Class CacheBackend

celery/backends/cache.py:90–163

Cache result backend.

class CacheBackend(KeyValueStoreBackend):
    """Cache result backend."""

    servers = None
    supports_autoexpire = True
    supports_native_join = True
    implements_incr = True

    def __init__(self, app, expires=None, backend=None,
                 options=None, url=None, **kwargs):
        options = {} if not options else options
        super().__init__(app, **kwargs)
        self.url = url

        self.options = dict(self.app.conf.cache_backend_options,
                            **options)

        self.backend = url or backend or self.app.conf.cache_backend
        if self.backend:
            self.backend, _, servers = self.backend.partition('://')
            self.servers = servers.rstrip('/').split(';')
        self.expires = self.prepare_expires(expires, type=int)
        try:
            self.Client, self.key_t = backends[self.backend]()
        except KeyError:
            raise ImproperlyConfigured(UNKNOWN_BACKEND.format(
                self.backend, ', '.join(backends)))
        self._encode_prefixes()  # rencode the keyprefixes

    def get(self, key):
        return self.client.get(key)

    def mget(self, keys):
        return self.client.get_multi(keys)

    def set(self, key, value):
        return self.client.set(key, value, self.expires)

    def delete(self, key):
        return self.client.delete(key)

    def _apply_chord_incr(self, header_result_args, body, **kwargs):
        chord_key = self.get_key_for_chord(header_result_args[0])
        self.client.set(chord_key, 0, time=self.expires)
        return super()._apply_chord_incr(
            header_result_args, body, **kwargs)

    def incr(self, key):
        return self.client.incr(key)

    def expire(self, key, value):
        return self.client.touch(key, value)

    @cached_property
    def client(self):
        return self.Client(self.servers, **self.options)

    def __reduce__(self, args=(), kwargs=None):