Zope 3 at Google App Engine

Zope 3 at Google App Engine Mykola Kharechko © Quintagroup, 2009

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

Google App Engine Features
Python Runtime Environment
WSGI Support
Datastore storage

Google App Engine Limitations
Read only file system
Reduced Standard Library
No C extensions
No zipimport (py_zipimport instead)
Quotas
Timeout (30 sec)

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

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)

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)

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)

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)

Zope 3 disabled packages
zope.app.applicationcontrol
zope.sendmail
zope.rdb

datastorestorage for ZODB
No versions
No UNDO
Datastore transactions synchronized with ZODB tranasactions

Grok at GAE
setuptools dependency (slower then one zip)
Eat more memory then zope 3
slow “martian” package

Demo
http://zope3.gae.quintagroup.com/
http://worldcookery.gae.quintagroup.com/
http://grok-adder.gae.quintagroup.com/

Summary
Workable zope 3 at GAE
Opportunity to run any zope3-based application at GAE

Links
http://projects.quintagroup.com/gae
http://svn.quintagroup.com/gae

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Zope 3 at Google App Engine

by Quintagroup on Mar 05, 2009

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