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import typing as t
from ellar.di import injectable
from .backends.local_cache import LocalMemCacheBackend
from .interface import ICacheService, ICacheServiceSync
from .model import BaseCacheBackend
class InvalidCacheBackendKeyException(Exception):
pass
class _CacheServiceSync(ICacheServiceSync):
def incr(
self,
key: str,
delta: int = 1,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> int:
_backend = self.get_backend(backend)
return _backend.incr(key, delta=delta, version=version)
def decr(
self,
key: str,
delta: int = 1,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> int:
_backend = self.get_backend(backend)
return _backend.decr(key, delta=delta, version=version)
get_backend: t.Callable[..., BaseCacheBackend]
def get(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> t.Any:
_backend = self.get_backend(backend)
return _backend.get(key, version=version)
def delete(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> bool:
_backend = self.get_backend(backend)
return _backend.delete(key, version=version)
def set(
self,
key: str,
value: t.Any,
ttl: t.Union[float, int, None] = None,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> bool:
_backend = self.get_backend(backend)
return _backend.set(key, value, version=version, ttl=ttl)
def touch(
self,
key: str,
ttl: t.Union[float, int, None] = None,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> bool:
_backend = self.get_backend(backend)
return _backend.touch(key, version=version, ttl=ttl)
def has_key(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> bool:
_backend = self.get_backend(backend)
return _backend.has_key(key, version=version)
@injectable
class CacheService(_CacheServiceSync, ICacheService):
"""
A Cache Backend Service that wraps Ellar cache backends.
"""
def __init__(
self, backends: t.Optional[t.Dict[str, BaseCacheBackend]] = None
) -> None:
if backends:
assert backends.get("default"), (
"CACHES configuration must have a 'default' key."
)
self._backends = backends or {
"default": LocalMemCacheBackend(key_prefix="ellar", version=1, ttl=300)
}
def get_backend(self, backend: t.Optional[str] = None) -> BaseCacheBackend:
_backend = backend or "default"
try:
return self._backends[_backend]
except KeyError as kex:
raise InvalidCacheBackendKeyException(
f"There is no backend configured with the name: '{_backend}'"
) from kex
async def get_async(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> t.Any:
_backend = self.get_backend(backend)
return await _backend.get_async(key, version=version)
async def delete_async(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> bool:
_backend = self.get_backend(backend)
return bool(await _backend.delete_async(key, version=version))
async def set_async(
self,
key: str,
value: t.Any,
ttl: t.Union[float, int, None] = None,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> bool:
_backend = self.get_backend(backend)
return await _backend.set_async(key, value, ttl=ttl, version=version)
async def touch_async(
self,
key: str,
ttl: t.Union[float, int, None] = None,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> bool:
_backend = self.get_backend(backend)
return await _backend.touch_async(key, ttl=ttl, version=version)
async def has_key_async(
self, key: str, version: t.Optional[str] = None, backend: t.Optional[str] = None
) -> bool:
_backend = self.get_backend(backend)
return await _backend.has_key_async(key, version=version)
async def incr_async(
self,
key: str,
delta: int = 1,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> int:
_backend = self.get_backend(backend)
return await _backend.incr_async(key, delta=delta, version=version)
async def decr_async(
self,
key: str,
delta: int = 1,
version: t.Optional[str] = None,
backend: t.Optional[str] = None,
) -> int:
_backend = self.get_backend(backend)
return await _backend.decr_async(key, delta=delta, version=version)