56 lines
1.6 KiB
Python
56 lines
1.6 KiB
Python
from __future__ import annotations
|
|
|
|
import logging
|
|
import time
|
|
from collections import OrderedDict
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
DEFAULT_TTL_SECONDS = 120
|
|
|
|
|
|
class FileCacheEntry:
|
|
__slots__ = ("file_key", "file_path", "file_name", "cached_at")
|
|
|
|
def __init__(self, file_key: str, file_path: str = "", file_name: str = ""):
|
|
self.file_key = file_key
|
|
self.file_path = file_path
|
|
self.file_name = file_name
|
|
self.cached_at = time.monotonic()
|
|
|
|
|
|
class FileCache:
|
|
def __init__(self, ttl_seconds: int = DEFAULT_TTL_SECONDS):
|
|
self._ttl = ttl_seconds
|
|
self._entries: OrderedDict[str, FileCacheEntry] = OrderedDict()
|
|
|
|
def add(self, session_key: str, file_key: str, file_path: str = "", file_name: str = "") -> None:
|
|
self._evict_expired()
|
|
self._entries[session_key] = FileCacheEntry(file_key, file_path, file_name)
|
|
|
|
def get(self, session_key: str) -> FileCacheEntry | None:
|
|
self._evict_expired()
|
|
entry = self._entries.get(session_key)
|
|
if entry is not None:
|
|
return entry
|
|
return None
|
|
|
|
def clear(self, session_key: str) -> None:
|
|
self._entries.pop(session_key, None)
|
|
|
|
def _evict_expired(self) -> None:
|
|
now = time.monotonic()
|
|
expired = [k for k, v in self._entries.items() if now - v.cached_at > self._ttl]
|
|
for k in expired:
|
|
self._entries.pop(k, None)
|
|
|
|
|
|
_cache_instance: FileCache | None = None
|
|
|
|
|
|
def get_file_cache() -> FileCache:
|
|
global _cache_instance
|
|
if _cache_instance is None:
|
|
_cache_instance = FileCache()
|
|
return _cache_instance
|