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https://github.com/pewdiepie-archdaemon/odysseus.git
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Kenny Van de Maele
92300b5d67
services/search/cache.py set CACHE_DIR = services/cache (the source tree) and mkdir'd it at import, unguarded. In Docker services/ is the read-only image layer, so the mkdir fails at import (same class as the analytics bug #2366). Move the cache under DATA_DIR/cache (writable on Docker and native) and wrap the mkdir so an unwritable path disables disk cache instead of crashing import. Part of #3331. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
"""Search and content caching with LRU eviction."""
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import hashlib
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import logging
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from datetime import datetime, timedelta
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from pathlib import Path
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from typing import Dict
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from core.constants import DATA_DIR
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logger = logging.getLogger(__name__)
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# Cache directories
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CACHE_DIR = Path(DATA_DIR) / "cache"
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SEARCH_CACHE_DIR = CACHE_DIR / "search"
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CONTENT_CACHE_DIR = CACHE_DIR / "content"
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CACHE_MAX_ENTRIES = 1000
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# Create cache directories. Guarded so an unwritable path (e.g. a read-only
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# mount) degrades to no-disk-cache instead of crashing module import.
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try:
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SEARCH_CACHE_DIR.mkdir(parents=True, exist_ok=True)
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CONTENT_CACHE_DIR.mkdir(parents=True, exist_ok=True)
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except OSError as _e:
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logger.warning("Search cache directory unavailable (%s); disk cache disabled", _e)
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# Track cache size for LRU eviction
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search_cache_index: Dict[str, datetime] = {}
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content_cache_index: Dict[str, datetime] = {}
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# Cache metrics (shared across modules)
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cache_metrics = {"hits": 0, "misses": 0, "evictions": 0}
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def generate_cache_key(data: str) -> str:
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"""Generate a unique cache key using SHA-256 hash."""
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return hashlib.sha256(data.encode("utf-8")).hexdigest()
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def cleanup_cache(cache_dir: Path, cache_index: Dict[str, datetime], max_age: timedelta):
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"""Remove expired cache entries and enforce LRU policy."""
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current_time = datetime.now()
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files_in_dir = {f.name.split(".")[0]: f for f in cache_dir.glob("*.cache")}
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to_remove = []
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for key, timestamp in list(cache_index.items()):
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if current_time - timestamp > max_age or key not in files_in_dir:
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to_remove.append(key)
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if key in files_in_dir:
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files_in_dir[key].unlink(missing_ok=True)
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for key in to_remove:
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cache_index.pop(key, None)
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cache_metrics["evictions"] += 1
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if len(cache_index) > CACHE_MAX_ENTRIES:
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sorted_items = sorted(cache_index.items(), key=lambda x: x[1])
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excess_count = len(cache_index) - CACHE_MAX_ENTRIES
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for key, _ in sorted_items[:excess_count]:
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cache_index.pop(key, None)
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cache_file = cache_dir / f"{key}.cache"
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cache_file.unlink(missing_ok=True)
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cache_metrics["evictions"] += 1
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