[zeromq-dev] Best way to punt on a ZMQ_REQ?

[Matt Weinstein]

Sorry, rep.cpp.  Too many windows :-)

On Jun 10, 2010, at 5:03 PM, Matt Weinstein wrote:

> PS I noticed this comment in pub.cpp -- I'm wondering if tearing down
> the sockets will clean up this problem?  (I don't own the thread, so I
> can't wait for completion on the socket.)
>
>         // The pipe is full...
>         // When this happens, we simply return an error.
>         // This makes REP sockets vulnerable to DoS attack when
>         // misbehaving requesters stop collecting replies.
>         // TODO: Tear down the underlying connection (?)
>
> On Jun 10, 2010, at 4:16 PM, Matt Weinstein wrote:
>
>> Folks,
>>
>> I'm using a ZMQ_REQ socket to send a query to a server, and I need to
>> timeout if the response isn't received on time.
>>
>> The best way would seem to be to zmq::poll with a timeout (not  
>> working
>> for me at present, see my prior email).  Alternatively I could use
>> ZMQ_NOBLOCK and a sleep loop, but that's ugly.
>>
>> In any event, after I go away I'm left with a socket that's in the
>> wrong state for the next request, which may arrive before the last
>> request.  I don't see any way of resetting a socket, so I'm presuming
>> my best bet is to tear down the socket and use a new one for the next
>> request?
>>
>> Meanwhile, what happens to the server at the other end of the  
>> request,
>> still holding pieces of state through a zmq::queue via a ZMQ_XREP
>> socket?
>>
>> I'm presuming tearing down the ZMQ_REQ side will just purge the
>> relevant data, and the reply will go into the ether?  Or will the
>> server get an EFSM or some such when it tries to send() back on its
>> REP stream?
>>
>> RSVP,
>>
>> Thanks!
>>
>> Matt
>>
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>
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