Implement reusable upload platform

upload/backend/session/state.py

@@ -0,0 +1,37 @@
+"""Общее состояние сессий, блокировка, лимиты и TTL."""
+
+import threading
+
+
+TTL_SECONDS = 30 * 60
+MAX_FILE_BYTES = 50 * 1024 * 1024
+MAX_SESSION_BYTES = 500 * 1024 * 1024
+
+_sessions: dict = {}
+_lock = threading.Lock()
+
+
+def _start_timer(sid: str) -> threading.Timer:
+    """Запустить таймер автоочистки сессии через TTL."""
+
+    def _clean():
+        with _lock:
+            _sessions.pop(sid, None)
+
+    timer = threading.Timer(TTL_SECONDS, _clean)
+    timer.daemon = True
+    timer.start()
+    return timer
+
+
+def configure(max_file_bytes: int = None, max_session_bytes: int = None,
+              ttl_seconds: int = None):
+    """Переопределить лимиты и TTL из конфигурации приложения."""
+
+    global MAX_FILE_BYTES, MAX_SESSION_BYTES, TTL_SECONDS
+    if max_file_bytes is not None:
+        MAX_FILE_BYTES = max_file_bytes
+    if max_session_bytes is not None:
+        MAX_SESSION_BYTES = max_session_bytes
+    if ttl_seconds is not None:
+        TTL_SECONDS = ttl_seconds