Change Request -- high risk, high reward

[Ricky Zhou]

On 2009-03-14 05:36:27 PM, Toshio Kuratomi wrote:
> Ricky and I have both looked at the code in
> fas/safasprovider.py::SaFasIdentity and think that it's safe to cache
> this.  The TG-1.0.8 saprovider on which safasprovider is based does not
> cache this but I've looked at the code and it seems like their provider
> only uses the variable in question a maximum of two times during a
> request.  The CSRF protection that we've enabled needs to use this
> variable more often.
> 
> Here's the code:
> 
> --- a/fas/safasprovider.py
> +++ b/fas/safasprovider.py
> @@ -65,6 +65,7 @@ class SaFasIdentity(object):
> 
>      def __init__(self, visit_key=None, user=None, using_ssl=False):
>          self.visit_key = visit_key
> +        self._visit_link = None
>          if user:
>              self._user = user
>              if visit_key is not None:
> @@ -201,9 +202,13 @@ class SaFasIdentity(object):
>      ### TG: Same as TG-1.0.8
>      def _get_visit_link(self):
>          '''Get the visit link to this identity.'''
> +        if self._visit_link:
> +            return self.visit_link
I already mentioned this to Toshio, but this line should be changed
to return self._visit_link

>          if self.visit_key is None:
> -            return None
> -        return
> visit_class.query.filter_by(visit_key=self.visit_key).first()
> +            self._visit_link = None
> +        else:
> +            self._visit_link =
> visit_class.query.filter_by(visit_key=self.visi
> t_key).first()
> +        return self._visit_link
>      visit_link = property(_get_visit_link)
> 
> If we were outside of freeze, I would apply this as it is causing issues
> for some of the things that talk to fas (like zodbot and developer
> instances of pkgdb).
+1

As Toshio mentioned, we've looked at the places where this variable is
used, and it should be safe (and easy to revert otherwise).  This will
be a giant performance improvement for code where we call filter_private
on a lot of users (which is a lot of places).

Thanks,
Ricky
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