Google App Engine for Python - Unit01: Basic
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The document provides a comprehensive overview of Google App Engine (GAE), detailing its functionalities, supported languages (such as Python, Java, PHP, and Go), and how to set up and deploy web applications. It includes instructions on setting up a development environment, configuring project structures, and using Google User Service for user management. Additionally, it offers code examples and deployment steps to facilitate the creation and launch of applications on the GAE platform.
![Module: helloworld. py
• import webapp2
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.headers['Content-Type'] = 'text/ html'
self.response.write('Hello, World!')
app = webapp2.WSGIApplication([
('/', MainPage),
], debug=True)
• For security issue, you should disable debug which will display a
stack trace in the browser when a handler raises an exception.
Ubiquitous Computing and Ambient Networking Laboratory 10](https://image.slidesharecdn.com/gaepythonbasic-140630015034-phpapp01/85/Google-App-Engine-for-Python-Unit01-Basic-10-320.jpg)
![Google User Service
• Google user service (https://developers.google.com/appengine/docs/python/users/)
• Import user service module
– from google.appengine.api import users
• Get current user
– user = users.get_current_user() # Google Account, Google Apps Account, OpenID
• Access user information
– user.nickname()
– user.email()
– user.user_id()
• Administrator check
– user.is_current_user_admin()
• Create login/logout pages
– users.create_login_url('[destination URL]')
– users.create_logout_url('[destination URL]')
Ubiquitous Computing and Ambient Networking Laboratory 14](https://image.slidesharecdn.com/gaepythonbasic-140630015034-phpapp01/85/Google-App-Engine-for-Python-Unit01-Basic-14-320.jpg)
![Google User Service - Example
• from google.appengine.api import users
import webapp2
class MainPage(webapp2.RequestHandler):
def get(self):
user = users.get_current_user()
if user:
self.response.headers['Content-Type'] = 'text/ html'
self.response.write('Hello, World, %s!<br>', %(user.nickname()))
self.response.write('<a href="%s">Sign Out</a>'
% users.create_logout_url(self.request.url))
else:
self.redirect(users.create_login_url(self.request.url) )
app = webapp2.WSGIApplication([
('/', MainPage),
], debug=True)
Ubiquitous Computing and Ambient Networking Laboratory 15](https://image.slidesharecdn.com/gaepythonbasic-140630015034-phpapp01/85/Google-App-Engine-for-Python-Unit01-Basic-15-320.jpg)
Google App Engine for Python - Unit01: Basic
- 1. Google App Engine (GAE) Wei-Tsung Su (蘇維宗) ellington.su@gmail.com 06/30/2014 (Ver. 1.0) Ubiquitous Computing and Ambient Networking Laboratory 1
- 2. Change Log Date Ver. Authors Description 6/30/2014 1.0 Wei-Tsung Su Google App Engine (GAE); GAE for Python; Using Static Files; Google User Service Ubiquitous Computing and Ambient Networking Laboratory 2
- 3. What? • Google Cloud Platform – App Engine provides Platform as a Service (PaaS) – Compute Engine provides Infrastrcture as a Servce (IaaS) – CloudSQL, Cloud Storage, and Cloud Datastore provide storage options – BigQuery and Hadoop provide big data processing capability • Language supported by GAE – Python, Java, PHP, and GO – Different languages may provide different features. Ubiquitous Computing and Ambient Networking Laboratory 3
- 4. Why? • Easily deploy your web services to public • Seamlessly integrate with other Google services • Free quotas (https://developers.google.com/appengine/docs/quotas) – Code & Static Data Store (1GB free) – Google Cloud Storage (5GB free) – Blobstore Stored Data (5GB free) – API access (which depends on different Google API) – ... Ubiquitous Computing and Ambient Networking Laboratory 4
- 5. How? • Read Support Documentation – https://developers.google.com/appengine/ • Try Administration Console – https://appengine.google.com/ – https://console.developers.google.com • Download SDK – https://developers.google.com/appengine/downloads Start Your Engine 3, 2, 1 Ubiquitous Computing and Ambient Networking Laboratory 5
- 6. GAE for Python Ubiquitous Computing and Ambient Networking Laboratory 6
- 7. Setup Development Environment • Install Python 2.7 – https://www.python.org/download/releases/2.7.7/ • Install App Engine SDK for Python – https://developers.google.com/appengine/downloads – Ex. we assume that google_appengine/ is the SDK directory. • Install Git (optional) – http://git-scm.com/downloads Ubiquitous Computing and Ambient Networking Laboratory 7
- 8. How GAE for Python Works • A Python web app interacts with the App Engine web server using Web Server Gateway Interface (WSGI) protocol. • WSGI-compatible web application frameworks, such as – webapp2 (by default, simple) – Django – CherryPy – Pylons – web.py – web2py Ubiquitous Computing and Ambient Networking Laboratory 8
- 9. Project Structure of GAE for Python • Modules – Dynamic web page generation – http://webapp-improved.appspot.com/ – Filename: xxx.py (ex. helloword.py) • Configuration File – Project configuration – Routing requests to modules – https://developers.google.com/appengine/docs/python/config/appconfig – Filename: app.yaml (壓謀!) • Ex. we assume that helloworld/ is the project directory Ubiquitous Computing and Ambient Networking Laboratory 9
- 10. Module: helloworld. py • import webapp2 class MainPage(webapp2.RequestHandler): def get(self): self.response.headers['Content-Type'] = 'text/ html' self.response.write('Hello, World!') app = webapp2.WSGIApplication([ ('/', MainPage), ], debug=True) • For security issue, you should disable debug which will display a stack trace in the browser when a handler raises an exception. Ubiquitous Computing and Ambient Networking Laboratory 10
- 11. Configuration File: app.yaml • application: your-app-id version: 1 runtime: python27 api_version: 1 threadsafe: true handlers: - url: /.* script: helloworld.app • How to test your project locally – # google_appengine/dev_appserver.py helloworld/ – Test your web app by visiting the URL: http://localhost:8080 Ubiquitous Computing and Ambient Networking Laboratory 11
- 12. Hello, World! Ubiquitous Computing and Ambient Networking Laboratory 12
- 13. Using Static Files • Sometimes, you may put static files, such images, CSS stylesheets, JavaScript code, and so on, into your web applications. • For example, – <img src="/images/logo.png" > • Unfortunately, you cannot just create a directory and put the static files into the directory. • You also need to add route into con figuration file: app.yaml – - url: /images static_dir: images Ubiquitous Computing and Ambient Networking Laboratory 13
- 14. Google User Service • Google user service (https://developers.google.com/appengine/docs/python/users/) • Import user service module – from google.appengine.api import users • Get current user – user = users.get_current_user() # Google Account, Google Apps Account, OpenID • Access user information – user.nickname() – user.email() – user.user_id() • Administrator check – user.is_current_user_admin() • Create login/logout pages – users.create_login_url('[destination URL]') – users.create_logout_url('[destination URL]') Ubiquitous Computing and Ambient Networking Laboratory 14
- 15. Google User Service - Example • from google.appengine.api import users import webapp2 class MainPage(webapp2.RequestHandler): def get(self): user = users.get_current_user() if user: self.response.headers['Content-Type'] = 'text/ html' self.response.write('Hello, World, %s!<br>', %(user.nickname())) self.response.write('<a href="%s">Sign Out</a>' % users.create_logout_url(self.request.url)) else: self.redirect(users.create_login_url(self.request.url) ) app = webapp2.WSGIApplication([ ('/', MainPage), ], debug=True) Ubiquitous Computing and Ambient Networking Laboratory 15
- 16. Hello, World, User! Ubiquitous Computing and Ambient Networking Laboratory 16
- 17. Deploy Your Application • Step 1: Create Project in Developer Console – https://console.developers.google.com – You will get a random project id (Ex. your-app-id). – The public URL of your web application will be • http://your-app-id.appspot.com • Step 2: Check if the application ID in app.yaml matches your-app-id – application: your-app-id • Step 3: Deploy your local project – #google_appengine/appcfg.py update helloworld/ – Test your web app by visiting the URL: http://your-app-id.appspot.com Ubiquitous Computing and Ambient Networking Laboratory 17
- 18. Q&A You can clone the sample code by git clone https://github.com/ucanlab/gae_python_basic_helloworld.git or visiting https://github.com/ucanlab/gae_python_basic_helloworld Ubiquitous Computing and Ambient Networking Laboratory 18