pyomq

Python binding for omq.rs, a Rust libzmq port. Drop-in pyzmq replacement on the common path.

Install

uv pip install pyomq
uv pip install 'pyomq[test]'   # adds pytest, pyzmq for the interop suite

The published wheel includes optional features: plain, curve, lz4. Use pyomq.has("curve") at runtime to check availability.

Published wheels currently target Linux. Other platforms can build from sdist when the local Rust/Python toolchain supports them. Windows pyomq support is not complete on main yet.

Usage

import pyomq as zmq  # drop-in for `import zmq` from pyzmq

ctx = zmq.Context()
push = ctx.socket(zmq.PUSH)
push.connect("tcp://127.0.0.1:5555")
push.send(b"hello")
push.close()
ctx.term()

For asynchronous code:

import pyomq
import pyomq.asyncio as zmq_async

ctx = zmq_async.Context()
sock = ctx.socket(pyomq.PUSH)
await sock.connect("tcp://127.0.0.1:5555")
await sock.send(b"hello")
await sock.close()

Status

Sync and asyncio APIs both ship in this release. All 20 ZMTP socket types are wired:

Standard (RFC 28 + 47): PAIR, PUB, SUB, REQ, REP, DEALER, ROUTER, PULL, PUSH, XPUB, XSUB, STREAM.
Draft: SERVER, CLIENT (RFC 41), RADIO, DISH (RFC 48), GATHER, SCATTER (RFC 49), PEER, CHANNEL (RFC 51).

Transports: tcp://, ipc://, inproc://, and udp:// (RADIO/DISH only). Optional features built into the wheel: plain, curve, lz4.

DISH groups: use socket.join(b"group") / socket.leave(b"group") to manage subscriptions; messages are sent as multipart [group, body].

Backend

pyomq is built on omq-tokio (multi-threaded tokio runtime). The runtime runs on a dedicated background thread; every Python call releases the GIL across the runtime trip.

Performance

See COMPARISONS.md for full tables.

pyomq vs pyzmq performance

2-process loopback throughput and latency vs pyzmq, measured on Linux 6.12 (Debian 13), Intel i7-8700B 3.2 GHz, Rust 1.95.0.

`zmq.proxy()` forwarding (128 B, TCP)

	pyomq	pyzmq	ratio
PUSH/PULL msg/s	2.77 M/s	1.53 M/s	1.81×
REQ/REP rt/s	8,360/s	4,511/s	1.85×

pyomq's proxy() forwards directly between sockets on the tokio runtime, no Python per-message overhead. pyzmq's zmq.proxy() calls libzmq's C-level zmq_proxy. PUSH/PULL forwarding is throughput-bound and pyomq is ~1.8x faster. REQ/REP proxy is latency-bound (4 TCP hops per round-trip); pyomq is ~1.9x faster thanks to direct socket forwarding.

Run scripts/update_perf.py (after maturin develop --release) to re-measure, regenerate the chart, and update the proxy table.

Compression transports

OMQ.rs adds a transparent LZ4 compression transport on top of TCP: lz4+tcp://. Swap the scheme in your endpoint string and everything else stays the same:

push = ctx.socket(zmq.PUSH)
push.bind("lz4+tcp://127.0.0.1:5555")

pull = ctx.socket(zmq.PULL)
pull.connect("lz4+tcp://127.0.0.1:5555")

Both peers must use a matching compression endpoint. Payloads below ~512 B are sent as-is (the codec detects that compression would expand them).

lz4+tcp:// supports dictionary auto-training (off by default). When enabled, it samples the first 100 outbound messages, builds a 2 KiB dict, and ships it to the peer once. After that the compression threshold drops from 512 B to 128 B, so small structured messages start compressing too. Pure Rust (lz4rip), no C compiler required.

Enable it on sockets that send compressible traffic before bind()/connect():

push.compression_auto_train = 1
# or: push.setsockopt(zmq.OMQ_COMPRESSION_AUTO_TRAIN, 1)

See BENCHMARKS_COMPRESSION.md for throughput charts and benchmark details. Wire format: LZ4 transport RFC.

CURVE authentication

CURVE encrypts traffic and authenticates the server to the client. To also authenticate clients to the server, call set_curve_auth() before bind()/connect():

server_pub, server_sec = zmq.curve_keypair()
client_pub, client_sec = zmq.curve_keypair()

pull = ctx.socket(zmq.PULL)
pull.curve_server = 1
pull.curve_publickey = server_pub
pull.curve_secretkey = server_sec

# Option 1: allow specific client keys (checked in Rust, no GIL overhead)
pull.set_curve_auth([client_pub])

# Option 2: custom callback. PeerInfo has .public_key (Z85) and
# .identity (bytes or None).
pull.set_curve_auth(lambda peer: peer.public_key in allowed_keys)

# Option 3: accept any valid CURVE client (the default)
pull.set_curve_auth(None)

No ZAP, no filesystem key management. The callback runs during the CURVE handshake; returning a falsy value rejects the client.

Develop

cd bindings/pyomq
uv venv && source .venv/bin/activate
uv pip install maturin pytest pyzmq
maturin develop --release
pytest -v

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MD5	`8c1bc66e27f76fcffbe29c6fdb12ced9`
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Provenance

The following attestation bundles were made for pyomq-0.18.3-cp311-abi3-macosx_10_12_x86_64.whl:

Publisher: release-pyomq.yml on paddor/omq.rs

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: pyomq-0.18.3-cp311-abi3-macosx_10_12_x86_64.whl
- Subject digest: 4fcef3a72c20ec6d20d445fcf87c87b341eca2112b5503e6dbdb737919342d6c
- Sigstore transparency entry: 2298117176
- Sigstore integration time: Jul 31, 2026
Source repository:
- Permalink: paddor/omq.rs@eb02187358b26c350ca3ed46ed6ae688305ccb76
- Branch / Tag: refs/tags/pyomq-v0.18.3
- Owner: https://github.com/paddor
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: release-pyomq.yml@eb02187358b26c350ca3ed46ed6ae688305ccb76
- Trigger Event: push