How to use JSON-RPC with ZeroMQ in Python?

We’ll use ZeroMQ to take JSON-RPC requests. It should respond to “ping” with “pong”.

Install pyzmq to take requests and jsonrpcserver to process them:

pip install pyzmq jsonrpcserver

Create a server.py:

from jsonrpcserver import method, Result, Success, dispatch
import zmq

socket = zmq.Context().socket(zmq.REP)


@method
def ping() -> Result:
    return Success("pong")


if __name__ == "__main__":
    socket.bind("tcp://*:5000")
    while True:
        request = socket.recv().decode()
        socket.send_string(dispatch(request))

Start the server:

$ python ./server.py

Client

Use jsonrpcclient to send requests:

pip install pyzmq jsonrpcclient

from jsonrpcclient import request_json, parse_json, Ok
import zmq

socket = zmq.Context().socket(zmq.REQ)
socket.connect("tcp://localhost:5000")
socket.send_string(request_json("ping"))
response = parse_json(socket.recv().decode())

>>> response.result
'pong'