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Tattle is a Python 3.5+ implementation of the Scalable Weakly-consistent Infection-style Process Group Membership (SWIM) gossip protocol for managing cluster membership in a distributed Python application. The tattle library is designed to help developers create distributed applications in Python by providing a framework for managing cluster membership, disseminating member status, and detecting member failures. In addition to managing cluster membership tattle can be used to disseminate arbitrary messages throughout the cluster.

Usage (node.py):

import sys
import asyncio
import tattle


async def run_node():
    # create node
    cluster = await tattle.Cluster(config).start()

    # join cluster
    if join is not None:
        await cluster.join(tattle.parse_address(join))


# parse arguments
port = sys.argv[1] if len(sys.argv) > 1 else 7900
join = sys.argv[2] if len(sys.argv) > 2 else None

config = tattle.Configuration(name='node-%d' % port, bind_port=port)

asyncio.get_event_loop().run_until_complete(run_node())
asyncio.get_event_loop().run_forever()

Running the Example:

python3 node.py &
python3 node.py 7901 localhost:7900 &
python3 node.py 7902 localhost:7900 &