Proyecto completo con configuracion de variables de entorno para EasyPanel

backend/cache_manager.py

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+# backend/cache_manager.py
+"""Caché global en memoria con refresco en segundo plano (igual que el dashboard de ventas)."""
+import time
+import threading
+from typing import Any, Callable, Dict, Tuple
+
+_CACHE: Dict[str, Tuple[float, Any]] = {}
+_LOCK = threading.Lock()
+_DEFAULT_TTL = 900  # 15 min
+
+
+def _make_key(prefix: str, args: tuple) -> str:
+    return prefix + ":" + "|".join(str(a) for a in args)
+
+
+def cache_get_or_set(prefix: str, args: tuple, loader: Callable[[], Any], ttl: int = _DEFAULT_TTL) -> Any:
+    key = _make_key(prefix, args)
+    now = time.time()
+    with _LOCK:
+        hit = _CACHE.get(key)
+        if hit and (now - hit[0] < ttl):
+            return hit[1]
+    value = loader()
+    with _LOCK:
+        _CACHE[key] = (now, value)
+    return value
+
+
+def cache_keys():
+    with _LOCK:
+        return list(_CACHE.keys())
+
+
+def cache_refresh_existing(loader_for_key):
+    for key in cache_keys():
+        try:
+            nuevo = loader_for_key(key)
+            if nuevo is not None:
+                with _LOCK:
+                    _CACHE[key] = (time.time(), nuevo)
+        except Exception as e:
+            print(f"[cache refresh] {key}: {e}")
+
+
+def cache_invalidate(prefix: str = None) -> None:
+    with _LOCK:
+        if prefix is None:
+            _CACHE.clear()
+        else:
+            for k in list(_CACHE.keys()):
+                if k.startswith(prefix + ":"):
+                    del _CACHE[k]
+
+
+def cache_stats() -> dict:
+    with _LOCK:
+        return {"entradas": len(_CACHE), "claves": list(_CACHE.keys())}
+
+
+_background_started = False
+
+
+def start_background_refresh(refresh_fn: Callable[[], None], interval: int = 900):
+    global _background_started
+    if _background_started:
+        return
+    _background_started = True
+
+    def _loop():
+        while True:
+            time.sleep(interval)
+            try:
+                refresh_fn()
+            except Exception as e:
+                print(f"[background refresh] error: {e}")
+
+    t = threading.Thread(target=_loop, daemon=True)
+    t.start()
+    print(f"[cache] refresco en segundo plano cada {interval}s iniciado")