server: fixes latest implementation details on rtc offer and fastapi

server/reflector/app.py

@@ -1,9 +1,22 @@
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from reflector.views.rtc_offer import router as rtc_offer_router
+from reflector.events import subscribers_startup, subscribers_shutdown
+from contextlib import asynccontextmanager
+
+
+# lifespan events
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    for func in subscribers_startup:
+        await func()
+    yield
+    for func in subscribers_shutdown:
+        await func()
+
 
 # build app
-app = FastAPI()
+app = FastAPI(lifespan=lifespan)
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["*"],