In all of the previous sections you will note that all of the programs used the Request class from the albatross.cgiapp module. The albatross.apacheapp module contains a Request class to allow you to deploy your application using mod_python 4.1. In this section we will modify the popview.py application to deploy it using mod_python.
In theory it is possible to change application deployment method from CGI to mod_python by changing less than 5 lines of code in the entire application. The complete sample program is contained in the samples/popview5 directory. Use the install.py script to install the sample.
cd samples/popview5 python install.py
The new popview.py mainline follows.
from albatross import ModularSessionApp, SessionAppContext
from albatross.apacheapp import Request
import popviewlib
class AppContext(SessionAppContext):
def open_mbox(self):
if hasattr(self.locals, 'mbox'):
return
self.locals.mbox = popviewlib.Mbox(self.locals.username, self.locals.passwd)
def read_msg(self):
if hasattr(self.locals, 'msg'):
return
self.locals.msg = self.locals.mbox[int(self.locals.msgnum) - 1]
self.locals.msg.read_body()
class App(ModularSessionApp):
def __init__(self):
ModularSessionApp.__init__(self,
base_url='popview.py',
module_path='-=-install_dir-=-',
template_path='-=-install_dir-=-',
start_page='login',
secret='-=-secret-=-',
session_appid='popview5')
def create_context(self):
return AppContext(self)
app = App()
def handler(req):
return app.run(Request(req))
The handler() function is called by mod_python when a browser request is received that must be handled by the program.
You also need to create a .htaccess file to tell Apache to run the application using mod_python.
DirectoryIndex popview.py SetHandler python-program PythonHandler popview
Assuming you install the popview sample below the /var/www directory you will need configure Apache settings for the /var/www/alsamp directory:
<Directory /var/www/alsamp/>
AllowOverride FileInfo Indexes
Order allow,deny
Allow from all
</Directory>