[Cubicweb] CubicWeb 3.24 release

Denis Laxalde denis.laxalde at logilab.fr
Mon Nov 21 09:52:55 CET 2016


Hi,

I am pleased to announce the release of CubicWeb 3.24. Many thanks to
contributors of this release which, according to Mercurial, are: Adrien
Di Mascio, Aurelien Campeas, David Douard, Denis Laxalde, Florent Cayré,
Laura Médioni, Sylvain Thénault and Yann Voté.

Main changes in this release are listed below and are also available at
http://cubicweb.readthedocs.io/en/3.24/changes/3.24/.

Packaging notes
---------------

Also note that a significant rework of the packaging was conducted in
this release cycle.

On Python side, we completely switched to using setuptools and added
"extras" declarations to handle recommended dependencies (quite useful
for `pip install cubicweb[pyramid]`).

On Debian side, the binary packages name now includes the "python-"
prefix (e.g. "python-cubicweb", "python-cubicweb-twisted", etc.), in
preparation for support of Python 3 in the Debian packaging. The
Python library is no longer splitted into multiple binary packages and
completely lives in the "python-cubicweb" binary package.

New features
------------

* Various bits of a CubicWeb application configuration can be now be
   overridden through environments variables matching configuration option
   names prefixed by ``CW_`` (for instance ``CW_BASE_URL``).

* Cubes are now standard Python packages named as ``cubicweb_<cubename>``.
   They are not anymore installed in ``<prefix>/share/cubicweb/cubes``. 
Their
   discovery by CubicWeb is handled by a new setuptools entry point
   ``cubicweb.cubes``. A backward compatibility layer is kept for "legacy"
   cubes.

* Pyramid support made it into CubicWeb core. Applications that use it
   should now declare the `cubicweb[pyramid]` dependency instead of
   `cubicweb-pyramid`.

* New `NullStore` class in ``cubicweb.dataimport.stores`` as new base 
class for
   every store, and allowing to test your dataimport chain without actually
   importing anything.


Major changes
-------------

There has been several important changes to the core internals of CubicWeb:

* Dropped `asource` and `extid` columns from the `entities` table as 
well as the
   index on the `type` column, for a sensible optimization on both 
massive data
   insertion and database size / index rebuilding.

* Dropped the `moved_entities` table and related mecanism to remember 
that an
   entity has been moved from a source to the system database - this is 
now the
   responsability of source's parser to detect this (usually by 
remembering its
   original external id as `cwuri`).

* Dropped the original 'give me an eid for this extid, but call me back on
   another line if it has to be created' mecanism on which the 
``cwxmlparser`` was
   relying, in favor of parsers using the dataimport API. This includes 
dropping
   the ``cwxmlparser``. If you're using it, you'll have to write a specific
   parser, examples to come.

* Dropped source mapping handling (schema, views, logic) with its client
   the ``cwxmlparser``. This is not worth the burden, specific parsers 
should be
   preferred.

The above changes lead to the following API changes:

* `req.entity_metas(eid)` doesn't return anymore a 'type' nor 'source' 
keys, use
   `req.entity_type(eid)` instead or 'cw_source' relation to get those
   information,

* deprecated `entity.cw_metainformation()`, which doesn't return anymore 
it's
   'source' key,

* dropped `repository.type_and_source_from_eid(eid, cnx)`,
   `repository.extid2eid(...)` and `source.eid_type_source(cnx, eid)`,

* dropped `source.support_entity(etype)` and 
`source.support_relation(rtype)`,

* dropped 'cw_source' key from default JSON representation of an entity,

* dropped `source_uris()` and `handle_deletion(...)` method from 
datafeed parser
   base class, deletion of entities is now the responsability of specific
   implementation (see ``ldapparser`` for example),

* entities from external source are always displayed in the UI with a link
   to the local entity, not the original one simplifying 
`entity.absolute_url()`
   implementation and allowing to drop `use_ext_eid` argument of
   `entity.rest_path()` (though it's still supported for backward compat).


Changes to the massive store
-----------------------------

Several improvments have been done to ``cubicweb.dataimport.massive_store``,
with among the more important ones:

* Extended store API to provide more control to end-users:
   `fill_entities_table`, `fill_relation_table`, `fill_meta_relation_table`.

* Dropped `on_commit` / `on_rollback` arguments of the constructor.

* Use a slave specific temporary table for entities insertion as for 
relations
   (should improve concurrency when using in master/slaves mode).

* Delay dropping of constraint to the `finish` method, avoiding performance
   problem that was occuring because indexes were dropped at store 
creation time.

* Consider the given metadata generator when looking for which metadata 
tables
   should have their constraints dropped.

* Don't drop index on `entities.eid`, it's too costly to rebuild on database
   with some million of entities.

-- 
Denis Laxalde
Logilab         http://www.logilab.fr



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