1. Zope 3 at Google App Engine Mykola Kharechko Quintagroup, 2009

2. Overview

Google App Engine Features

Google App Engine Limitations

Zope 3 Limitations

Zope 3 refactored packages

Zope 3 disabled packages

datastorestorage for ZODB

Grok at GAE

Demo

Summary

3. Google App Engine Features

Python Runtime Environment

WSGI Support

Datastore storage

4. Google AppEngine Limitations

Read only file system

Reduced Standard Library

No C extensions

No zipimport (py_zipimport instead)

Quotas

• Timeout (30 sec)

5. Zope 3 Limitations

Long startup (CPU, timeout, disk-io, ZCML, ZODB connection)

Some packages are written in C

No ZODB storage for Datastore

zope.configuration don't support zipped eggs

6. Zope 3 Refactored packages

RestrictedPython (remove from compiler import * )

persistent (rewrote to python)

BTrees (rewrote only thus classes with is used by zope.catalog, ZODB)

7. Zope 3 Refactored packages

zope.app.container (rewrote ContainedProxyBase from )

zope.app.form (os.path.exists/isfile corrected)

zope.app.onlinehelp (os.path.exists/isfile corrected)

zope.app.pagetemplate (rcompile replaced to compile)

8. Zope 3 Refactored packages

zope.app.publisher (@@SelectedManagementView GAE supports redirects only to absolute URLS )

zope.component (optimization refactoring)

zope.configuration (open replaced to zi_open now eggs can be zipped)

zope.documenttemplate (rcompile to compile)

zope.i18n (os.path corrected)

9. Zope 3 Refactored packages

zope.interface (optimization changes)

zope.session (now sessions is storing in RAM )

zope.pagetemplate (open to zi_open)

zope.proxy (from C to python)

zope.security (rcompile to compile, from c to python)

zope.hookable (from C to python)

10. Zope 3 disabled packages

zope.app.applicationcontrol

zope.sendmail

zope.rdb

11. datastorestorage for ZODB

No versions

No UNDO

Datastore transactions synchronized with ZODB tranasactions

12. Grok at GAE

setuptools dependency (slower then one zip)

Eat more memory then zope 3

slow martian package

13. Demo

http://zope3.gae.quintagroup.com/

http://worldcookery.gae.quintagroup.com/

http://grok-adder.gae.quintagroup.com/

14. Summary

Workable zope 3 at GAE

Opportunity to run any zope3-based application at GAE

15. Links

http://projects.quintagroup.com/gae

http://svn.quintagroup.com/gae