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Patchwork Node

Worker node for Patchwork - an asynchronous, event-driven microframework for distributed services.

The node fetches messages from a message broker, routes them to async handlers, runs handlers on processing units and settles messages: commits, retries, reroutes or backoffs them.

Requirements

  • Python 3.11+
  • patchwork-core 2.0+ and a broker client package, eg. patchwork-client-kafka or patchwork-client-redis

Installation

pip install patchwork-node

Optional extras: patchwork-node[metrics] for Prometheus metrics.

Example

from patchwork.core import Message
from patchwork.core.client.local import LocalBroker, LocalPublisher, LocalSubscriber
from patchwork.node import Worker
from patchwork.node.core import TaskRouter
from patchwork.node.node import run
from patchwork.node.processor import InlineUnit

router = TaskRouter(processor=InlineUnit(concurrency=10))


@router.on("user.created")
async def user_created(message: Message):
    print(message.get_payload())


broker = LocalBroker()
worker = Worker(
    subscriber=LocalSubscriber(broker=broker, queues=["users"]),
    publisher=LocalPublisher(broker=broker),
)
worker.add_router(router)
run(worker)

Documentation

https://patchwork-framework.gitlab.io/node

Metadata

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