我正在使用DryScrape来抓取javascript页面,如果出现错误,偶尔它会杀死进程。我尝试根据文档使用捕获来防止它,但我还没有弄清楚:
try:
sess.visit('url'))
except webkit_server.EndOfStreamError:
continue
except webkit_server.NoResponeerror:
continue
except webkit_server.InvalidResponseError:
continue
except webkit_server.NoX11Error:
continue
所以我有这样的设置,如果线程崩溃,我会重新启动线程:类检查器(): def check_if_thread_is_alive(个体经营): a = 线程类() a.start()
b = ThreadClass()
b.start()
c = ThreadClass()
c.start()
d = ThreadClass()
d.start()
while True:
if not a.is_alive():
print "Restarting A"
a = ThreadClass()
a.start()
if not b.is_alive():
print "Restarting B"
b = ThreadClass()
b.start()
if not c.is_alive():
print "Restarting C"
c = ThreadClass()
c.start()
if not d.is_alive():
print "Restarting D"
d = ThreadClass()
d.start()
但是,每当我尝试重新启动线程时,我最终都会收到错误:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "Scrapper.py", line 30, in run
sess = dryscrape.Session(base_url = 'url')
File "/usr/local/lib/python2.7/dist-packages/dryscrape/session.py", line 18, in __init__
self.driver = driver or DefaultDriver()
File "/usr/local/lib/python2.7/dist-packages/dryscrape/driver/webkit.py", line 30, in __init__
super(Driver, self).__init__(**kw)
File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 225, in __init__
self.conn = connection or ServerConnection()
File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 444, in __init__
self._sock = (server or get_default_server()).connect()
File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 414, in connect
sock.connect(("127.0.0.1", self._port))
File "/usr/lib/python2.7/socket.py", line 224, in meth
return getattr(self._sock,name)(*args)
error: [Errno 111] Connection refused
有没有更好的方法来尝试解决这个问题,或者我缺少什么?
Cos :你正在尝试连接到自己。
need change target url.
如果要连接到自己,请先创建服务。
File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 414, in connect
sock.connect(("127.0.0.1", self._port))
File "/usr/lib/python2.7/socket.py", line 224, in meth <<<--- you're trying to connect to yourself.
return getattr(self._sock,name)(*args)
如果要跳过异常,始终可以使用像这样的 catch-all 异常处理程序。这通常被认为是非常糟糕的做法,但如果错误只是偶尔发生,它确实可以让您的刮板保持运行:
try:
sess.visit(url)
except Exception as e:
# Print the exception for debugging here
continue
您是否正在启动本地服务器进行测试?从回溯:
File "/usr/local/lib/python2.7/dist-packages/webkit_server.py", line 414, in connect
sock.connect(("127.0.0.1", self._port))
您实际上是在连接到本地主机。如果启动自己的服务器,请检查服务器日志以了解它停止响应连接请求的原因。
刚刚在您的脚本中发现了另一个错误:
sess.visit('url')
# it should be something like:
url = "http://www.google.com/"
sess.visit(url)