17.12

demoweb/routing.py

+from channels.routing import ProtocolTypeRouter, URLRouter
+from django.urls import re_path
+from channels.routing import URLRouter
+from channels.http import AsgiHandler
+from channels.auth import AuthMiddlewareStack
+import django_eventstream
+
+urlpatterns = [
+
+    re_path(r'events/',
+            AuthMiddlewareStack(URLRouter(django_eventstream.routing.urlpatterns)),
+            {'channels': ['notice']}),
+    re_path(r'', AsgiHandler),
+]
+
+application = ProtocolTypeRouter({
+    'http' : URLRouter(urlpatterns)
+})

demoweb/settings.py

+"""
+Django settings for demoweb project.
+
+Generated by 'django-admin startproject' using Django 2.2.6.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.2/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = '8f$z8o$#psi(4)hsn&jk7^6kyj*tvzpsc!3&uajy^e$og3#z!3'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'rest_framework',
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+
+    'posts.apps.PostsConfig',
+    'channels',
+    'django_eventstream',
+
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+    'django_grip.GripMiddleware',
+    'django.middleware.security.SecurityMiddleware',
+]
+
+ROOT_URLCONF = 'demoweb.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [os.path.join(BASE_DIR, 'templates')]
+        ,
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'demoweb.wsgi.application'
+ASGI_APPLICATION = 'demoweb.routing.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/2.2/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.2/topics/i18n/
+
+LANGUAGE_CODE = 'de-de'
+
+TIME_ZONE = 'Europe/Berlin'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.2/howto/static-files/
+
+STATIC_URL = '/static/'

demoweb/urls.py

+"""demoweb URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.2/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path, include
+from posts import views
+import posts.views
+
+
+urlpatterns = [
+    path('', posts.views.index),
+    path('posts/', include('posts.urls')),
+    path('admin/', admin.site.urls),
+    path('new/', views.new, name='new')
+]

demoweb/wsgi.py

+"""
+WSGI config for demoweb project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.2/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'demoweb.settings')
+
+application = get_wsgi_application()

posts/admin.py

+from django.contrib import admin
+
+# Register your models here.

posts/apps.py

+from django.apps import AppConfig
+
+
+class PostsConfig(AppConfig):
+    name = 'posts'

posts/models.py

+from django.db import models
+
+# Create your models here.
+class Notice(models.Model):
+    notice_title = models.CharField(max_length=80)
+    notice_text = models.CharField(max_length=400)
+    pub_start = models.DateTimeField()
+    pub_end = models.DateTimeField()

posts/tests.py

+from django.test import TestCase
+
+# Create your tests here.

posts/views.py

+from django.shortcuts import render, redirect
+from django.http import HttpResponse, JsonResponse
+from .models import Notice
+from django.utils import timezone
+import logging
+from .forms import NoticeForm
+from .serializers import NoticeSerializer
+from rest_framework.parsers import JSONParser
+from django.views.decorators.csrf import csrf_exempt
+from django_eventstream import send_event
+
+logger = None
+
+# Create your views here.
+def home(request):
+    return HttpResponse('Es gibt nichts hier.... bye bye')
+
+def initLogger():
+    global logger
+    if logger == None:
+        logger = logging.getLogger('django.db.backends')
+        logger.setLevel(logging.DEBUG)
+        logger.addHandler(logging.StreamHandler())
+
+def index(request):
+    initLogger()
+    notices = Notice.objects.all()
+    notices = notices.filter(pub_start__lte=timezone.now() )
+    notices = notices.filter(pub_end__gte=timezone.now())
+    context = { "notices" : notices }
+    return render(request, 'posts/index.html', context)
+
+def new(request):
+    if request.method == "POST":
+        form = NoticeForm(request.POST)
+        if form.is_valid():
+            newNotice = Notice(notice_title=form.cleaned_data['title'],
+                               notice_text=form.cleaned_data['text'],
+                               pub_start=form.cleaned_data['start'],
+                               pub_end=form.cleaned_data['end'])
+            newNotice.save()
+    context = {'form' : NoticeForm()}
+    return render(request, 'posts/edit.html', context)
+
+def delete(request, deleteId=None):
+    if deleteId != None:
+        delNotice = Notice.objects.get(id=deleteId)
+        if delNotice != None:
+            delNotice.delete()
+    return redirect('index')
+
+@csrf_exempt
+def notice_list(request):
+    if request.method == 'GET':
+        notices = Notice.objects.all()
+        serializer = NoticeSerializer(notices, many=True)
+        return JsonResponse(serializer.data, safe=False)
+
+    elif request.method == 'POST':
+        data = JSONParser().parse(request)
+        serializer = NoticeSerializer(data=data)
+        if serializer.is_valid():
+            serializer.save()
+            return JsonResponse(serializer.data, status=201)
+        return JsonResponse(serializer.errors, status=400)
+
+@csrf_exempt
+def notice_detail(request, id):
+    try:
+        notice = Notice.objects.get(id=id)
+    except Notice.DoesNotExist:
+        return HttpResponse(status=404)
+
+    if request.method == 'GET':
+        serializer = NoticeSerializer(notice)
+        return JsonResponse(serializer.data)
+
+    elif request.method == 'PUT':
+        data = JSONParser().parse(request)
+        serializer = NoticeSerializer(notice, data=data)
+        if serializer.is_valid():
+            serializer.save()
+            return JsonResponse(serializer.data)
+        return JsonResponse(serializer.errors, status=400)
+
+    elif request.method == 'DELETE':
+        notice.delete()
+        return HttpResponse(status=204)
+

templates/base.html

 <html lang="en">
 <head>
     <meta charset="UTF-8">
+    {% load static %}
+    <script src="{% static 'django_eventstream/eventsource.min.js' %}"></script>
+    <script src="{% static 'django_eventstream/reconnecting-eventsource.js' %}"></script>
     <title>{% block title %} {% endblock %}</title>
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha384-HSMxcRTRxnN+Bdg0JdbxYKrThecOKuH5zCYotlSAcp1+c8xmyTe9GYg1l9a69psu" crossorigin="anonymous">
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap-theme.min.css" integrity="sha384-6pzBo3FDv/PJ8r2KRkGHifhEocL+1X2rVCTTkUfGk7/0pbek5mMa1upzvWbrUbOZ" crossorigin="anonymous">
     <script src="https://stackpath.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha384-aJ21OjlMXNL5UyIl/XNwTMqvzeRMZH2w8c5cRVpzpU8Y5bApTppSuUkhZXN0VxHd" crossorigin="anonymous"></script>
+
 </head>
 <body>
 {% block navigation %}

templates/posts/index.html

             </p>
         </div>
 
+    <script>
+        var es = new ReconnectingEventSource('/events/');
+        es.addEventListener('message', function (e) {console.log(e.data);location.reload();}, false);
+    </script>
 
 </form>
 {% endblock %}
 
+
+