The document provides a comprehensive guide on setting up and deploying a Django application using Google App Engine (GAE). It includes installation instructions, basic app structure, model and view creation for a blog application, caching mechanisms, and performance testing metrics. Additionally, it discusses integration with non-relational databases and includes code snippets for various functionalities.

1. Django + GAE
@wingchen83

2. WINGCHEN
•
• java compiler (antlr parser generator)
• python
•
• GAE djangoappengine

3. WHY DJANGO
www.djangoproject.com
• / / web framework (me!)
• ruby me!
• python (me!)
• (me!)

4. INSTALLATION
docs.djangoproject.com/en/1.3/intro/install/
• python
• download django official release
• (linux: sudo) python setup.py install

5. FIRST DJANGO APP: A BLOG!!
docs.djangoproject.com/en/1.3/intro/tutorial01
• django-admin.py startproject gtugproj
• Tryit:
python manage.py runserver (8080)

6. DB SETUP
docs.djangoproject.com/en/1.3/intro/tutorial01
• Let’s use sqlite!
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': 'gtugproj.sqlite',
}
}
• Updateit:
python manage.py syncdb
• Voila, the project is UP!

7. COMMENCE THE BLOG APP
• python manage.py startapp blog

8. DJANGO MVC
• Diagram form: metodologiasdesistemas.blogspot.com

9. DJANGO MVC
urls.py/ modles.py
views.py
views.py/
templates
• Diagram form: metodologiasdesistemas.blogspot.com

10. THE BLOG MODEL
docs.djangoproject.com/en/dev/topics/db/models/
from django.db import models
from datetime import datetime
class Blog(models.Model):
blog_id = models.AutoField(primary_key=True)
title = models.CharField(max_length=50)
content = models.TextField()
pub_date = models.DateTimeField(default=datetime.now)

11. THE BLOG VIEW
docs.djangoproject.com/en/dev/topics/db/queries
• Show Blogs:
def blog_view(request):
blogs = Blog.objects.all()
output = ''
output += '<FORM action="blog_add" method="post">'
output += '<INPUT name="title" type="text" id="title"/><BR>'
output += '<textarea rows="10" cols="20" id="content" name="content"></textarea><BR>'
output += '<INPUT type="submit" id="submit" value="Go"/><BR>'
output += '</FORM><br>'
for blog in blogs:
output += 'title:' + blog.title + '<br>'
output += 'pub_date:' + str(blog.pub_date) + '<br>'
output += 'content:' + blog.content + '<br><br>'
return HttpResponse(output, mimetype='text/html')

12. THE BLOG VIEW
docs.djangoproject.com/en/dev/topics/db/queries
• New Blog:
@csrf_exempt
def blog_add(request):
title = request.REQUEST.get('title', 'default title')
content = request.REQUEST.get('content', 'default content')
Blog(title=title, content=content).save()
return redirect('/blog/')

13. THE BLOG CONTROLLER
• gtugproj/urls.py
('^blog/', include('blog.urls')),
• gtugproj/blog/urls.py
('^blog_add', blog_add),
('', blog_view),

14. PUT IT IN SETTINGS.PY
INSTALLED_APPS = (
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.sites',
'blog'
)
• Then: python manage.py syncdb

15. DJANGOAPPENGINE ...
• Django Nonrel
Django
NoSQL Database ORM

16. DJANGO NONREL ?
• Developers Model
• Django ORM
• SQL
• Django-dbindexer
• No-Sql DB Calls

17. DJANGO NONREL?
• non-relational DBs
• PO SQL DBs
• / Denormalization
• querie
• (GAE, etc.)

18. DJANGO NONREL
• GAE
djangoappengine
• MongoDB
MongoDB backend
( LittleQ)

19. DJANGO NONREL
• ElasticSearch
• Cassandra

20. DJANGOAPPENGINE
www.allbuttonspressed.com/projects/djangoappengin
• Django App Engine :
• DB
• Email
• Django Nonrel

21. BLOG APP GAE
• django-nonrel/django => gtugproj/django
• djangotoolbox/djangotoolbox => gtugproj/djangotoolbox
• django-autoload/autoload => gtugproj/autoload
• django-dbindexer/dbindexer => gtugproj/dbindexer
• djangoappengine => gtugproj/djangoappengine

22. • gtugproj/django
• gtugproj/djangotoolbox
• gtugproj/autoload
• gtugproj/dbindexer
• gtugproj/djangoappengine

23. COPY SAMPLE
• app.yaml
• cron.yaml
• index.yaml
• indexes.py
• manage.py (overwrite)

24. SETTINGS.PY
• [please follow up]

25. TRAIL RUN
• python manage.py runserver

26. DEPLOY TO GAE
• GAE APP
• app.yaml
•
python manage.py deploy

27. DJANGOAPPENGINE
• JOIN !! ( , ,JOIN )
• many-to-many
• Aggregates
• transactions
• GAE run_in_transaction()

28. DEPENDENCIES
• source code gtugproj
• 3000
• zip-packages

29. CACHE
• Django memcache module API
• GAE – memcache backend

30. CACHE
•
from django.core.cache import cache
insureme_blog_rss_url = 'http://blog.insureme.com.tw/feeds/posts/default'
def get_blog_rss_feeds():
feeds = cache.get('blog_rss_feeds')
if feeds == None:
refresh_cache_blog_rss_feeds()
return cache.get('blog_rss_feeds')
return feeds

31. CACHE
•
insureme_blog_rss_url = 'http://blog.insureme.com.tw/feeds/posts/default'
def get_blog_rss_feeds():
refresh_cache_blog_rss_feeds()
return cache.get('blog_rss_feeds')

32. CACHE
• ab
- 10 connections 10
- 2000 requests in total 2000 request

33. CACHE
Cache Cache
Concurrency Level: 10 Concurrency Level: 10
Time taken for tests: 590.238 seconds Time taken for tests: 237.262 seconds
Complete requests: 2000 Complete requests: 2000
Failed requests: 1 Failed requests: 0
Write errors: 0 Write errors: 0
Total transferred: 1619817 bytes Total transferred: 1620000 bytes
HTML transferred: 1313809 bytes HTML transferred: 1314000 bytes
Requests per second: 3.39 [#/sec] (mean) Requests per second: 8.43 [#/sec] (mean)
Time per request: 2951.190 [ms] (mean) Time per request: 1186.308 [ms] (mean)
Time per request: 295.119 [ms] (mean, Time per request: 118.631 [ms] (mean,
across all concurrent requests) across all concurrent requests)
Transfer rate: 2.68 [Kbytes/sec] Transfer rate: 6.67 [Kbytes/sec]
received received

34. /
www.allbuttonspressed.com/projects/django-filetransfers
• django-filetransfers
• “filetransfers”
• “filetransfers” INSTALLED_APPS

35. TASKING
bitbucket.org/wkornewald/django-defer
•
•

36. Q&A?
• url: http://techblog.insureme.com.tw
• twitter: wingchen83

37. THANK YOU!!
• url: http://techblog.insureme.com.tw
• twitter: wingchen83