Extensibility for Context object

[chrisheller]

Are there any thoughts for adding extensibility to the Context object? It would be handy to be able to attach information calculated in a Handler to the Context for a given request.

For simple Handler-s you can just write inline anonymous procs that have visibility to variables calculated in a containing scope, but there's not an (easy) way to do this with a Handler that is not inline. This is especially true if you have multiple things that are being calculated by various Handler-s.

Thanks

[andreaferretti]

One thing that we may do is to change Context to Context[A], where we add a field custom: A, so that one can instantiate whatever context they like. The current context would then become Context[void], for which may add a type alias DefaultContext = Context[void].

Could this work for you? Do you have a concrete example where this necessity shows up, to better understand this use case?

[chrisheller]

That would be great. Being able to attach some application specific context would be useful.

Security is a primary example where this would be helpful, but other things like user preferences, etc. would also be handy to have in a context object once they have been looked up and/or calculated.

Thanks