Migdalor

Migdalor is a cluster membership library for modern asyncio Python distributed systems running in Kubernetes.

Migdalor doesn't require a separate broker (e.g. Redis, etcd, Zookeeper, Chubby, etc) to work, but leverage Kubernetes out-of-the-box capabilities to solve the peer discovery problem.

Features

• Modern Asyncio Pythonic API
• Brokerless Kubernetes native peer discovery based on headless services
• Hooks into membership change events
• Ability to manage membership manually

Installation

pip install midgalor
# or
# poetry add midgalor
# pdm add midgalor

Usage

import migdalor

cluster = migdalor.Cluster(
    node_address=(node_address),  # the current node address (e.g. 127.0.0.1:8001)
    discovery=migdalor.KubernetesServiceDiscovery(service_address=cluster_address), # Kubernetes headless service address (e.g. cluster:8000)
    ## Callbacks on different events
    # nodes_added_handlers=[...] 
    # nodes_removed_handlers=[...],
    ## Membership update rate
    # update_every_secs=10,
)

await cluster.start()

# You can also add or remove nodes manually if you support that in your protocol
await cluster.add([("127.0.0.1", 8001)])
# await cluster.remove([("127.0.0.1", 8001)])

await cluster.stop()

Midgalor comes with some comprehensive example to help you get started:

• The Party Cluster - An example of using Migdalor to implement peer discovery in Kubernetes cluster