Caching tool for python, working with Redis single instance and Redis cluster mode
Installation
$ pip install cache-house
or with poetry
poetry add cache-house
Quick Start
cache decorator work with async and sync functions
from cache_house.backends.redis_backend import RedisCache
from cache_house.cache import cache
import asyncio
RedisCache.init()
@cache() # default expire time is 180 seconds
async def test_cache(a: int,b: int):
print("async cached")
return [a,b]
@cache()
def test_cache_1(a: int, b: int):
print("cached")
return [a, b]
if __name__ == "__main__":
print(test_cache_1(3,4))
print(asyncio.run(test_cache(1,2)))
Check stored cache key
➜ $ rdcli KEYS "*"
1) cachehouse:main:8f65aed1010f0062a783c83eb430aca0
2) cachehouse:main:f665833ea64e4fc32653df794257ca06
Setup Redis cache instance
You can pass all redis-py arguments to RedisCache.init method and additional arguments :
def RedisCache.init(
host: str = "localhost",
port: int = 6379,
encoder: Callable[..., Any] = ...,
decoder: Callable[..., Any] = ...,
namespace: str = ...,
key_prefix: str = ...,
key_builder: Callable[..., Any] = ...,
password: str = ...,
db: int = ...,
**kwargs
)
or you can set your own encoder and decoder functions
from cache_house.backends.redis_backend import RedisCache
def custom_encoder(data):
return json.dumps(data)
def custom_decoder(data):
return json.loads(data)
RedisCache.init(encoder=custom_encoder, decoder=custom_decoder)
Default encoder and decoder is pickle module.
Setup Redis Cluster cache instance
All manipulation with RedisCache same with a RedisClusterCache
from cache_house.backends.redis_cluster_backend import RedisClusterCache
from cache_house.cache import cache
RedisClusterCache.init()
@cache()
async def test_cache(a: int,b: int):
print("cached")
return [a,b]
def RedisClusterCache.init(
cls,
host="localhost",
port=6379,
encoder: Callable[..., Any] = pickle_encoder,
decoder: Callable[..., Any] = pickle_decoder,
startup_nodes=None,
cluster_error_retry_attempts: int = 3,
require_full_coverage: bool = True,
skip_full_coverage_check: bool = False,
reinitialize_steps: int = 10,
read_from_replicas: bool = False,
namespace: str = DEFAULT_NAMESPACE,
key_prefix: str = DEFAULT_PREFIX,
key_builder: Callable[..., Any] = key_builder,
**kwargs,
)
You can set expire time (seconds) , namespace and key prefix in cache decorator
@cache(expire=30, namespace="app", key_prefix="test")
async def test_cache(a: int,b: int):
print("cached")
return [a,b]
if __name__ == "__main__":
print(asyncio.run(test_cache(1,2)))
Check stored cache
rdcli KEYS "*"
1) test:app:f665833ea64e4fc32653df794257ca06
If your function works with non-standard data types, you can pass custom encoder and decoder functions to the cache decorator.
import asyncio
import json
from cache_house.backends.redis_backend import RedisCache
from cache_house.cache import cache
RedisCache.init()
def custom_encoder(data):
return json.dumps(data)
def custom_decoder(data):
return json.loads(data)
@cache(expire=30, encoder=custom_encoder, decoder=custom_decoder, namespace="custom")
async def test_cache(a: int, b: int):
print("async cached")
return {"a": a, "b": b}
@cache(expire=30)
def test_cache_1(a: int, b: int):
print("cached")
return [a, b]
if __name__ == "__main__":
print(asyncio.run(test_cache(1, 2)))
print(test_cache_1(3, 4))
Check stored cache
rdcli KEYS "*"
1) cachehouse:main:8f65aed1010f0062a783c83eb430aca0
2) cachehouse:custom:f665833ea64e4fc32653df794257ca06
22 Dec 20, 2022
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