Hanzo PubSub is a lightweight, high-performance messaging system designed for cloud-native applications. It provides reliable pub/sub messaging, persistent streams, and exactly-once delivery semantics.

Features

Pub/Sub Messaging - Flexible publish-subscribe patterns with subject-based routing
Persistent Streams - Durable message storage with configurable retention
Consumer Groups - Scalable message consumption with automatic load balancing
Exactly-Once Delivery - Guaranteed message delivery with deduplication
Key-Value Store - Built-in distributed key-value storage
Object Store - Store and retrieve large objects efficiently
Clustering - Horizontal scaling with automatic failover

Quick Start

Docker

docker run -d --name hanzo-pubsub \
  -p 4222:4222 \
  -p 8222:8222 \
  hanzoai/pubsub:latest

Docker Compose

version: '3.8'
services:
  pubsub:
    image: hanzoai/pubsub:latest
    ports:
      - "4222:4222"  # Client connections
      - "8222:8222"  # Management/monitoring
    volumes:
      - pubsub-data:/data
    command: ["--jetstream", "--store_dir=/data"]

volumes:
  pubsub-data:

SDK Support

Python: pip install hanzo-pubsub
Go: go get github.com/hanzoai/pubsub-go
TypeScript: npm install @hanzo/pubsub
Rust: cargo add hanzo-pubsub

Example Usage

Basic Pub/Sub

from hanzo.pubsub import connect

async def main():
    # Connect to PubSub
    ps = await connect("nats://localhost:4222")
    
    # Subscribe to a subject
    async def handler(msg):
        print(f"Received: {msg.data}")
    
    await ps.subscribe("events.>", handler)
    
    # Publish messages
    await ps.publish("events.user.created", {"user_id": "123"})

Persistent Streams

from hanzo.pubsub import connect, StreamConfig

async def main():
    ps = await connect("nats://localhost:4222")
    js = ps.jetstream()
    
    # Create a stream
    await js.add_stream(StreamConfig(
        name="ORDERS",
        subjects=["orders.*"],
        retention="limits",
        max_msgs=1_000_000,
    ))
    
    # Publish to stream
    await js.publish("orders.new", {"order_id": "abc123"})
    
    # Create durable consumer
    consumer = await js.pull_subscribe("orders.*", durable="processor")
    
    # Process messages
    async for msg in consumer.fetch(batch=10):
        await process_order(msg.data)
        await msg.ack()

Architecture

┌──────────────────────────────────────────────────┐
│                    Cluster                        │
│  ┌─────────┐    ┌─────────┐    ┌─────────┐      │
│  │ Node 1  │◀──▶│ Node 2  │◀──▶│ Node 3  │      │
│  └─────────┘    └─────────┘    └─────────┘      │
│       │              │              │            │
│       └──────────────┼──────────────┘            │
│                      │                           │
│              ┌───────┴───────┐                   │
│              │  JetStream    │                   │
│              │  (Streams)    │                   │
│              └───────────────┘                   │
└──────────────────────────────────────────────────┘

README.md

Hanzo PubSub

Overview