Are all HttpError in python subclasses of IOError

Question

In our code we catch IOError and log it before reraising. I am getting a "connection reset by peer", but nothing in the logs. Is "connection reset by peer" a subclass of IOError in python?

     .....
  File "/usr/lib/python2.5/httplib.py", line 1047, in readline
    s = self._read()
  File "/usr/lib/python2.5/httplib.py", line 1003, in _read
    buf = self._ssl.read(self._bufsize)
error: (104, 'Connection reset by peer')

Answer 1

The stack trace you pasted looks like some Exception of class error with arguments (104, 'Connection reset by peer).

So it looks like it's not a HTTPError exception at all. It looks to me like it's actually a socket.error. This class is indeed a subclass of IOError since Python 2.6.

But I guess that's not your question, since you are asking about HttpError exceptions. Can you rephrase your question to clarify your assumptions and expectations?

Comment from usawaretech:

How are you finding out it is a socket error? MY code is something like: try:risky_code(); except IOError: logger.debug('...'); raise; As I am assuming that HttpError is a subclass of IOError, when I get that exception, I am assuming that it be logged. There is nothing in my logs

I guess it is a socket.error because I used the index of the standard library documentation, and because I encountered this error before.

What version of Python are you using? I guess it's Python 2.5 or earlier.

If your intent is to log and re-raise exceptions, it would be a better idea to use a bare except:

try:
    risky_code()
except:
    logger.debug(...)
    raise

Also, you can find the module where the exception class was defined using exception.__module__.