[zeromq-dev] Limit number of connections on socket

[Auer, Jens]

Hi,

I am looking for a way to limit the number of connections to a configurable number. Our requirement says that for one specific endpoint, only a certain number of connections should be allowed. I hoped for socket option to do that, but I could not find any. Reading the documentation, I came up with the following ideas:

-       Create a new context for the restricted endpoint and restrict the number of connections with ZMQ_MAX_SOCKETS.

-       Install a socket monitor which monitors connect/disconnect events and counts active connections. When the number is exceeded, the new connection is closed immediately

-       Install a socket monitor which monitors connect/disconnect events and counts active connections. When the number is reached, install a filter blocking every new connection until one of the connections is closed.
Are there any other ways to do that? There is no real application-level protocol so I cannot close connections on that level. The application basically accepts connections and starts to send data immediately to anybody connecting.

I would be grateful if anybody could comment on these methods. Personally, I prefer the first one because it seems to be simpler and relies only on zeroMQ defined behaviour.

Best wishes,
  Jens Auer

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