From d8c87ff22e54dc0b3b9412d5cbce88abe418143e Mon Sep 17 00:00:00 2001
From: Dominic Zimmer <s8dozimm@stud.uni-saarland.de>
Date: Thu, 13 Aug 2020 12:31:25 +0200
Subject: [PATCH] Add graceful shutdown hook

---
 main.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/main.py b/main.py
index 6356efa..33b4b2c 100644
--- a/main.py
+++ b/main.py
@@ -3,6 +3,7 @@ import traceback
 import urllib.parse
 import os
 import json
+import asyncio
 
 from model import Model
 
@@ -75,5 +76,9 @@ if __name__ == '__main__':
         with open(filename) as f:
             data = json.load(f)
     app['model'] = Model(model = data)
+
+    async def on_shutdown(app):
+        app['model'].save()
+
+    app.on_shutdown.append(on_shutdown)
     aiohttp.web.run_app(app, port=42042)
-    app['model'].save()