Exception on program exit using SSL in python >= 3.4 ?

[petersilva]

I think this will hit anyone connecting to an SSL broker on python > 3.4, but not sure. If someone else can reproduce it, that would be good.

I connect to a broker, and without SSL, the code works fine. When SSL is on, it still works fine, but as part of sys.exit() processing it prints out this:

Exception ignored in: <bound method _AbstractTransport.__del__ of <amqplib.client_0_8.transport.SSLTransport object at 0x7f93e0834dd8>>
Traceback (most recent call last):
File "/home/peter/.local/lib/python3.5/site-packages/amqplib-1.0.2-py3.5.egg/amqplib/client_0_8/transport.py", line 97, in __del__
File "/home/peter/.local/lib/python3.5/site-packages/amqplib-1.0.2-py3.5.egg/amqplib/client_0_8/transport.py", line 136, in close
File "/home/peter/.local/lib/python3.5/site-packages/amqplib-1.0.2-py3.5.egg/amqplib/client_0_8/transport.py", line 208, in _shutdown_transport
File "/usr/lib/python3.5/ssl.py", line 971, in unwrap
s = self._sslobj.unwrap()
File "/usr/lib/python3.5/ssl.py", line 642, in unwrap
return self._sslobj.shutdown()
ssl.SSLError: Underlying socket connection gone (_ssl.c:2020)
b

Nothing in the application seems responsible for this. It just always happens in sys.exit()

I found two methods of suppressing the error:
in amqplib/client_0_8/transport.py

I can either comment out the __del__() method, or
put a try/except: pass clause in close()

I read a bit, and it seems that in python >= 3.4 it has gotten more consistent about calling __del__()
( PEP442 ) but that is just a guess.

I can offer a patch with either fix if one is blessed. But I don't know whether either approach is good. Any suggestions?

[petersilva]

It has nothing to do with the PEP442. shows up on older pythons as well.