Moving to a better and separate channels demo

Author: Mark Gibbs

demo/demo/asgi.py

@@ -0,0 +1,8 @@
+import os
+import django
+from channels.routing import get_default_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "demo.settings")
+django.setup()
+application = get_default_application()
+

demo/demo/consumers.py

@@ -10,6 +10,11 @@ def __init__(self, *args, **kwargs):
         global ALL_CONSUMERS
         ALL_CONSUMERS.append(self)
 
+        print("Creating a MessageConsumer")
+        print(len(ALL_CONSUMERS))
+
+        self.callcount = 0
+
     def connect(self):
         self.accept()
 
@@ -20,6 +25,7 @@ def disconnect(self, close_code):
             if c != self:
                 ac.append(c)
         ALL_CONSUMERS = ac
+        return super(MessageConsumer, self).disconnect(close_code)
 
     def send_to_widgets(self, channel_name, label, value):
         message = json.dumps({'channel_name':channel_name,
@@ -30,6 +36,16 @@ def send_to_widgets(self, channel_name, label, value):
         for c in ALL_CONSUMERS:
             c.send(message)
 
+        self.callcount += 1
+        if self.callcount > 10:
+            import gc
+            print("Running collection")
+            gc.collect()
+            self.callcount = 0
+
+        import objgraph
+        objgraph.show_most_common_types()
+
     def receive(self, text_data):
         message = json.loads(text_data)
 

demo/demo/settings.py

@@ -128,12 +128,19 @@
 STATICFILES_DIRS = [
     ]
 
-import dash_core_components as dcc
-_rname = os.path.join(os.path.dirname(dcc.__file__),'..')
-for dash_module_name in ['dash_core_components',
-                         'dash_html_components',
-                         'dash_renderer',]:
-    STATICFILES_DIRS.append( ("dash/%s"%dash_module_name, os.path.join(_rname,dash_module_name)) )
-
-# Fudge to work with channels in debug mode
-STATICFILES_DIRS.append(("dash/dpd_components","/home/mark/local/dpd-components/lib"))
+# In order to serve dash components locally - not recommended in general, but
+# can be useful for development especially if offline - we add in the root directory
+# of each module. This is a bit of fudge and only needed if serve_locally=True is
+# set on a DjangoDash instance.
+
+if DEBUG:
+
+    import dash_core_components as dcc
+    _rname = os.path.join(os.path.dirname(dcc.__file__),'..')
+
+    for dash_module_name in ['dash_core_components',
+                             'dash_html_components',
+                             'dash_renderer',
+                             'dpd_components',]:
+        STATICFILES_DIRS.append( ("dash/%s"%dash_module_name, os.path.join(_rname,dash_module_name)) )
+

demo/demo/templates/second_page.html

@@ -13,11 +13,12 @@
  </div>
  <div>
    WS Content here
-   {%plotly_app name="Connected"%}
+   {%plotly_app slug="connected-2"%}
  </div>
  <div>
    WS Content here
-   {%plotly_app slug="connected-2"%}
+   {%plotly_app slug="simpleexample-1"%}
  </div>
 </body>
+{ % plotly_message_pipe % }
 </html>

demo/demo/urls.py

@@ -27,3 +27,10 @@
     path('admin/', admin.site.urls),
     path('django_plotly_dash/', include('django_plotly_dash.urls')),
 ]
+
+# Add in static routes so daphne can serve files; these should be masked eg with nginx for production use
+
+from django.conf import settings
+from django.conf.urls.static import static
+
+urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)