使用Django创建Google App Engine应用

views.py
def add_post(request): if request.method == 'GET': form = PostForm() if request.method == 'POST': form = PostForm(request.POST) if form.is_valid(): post = form.save() post.author = users.get_current_user() post.put() return HttpResponseRedirect('/post/add/') return render_to_response('blog/add_post.html', {'form': form}, context_instance=RequestContext(request))
')
forms.py
from google.appengine.ext.db import djangoforms as forms from models import Post class PostForm(forms.ModelForm): class Meta: model = Post exclude = ['author']
•
为
Django
webapp
• Google App Engine Helper for Django • •
项 项
Blog 统 OnlyPython
创
• • •
发环
载Google App Engine SDK /appengine/downloads.html SVN 载 Django 码
urls.py
from django.conf.urls.defaults import * urlpatterns = patterns('onlypy.blog.views', (r'^post/add/$', 'add_post'), )
Run
• cd /yourpath/onlypython/ • python ./manage.py runserver 127.0.0.1:8000
import os import sys import logging from appengine_django import InstallAppengineHelperForDjango InstallAppengineHelperForDjango() # Google App Engine imports. from google.appengine.ext.webapp import util # Import the part of Django that we use here. import django.core.handlers.wsgi def main(): # Create a Django application for WSGI. application = django.core.handlers.wsgi.WSGIHandler() # Run the WSGI CGI handler with that application. util.run_wsgi_app(application) if __name__ == '__main__': main()
load balancing
运
• Python 2.5.2 • •运 • •应
环
CGI WSGI 访问 cron job 须 response C 扩 创 统 进
Django 0.96.1 CGI Sandbox socket 时间 须
纯Python
储 Datastore
• • • • • • •
Google BigTable 对 Model 查询 务 储过 记录 库 储 务 ORM
join, sum, avg 查询 检 1000
App Engine Service
• Google帐 • Gmail
认证
发 email
• URL Fetch • Memcached • Image (PIL)
settings.py
TIME_ZONE = 'UTC' MIDDLEWARE_CLASSES = ( 'monMiddleware', 'appengine_django.auth.middleware.AuthenticationMiddleware', ) ROOT_URLCONF = 'urls' ROOT_PATH = os.path.dirname(__file__) TEMPLATE_DIRS = ( os.path.join(ROOT_PATH, 'onlypy/templates') ) INSTALLED_APPS = ( 'appengine_django', 'django.contrib.auth', 'onlypy.blog', )
录结构
录) js, css, 图 ) ) ) ) ) )
--- appengine-django (app engine helper for django
--- app.yaml (app engine --- index.yaml (app engine --- main.py (app engine 启动 --- manage.py (Django --- settings.py (项 --- urls.py (URL mapping)
(
Fixed Quota
费
)
Per Day Usage Quotas
约500
PV/
费
• $0.10 - $0.12 per CPU core-hour • $0.15 - $0.18 per GB-month of storage • $0.11 - $0.13 per GB outgoing bandwidth • $0.09 - $0.11 per GB incoming bandwidth
TODO:
Blog
models.py
from google.appengine.ext import db class Category(db.Model): name = db.StringProperty() def __str__(self): return class Post(db.Model): author = erProperty() title = db.StringProperty(required=True, verbose_name=u'标题') tag = db.StringProperty(verbose_name=u'标签') content = db.TextProperty(required=True, verbose_name=u' ') create_time = db.DateTimeProperty(auto_now_add=True) update_time = db.DateTimeProperty(auto_now=True) category = db.ReferenceProperty(Category, required=True, verbose_name=u' is_published = db.BooleanProperty(verbose_name=u' 发 def get_absolute_url(self) : return '/post/%s/'%self.key().id() ')
请Google App Engine
• / • • • •
过Gma
习Web 发 idea, scalability问题 startup
• 尝试 •
app.yaml
application: onlypython version: 1 runtime: python api_version: 1 handlers: ‐ url: /static static_dir: static ‐ url: /.* script: main.py
main.py
/svn/django/trunk/ 载Google App Engine Helper for Django /p/google-app-engine-django/
项
--- django (django --- onlypy (项 --- static ( 态 码 录) 录 录)
index.yaml
indexes: ‐ kind: Post properties: ‐ name: is_published ‐ name: create_time direction: desc
• App Gallery /
计
•对 • • • •
线处 导 /导 费计 传 载 语
Django简
Django简
•
Python full-stack Web
• ORM, URL mapping, admin interface,
template, middleware, i18n, cache...
Django创 Google App Engine应
胜 @
• Google App Engine • Django •
码 绍
绍
Google App Engine 绍
Google App Engine
• Google • • • •
Web Hosting 务 Google 动Scaling 储 务 Google User认证 Gmail 务 础设 Web应 应