Proxying every function in a module

[Steve Holden]

> Kind and wise fellows,
> 
> I've got a web application with the following structure:
> 
> 1) module of 100 functions corresponding to user actions (e.g. 
> "update_profile()", "organisations_list()")
> 2) a wsgi callable which maps urls to functions eg 
> /organisations/list/?sort=date_created is mapped to 
> organisations_list("dateCreated")
> 3) mapping is performed using inspect.getargspec()
> 4) a bunch of html generating templates
> 
> In the templates I want to generate urls by referencing the function to 
> which they map, rather than the url, e.g.
> 
> <a href="${organisations_list('dateCreated'})'">Sort By Date Created</a>
> 
> In other words, I want to always refer to functions, rather than mixing 
> up function calls and urls
> 
> I would like a class that proxies all the 100 functions in the user 
> actions module. When a proxied function is called via this class it 
> should return the url to which it is mapped rather than executing the 
> user action function.
> 
> <a href="${proxyclass.organisations_list('dateCreated')}">Sort By Date 
> Created</a>
> 
> should produce:
> 
> <a href="/organisations/list/?sort=date_created">Sort By Date Created</a>
> 
> Obviously, I don't want to write and maintain copies of these 100 
> functions in another class.
> 
> My question is therefore: what is the best way to proxy these 100 functions?
> 
> Thanks
> 
First off, don't attempt to start a new thread by replying to a previous 
one. Many newsreaders will merge the two, confusing the hell out of 
everyone and generally not helping.

Second, what makes you think you need a module? I'd have thought an 
instance of some user-defined class would have been better, as that way 
you can redefine the __getattr__() method to return appropriate functions.

This seems to work, though I haven't tested it extensively (i.e. I have 
called one instance precisely  once ;-)

 >>> import re
 >>> pat = re.compile("([a-z]+)(.+)")
 >>> class myRewriter:
...   def srt(self, s):
...     m = pat.match(s)
...     if not m: raise ValueError(s)
...     return m.group(1), m.group(2).lower()
...   def __getattr__(self, name):
...     n1, n2 = name.split("_")
...     def f(val):
...       s1, s2 = self.srt(val)
...       return "/%s/%s/?sort=%s_%s" % \
...               (n1, n2, s1, s2)
...     return f
...
 >>> r = myRewriter()
 >>> r.organisations_list('dateCreated')
'/organisations/list/?sort=date_created'
 >>>

regards
  Steve
-- 
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