add chat model

chat_box/admin.py

@@ -1,3 +0,0 @@
-from django.contrib import admin
-
-# Register your models here.

chat_box/migrations/0001_initial.py

@@ -0,0 +1,30 @@
+# Generated by Django 2.2.9 on 2020-01-28 05:07
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('judge', '0100_auto_20200127_0059'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Message',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('time', models.DateTimeField(auto_now_add=True, verbose_name='posted time')),
+                ('body', models.TextField(max_length=8192, verbose_name='body of comment')),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='judge.Profile', verbose_name='user')),
+            ],
+            options={
+                'verbose_name': 'message',
+                'verbose_name_plural': 'messages',
+                'ordering': ('-time',),
+            },
+        ),
+    ]

chat_box/models.py

@@ -1,3 +1,45 @@
-from django.db import models
+# based on https://github.com/narrowfail/django-channels-chat
 
-# Create your models here.
+from asgiref.sync import async_to_sync
+from channels.layers import get_channel_layer
+from django.db import models
+from django.db.models import CASCADE
+from django.utils.translation import gettext_lazy as _
+
+
+from judge.models.profile import Profile
+
+
+__all__ = ['Message']
+
+
+class Message(models.Model):
+    author = models.ForeignKey(Profile, verbose_name=_('user'), on_delete=CASCADE)
+    time = models.DateTimeField(verbose_name=_('posted time'), auto_now_add=True)
+    body = models.TextField(verbose_name=_('body of comment'), max_length=8192)
+
+    def notify_ws_clients(self):
+        # inform client that there is a new message
+        notification = {
+            'type': 'recieve_group_message',
+            'message': '{}'.format(self.id)
+        }
+        channel_layer = get_channel_layer()
+        # print("user.id {}".format(self.user.id))
+        # print("user.id {}".format(self.recipient.id))
+
+        async_to_sync(channel_layer.group_send)("{}".format(self.user.id), notification)
+        async_to_sync(channel_layer.group_send)("{}".format(self.recipient.id), notification)
+
+    def save(self, *args, **kwargs):
+        new_message = self.id
+        self.body = self.body.strip()
+        super(Message, self).save(*args, **kwargs)
+        if new_message is None:
+            self.notify_ws_clients()
+
+    class Meta:
+        app_label = 'chat_box'
+        verbose_name = 'message'
+        verbose_name_plural = 'messages'
+        ordering = ('-time',)

chat_box/views.py

@@ -1,8 +1,7 @@
 from django.shortcuts import render
 from django.utils.translation import gettext as _
+from django.views import View
 
 
-def chat(request):
-    return render(request, 'chat/chat.html', {
-        'title': _('Chat Box'),
-    })
+class ChatView(View):
+    template_name = 'chat.html'

dmoj/urls.py

@@ -1,4 +1,4 @@
-from chat_box.views import chat
+from chat_box.views import ChatView
 from django.conf import settings
 from django.conf.urls import include, url
 from django.contrib import admin
@@ -367,7 +367,7 @@ urlpatterns = [
 
     url(r'^custom_checker_sample/', about.custom_checker_sample, name='custom_checker_sample'),
 
-    url(r'chat/', chat, name='chat'),
+    url(r'chat/', ChatView.as_view(), name='chat'),
 ]
 
 favicon_paths = ['apple-touch-icon-180x180.png', 'apple-touch-icon-114x114.png', 'android-chrome-72x72.png',