[fix] race condition

repository/sandbox_session.py

@@ -1,3 +1,4 @@
+import threading
 from datetime import datetime
 
 from domain.sandbox import SandboxSession
@@ -7,22 +8,27 @@ from usecase.interface import SandboxSessionRepository
 class InMemorySandboxSessionRepository(SandboxSessionRepository):
     def __init__(self) -> None:
         self._sessions_by_chat_id: dict[str, SandboxSession] = {}
+        self._lock = threading.Lock()
 
     def get_active_by_chat_id(self, chat_id: str) -> SandboxSession | None:
-        return self._sessions_by_chat_id.get(chat_id)
+        with self._lock:
+            return self._sessions_by_chat_id.get(chat_id)
 
     def list_expired(self, now: datetime) -> list[SandboxSession]:
-        return [
-            session
-            for session in self._sessions_by_chat_id.values()
-            if session.expires_at <= now
-        ]
+        with self._lock:
+            return [
+                session
+                for session in self._sessions_by_chat_id.values()
+                if session.expires_at <= now
+            ]
 
     def save(self, session: SandboxSession) -> None:
-        self._sessions_by_chat_id[session.chat_id] = session
+        with self._lock:
+            self._sessions_by_chat_id[session.chat_id] = session
 
     def delete(self, session_id: str) -> None:
-        for chat_id, session in tuple(self._sessions_by_chat_id.items()):
-            if session.session_id == session_id:
-                del self._sessions_by_chat_id[chat_id]
-                return
+        with self._lock:
+            for chat_id, session in tuple(self._sessions_by_chat_id.items()):
+                if session.session_id == session_id:
+                    del self._sessions_by_chat_id[chat_id]
+                    return