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Mads Kiilerich
utils: when building a Mercurial ui object with configuration, don't use 'None' for NULL values

If Ui had an entry with
ui_section='extensions', ui_key='largefiles', ui_value=NULL
it would be passed to Mercurial as if the .ini file had
[extensions]
largefiles = None
and it would fail to load the largefiles extension because it couldn't find
'./None/'.

Note: get_current_revision might currently mask this problem. It will not get
the Ui from the database and will thus read a normal .ini file from the system
and (if configured) read the largefiles extension from the default location.
That will make the largefiles extension available for later largefiles imports
even if they specify the bogus path.

As f8a714c2c5a1 noted in a FIXME: ui_value should perhaps not be nullable.

For now, just handle NULL in extension configuration.
.. _statistics:

=====================
Repository statistics
=====================

Kallithea has a *repository statistics* feature, disabled by default. When
enabled, the amount of commits per committer is visualized in a timeline. This
feature can be enabled using the ``Enable statistics`` checkbox on the
repository ``Settings`` page.

The statistics system makes heavy demands on the server resources, so
in order to keep a balance between usability and performance, statistics are
cached inside the database and gathered incrementally.

When Celery is disabled:

  On each first visit to the summary page a set of 250 commits are parsed and
  added to the statistics cache. This incremental gathering also happens on each
  visit to the statistics page, until all commits are fetched.

  Statistics are kept cached until additional commits are added to the
  repository. In such a case Kallithea will only fetch the new commits when
  updating its statistics cache.

When Celery is enabled:

  On the first visit to the summary page, Kallithea will create tasks that will
  execute on Celery workers. These tasks will gather all of the statistics until
  all commits are parsed. Each task parses 250 commits, then launches a new
  task.