plugin_health_check.py

from datetime import datetime, timedelta
from time import sleep

from django.conf import settings

from health_check.plugins import plugin_dir
from health_check.backends.base import BaseHealthCheckBackend, ServiceUnavailable
from health_check_celery3.tasks import add


class CeleryHealthCheck(BaseHealthCheckBackend):

    def check_status(self):
        timeout = getattr(settings, 'HEALTHCHECK_CELERY_TIMEOUT', 3)

        try:
            result = add.apply_async(args=[4, 4], expires=datetime.now() + timedelta(seconds=timeout))
            now = datetime.now()
            while (now + timedelta(seconds=3)) > datetime.now():
                print "            checking...."
                if result.ready():
                    result.forget()
                    return True
                sleep(0.5)
        except IOError:
            pass
        raise ServiceUnavailable("Unknown error")

plugin_dir.register(CeleryHealthCheck)