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Google App Engine and Django both have the ability to use the WSGI standard to run applications. As a result, it is possible to use nearly the entire Django stack on Google App Engine, including middleware. As a developer, the only necessary adjustment is modifying your Django data models to make use of the Google App Engine Datastore API to interface with the fast, scalable Google App Engine datastore. Since both Django and Google App Engine have a similar concept of models, as a Django developer, you can quickly adjust your application to use our datastore.
Google App Engine includes Django 0.96, so if you are on the latest stable release, there's nothing to install. Just import your Django modules as you would normally. We cover the modifications you will need to include if you are using the Django development version as well.
main.py
To get your Django application launched using the WSGI handler, it's just a few simple steps. Import util
from google.appengine.ext.webapp
, and the WSGI handler module from Django. Also, instead of handling exceptions using manage.py
, we can log all exceptions with Google App Engine, and the logs will be viewable in the Admin console. For more information on logging with Google App Engine, you can read our article here.
import logging, os # Google App Engine imports. from google.appengine.ext.webapp import util # Force Django to reload its settings. from django.conf import settings settings._target = None # Must set this env var before importing any part of Django os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' import logging import django.core.handlers.wsgi import django.core.signals import django.db import django.dispatch.dispatcher def log_exception(*args, **kwds): logging.exception('Exception in request:') # Log errors. django.dispatch.dispatcher.connect( log_exception, django.core.signals.got_request_exception) # Unregister the rollback event handler. django.dispatch.dispatcher.disconnect( django.db._rollback_on_exception, django.core.signals.got_request_exception) 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()
Additionally, the app.yaml
file for your Google App
Engine application should look like this:
application: my_application version: 1 runtime: python api_version: 1 handlers: - url: /static static_dir: static - url: /.* script: main.py
You can store the CSS, images, and other static content in your static directory.
To use the development version, download the entire Django project, and include it in your application's top level directory. To reduce the number of files you deploy to Google App Engine, you can remove the following directories in your Django folder:
django/bin django/contrib/admin django/contrib/auth django/contrib/databrowse django/test
You will need to modify your main.py to remove the standard version of Django and load the copy you included with your application:
import logging, os, sys # Google App Engine imports. from google.appengine.ext.webapp import util # Remove the standard version of Django. for k in [k for k in sys.modules if k.startswith('django')]: del sys.modules[k] # Force sys.path to have our own directory first, in case we want to import # from it. sys.path.insert(0, os.path.abspath(os.path.dirname(__file__))) # Must set this env var *before* importing any part of Django os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' import django.core.handlers.wsgi import django.core.signals import django.db import django.dispatch.dispatcher def log_exception(*args, **kwds): logging.exception('Exception in request:') # Log errors. django.dispatch.dispatcher.connect( log_exception, django.core.signals.got_request_exception) # Unregister the rollback event handler. django.dispatch.dispatcher.disconnect( django.db._rollback_on_exception, django.core.signals.got_request_exception) 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()
Since App Engine does not support Django models, leave all DATABASE_* settings set to an empty string. The authentication and admin middleware and apps should be disabled since they require Django models. The functionality these provide is covered by the App Engine Users API and Admin Console respectively. Sessions also depend on Django models and must be disabled as well. Finally, you need to replace references to 'project.app' with just 'app' and set the path to your template directory dynamically.
import os ROOT_URLCONF = 'urls' # Replace 'project.urls' with just 'urls' MIDDLEWARE_CLASSES = ( 'django.middleware.common.CommonMiddleware', # 'django.contrib.sessions.middleware.SessionMiddleware', # 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.middleware.doc.XViewMiddleware', ) INSTALLED_APPS = ( # 'django.contrib.auth', 'django.contrib.contenttypes', # 'django.contrib.sessions', 'django.contrib.sites', ) ROOT_PATH = os.path.dirname(__file__) TEMPLATE_DIRS = ( # Put strings here, like "/home/html/django_templates" or # "C:/www/django/templates". Always use forward slashes, even on Windows. # Don't forget to use absolute paths, not relative paths. ROOT_PATH + '/templates', )
Google App Engine's SDK includes the web development server
dev_appserver.py
that you can use to deploy your
application to the Google App Engine development environment. Also,
there is no need to use manage.py
to sync your database when using the Google App Engine datastore.
That's it! You can now build your application as you normally would using Django.