141 lines
4.0 KiB
Python
141 lines
4.0 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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快取單一來源模組。
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ADR-017 Phase 3f-2: 將 sales/import/export/daily 會共同碰到的
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module-level cache 收斂到這裡，避免各 route 各自持有一份 dict。
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"""
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import os
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import time
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from pathlib import Path
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class FingerprintCache:
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"""TTL + fingerprint 的小型 in-memory cache。"""
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def __init__(self, name, fingerprint_fn):
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self.name = name
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self._store = {}
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self._fp_fn = fingerprint_fn
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def get(self, key, ttl=300):
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entry = self._store.get(key)
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if not entry:
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return None
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if time.time() - entry['ts'] > ttl:
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return None
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try:
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if self._fp_fn() != entry['fp']:
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return None
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except Exception:
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pass
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return entry['data']
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def set(self, key, data):
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try:
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fp = self._fp_fn()
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except Exception:
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fp = None
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self._store[key] = {'data': data, 'ts': time.time(), 'fp': fp}
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def clear(self):
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self._store.clear()
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_SALES_DF_CACHE = {}
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_SALES_PROCESSED_CACHE = {}
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_SALES_OPTIONS_CACHE = {}
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_SALES_ANALYSIS_RESULT_CACHE = {}
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_SALES_CACHE_MAX_ENTRIES = 10
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_SALES_CACHE_TTL = 600
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_DAILY_SALES_PROCESSED_CACHE = {}
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_DASHBOARD_DATA_CACHE = {
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'consolidated_data': None,
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'consolidated_timestamp': None,
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'today_start': None,
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'full_data': None,
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'full_timestamp': None,
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}
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_DASHBOARD_CACHE_TTL = 1800
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_BASE_DIR = Path(__file__).resolve().parents[1]
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_DASHBOARD_SHARED_CACHE_FILE = _BASE_DIR / "data" / "dashboard_full_cache.pkl"
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_DASHBOARD_STALE_CACHE_FILE = _BASE_DIR / "data" / "dashboard_full_cache_stale.pkl"
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def cleanup_sales_cache():
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"""清理 sales 處理後快取的過期與超額條目。"""
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current_time = time.time()
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expired_keys = [
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key for key, value in _SALES_PROCESSED_CACHE.items()
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if value.get('time') and current_time - value['time'] > _SALES_CACHE_TTL
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]
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for key in expired_keys:
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_SALES_PROCESSED_CACHE.pop(key, None)
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if len(_SALES_PROCESSED_CACHE) > _SALES_CACHE_MAX_ENTRIES:
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sorted_items = sorted(
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[(key, value.get('time', 0)) for key, value in _SALES_PROCESSED_CACHE.items()],
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key=lambda item: item[1],
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)
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for key, _ in sorted_items[:-_SALES_CACHE_MAX_ENTRIES]:
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_SALES_PROCESSED_CACHE.pop(key, None)
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def set_sales_processed_cache(key, entry, aliases=()):
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"""寫入 sales cache，並可同步寫入別名 key。"""
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entry.setdefault('time', time.time())
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_SALES_PROCESSED_CACHE[key] = entry
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for alias in aliases:
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_SALES_PROCESSED_CACHE[alias] = entry
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cleanup_sales_cache()
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def clear_sales_cache_for_table(table_name):
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"""匯入資料後清除指定表對應的所有 sales cache key。"""
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_SALES_DF_CACHE.pop(table_name, None)
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keys_to_delete = [
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key for key in list(_SALES_PROCESSED_CACHE.keys())
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if key == table_name or key.startswith(f"{table_name}_")
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]
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for key in keys_to_delete:
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_SALES_PROCESSED_CACHE.pop(key, None)
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def clear_sales_cache():
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"""清除所有 sales cache。"""
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_SALES_DF_CACHE.clear()
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_SALES_PROCESSED_CACHE.clear()
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_SALES_OPTIONS_CACHE.clear()
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_SALES_ANALYSIS_RESULT_CACHE.clear()
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def clear_daily_sales_cache():
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"""清除當日業績 cache。"""
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_DAILY_SALES_PROCESSED_CACHE.clear()
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def clear_dashboard_cache():
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"""清除商品看板 cache。"""
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_DASHBOARD_DATA_CACHE.clear()
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_DASHBOARD_DATA_CACHE.update({
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'consolidated_data': None,
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'consolidated_timestamp': None,
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'today_start': None,
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'full_data': None,
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'full_timestamp': None,
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})
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try:
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if os.path.exists(_DASHBOARD_SHARED_CACHE_FILE):
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try:
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os.replace(_DASHBOARD_SHARED_CACHE_FILE, _DASHBOARD_STALE_CACHE_FILE)
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except OSError:
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os.remove(_DASHBOARD_SHARED_CACHE_FILE)
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except FileNotFoundError:
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pass
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except OSError:
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pass
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