TODO.rst
author Aurelien Campeas <aurelien.campeas@logilab.fr>
Tue, 02 Dec 2014 15:21:29 +0100
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Next steps
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----------
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- finish what was started :
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    - bypass publisher.
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    - tighten the error handling and get a well-behaved application
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    - provide sane default policies that match current cubicweb behavior.
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- identify what can be done without pushing the 'pyramid way' into cubicweb (as
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  a first step for future evolutions).
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Provide a ctl command
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~~~~~~~~~~~~~~~~~~~~~
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Add a 'pyramid' command for cubicweb-ctl that starts a cubicweb instance within
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a pyramid container.
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Transactions
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~~~~~~~~~~~~
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A common transaction handling mechanism should be used so that the connexion
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can be safely used in both pyramid and cubicweb.
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Reimplement the base controllers of cw
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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-   rest
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-   static
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-   data
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Bypass cw.handle_request in most case
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Use it only when no other mean works, which should provide backward compat of
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old cubes for a while.
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Views
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-----
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Goal: Have Cubicweb Views selected by pyramid.
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The selection behavior should be consistent with the cw predicates weight based
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priority system.
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Several approaches should be studied, some less integrated than others.
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Use a ViewMapper
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~~~~~~~~~~~~~~~~
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Here, the idea is to register a single pseudo view for each view __regid__
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present in the CW registry.
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The view mapper associated with these pseudo views would do a view lookup on
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the CW registry first, then call it for rendering.
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Pros
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    *   Easy to implement
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Cons
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    *   Need to keep two registries in the long term
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    *   Two phases lookup: once in pyramid, once in CW.
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    *   A lookup is performed when pyramid assumes it is finished and
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        successful, which means we do not respect the pyramid API (A
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        ViewMapper is just supposed to render an already selected view)
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    *   CW views are not registered directly by pyramid
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I (Christophe) don't like this solution because it is too much of a workaround
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and we would not use the pyramid API, just wrapping stuffs.
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Use a custom IMultiView
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~~~~~~~~~~~~~~~~~~~~~~~
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Implements a IMultiView (see pyramid.config.views.MultiView) that lookups in
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the CW registry in hits __discriminator__.
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One instance of this class would be registered for each __regid__, like with
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the ViewMapper-based solution.
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Pros
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    *   Not too difficult to implement
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    *   Respect more the pyramid API: the lookup is performed at a moment it is
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        expected by pyramid. In the end, pyramid will know the right view, and
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        any other system looking up for a view will find an actual one, not a
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        pseudo one.
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Cons
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    *   The CW views are not registered directly in pyramid
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    *   Still doing two lookups in two different registries.
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Use CW predicates in add_view (basic)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Here we add a "cwselect" predicate to pyramid, that makes it able to evaluate
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the cubicweb predicates.
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Pros
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    *   We by-pass the CW registry
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Cons
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    *   We loose the cw predicate weigths
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Use CW predicates in add_view + total ordering
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Here we choose to drop the runtime evaluation of the predicates weight.
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Instead, we evaluate the weight of a predicate when it matches, and use that to
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sort the views in the registry.
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This would need only a slight change of the pyramid MultiView, which would sort
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the views in this new order we compute instead of the default one.
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To use this system, we would need to duplicate the view registering when the
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expression has some "or" operators in it. The idea is to obtain 'and-only'
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predicate expressions for add_view.
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The only blocking point against that would be if some actual cw predicates
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returns a variable weight depending on the context, because it would make it
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impossible to pre-evaluate an expression weight if it matches.
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Use CW predicates in add_view + cw predicate weight
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Add runtine evalution of predicate weigths into pyramid.
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No real clue on how we can to that (yet), although it will most probably
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involve changes in MultiView.