Merge pull request #11 from delsim/doc_tweaks

Prerelease 0.4.3

Author: GibbsConsulting

README.md

@@ -29,6 +29,8 @@ Then, just add `django_plotly_dash` to `INSTALLED_APPS` in your Django `settings
         ...
         ]
 
+Note that this package requires version 2.0 or greater of Django, due to the use of the `path` function for registering routes.
+
 ## Demonstration
 
 The source repository contains a demo application. To clone the repo and lauch the demo:

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/plotly_apps.py

@@ -52,6 +52,20 @@ def callback_size(dropdown_color, dropdown_size):
     )
 def callback_c(*args,**kwargs):
     da = kwargs['dash_app']
+
+    session_state = kwargs['session_state']
+
+    calls_so_far = session_state.get('calls_so_far',0)
+    session_state['calls_so_far'] = calls_so_far + 1
+
+    user_counts = session_state.get('user_counts',None)
+    user_name = str(kwargs['user'])
+    if user_counts is None:
+        user_counts = {user_name:1}
+        session_state['user_counts'] = user_counts
+    else:
+        user_counts[user_name] = user_counts.get(user_name,0) + 1
+
     return "Args are [%s] and kwargs are %s" %(",".join(args),str(kwargs))
 
 a3 = DjangoDash("Connected")
@@ -67,7 +81,6 @@ def callback_c(*args,**kwargs):
              label="momentum",
              channel_name="test_widget_channel",
              uid="and_this_one"),
-    dpd.DPDirectComponent(id="direct"),
     dcc.RadioItems(id="dropdown-one",options=[{'label':i,'value':j} for i,j in [
     ("O2","Oxygen"),("N2","Nitrogen"),("CO2","Carbon Dioxide")]
     ],value="Oxygen"),

demo/demo/settings.py

@@ -39,6 +39,7 @@
     'django.contrib.staticfiles',
 
     'channels',
+    'bootstrap4',
 
     'django_plotly_dash.apps.DjangoPlotlyDashConfig',
 ]
@@ -126,14 +127,22 @@
 STATIC_ROOT = os.path.join(BASE_DIR,'static')
 
 STATICFILES_DIRS = [
+    os.path.join(BASE_DIR,'demo','static'),
     ]
 
-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)) )
+# 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)) )
 
-# Fudge to work with channels in debug mode
-STATICFILES_DIRS.append(("dash/dpd_components","/home/mark/local/dpd-components/lib"))

demo/demo/static/demo/demo.css

@@ -0,0 +1,6 @@
+/* Extra CSS markup for demo pages */
+
+.btnspace { margin-bottom: 10px; }
+
+.dpd-example-wrapper { background-color: #e0e0e0; padding: 10px; }
+.dpd-example { background-color: white; }

demo/demo/templates/base.html

@@ -0,0 +1,30 @@
+<!DOCTYPE HTML>
+<html>
+ <head>
+   {%load plotly_dash%}
+   {%load staticfiles%}
+   {%load bootstrap4%}
+   {%bootstrap_css%}
+   {%bootstrap_javascript jquery="full"%}
+   <link rel="stylesheet" type="text/css" href="{%static "demo/demo.css"%}"></link>
+    <title>Django Plotly Dash Examples - {%block title%}{%endblock%}</title>
+ </head>
+ <body>
+   <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
+     <div class="navbar-nav">
+       <a class="navbar-brand" href="#">
+         <img src="{%static "demo/logo.svg"%}" alt="Logo"/>
+       </a>
+       <a class="nav-item nav-link btn btn-lg" href="{%url "home"%}">Contents</a>
+       <a class="nav-item nav-link btn btn-lg" href="{%url "demo-one"%}">Demo One - Simple Use</a>
+       <a class="nav-item nav-link btn btn-lg" href="{%url "demo-two"%}">Demo Two - Initial State</a>
+       <a class="nav-item nav-link btn btn-lg" href="{%url "demo-three"%}">Demo Three - Enhanced Callbacks</a>
+       <a class="nav-item nav-link btn btn-lg" href="{%url "demo-four"%}">Demo Four - Live Updating</a>
+     </div>
+   </nav>
+ <div class="container">
+   {%block content%}{%endblock%}
+ </div>
+</body>
+{%block post_body%}{%endblock%}
+</html>

demo/demo/templates/demo_four.html

@@ -0,0 +1,34 @@
+{%extends "base.html"%}
+{%load plotly_dash%}
+
+{%block post_body%}{%plotly_message_pipe%}{%endblock%}
+
+{%block title%}Demo Four - Live Updating{%endblock%}
+
+{%block content%}
+<h1>Live Updating</h1>
+<p>
+  Live updating uses a websocket connection. The server pushes messages to the UI, and this is then translated into a
+  callback through a dash component.
+</p>
+<div class="card bg-light border-dark">
+  <div class="card-body">
+    <p><span>{</span>% load plotly_dash %}</p>
+    <p><span>{</span>% plotly_app slug="connected-2" %}</p>
+  </div>
+</div>
+<p>
+</p>
+<div class="card border-dark">
+  <div class="card-body">
+    {%plotly_app slug="connected-2"%}
+  </div>
+</div>
+<p>
+</p>
+<div class="card border-dark">
+  <div class="card-body">
+    {%plotly_app slug="connected-2"%}
+  </div>
+</div>
+{%endblock%}

demo/demo/templates/demo_one.html

@@ -0,0 +1,26 @@
+{%extends "base.html"%}
+{%load plotly_dash%}
+
+{%block title%}Demo One - Simple Embedding{%endblock%}
+
+{%block content%}
+<h1>Simple App Embedding</h1>
+<p>
+  This is a simple example of use of a dash application within a Django template. Use of
+  the plotly_app template tag with the name of a dash application represents the simplest use of
+  the django_plotly_dash framework.
+</p>
+<div class="card bg-light border-dark">
+  <div class="card-body">
+    <p><span>{</span>% load plotly_dash %}</p>
+    <p><span>{</span>% plotly_app name="SimpleExample" %}</p>
+  </div>
+</div>
+<p></p>
+<div class="card border-dark">
+  <div class="card-body">
+    {%plotly_app name="SimpleExample"%}
+  </div>
+</div>
+{%endblock%}
+

demo/demo/templates/demo_three.html

@@ -0,0 +1,42 @@
+{%extends "base.html"%}
+{%load plotly_dash%}
+
+{%block title%}Demo Three - Additional Callback Functionality{%endblock%}
+
+{%block content%}
+<h1>Enhanced Callback Functionality</h1>
+<p>
+  If any callback is registered as an enhanced one, then all of the callbacks receive extra values
+  as kwargs. These include the Dash application instance, a per-session dictionary that can contain anything
+  suitable for inclusion in a standard Django session, and the Django User instance.
+  The session state is per user session at the Django level, so it is shared across all of the Dash applications.
+</p>
+<p>
+  Changes made to any values contained within the initial state can also be persisted when using enhanced callbacks. This is a
+  per-app-instance flag and, when set, the response of every callback is checked and persisted if it has changed. The second
+  of the two apps below is configured in this manner; any changes made on this page should reappear if one visits a different page and
+  then reloads this one. These changes can also be observed in the update timestamp or initial content json content of
+  the <a href="{%url "admin:django_plotly_dash_dashapp_changelist" %}">model</a>.
+</p>
+<div class="card bg-light border-dark">
+  <div class="card-body">
+    <p><span>{</span>% load plotly_dash %}</p>
+    <p><span>{</span>% plotly_app name="Ex2" ratio=0.15 %}</p>
+    <p><span>{</span>% plotly_app slug="ex2-3" ratio=0.15 %}</p>
+  </div>
+</div>
+<p>
+</p>
+<div class="card border-dark">
+  <div class="card-body">
+    {%plotly_app name="Ex2" ratio=0.15 %}
+  </div>
+</div>
+<p>
+</p>
+<div class="card border-dark">
+  <div class="card-body">
+    {%plotly_app slug="ex2-3" ratio=0.15 %}
+  </div>
+</div>
+{%endblock%}