[mod_python] Child process init handler

Michael C. Neel neel at mediapulse.com
Tue Jan 27 13:17:15 EST 2004

I do this now for db connections:

def db_connect(db="", user="", passwd="", host=""):
    global connection
        db = connection
        return db
    except NameError:
        connection = MySQLdb.connect( db=db, user=user, passwd=passwd,

    return connection

(course this won't work in a 2.0 threaded MPM, as MySQLdb cursors are
one-one with db connections).

What I'm wanting to do as well is init my albatross app once to take
advantage of it's template and page module caching.

I admit this is an area where python starts to get fuzzy for me, so I'm
not even sure if the above code is doing what I think it is.  I can
write an app wrapper like the one above for albatross no sweat, just if
someone can give me a reassurance this is working like I think I'd feel
better =)


> -----Original Message-----
> From: Daniel West [mailto:dwmp at opti.cgi.net] 
> Sent: Tuesday, January 27, 2004 12:54 PM
> To: mod_python at modpython.org
> Subject: Re: [mod_python] Child process init handler
> Mike,
> Unfortunately mod_python is a little lacking when it comes to 
> initialization capabilities.  If you've missed something in 
> the docs then 
> I've missed it too.  As it turns out, it's not such a bad thing to do 
> initialization on the first request.  Subsequent requests run 
> in the same 
> post-initialized environment (interpreter).  For instance, 
> make a db module 
> for your database interface.  On the first request, make a database 
> connection and store the connection object in the database 
> module.  On the 
> next request, your database connection will still be there, 
> alive and ready 
> to use.
> I think it would be very nice, convenient and helpful to new 
> developers to 
> have PythonImport work under virtual domains and to provide a 
> method for 
> accessing the PythonOptions of the domain under which 
> PythonImport was 
> called.  I know I spent several frustrating evenings, while taking up 
> mod_python, trying to figure out how to make initialization 
> work elegantly.
> -Dan
> At 11:55 AM 1/27/2004 -0500, you wrote:
> >What I want to do:
> >
> >         Run some initialization code when Apache spawns the child
> >process.  I do not want to call this handler for every 
> request, but I do
> >want to have access to the configuration, specifically PythonOptions
> >
> >In looking though the docs, I'm not sure PythonInitHandler works this
> >way, and PythonImport may not be able to access the PythonOption
> >directives.  Is there something I'm overlooking?
> >
> >Mike
> >
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