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77 lines
2.6 KiB
77 lines
2.6 KiB
import warnings
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from datetime import timedelta as TimeDelta
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from typing import Optional
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from cachelib.file import FileSystemCache
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from flask import Flask
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from .._utils import total_seconds
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from ..base import ServerSideSession, ServerSideSessionInterface
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from ..defaults import Defaults
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class CacheLibSession(ServerSideSession):
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pass
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class CacheLibSessionInterface(ServerSideSessionInterface):
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"""Uses any :class:`cachelib` backend as a session storage.
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:param client: A :class:`cachelib` backend instance.
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:param key_prefix: A prefix that is added to storage keys.
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:param use_signer: Whether to sign the session id cookie or not.
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:param permanent: Whether to use permanent session or not.
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:param sid_length: The length of the generated session id in bytes.
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:param serialization_format: The serialization format to use for the session data.
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"""
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session_class = CacheLibSession
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ttl = True
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def __init__(
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self,
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app: Flask = None,
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client: Optional[FileSystemCache] = Defaults.SESSION_CACHELIB,
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key_prefix: str = Defaults.SESSION_KEY_PREFIX,
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use_signer: bool = Defaults.SESSION_USE_SIGNER,
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permanent: bool = Defaults.SESSION_PERMANENT,
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sid_length: int = Defaults.SESSION_ID_LENGTH,
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serialization_format: str = Defaults.SESSION_SERIALIZATION_FORMAT,
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):
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if client is None:
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warnings.warn(
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"No valid cachelib instance provided, attempting to create a new instance on localhost with default settings.",
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RuntimeWarning,
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stacklevel=1,
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)
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client = FileSystemCache("flask_session", threshold=500)
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self.cache = client
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super().__init__(
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None, key_prefix, use_signer, permanent, sid_length, serialization_format
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)
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def _retrieve_session_data(self, store_id: str) -> Optional[dict]:
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# Get the saved session (item) from the database
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return self.cache.get(store_id)
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def _delete_session(self, store_id: str) -> None:
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self.cache.delete(store_id)
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def _upsert_session(
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self, session_lifetime: TimeDelta, session: ServerSideSession, store_id: str
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) -> None:
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storage_time_to_live = total_seconds(session_lifetime)
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# Serialize the session data (or just cast into dictionary in this case)
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session_data = dict(session)
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# Update existing or create new session in the database
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self.cache.set(
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key=store_id,
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value=session_data,
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timeout=storage_time_to_live,
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)
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