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from typing import Any, Optional, List
from diskcache import Cache
from server.constant.constants import DISKCACHE_DIR
class DiskcacheClient:
def __init__(self, diskcache_dir: str) -> None:
self.cache: Cache = Cache(diskcache_dir)
def set(self, key: str, value: Any, ttl: Optional[int] = None) -> None:
"""
Set key/value with an optional time-to-live (ttl).
Args:
key (str): The key under which the value is stored.
value (Any): The value to store.
ttl (Optional[int]): Optional time-to-live in seconds.
"""
self.cache.set(key, value, expire=ttl)
def get(self, key: str) -> Any:
"""
Get the value of a key; return None if expired or not found.
Args:
key (str): The key whose value is to be retrieved.
Returns:
Any: The value associated with the key, or None.
"""
return self.cache.get(key, default=None)
def delete(self, key: str) -> None:
"""
Delete the specified key.
Args:
key (str): The key to be deleted.
"""
self.cache.delete(key)
def append_to_list(self,
key: str,
value: Any,
ttl: Optional[int] = None,
max_length: int = 5) -> None:
"""
Append an element to a list while keeping the list length not exceeding the maximum.
Args:
key (str): The key under which the list is stored.
value (Any): The value to append to the list.
ttl (Optional[int]): Optional time-to-live in seconds.
max_length (int): Maximum length of the list after appending.
"""
with self.cache.transact():
lst: List[Any] = list(self.cache.get(key, default=[]))
lst.append(value)
# Keep the list length not exceeding max_length
lst = lst[-max_length:]
self.cache.set(key, lst, expire=ttl)
def get_list(self, key: str) -> List[Any]:
"""
Get the entire list.
Args:
key (str): The key whose list value is to be retrieved.
Returns:
List[Any]: The list stored at the key, or an empty list.
"""
return self.cache.get(key, default=[])
def expire(self, key: str, ttl: int) -> None:
"""
Set an expiration time for the key.
Args:
key (str): The key for which to set the expiration.
ttl (int): Time-to-live in seconds.
"""
self.cache.expire(key, ttl)
# Initialize Diskcache client
diskcache_client = DiskcacheClient(DISKCACHE_DIR)
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