Add a django middleware to cleanup db connections.

This severely impacts performance, though without it we are getting
django.db.utils.InterfaceError once connections in the pool go stale.

etebase_fastapi/main.py

@@ -5,6 +5,7 @@ from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.middleware.trustedhost import TrustedHostMiddleware
 
+from .middleware import DjangoDbConnectionCleanupMiddleware
 from .exceptions import CustomHttpException
 from .msgpack import MsgpackResponse
 from .routers.authentication import authentication_router
@@ -42,6 +43,7 @@ def create_application(prefix="", middlewares=[]):
 
         app.include_router(test_reset_view_router, prefix=f"{BASE_PATH}/test/authentication")
 
+    app.add_middleware(DjangoDbConnectionCleanupMiddleware)
     app.add_middleware(
         CORSMiddleware,
         allow_origin_regex="https?://.*",

etebase_fastapi/middleware.py

@@ -0,0 +1,15 @@
+from starlette.types import ASGIApp, Receive, Scope, Send
+from django.db import close_old_connections, reset_queries
+
+
+class DjangoDbConnectionCleanupMiddleware:
+    def __init__(self, app: ASGIApp):
+        self.app = app
+
+    async def __call__(self, scope: Scope, receive: Receive, send: Send):
+        reset_queries()
+        close_old_connections()
+        try:
+            await self.app(scope, receive, send)
+        finally:
+            close_old_connections()