Github user gemmellr commented on the issue:
https://github.com/apache/qpid-proton/pull/142
The use of "invalid-field" for the error feels like it is maybe a little
off. Its possible/likely there is nothing wrong with the information in the
fields of the attach, as none of it is really actually checked (e.g whether its
the same remote handle, itself a session:handle-in-use error) other than
someone got there previously with the name. Perhaps "illegal-state" might be
more applicable given the actual check being done?
That said though, its not actually 100% clear it is an illegal state. The
spec covers attaching an active link a second time as resulting in the first
attachment being detached with the "stolen" link error. Its described for
handling across different connections (something proton thus cant actually do
on its own) e.g during reconnect, but its not clear that precludes it being the
case on a single session or connection. However, it does seem far more likely
to be in result of an error for the situation to ever occur on a single
session/connection so perhaps treating it as such is the way to go in the end
(plus any alternative would I guess be much harder to achieve, so maybe its the
only choice for now).
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