ivy-ho-club3 3.0.4

A short description of my awesome library.

Club3: The Ivy & Ho Anniversary Protocol 🥂

A serverless, decentralized, conflict-free shared space.

"Two nodes, one network, zero servers."

Club3 is a Python library created to celebrate the 3rd Anniversary of Ivy & Ho. It creates a shared, synchronized dictionary across a local network. It allows devices to discover each other instantly and stay in perfect sync without a central server—just like a strong partnership.

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💖 The Philosophy

Under the hood, this project is built on a CRDT (Conflict-free Replicated Data Type) using a "Last-Write-Wins" register.

• Resilience: If we disagree (concurrent updates), the system converges to a single truth without crashing.
• Forgiveness: It accepts the newest update, understanding that the state of things changes over time.
• Connection: It uses UDP Multicast, meaning it doesn't need a "manager" or a "server." It just needs the two of us on the same network.

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🚀 Features

• Serverless Sync: Uses UDP Multicast (224.1.1.1) to find peers automatically.
• Real-Time: Changes on one laptop appear on the other instantly.
• Modern Async API: Supports async for loops to trigger UI updates cleanly.
• Smart Discovery: Includes "Thundering Herd" suppression—when a new device joins, only one peer volunteers to sync data, keeping the network quiet.
• Thread-Safe: Built with threading.Lock to handle background network traffic while you interact with the data.

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📦 Installation

No external dependencies required. Just standard Python 3.

pip install ivy-ho-club3

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💻 Usage

1. The Simple "Hello"

Open Python on Computer A:

from ivy_ho import Club3

# Connect to the space
space = Club3()

# Write a note
space['anniversary'] = "Happy 3rd Year!"
space['dinner_plans'] = "Sushi at 7pm"

Open Python on Computer B:

from ivy_ho import Club3

space = Club3()

# It syncs automatically!
print(space['anniversary']) 
# Output: "Happy 3rd Year!"

2. The Reactive Dashboard (Async)

Use this to build a UI or a script that reacts whenever the other person types.

import asyncio
from ivy_ho import Club3

async def main():
    club = Club3()
    print(f"❤️ Connected as Node: {club._node_id}")

    # This loop pauses until Ivy or Ho changes something
    async for key, value in club.watch():
        print(f"✨ New Update: [{key}] is now -> {value}")

if __name__ == "__main__":
    try:
        asyncio.run(main())
    except KeyboardInterrupt:
        print("Disconnected.")

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⚙️ Under the Hood

For the curious engineers:

UDP Multicast: We bind to 0.0.0.0 and join group 224.224.224.1. This broadcasts packets to everyone on the LAN.

Packet Structure: We use pickle to serialize data, sending up to 65,535 bytes (the max UDP packet size).

Thundering Herd Suppression: When a new node sends OP_SYNC_REQ, existing nodes wait a random 0.1-0.5s. The first to wake up broadcasts an OP_SYNC_CLAIM, silencing the others. This ensures we don't flood the network with duplicate data.

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🥂 Dedication

To Ivy & Ho,

Here is to 3 years of:

Fixing bugs/issues together.

Merging our lives without conflicts.

Staying synchronized, no matter the latency.

Happy Anniversary!

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v3.0.4 - Built with Python & Love.