Zope 3 and PasteDeploy
zope.paste allows you to deploy the Zope 3 application server on any WSGI-capable webserver using PasteDeploy.
zope.paste allows you to run Zope 3 on any WSGI-capable webserver software using PasteDeploy. For this you will no longer need a Zope 3 instance (though you can still have one), you won’t configure Zope 3 through zope.conf and won’t start it using runzope or zopectl.
Configuring the application
zope.paste provides a PasteDeploy-compatible factory for Zope 3’s WSGI publisher application and registers it in an entry point. We can therefore create a very simple Zope 3 application in a PasteDeploy configuration file (e.g. paste.ini):
[app:main] use = egg:zope.paste site_definition = /path/to/site.zcml file_storage = /path/to/Data.fs devmode = on
In this case, /path/to/site.zcml refers to a site.zcml as known from a Zope 3 instance. You can, for example, put paste.ini into an existing Zope 3 instance, next to site.zcml.
Configuring the ZODB database
Instead of referring to a ZODB FileStorage using the file_storage setting, you can also configure multiple or other ZODB database backends in a ZConfig-style configuration file (much like zope.conf), e.g. the following configures a ZEO client:
<zodb> <zeoclient> server localhost:8100 storage 1 cache-size 20MB </zeoclient> </zodb>
Refer to this file from paste.ini this way (and delete the file_storage setting):
db_definition = db.conf
Configuring the server
In order to be able to use our Zope application, we only need to add a server definition. We can use the one that comes with Paste or PasteScript, rather:
[server:main] use = egg:PasteScript#wsgiutils host = 127.0.0.1 port = 8080
Now we can start the application using the paster command that comes with PasteScript:
$ paster serve paste.ini
WSGI middlewares can be configured like described above or on the PasteDeploy website.
Multiple WSGI applications within Zope 3
If you wanted to host more than one WSGI application there are a couple ways of doing it:
- Using a composite application as described in PasteDeploy.
- Setting up extra IServerType utilities.
I’m going to show you how to do the latter now.
The trick here is that you have the option to use both the zserver and the twisted WSGI servers. zope.paste is just glue code, so we defined a IServerType utility for each, and the only thing special is that the utility name is passed on to the WSGI application factory.
Here’s an excerpt from the configure.zcml as found on this package:
<configure zcml:condition="have zserver"> <utility name="Paste.Main" component="._server.http" provides="zope.app.server.servertype.IServerType" /> </configure> <configure zcml:condition="have twisted"> <utility name="Paste.Main" component="._twisted.http" provides="zope.app.twisted.interfaces.IServerType" /> </configure>
Depending on which server is available, the right IServerType utility is registered. You are encouraged to use the same pattern when defining yours.
So suppose you want to have a second WSGI application. Here’s how you could do it.
Create a new IServerType utility. This excerpt could be added to a configure.zcml in your own package, or to a standalone file in etc/package_includes:
<configure zcml:condition="have zserver"> <utility name="Paste.Another" component="zope.paste._server.http" provides="zope.app.server.servertype.IServerType" /> </configure> <configure zcml:condition="have twisted"> <utility name="Paste.Another" component="zope.paste._twisted.http" provides="zope.app.twisted.interfaces.IServerType" /> </configure>
Change your zope.conf file to define a new server, using the newly-created Paste.Another utility:
<server> type Paste.Main address 8080 </server> <server> type Paste.Another address 8180 </server>
Define a WSGI application Paste.Another in paste.ini:
[pipeline:Paste.Main] pipeline = xslt main [app:main] paste.app_factory = zope.paste.application:zope_publisher_app_factory [filter:xslt] paste.filter_factory = xslfilter:filter_factory [app:Paste.Another] paste.app_factory = zope.paste.application:zope_publisher_app_factory
- Changed support from Python 3.3 to 3.5.
- Dropped Python 2.6 support.
- Added support for Python 3.3.
- Dropped support for Python 2.4 and 2.5.
- Removed support for employing WSGI middlewares inside a Zope 3 application. Only the script-based server startup is now supported.
- Added a new console script to run a paste-configured WSGI server and application.
- Conform to standard ZF project layout.
- Added license and copyright file. Also fixed copyright statement in file headers.
- Added MANIFEST.in and tox.ini.
Add this changelog, reconstructed from svn logs and release dates on PyPI.
Support a ‘features’ config option in the PasteDeploy INI file, which can contain a space-separated list of feature names. These can be tested for in ZCML files with the <directive zcml:condition=”have featurename”> syntax.
Previously the only feature that could be enabled was ‘devmode’ and it had its own option. For backwards compatibility, devmode = on adds a ‘devmode’ feature to the feature list.
- Release as an egg with explicit dependencies for zope.app packages.
- Buildoutify the source tree.
- Extended documentation.
- Added a real PasteDeploy application factory. This allows you to run Zope 3 on any WSGI capable server, without integration code.
- Support for devmode.
- Support multiple databases through a config file (specify db_definition instead of file_storage).
- Accept filenames relative to the location of the PasteDeploy INI file.
- Initial release.
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