[mod_python] [Vampire] Module partially loaded?

Maybe you can force reload by touching the module's modified timestamp ?

Regards,
Nicolas

2005/7/1, Graham Dumpleton <grahamd at dscpl.com.au>:
> 
> On 01/07/2005, at 7:52 AM, Stephane Bortzmeyer wrote:
> 
> > I have a Python module which defines several functions and also
> > includes a bit a code is executed when the module is imported:
> >
> > do_something()
> >
> > def function1():
> >    ...
> >
> > If do_something() fails (it connects to a database and the database
> > server may be down), the rest of the module is not executed, function1
> > is not defined but the module stays loaded: further requests just get
> > a message that there is no function1 defined.
> >
> > Restarting Apache is the only solution to get rid of the partly loaded
> > module.
> >
> > It seems a bug to me: if the module cannot be fully loaded because the
> > initialization code fails, the module should not be loaded at all, so
> > that further attempts have a chance to succeed.
> 
> I'll do some checking, but modules are imported using:
> 
>          # Perform the actual import of the module.
> 
>          try:
>            execfile(file,module.__dict__)
> 
>          except:
>            # Importation of module has failed for some
>            # reason. If this is the very first import of
>            # the module, need to discard the cache entry
>            # entirely else a subsequent attempt to load
>            # the module will wrongly think it was
>            # successfully loaded already.
> 
>            if cache.module is None:
>              del self._cache[label]
> 
>            raise
> 
> Thus, an exception on import is explicitly detected but only
> for the purpose of ensuring that if this is the first time
> that the module is being imported that the cache is cleared
> of the partially constructed entry. If this isn't done then on
> next import attempt it may think it has been loaded and
> module reference will be None.
> 
> In either case, the error is propagated and the failed module
> should be thrown away.
> 
> Is the module the error occurs in being explicitly loaded
> using vampire.importModule() or using the "import" statement
> and relying on the import hook to call vampire.importModule()
> for you? Also, does it happen on the first loading of the
> module or has the module been changed and is it on a reload?
> 
> Graham
> 
> _______________________________________________
> Mod_python mailing list
> Mod_python at modpython.org
> http://mailman.modpython.org/mailman/listinfo/mod_python
>