Hi Devs,
In my attempts to proxy CURVE while sticking to ZMTP, I have failed
until now. I still think it is possible, but I cannot afford spending
more time on it. If someone can go on, you are welcome.
Everything is in one commit here - the code is simple :
https://github.com/lalebarde/libzmq/commit/8e321dde5a96b9ce185ab1016adcf42b4f233257#commitcomment-4783956
For that purpose, I have created a NOP mechanism, with no handcheck and
intended for the proxy, plus a surrogate feature that enables a socket
to build its mechanism on what it has been configured for instead of on
the peer's greeting, and to send a greeting mechanism different from the
configured one. In other words, the surrogate feature makes it possible
to avoid any mechanism transaction.
The test "test_surrogate_curve.cpp" fails to proxy CURVE via a NOP proxy:
Client (DEALER, CURVE) --------- (NOP, ROUTER) Proxy (ROUTER, NOP)
------------ (CURVE, DEALER) Worker
What happens is that the curve_client_t object DTORs just after having
sent the HELLO command. At least, if I change CURVE to NOP in the client
and worker, the test passes, either with use of surrogation with any
mechanism or not using surrogation at all.
I remain available for any question. Following Pieter advices, I am
going to try another way, with a ZMQ_STREAM proxy.
Cheers,
Laurent.
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