Hi there,

Sorry to bother you, but I encountered an error in the topology WS
implementation. I'm working on a project that uses the topology view in Ryu
to display network performance.

The error catch on line 97 of* ryu/app/ws_topology.py* appears not catch
the error it is supposed to for me. It resulted in crashing the ws server
when the client did not return as expected (-- uncaught exception).

*To fix *this I've changed the import on line 38
from:  from ryu.contrib.tinyrpc.exc import InvalidReplyError
to:     from tinyrpc.exc import InvalidReplyError
And this seems to have fixed it. Not sure if this is common to all users,
or if this is important enough to trouble you with, or how to simply change
this myself in git.

Thank you for the topology view, hopefully I can share what I've done when
it's finished :)

Cheers,
Jordan Ansell
Victoria University of Wellington, NZ
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