2009/8/11 Haes <[email protected]>:
>
> Hi,
>
> I'm looking to integrate wsgi applications (Django in this case) into
> a legacy PHP web application. The legacy app is way to big to be
> completely rewritten all at once.
>
> Right now there are two wsgi apps installed in two subdirectories and
> more to come. The only way to configure apache was to set up a
> WSGIDaemonProcess for each of the two wsgi apps and point the
> WSGIScriptAlias to the respective subdirectory. That way I'll need at
> least two daemon processes (http and https) for every part I will
> exchange.
You don't need seperate daemon processes for HTTP and HTTPS, you can
share the same one. You can achieve this in two ways.
The first is to make the daemon process globally available by placing
WSGIDaemonProcess directive outside of the VirtualHost container and
then use WSGIProcessGroup to reference the same daemon process group.
Using this first approach means that daemon process is usable from any
VirtualHost, even ones not for the virtual host you need it for, if
hosting many virtual hosts.
The second and which constrains the use of the daemon process group to
virtual hosts with same ServerName, is to place WSGIDaemonProcess
directive in one (not all), of the virtual hosts for that ServerName.
That is, put in in VirtualHost for port 80. Then use WSGIProcessGroup
in VirtualHost for port 80 and 443 and refer to it.
This works because you can use WSGIProcessGroup to reference a daemon
process defined for same ServerName regardless of what port the
VirtualHost is for. Thus can reference across matching VirtualHost
containers.
I actually would have preferred that this only work that way for
80/443, but not possible with the way that Apache works for me to
filter based on anything except ServerName value.
> Is there a way to only set up one set of WSGIDaemonProcess'es and just
> exclude certain path's from this configuration and let them being
> served by mod_php?
As gert said, first step is to use AddHandler to map .wsgi files to
mod_wsgi. You need to go further than that though as you don't want
lots of .wsgi files for each URL. You also don't want to have to add
lots of Alias directives for each PHP script. Instead you want to
route any URLs which don't map to static files or to PHP through to a
single WSGI application. To do that, would use:
Options ExecCGI
AddHandler wsgi-script .wsgi
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ /site.wsgi/$1 [QSA,PT,L]
That is, add a site.wsgi which contains the code to map to your Django
application, with Django code being stored outside of HTTP document
tree somewhere. Whenever Apache can't find a physical resource file,
ie., static file or PHP script, it will send it to Django.
The only trick with this is that because of the rewrite, the
SCRIPT_NAME for Django will include 'site.wsgi', which you don't want
because if you use Django to generate full URLs it will include it.
Thus you want to use a WSGI middleware wrapper to drop that from
SCRIPT_NAME.
import os, sys
sys.path.append('/usr/local/django')
os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings'
import django.core.handlers.wsgi
_application = django.core.handlers.wsgi.WSGIHandler()
import posixpath
def application(environ, start_response):
# Wrapper to set SCRIPT_NAME to actual mount point.
environ['SCRIPT_NAME'] = posixpath.dirname(environ['SCRIPT_NAME'])
if environ['SCRIPT_NAME'] == '/':
environ['SCRIPT_NAME'] = ''
return _application(environ, start_response)
Now, whether the root of the web site will be routed to Django
probably depends on whether you have a resource corresponding to
DirectoryIndex. Can't remember exactly how that works.
Anyway, this is all documented in:
http://code.google.com/p/modwsgi/wiki/ConfigurationGuidelines#The_Apache_Alias_Directive
Have a read of that section, and the remainder of the document, have a
play and come back with any questions or clarifications.
Graham
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