Claude Code: Fix app startup - use modern lifespan context manager instead of deprecated on_event decorators

app.py

@@ -19,6 +19,7 @@ def get_app():
     """Create FastAPI app with imports inside function."""
     from fastapi import FastAPI, Request, HTTPException
     from fastapi.responses import JSONResponse
+    from contextlib import asynccontextmanager
     import logging
 
     print(">>> CAIN: Creating FastAPI app...", flush=True)
@@ -32,10 +33,19 @@ def get_app():
     logger = logging.getLogger(__name__)
     logger.info(">>> CAIN: FastAPI initialization starting")
 
-    app = FastAPI(title="HuggingClaw - Cain", version="0.0.1")
-
     START_TIME = time.time()
 
+    @asynccontextmanager
+    async def lifespan(app: FastAPI):
+        """Lifespan context manager for startup/shutdown events."""
+        print(">>> CAIN: Startup complete - ready to serve", flush=True)
+        logger.info(">>> CAIN: Ready to serve requests on port %s", os.environ.get('PORT', '7860'))
+        yield
+        print(">>> CAIN: Shutdown triggered", flush=True)
+        logger.info(">>> CAIN: Shutting down")
+
+    app = FastAPI(title="HuggingClaw - Cain", version="0.0.1", lifespan=lifespan)
+
     @app.get("/")
     async def root():
         """Root endpoint - simple alive status."""
@@ -56,18 +66,6 @@ def get_app():
             content={"error": True, "message": str(exc), "type": type(exc).__name__}
         )
 
-    @app.on_event("startup")
-    async def startup():
-        """Log startup complete."""
-        print(">>> CAIN: Startup complete - ready to serve", flush=True)
-        logger.info(">>> CAIN: Ready to serve requests on port %s", os.environ.get('PORT', '7860'))
-
-    @app.on_event("shutdown")
-    async def shutdown():
-        """Log shutdown."""
-        print(">>> CAIN: Shutdown triggered", flush=True)
-        logger.info(">>> CAIN: Shutting down")
-
     print(">>> CAIN: FastAPI app created successfully", flush=True)
     return app