Zope 3 at Google App Engine
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This document discusses the integration of Zope 3 with Google App Engine (GAE), highlighting its features and limitations. It emphasizes GAE's constraints such as a read-only file system and reduced standard library, as well as specific challenges faced by Zope 3 like long startup times and certain package restrictions. The summary also notes refactored Zope packages and links to demos and additional resources.
Zope 3 at Google App Engine
- 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 App Engine 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 С) 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