wehub-resource-sync
68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
"""Shared config file cache used by multiple routers.
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This module owns the cached read of ``config.json`` so that routers
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(resumes, enrichment, config) can share it without importing each other.
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"""
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import copy
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import json
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import logging
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import time
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from typing import Any
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from app.config import settings
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logger = logging.getLogger(__name__)
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# Cache state — accessed without a lock because:
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# 1. The app runs single-worker uvicorn (one thread, cooperative async).
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# 2. The GIL protects dict/float assignment; worst-case TOCTOU is a
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# redundant disk read (benign, same file, same result).
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# 3. A threading.Lock would block the event loop; an asyncio.Lock would
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# require making load_config async and changing every caller.
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_config_cache: dict[str, Any] = {}
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_config_cache_time: float = 0.0
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_CONFIG_CACHE_TTL: float = 300.0 # 5 minutes
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def invalidate_config_cache() -> None:
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"""Invalidate the config cache so the next read fetches from disk.
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Call this after any write to config.json.
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"""
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global _config_cache, _config_cache_time
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_config_cache = {}
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_config_cache_time = 0.0
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def load_config() -> dict[str, Any]:
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"""Load configuration from config file with 5-minute TTL cache.
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Returns a deep copy so callers cannot corrupt the cached data.
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"""
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global _config_cache, _config_cache_time
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now = time.monotonic()
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if _config_cache and (now - _config_cache_time) < _CONFIG_CACHE_TTL:
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return copy.deepcopy(_config_cache)
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config_path = settings.config_path
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if not config_path.exists():
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_config_cache = {}
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_config_cache_time = now
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return {}
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try:
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_config_cache = json.loads(config_path.read_text())
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_config_cache_time = now
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return copy.deepcopy(_config_cache)
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except (json.JSONDecodeError, OSError) as e:
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logger.error("Failed to load config: %s", e)
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_config_cache = {}
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_config_cache_time = now
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return {}
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def get_content_language() -> str:
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"""Get configured content language from cached config."""
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config = load_config()
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return config.get("content_language", config.get("language", "en"))
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