[Twisted-web] Get access to Avatar from Resource object?

[Jacek Furmankiewicz]

Got it. The latter approach makes sense.

Thank you
Jacek

On Mon, Mar 5, 2012 at 12:45 PM, Phil Mayers <p.mayers at imperial.ac.uk>wrote:

> On 05/03/12 15:19, Jacek Furmankiewicz wrote:
> > Hm, I would prefer to avoid that.
> >
> > In my case, the cost of creating a new Resource is high (since it needs
> > to parse all the URLs it can dispatch to for all the REST services),
> > therefore I would prefer to cache a single ReadOnlyResource vs
> > AdminResource (as an example)
>
> If you search the archives, you will find discussions on this.
>
> The general conclusion was: Resource objects should be lightweight and
> fast. If you've got expensive stuff, pre-computer / cache / share /
> whatever, and make your Resource objects talk to the cache.
>
> > and just serve one or the other.
>
> So? Do that:
>
> avatars = {}
>
> class MyRealm:
>   def requestAvatar(...):
>
>     if is_admin(avatarId):
>       if not 'admin' in avatars:
>          avatars['admin'] = MyAdmin()
>       return avatars['admin'], ...
>
> Of course, you'll be re-using the same avatar for all admins, and won't
> be able to distinguish them, or access their usernames.
>
> Alternatively you might have a lightweight resource that just does
> simple authorization / logging, and passes render calls through to the
> heavyweight resource:
>
> class MyAdmin():
>   def render(...):
>     request.username = self.username
>     return CachedHeavyAdmin.render(request, ...)
>
> class MyRealm():
>   def requestAvatar(...):
>     if is_admin(avatarId):
>       r = MyAdmin()
>       r.username = avatarId
>       return r
>
>
>
>
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