[mod_python] how to define publisher when page not found

On 16/01/2007, at 9:07 PM, Maksim Kasimov wrote:

>
>
> On 1/15/07, Graham Dumpleton <grahamd at dscpl.com.au> wrote:
> Maksim Kasimov wrote ..
> > hi,
> >
> > in apache conf file i use:
> >
> >     <Directory "/mypath/mydir">
> >         SetHandler python-program
> >         PythonHandler mod_python.publisher
> >     </Directory>
> >
> >
> > there is file:
> >
> > in file  /mypath/mydir/index.py there some functions:
> >
> > def index(req):
> >
> >     return "index"
> >
> >
> > def free(req):
> >
> >     return 'free'
> >
> >
> > def not_found(req):
> >
> >     # some computation
> >     return 'page not found'
> >
> >
> >
> > and every thing is just fine and works as expected:
> >
> >        for http://myhostname.org/mydir/free i can see "free"
> >        for http://myhostname.org/mydir/ i can see "index"
> >
> >
> > my question is: How to get output of "not_found" function for any  
> other
> > uri,
> > such as " http://myhostname.org/mydir/hello" ?
> >
> > many thanks for any advice.
>
> Use the Apache ErrorDocument directive, specifying the URL to the  
> not_found
> function as the argument.
>
> Graham
>
> it is very inconveniently because:
>     1) in the directory "mydir" there can be a lot of *.py scripts  
> (not only index.py), and i need to specify some default handler for  
> each of module in the directory.
>     2) it makes superfluous redirections

But if it is only for not found errors, it wouldn't occur much so why  
would
it matter.

> So my question is still opened.
>
> To provide this, temporary, i've changed resolve_object function in  
> publisher.py from mod_python in that way:
>
>         try:
>             #obj = getattr(obj, obj_str)
>             obj = getattr(obj, obj_str, getattr(obj, '_default'))
>         except AttributeError:
>             raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
>
> than, i will define _default function in my /mypath/mydir/index.py  
> or any other modules in mydir.
>
> i think it is very wrong to change standart libraries, but i did  
> not found the way, how to redifine this behavior in my index.py file.
>
> is it possible to define some function in my module, to make it  
> return default attribute for getattr function?
> or may be, if i dare, to expect such changes as above in future  
> releases of mod_python?

It is unlikely you will see such a feature in future versions of  
mod_python.
I also question why you would want to do that anyway, ie., have a  
separate
not found page for every file resource. Care to explain what you  
thing you
get from it? Maybe you shouldn't be using mod_python.publisher but  
should
be writing a custom dispatcher of your own.

BTW, you could always do the following:

   SetHandler mypublisherwrapper

Then in handler() of mypublisherwrapper do something like (untested):

   from mod_python import apache, publisher

   def handler(req):
     try:
       result = publisher.handler(req)
     except SERVER_RETURN, value:
             try:
                 if len(value.args) == 2:
                     raise
                 else:
                     result = value.args[0]

      if result == apache.HTTP_NOT_FOUND:
         req.filename = req.filename + '/err404'
         req.path_info = ''
         result = publisher.handler(req)

     return result

although I wouldn't recommend it.

Anyway, please explain why as there is probably a better way of doing  
it but
not knowing what you are trying to achieve makes it very hard to suggest
anything.

Graham
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