Introduction To Google App Engine

Google App Engine
Kosei Moriyama (cou929)
Nov, 23, 2009

Wednesday, May 5, 2010

Agenda

• Google App Engine
• Getting Started
•


Google App Engine


•
•
•
•
•
•
•

• …


App Engine
•
•
•
•
•
•
•
• …


• Python

• Java

• JVM

• e.g., JRuby
•
•
• App Engine

• Google , URL Fetch, Mail, memcache,

• Cron


• App Engine SDK

• web

• app engine

• Python SDK / Java SDK
• google


Getting Started


•
• http://code.google.com/intl/ja/appengine/docs/python/gettingstarted/


•
• Hello World!
• Webapp

• Google

•
•
•
•
•


• Python

• http://www.python.org/download/
• 2.5

• 3.x

• Python SDK

• http://code.google.com/intl/ja/appengine/
downloads.html
• Path


• dev_appserver.py
•
• appcfg.py
• app engine


Hello World!

•
• app.yaml

• python main.py


app.yaml

•
• id, version, runtime ...
•
• url


main.py

• print


App Engine web

•


App Engine web

• app engine web
CGI

request CGI
app.yaml

app engine routing
client
web server
response CGI
foo.py bar.py baz.py


Webapp
• CGI
‣ ,

• Python CGI

• Django, Cherry.py, Pylons, web.py

Webapp

•
•
• app engine


3
• RequestHandler ( )

• ,

• WSGIApplication

• URL

• main

• CGI WSGIApplication


main.py
• webapp, run_wsgi_app

• MainPage

• webapp.RequestHandler

• def get(self)
• GET

• response.headers()
• response.out.write()
• webapp.WSGIApplication()
• run_wsgi_app()


Google

• users import

• user.get_current_user()
• user

• none

• self.redirect(dest_uri)
• dest_uri

• users.create_login_url(dest_uri)
•
• , dest_uri


• def post(self)
• POST
• request.get(‘name’)
• “name”


•
•
•
• not RDBMS


Entity
put()

application Data Store

List of Entity
GQL


Entity
• Entity
• db.Model

• Property key

• Property
• db.fooProperty()

• Key
• entity

• Data store


class Pet(db.Model):
name = db.StringProperty(required=True)
type = db.StringProperty(required=True, choices=set(["cat", "dog", "bird"]))
birthdate = db.DateProperty()
weight_in_pounds = db.IntegerProperty()
spayed_or_neutered = db.BooleanProperty()
owner = db.UserProperty(required=True)


• , put()

•
greeting = Greeting(author = users.get_current_user(), content =
self.request.get('content'))

greeting.put()


GQL
• db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC LIMIT 10")

• greetings Greeting

• for greeting in greetings:

•
• db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC
LIMIT 10")

• Greeting.gql("ORDER BY date DESC LIMIT 10")

• "SELECT * FROM Greeting" ( )


• Greeting.all()
greetings.ﬁlter("author =",
users.get_current_user())
greetings.order("-date")
•
• Greeting.all().ﬁlter("author =", users.get_current_user()).order("-date")


• EZT, Cheetah, ClearSilver, Quixote, Django
• Django


• template html
• template import
• template Dictionary
• template.render(path, values)


Django template
• {{ variable }}

• {% foo %}

• {% for * %}
• {% if * %}
• {% include * %}


template

• Django template
• class template
• {% extends foo.html %}
• {% block bar %}


• index.html ,

• ok

•

• , css, JavaScript, , Flash


app.yaml
- url: /stylesheets
static_dir: stylesheets

• /stylesheets/*
, stylesheets


•
• http://appengine.google.com/
• app.yaml

• application: ID

•
• appcfg.py update helloworld/
•
• http://application-id.appspot.com


• memcache
• URL Fetch
• Mail
•
• Cron ( )

•

memcach

•
• memchached
• key-value store


URL Fetch

• HTTP/HTTPS ,

/

• Google ,


• urllib, urllib2, httplib
• google

• app engine api


Mail

•


•
•
• 1

•
•
• ( )


Cron

•
• cron.yaml


cron.yaml
cron:
- description: daily summary job
url: /tasks/summary
schedule: every 24 hours
- description: monday morning mailout
url: /mail/weekly
schedule: every monday of month 09:00
timezone: Australia/NSW


• every 5 minutes
• every 12 hours
• 2nd,third mon,wed,thu of march 17:00
• every monday of month 09:00
• 1st monday of sep,oct,nov 17:00


app.yaml

handlers:
- url: /report/weekly
script: reports.py
login: admin


• pure python ok

•
•
• Antlr 3
• Django 0.9.6
• PyCrypto
• WebOb
• YAML
• zipimport


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