Further update Daphne/Channels for v4

- Move routing to asgi.py per Django convention
- Use Consumer.as_asgi() for ASGI 3 compatibility
- Use the new Daphne application server

tin/asgi.py

@@ -1,9 +1,49 @@
+"""
+ASGI config for tin project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/4.2/howto/deployment/asgi/
+"""
+
 import os
+from typing import Optional
 
-from channels.routing import get_default_application
+from channels.auth import AuthMiddlewareStack
+from channels.generic.websocket import WebsocketConsumer
+from channels.routing import ProtocolTypeRouter, URLRouter
 
-import django
+from django.core.asgi import get_asgi_application
+from django.urls import path
+
+from .apps.submissions.consumers import SubmissionJsonConsumer
 
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "tin.settings")
-django.setup()
-application = get_default_application()
+
+
+class WebsocketCloseConsumer(WebsocketConsumer):
+    def connect(self):
+        self.accept()
+        self.close()
+
+    def receive(self, text_data: Optional[str] = None, bytes_data: Optional[bytes] = None):
+        pass
+
+    def disconnect(self, code):
+        pass
+
+
+application = ProtocolTypeRouter(
+    {
+        "http": get_asgi_application(),
+        "websocket": AuthMiddlewareStack(
+            URLRouter(
+                [
+                    path("submissions/<int:submission_id>.json", SubmissionJsonConsumer.as_asgi()),
+                    path("<path:path>", WebsocketCloseConsumer.as_asgi()),
+                ]
+            )
+        ),
+    }
+)

tin/settings/__init__.py

@@ -45,13 +45,13 @@
 # Application definition
 
 INSTALLED_APPS = [
+    "daphne",
     "django.contrib.admin",
     "django.contrib.auth",
     "django.contrib.contenttypes",
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
-    "channels",
     "social_django",
     "django_extensions",
     "django_celery_results",
@@ -99,7 +99,7 @@
 ]
 
 WSGI_APPLICATION = "tin.wsgi.application"
-ASGI_APPLICATION = "tin.routing.application"
+ASGI_APPLICATION = "tin.asgi.application"
 
 
 CHANNEL_LAYERS = {

tin/urls.py

@@ -1,7 +1,7 @@
 """tin URL Configuration
 
 The `urlpatterns` list routes URLs to views. For more information please see:
-    https://docs.djangoproject.com/en/2.1/topics/http/urls/
+    https://docs.djangoproject.com/en/4.2/topics/http/urls/
 Examples:
 Function views
     1. Add an import:  from my_app import views

tin/wsgi.py

@@ -4,7 +4,7 @@
 It exposes the WSGI callable as a module-level variable named ``application``.
 
 For more information on this file, see
-https://docs.djangoproject.com/en/2.1/howto/deployment/wsgi/
+https://docs.djangoproject.com/en/4.2/howto/deployment/wsgi/
 """
 
 import os