[tor-bugs] #11558 [Obfsproxy]: obfsproxy breaks with old versions of twisted

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#11558: obfsproxy breaks with old versions of twisted
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     Reporter:  yawning    |      Owner:  asn
         Type:  defect     |     Status:  needs_review
     Priority:  normal     |  Milestone:
    Component:  Obfsproxy  |    Version:
   Resolution:             |   Keywords:  debian, twisted, ancient
Actual Points:             |  Parent ID:
       Points:             |
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Comment (by yawning):

 Hmm even if you make txsocksx optional there still needs to be code for
 handling Twisted versions that don't have
 `twisted.internet.error.UnsupportedAddressFamily`.  Instead of in
 `__init__.py` this could be done in `socks5.py` since that's the only
 place that uses that exception.

 Since it's just error handling, we could also change the code to sending a
 SOCKS5 General Failure error for `EAFNOSUPPORT`, but that seems less
 optimal for people that do have recent versions of Twisted.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11558#comment:5>
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