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Python 3 Bi-directional RPC Framework using ZeroMQ and Asyncio

Project Description


Poseur is an RPC framework built upon ZeroMQ sockets, leveraging Python’s asyncio package for high-performance even on the most demanding of services.

Poseur provides an extensible serialization layer, referred to as codecs, used between the RPC endpoints. Two codecs are included: Python’s pickle Module and MessagePack.

As a design decision, Poseur only supports CPython 3.5+. While it may work with older Python versions inadvertently, we do not explicitly support such versions. Use at your own risk!

Other Features Include:

  • Bi-directional RPC. (Servers can call RPC Function on Clients).
  • First Class Exceptions.

Upcoming Features Include:

  • Heartbeats between RPC endpoints.
  • Endpoint Authentication
  • Endpoint Encryption


Any features or APIs are subject to mass changes before version 1.0 is published. We will attempt to make a few changes as possible, but we can not make any guarantees.

Use with cautiion!


Poseur is not yet on PyPI. In the meantime, you can install this package by cloning this repository. Note that we only support Python 3.5+:

$ python3 install
$ pip install msgpack-python

or to install the extra dependency for the MessagePack serializer and install the package in develop mode:

$ pip install -e .[msgpack]


Python 3.5 or greater


  • pyzmq


  • msgpack-python (For MessagePack Codec Support)

Message Specification

The working message specification can be found in the repository under spec.rst. Until version 1.0 is released, this is subject to change at any time.


Client to Server RPC

Set up an RPC server and enroll any functions that are to be made available for clients.

import uuid
from poseur import Server, rpc

def get_random_uuid_str():
    return str(uuid.uuid4())

server = Server()

Set up an RPC client, connect to the server, and call the enrolled function.

import asyncio
from poseur import Client

client = Client("username1")

async def get_and_print():
    value = await client.get_random_uuid_str()

loop = asyncio.get_event_loop()


>>> b4c360c2-efba-4853-b8f0-b61557ce6147


Due to using ZeroMQ for the transport mechanism, the order for which a server binds and clients connect is irrelevant. However, there is one caveat when using bi-directional RPC. The client must be connected before the server attempts to make an remote-call to a client, otherwise an exception will be raised.

Release History

Release History

This version
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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
poseur-0.1.0.tar.gz (8.3 kB) Copy SHA256 Checksum SHA256 Source Apr 18, 2016

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