Getting Started with Google Apps

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YAML

builtins:
- datastore_admin: on


Hello World

helloworld.py


#-------------------------------------------------------------------------------

import os
import cgi
import sys

from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext import db
from google.appengine.ext.webapp import template
from google.appengine.ext.webapp.util import run_wsgi_app

#-------------------------------------------------------------------------------

class Greeting(db.Model):
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateTimeProperty(auto_now_add=True)

#-------------------------------------------------------------------------------

class MainPage(webapp.RequestHandler):
    def get(self):
        greetings_query = Greeting.all().order('-date')
        greetings = greetings_query.fetch(10)

        if users.get_current_user():
            url = users.create_logout_url(self.request.uri)
            url_linktext = 'Logout'
        else:
            url = users.create_login_url(self.request.uri)
            url_linktext = 'Login'

        template_values = {
            'greetings': greetings,
            'url': url,
            'url_linktext': url_linktext,
        }

        sys.stderr.write("[%s]\n" % template_values)

        path = os.path.join(os.path.dirname(__file__), 'html', 'index.html')
        sys.stderr.write("[%s]\n" % path)
        self.response.out.write(template.render(path, template_values))

#-------------------------------------------------------------------------------

class Guestbook(webapp.RequestHandler):
    def post(self):
        greeting = Greeting()

        if users.get_current_user():
            greeting.author = users.get_current_user()

        greeting.content = self.request.get('content')
        greeting.put()
        self.redirect('/')

#-------------------------------------------------------------------------------

application = webapp.WSGIApplication(
                                     [('/', MainPage),
                                      ('/sign', Guestbook)],
                                     debug=True)

#-------------------------------------------------------------------------------

def main():
    run_wsgi_app(application)

#-------------------------------------------------------------------------------

if __name__ == "__main__":
    main()

#-------------------------------------------------------------------------------

app.yaml


application: helloworld
version: 1
runtime: python
api_version: 1

handlers:
- url: /css
  static_dir: css

- url: /.*
  script: helloworld.py

index.html

<html>
  <head>
    <link type="text/css" rel="stylesheet" href="/css/main.css" />
  </head>
  <body>
   	<div class="one">
	   	<div class="two">
				{% for greeting in greetings %}
				{% if greeting.author %}
				<b>{{ greeting.author.nickname }}</b> wrote:
				{% else %}
				An anonymous person wrote:
				{% endif %}
				<blockquote>{{ greeting.content|escape }}</blockquote>
				{% endfor %}
				
				<form action="/sign" method="post">
					<div><textarea name="content" rows="3" cols="60"></textarea></div>
					<div><input type="submit" value="Sign Guestbook"></div>
				</form>
			</div>
			<div class="three">
				<a href="{{ url }}">{{ url_linktext }}</a>
			</div>
		</div>
  </body>
</html>

main.css

body {
  font-family: Verdana, Helvetica, sans-serif;
  background-color: #DDDDDD;
}

.one {
	background-color: #BBBBBB;
}

.two {
	background-color: #CCCCCC;
}

.three {
  background-color: #AAAAAA;
}
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