nameko-cron 0.1.0

Nameko cron extension

Nameko Cron

Nameko Cron entrypoint fires based on a cron expression. It is not cluster-aware and will fire on all service instances. The cron schedule is based on croniter.

Usage

from nameko_cron import cron


class Service:
    name ="service"

    @cron('*/5 * * * *')
    def ping(self):
        # executes every 5 minutes
        print("pong")

timezone-aware cron schedules are also available

from nameko_cron import cron


class Service:
    name ="service"

    @cron('0 12 * * *', tz='America/Chicago')
    def ping(self):
        # executes every day at noon America/Chicago time
        print("pong")

by default, if a worker takes longer than the next scheduled run the worker will wait until the task is complete before immediately launching a new worker. This behavior can be controlled via the concurrency keyword argument.

ConcurrencyPolicy.WAIT is that default behavior.

ConcurrencyPolicy.ALLOW will spawn a worker regardless of whether existing workers are still running.

ConcurrencyPolicy.SKIP will skip a run if the previous worker lapsed the next scheduled run.