create mesh app and basic asgi websocket setup for communication

src/c3nav/asgi.py

@@ -0,0 +1,16 @@
+import os
+
+from channels.auth import AuthMiddlewareStack
+from channels.routing import ProtocolTypeRouter, URLRouter
+from django.core.asgi import get_asgi_application
+
+from c3nav.urls import websocket_urlpatterns
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
+
+application = ProtocolTypeRouter({
+  "http": get_asgi_application(),
+  "websocket": AuthMiddlewareStack(
+    URLRouter(websocket_urlpatterns)
+  ),
+})

src/c3nav/mesh/consumers.py

@@ -0,0 +1,12 @@
+from channels.generic.websocket import WebsocketConsumer
+
+
+class EchoConsumer(WebsocketConsumer):
+    def connect(self):
+        self.accept()
+
+    def disconnect(self, close_code):
+        pass
+
+    def receive(self, text_data):
+        self.send(text_data=text_data)

src/c3nav/mesh/urls.py

@@ -0,0 +1,7 @@
+from django.urls import path
+
+from c3nav.mesh.consumers import EchoConsumer
+
+websocket_urlpatterns = [
+    path('ws', EchoConsumer.as_asgi()),
+]

src/c3nav/routing.py

@@ -0,0 +1,18 @@
+import os
+
+from channels.auth import AuthMiddlewareStack
+from channels.routing import ProtocolTypeRouter, URLRouter
+from django.core.asgi import get_asgi_application
+
+import c3nav.site.routing
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
+
+application = ProtocolTypeRouter({
+  "http": get_asgi_application(),
+  "websocket": AuthMiddlewareStack(
+    URLRouter(
+      c3nav.site.routing.websocket_urlpatterns
+    )
+  ),
+})

src/c3nav/settings.py

@@ -237,6 +237,7 @@ INSTALLED_APPS = [
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'channels',
     'compressor',
     'bootstrap3',
     'c3nav.api',
@@ -245,6 +246,7 @@ INSTALLED_APPS = [
     'c3nav.routing',
     'c3nav.site',
     'c3nav.control',
+    'c3nav.mesh',
     'c3nav.editor',
 ]
 
@@ -287,6 +289,7 @@ X_FRAME_OPTIONS = 'DENY'
 ROOT_URLCONF = 'c3nav.urls'
 
 WSGI_APPLICATION = 'c3nav.wsgi.application'
+ASGI_APPLICATION = 'c3nav.asgi.application'
 
 USE_I18N = True
 USE_L10N = True

src/c3nav/urls.py

@@ -1,5 +1,6 @@
 from contextlib import suppress
 
+from channels.routing import URLRouter
 from django.conf import settings
 from django.contrib import admin
 from django.urls import include, path
@@ -8,6 +9,7 @@ import c3nav.api.urls
 import c3nav.control.urls
 import c3nav.editor.urls
 import c3nav.mapdata.urls
+import c3nav.mesh.urls
 import c3nav.site.urls
 
 urlpatterns = [
@@ -20,6 +22,10 @@ urlpatterns = [
     path('', include(c3nav.site.urls)),
 ]
 
+websocket_urlpatterns = [
+    path('mesh/', URLRouter(c3nav.mesh.urls.websocket_urlpatterns)),
+]
+
 if settings.DEBUG:
     with suppress(ImportError):
         import debug_toolbar

src/requirements/production.txt

@@ -15,3 +15,4 @@ qrcode==7.3.1
 matplotlib==3.5.1
 scipy==1.8.0
 django_libsass==0.9
+channels==3.0.4