[zeromq-dev] publisher side filtering

ernie elukie at comcast.net
Wed Jun 30 13:59:04 CEST 2010

Hi Pieter,

> ZeroMQ does not directly support this, you would build it as an
> application on top, defining your own protocol to connect clients and
> server.

Yes.  I have the protocol defined.  I just can not figure out what type 
of ZeroMQ pattern I can use to accomplish this.  Pub/sub doesn't work. 
REQ/REP isn't what I want because there is no immediate reply to the client.

With a 'regular' socket, I'd listen on a port, accept new connections 
and have a new socket to link with a message client.  ZeroMQ handles all 
this for me and the message based transport which is great.  But, I'm 
still at a loss for how I can accomplish this.  Maybe I need to use the 
PAIR pattern, but can I have multiple clients connect to the same port? 
  I'm not sure how to identify the message with a client because all I 
have is the message.


> I'm designing something that looks a bit like this, with peer-to-peer
> message flow, and rough-grained security based on "streams" of data
> rather than a topic tree.  It needs to work over multicast, meaning
> that you can't apply access controls at the server side.
> -Pieter
> On Wed, Jun 30, 2010 at 2:54 AM, ernie<elukie at comcast.net>  wrote:
>> I am looking at building a message dispatch system.  The clients connect
>> to a server on a well known port and subscribe to 'topics'.  Clients can
>> also generate 'topics' of their own which are published to other
>> subscribed clients.
>> I need the subscription filtering to be done on the server rather than
>> the individual clients.  One reason is "psuedo-security" -- some of the
>> 'topics' I do not want to be pushed to certain clients.  Another reason
>> is the 'topic' subscriptions will be sparse -- only a few of the main
>> clients will be subscribing to individual 'topics'.
>> Looking at the message patterns available in zeroMQ, I'm not clear that
>> I can accomplish this.  I need to be able to identify which client
>> generated a message and route it to subscribed clients.  I can not do
>> this with the pub/sub pattern.  Since there is no response, I do not see
>> that I can use the req/rep pattern.  I am new to zeromq, so I figure I
>> am not understanding how or if I can implement this.  Any suggestions
>> would be appreciated.
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