pg-async-events 0.1.0

A simple async event handling library using PostgreSQL notifications.

pg-async-events

A simple asynchronous event handling library using PostgreSQL notifications. This library allows you to subscribe to and publish events using PostgreSQL's LISTEN/NOTIFY mechanism in an asynchronous environment.

This is useful in generative AI applications or for situations where other pub/sub systems are overkill.

Features

• Asynchronous Event Handling: Leverage asyncio and asyncpg to handle events without blocking your main application logic.
• PostgreSQL Notifications: Seamlessly integrates with PostgreSQL's LISTEN/NOTIFY to provide real-time event notifications.
• Simple API: Easy-to-use API for subscribing to channels and notifying events.

Installation

You can install the package directly from PyPI:

pip install pg_async_events

Usage

Quart

import pg_async_events as events

# Add your postgres credentials from the env
db_config = {
    "user": POSTGRES_USER,
    "password": POSTGRES_PASSWORD,
    "host": POSTGRES_HOST,
    "port": POSTGRES_PORT,
    "max_connections": 1,
}

@app.before_serving
async def setup():
    app.task_events = asyncio.create_task(events.server(db_config))

@app.after_serving
async def cleanup():
    app.task_events.cancel()

Notifications

import pg_async_events as events

async def listen_to_events():
    async for message in events.subscribe('your_channel'):
        print('Received:', message)

async def publish_event():
    payload = {'key': 'value'}
    await events.notify('your_channel', payload)

Requirements

• Python 3.8+
• PostgreSQL 9.0+ (with support for LISTEN/NOTIFY)
• asyncpg library

Author

Built by 255labs.xyz, the AI product and consulting startup helping people adapt to the AI age with consulting, product, and open-source development.

Contributing

Contributions are welcome! Please submit a pull request or open an issue to discuss the changes.

License

This project is licensed under the MIT License. See the LICENSE file for more details.

Thanks

• asyncpg for providing the asynchronous PostgreSQL driver.
• PostgreSQL community for their robust database and features like LISTEN/NOTIFY.