A low footprint ZeroMQ N-to-N Pub/Sub Proxy (and some candies)

zmcat is an extremely simple Pub/Sub proxy to allow N-Pub to N-Sub usecases.

Docker

Images available on both DockerHub and Github Container Registry:

• eteissonniere/zmcat
• ghcr.io/eteissonniere/zmcat

Usage

Proxy

Relies on ZMQ XSUB and XPUB sockets, as well as the proxy function from ZMQ. Will not display anything but will effectively proxy messages from the XSUB socket to the XPUB socket.

zmcat-proxy 
Start a dual binding pub/sub proxy

USAGE:
    zmcat proxy [OPTIONS]

OPTIONS:
    -b, --backend <BACKEND>      Specify the host and port to forward messages in URL format
                                 [default: tcp://*:6666]
    -c, --capture                If set to true, the proxy will spawn a new thread to capture and
                                 log all messages going through it
    -f, --frontend <FRONTEND>    Specify the host and port to receive messages in URL format
                                 [default: tcp://*:5555]
    -h, --help                   Print help information

Pub

Will connect to a ZMQ XPUB socket and publish messages to it. To publish messages, simply type them.

zmcat-pub 
Connect to a proxy's frontend and publish messages as typed in by the user

USAGE:
    zmcat pub [OPTIONS]

OPTIONS:
    -f, --frontend <FRONTEND>    Specify the host and port to publish messages to in URL format
                                 [default: tcp://localhost:5555]
    -h, --help                   Print help information

Sub

Will connect to a ZMQ XSUB socket and subscribe to messages from it, will display messages received on stdout.

zmcat-sub 
Connect to a proxy's backend and stream messages

USAGE:
    zmcat sub [OPTIONS]

OPTIONS:
    -b, --backend <BACKEND>    Specify the host and port to subscribe messages from in URL format
                               [default: tcp://localhost:6666]
    -h, --help                 Print help information