[Twisted-Python] Re: Wrapping functions that return deferreds

[Ross Burton]

On Wed, 2007-04-11 at 12:05 +0200, Antoine Pitrou wrote:
> Le mercredi 11 avril 2007 à 10:42 +0100, Ross Burton a écrit :
> > def wrap_deferred (func):
> >     def wrapped(*args, **kwargs):
> >         d = func (*args, **kwargs)
> >         d.addErrback (handle_twisted_error)
> >         return d
> >     return wrapped
> > 
> > # flickr is the object, call is the method I'm overriding
> > flickr.call = wrap_deferred (flickr.call)
> > 
> > # Then later in my app
> > flickr.call(foo).addCallback(handleFoo)
> 
> Since you add the errback before adding the callback, errors happening
> in handleFoo will not get caught by the errback.

That is fine -- handleFoo doesn't throw any errors.  The deferred
returned by the original call() is calling errBack().

Ross
-- 
Ross Burton                                 mail: ross at burtonini.com
                                          jabber: ross at burtonini.com
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