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Temporary hack. Support for Redis Sentinel as result backend for Celery 4.0.2
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| """ | |
| This module adds Redis Sentinel transport support to Celery. | |
| Current version of celery doesn't support Redis sentinel client, which is must have for automatic failover. | |
| To use it:: | |
| import register_celery_alias | |
| register_celery_alias("redis-sentinel") | |
| celery = Celery(..., broker="redis-sentinel://...", backend="redis-sentinel://...") | |
| """ | |
| from celery.backends import BACKEND_ALIASES | |
| from kombu.transport import TRANSPORT_ALIASES | |
| from celery.backends.redis import RedisBackend | |
| from kombu.utils import cached_property | |
| from kombu.transport.redis import Transport, Channel | |
| from redis import Redis | |
| from redis.sentinel import Sentinel | |
| class RedisSentinelBackend(RedisBackend): | |
| def __init__(self, sentinels=None, sentinel_timeout=None, socket_timeout=None, | |
| min_other_sentinels=0, service_name=None, **kwargs): | |
| super(RedisSentinelBackend, self).__init__(**kwargs) | |
| conf = self.app.conf | |
| def _get(key): | |
| try: | |
| return conf['CELERY_REDIS_SENTINEL_%s' % key] | |
| except KeyError: | |
| pass | |
| self.sentinels = sentinels or _get("SENTINELS") | |
| self.sentinel_timeout = sentinel_timeout or _get("SENTINEL_TIMEOUT") | |
| self.socket_timeout = socket_timeout or _get("SOCKET_TIMEOUT") | |
| self.min_other_sentinels = min_other_sentinels or _get("MIN_OTHER_SENTINELS") | |
| self.service_name = service_name or _get("SERVICE_NAME") | |
| @cached_property | |
| def client(self): | |
| sentinel = Sentinel(self.sentinels, min_other_sentinels=self.min_other_sentinels, | |
| password=self.password, sentinel_kwargs={"socket_timeout": self.sentinel_timeout}) | |
| return sentinel.master_for(self.service_name, redis_class=Redis, socket_timeout=self.socket_timeout) | |
| class SentinelChannel(Channel): | |
| from_transport_options = Channel.from_transport_options + ( | |
| "service_name", | |
| "sentinels", | |
| "password", | |
| "min_other_sentinels", | |
| "sentinel_timeout", | |
| ) | |
| #noinspection PyUnresolvedReferences | |
| @cached_property | |
| def _sentinel_managed_pool(self): | |
| sentinel = Sentinel( | |
| self.sentinels, | |
| min_other_sentinels=getattr(self, "min_other_sentinels", 0), | |
| password=getattr(self, "password", None), | |
| sentinel_kwargs={"socket_timeout": getattr(self, "sentinel_timeout", None)}, | |
| ) | |
| return sentinel.master_for(self.service_name, self.Client, | |
| socket_timeout=self.socket_timeout).connection_pool | |
| def _get_pool(self): | |
| return self._sentinel_managed_pool | |
| class RedisSentinelTransport(Transport): | |
| Channel = SentinelChannel | |
| def register_celery_alias(alias="redis-sentinel"): | |
| BACKEND_ALIASES[alias] = "utils.celery_sentinel.RedisSentinelBackend" | |
| TRANSPORT_ALIASES[alias] = "utils.celery_sentinel.RedisSentinelTransport" |
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