.strip() for url in urls))
def mainjob(reactor, urls=argv[2:]):
#for url in urls:
# print url
agent = Agent(reactor)
work = (process(agent, url) for url in tqdm(urls))
tasks = list(cooperate(work) for i in range(100))
return gatherResults(list(task.whenDone() for task in tasks))
def process(agent, url):
d = agent.request(
'GET', "http://" + url,
Headers({'User-Agent': ['crawler']}),
None)
d.debug=1
d.addCallback(cbRequest, url)
d.addErrback(error, url)
return d
react(main, ["./test.txt"])
f.close()
我启用了调试,并且以某种方式对于这 2 个条目 addErrback 总是被调用(4 次尝试中的 4 次),因此错误条目:
user@laptop:~/crawler$ python scanner.py
2017-02-25 20:35:36+0100 [-] Log opened.
0it [00:00, ?it/s]2017-02-25 20:35:36+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1248>
2017-02-25 20:35:36+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac16c8>
2it [00:00, 660.31it/s]
2017-02-25 20:35:37+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1248>
2017-02-25 20:35:37+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac16c8>
2017-02-25 20:35:37+0100 [-] Main loop terminated.
user@laptop:~/crawler$ cat errors.txt
Error: google.al
Error: fau.edu.al
我很困惑,因为在捕获时,我看到这些请求已发出并收到了响应。
如何在 addErrback() 中打印确切的错误原因以更多地了解行为?
这与这个问题相关:
Twisted/Python - processing a large file line by line
我很感激任何帮助。 Python 和 Twisted 新手。
谢谢
更新1:
我将错误函数修改为:
def error(failure, url):
f.write("Error: "+url+"\n")
print type(failure.value), failure # catch error here
print failure.value.reasons[0].printTraceback()
这是输出,每次运行似乎都是相同的:
user@laptop:~/crawler$ python scanner.py
2017-02-25 21:24:48+0100 [-] Log opened.
0it [00:00, ?it/s]2017-02-25 21:24:48+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1200>
2017-02-25 21:24:48+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1680>
2it [00:00, 788.33it/s]
2017-02-25 21:24:48+0100 [-] <type 'exceptions.TypeError'> [Failure instance: Traceback: <type 'exceptions.TypeError'>: 'NoneType' object has no attribute '__getitem__'
2017-02-25 21:24:48+0100 [-] /usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:565:_startRunCallbacks
2017-02-25 21:24:48+0100 [-] /usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:651:_runCallbacks
2017-02-25 21:24:48+0100 [-] /usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:457:callback
2017-02-25 21:24:48+0100 [-] /usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:565:_startRunCallbacks
2017-02-25 21:24:48+0100 [-] --- <exception caught here> ---
2017-02-25 21:24:48+0100 [-] /usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:651:_runCallbacks
2017-02-25 21:24:48+0100 [-] scanner.py:47:cbRequest
2017-02-25 21:24:48+0100 [-] ]
2017-02-25 21:24:48+0100 [HTTP11ClientProtocol,client] main function encountered error
Traceback (most recent call last):
Failure: twisted.internet.defer.FirstError: FirstError[#0, [Failure instance: Traceback: <type 'exceptions.AttributeError'>: 'exceptions.TypeError' object has no attribute 'reasons'
/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:565:_startRunCallbacks
/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:651:_runCallbacks
/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:457:callback
/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:565:_startRunCallbacks
--- <exception caught here> ---
/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py:651:_runCallbacks
scanner.py:37:error
]]
2017-02-25 21:24:48+0100 [-] <class 'twisted.internet.error.ConnectError'> [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectError'>: An error occurred while connecting: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion: Connection lost.
2017-02-25 21:24:48+0100 [-] ].
2017-02-25 21:24:48+0100 [-] ]
2017-02-25 21:24:48+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1680>
2017-02-25 21:24:48+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac1200>
2017-02-25 21:24:48+0100 [-] Main loop terminated.
2017-02-25 21:24:48+0100 [-] Unhandled error in Deferred:
2017-02-25 21:24:48+0100 [-] Unhandled Error
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/base.py", line 1084, in connectionFailed
self.factory.clientConnectionFailed(self, reason)
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 246, in clientConnectionFailed
self._onConnection.errback(reason)
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 498, in errback
self._startRunCallbacks(fail)
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
self._runCallbacks()
--- <exception caught here> ---
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "scanner.py", line 37, in error
print failure.value.reasons[0].printTraceback()
exceptions.AttributeError: 'ConnectError' object has no attribute 'reasons'
2017-02-25 21:24:48+0100 [-] Unhandled error in Deferred:
2017-02-25 21:24:48+0100 [-] Unhandled Error
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
self._runCallbacks()
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 457, in callback
self._startRunCallbacks(result)
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
self._runCallbacks()
--- <exception caught here> ---
File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
current.result = callback(current.result, *args, **kw)
File "scanner.py", line 37, in error
print failure.value.reasons[0].printTraceback()
exceptions.AttributeError: 'exceptions.TypeError' object has no attribute 'reasons'
更新2:
将错误函数修改为@Jean-Paul Calderone 给出的示例后
我得到这个输出:
2017-02-27 17:46:57+0100 [-] Log opened.
0it [00:00, ?it/s]2017-02-27 17:46:57+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac0320>
2017-02-27 17:46:57+0100 [-] Starting factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac07a0>
2it [00:00, 763.36it/s]
2017-02-27 17:46:57+0100 [-] Traceback (most recent call last):
2017-02-27 17:46:57+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
2017-02-27 17:46:57+0100 [-] self._runCallbacks()
2017-02-27 17:46:57+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
2017-02-27 17:46:57+0100 [-] current.result = callback(current.result, *args, **kw)
2017-02-27 17:46:57+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 457, in callback
2017-02-27 17:46:57+0100 [-] self._startRunCallbacks(result)
2017-02-27 17:46:57+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
2017-02-27 17:46:57+0100 [-] self._runCallbacks()
2017-02-27 17:46:57+0100 [-] --- <exception caught here> ---
2017-02-27 17:46:57+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
2017-02-27 17:46:57+0100 [-] current.result = callback(current.result, *args, **kw)
2017-02-27 17:46:57+0100 [-] File "scan.py", line 59, in cbRequest
2017-02-27 17:46:57+0100 [-] poweredby = response.headers.getRawHeaders("X-Powered-By")[0]
2017-02-27 17:46:57+0100 [-] exceptions.TypeError: 'NoneType' object has no attribute '__getitem__'
2017-02-27 17:46:57+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac0320>
2017-02-27 17:46:59+0100 [-] Traceback (most recent call last):
2017-02-27 17:46:59+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
2017-02-27 17:46:59+0100 [-] self._runCallbacks()
2017-02-27 17:46:59+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
2017-02-27 17:46:59+0100 [-] current.result = callback(current.result, *args, **kw)
2017-02-27 17:46:59+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 457, in callback
2017-02-27 17:46:59+0100 [-] self._startRunCallbacks(result)
2017-02-27 17:46:59+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 565, in _startRunCallbacks
2017-02-27 17:46:59+0100 [-] self._runCallbacks()
2017-02-27 17:46:59+0100 [-] --- <exception caught here> ---
2017-02-27 17:46:59+0100 [-] File "/usr/local/lib/python2.7/dist-packages/twisted/internet/defer.py", line 651, in _runCallbacks
2017-02-27 17:46:59+0100 [-] current.result = callback(current.result, *args, **kw)
2017-02-27 17:46:59+0100 [-] File "scan.py", line 59, in cbRequest
2017-02-27 17:46:59+0100 [-] poweredby = response.headers.getRawHeaders("X-Powered-By")[0]
2017-02-27 17:46:59+0100 [-] exceptions.TypeError: 'NoneType' object has no attribute '__getitem__'
2017-02-27 17:46:59+0100 [-] Stopping factory <twisted.web.client._HTTP11ClientFactory instance at 0x7fffefac07a0>
2017-02-27 17:46:59+0100 [-] Main loop terminated.
正如您所看到的,它提示响应是 NoneType 对象,因此没有提到真正的原因。
但是,当我运行旧版本的错误函数时,它会打印您在更新 1 中看到的内容:
<class 'twisted.internet.error.ConnectError'> [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectError'>: An error occurred while connecting: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion: Connection lost.
为什么它不在第一个版本中打印它(@Jean-Paul Calderone 建议的答案)?为什么它通常会出现此错误?
我验证了当我连接到这些域时它可以工作,也可以通过爬虫程序的线程版本(也在Python中)工作,正如你所看到的,它也在网络上(Wireshark屏幕截图)。看起来 Twisted 没有看到它(将其视为丢失的连接?)
最佳答案
您的 error
函数中存在错误。回溯告诉你这一点:
File "scanner.py", line 37, in error
print failure.value.reasons[0].printTraceback()
exceptions.AttributeError: 'exceptions.TypeError' object has no attribute 'reasons'
scanner.py,第 37 行,在名为 error
的函数中,print failure.value.reasons[0].printTraceback()
行引发了 AttributeError
因为 TypeError
实例没有 reasons
属性。
我认为您正在查找的reasons
属性属于RequestGenerationFailed
、RequestTransmissionFailed
或ResponseFailed
。
因此,像这样定义error
:
from twisted.web._newclient import (
RequestGenerationFailed,
RequestTransmissionFailed,
ResponseFailed,
)
def error(failure, url):
f.write("Error: "+url+"\n")
if failure.check(
RequestGenerationFailed,
RequestTransmissionFailed,
ResponseFailed,
):
failure.value.reasons[0].printTraceback()
else:
failure.printTraceback()
如果这证明有用,请向 Twisted 提交一张票证,以将这些异常类型公开(因为无法保证 _newclient
导入将来会继续有效) .
关于Python/Twisted - 如何打印更详细的错误消息,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42460779/
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