特威比SSLE

Question

我有一个Django管理命令，通过supervisord启动，它使用tweepy来使用twitter流API。

代理运行得很好，但是我注意到日志中每10-15分钟有一个SSLError，并且supervisord正在重新启动代理。

tweepy软件包是最新的，版本1.11。服务器是Ubuntu12.04LTS。我已经试过将cacert安装到下面链接中提到的密钥链中，但是没有成功。

Twitter API SSL Root CA Certificate

有什么建议吗？

[2012-08-26 19:28:15,656: ERROR] Error establishing the connection
Traceback (most recent call last):.../.../datasinks.py", line 102, in start
    stream.filter(locations=self.locations)
  File "/site/pythonenv/local/lib/python2.7/site-packages/tweepy/streaming.py", line 228, in filter
    self._start(async)
  File "/site/pythonenv/local/lib/python2.7/site-packages/tweepy/streaming.py", line 172, in _start
    self._run()
  File "/site/pythonenv/local/lib/python2.7/site-packages/tweepy/streaming.py", line 117, in _run
    self._read_loop(resp)
  File "/site/pythonenv/local/lib/python2.7/site-packages/tweepy/streaming.py", line 150, in _read_loop
    c = resp.read(1)
  File "/usr/lib/python2.7/httplib.py", line 541, in read
    return self._read_chunked(amt)
  File "/usr/lib/python2.7/httplib.py", line 574, in _read_chunked
    line = self.fp.readline(_MAXLINE + 1)
  File "/usr/lib/python2.7/socket.py", line 476, in readline
    data = self._sock.recv(self._rbufsize)
  File "/usr/lib/python2.7/ssl.py", line 241, in recv
    return self.read(buflen)
  File "/usr/lib/python2.7/ssl.py", line 160, in read
  return self._sslobj.read(len)
SSLError: The read operation timed out

下面是代码的概要。

from tweepy import API, OAuthHandler
from tweepy.streaming import StreamListener, Stream
# snip other imports

class TwitterSink(StreamListener, TweetSink):

  def __init__(self):
    self.auth = OAuthHandler(settings.TWITTER_OAUTH_CONSUMER_KEY, settings.TWITTER_OAUTH_CONSUMER_SECRET)
    self.auth.set_access_token(settings.TWITTER_OAUTH_ACCESS_TOKEN_KEY, settings.TWITTER_OAUTH_ACCESS_TOKEN_SECRET)
    self.locations = '' # Snip for brevity

  def start(self):
    try:
        stream = Stream(self.auth, self,timeout=60, secure=True)
        stream.filter(locations=self.locations)
    except SSLError as e:
        logger.exception("Error establishing the connection")
    except IncompleteRead as r:
        logger.exception("Error with HTTP connection")

  # snip on_data()
  # snip on_timeout()
  # snip on_error()

Answer 1

Github上提供了另一种替代解决方案：

https://github.com/tweepy/tweepy/pull/132

Answer 2

这是我的方法（从这里修改的解决方案https://groups.google.com/forum/?fromgroups=#!topic/tweepy/80Ayu1joGJ4）：

l = MyListener()
auth = OAuthHandler(settings.CONSUMER_KEY, settings.CONSUMER_SECRET)
auth.set_access_token(settings.ACCESS_TOKEN, settings.ACCESS_TOKEN_SECRET)
# connect to stream
stream = Stream(auth, l, timeout=30.0)
while True:
    # Call tweepy's userstream method with async=False to prevent
    # creation of another thread.
    try:
        stream.filter(follow=reporters, async=False)
         # Normal exit: end the thread
         break
    except Exception, e:
         # Abnormal exit: Reconnect
         logger.error(e)
         nsecs = random.randint(60, 63)
         logger.error('{0}: reconnect in {1} seconds.'.format(
             datetime.datetime.utcnow(), nsecs))
         time.sleep(nsecs)

Answer 3

证书似乎不是问题所在。这个错误只是一个超时。我觉得tweepy的SSL处理有问题。The code可以处理socket.timeout并重新打开连接，但不是通过SSLError到达的超时。

不过，看看ssl模块code（或docs），我看不出一个很好的方法来捕捉它。SSLError对象没有任何参数，只是一个字符串描述。由于缺乏更好的解决方案，我建议在line 118 of tweepy/streaming.py之前添加以下内容：

except SSLError, e:
  if 'timeout' not in exception.message.lower(): # support all timeouts
    exception = e
    break
  if self.listener.on_timeout() == False:
    break
  if self.running is False:
    break
  conn.close()
  sleep(self.snooze_time)

为什么一开始就超时是个好问题。我没有什么比重复特拉维斯·梅林格关于设置更高的timeout更好的了。