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Mads Kiilerich

repo: introduce enable_downloads and enable_statistics when creating repos

These booleans were not shown in the normal repo creation form, so the form
validation applied the "default" values of False. These values were however not
used by the model when creating repos - it just unconditionally used the real
global defaults.

The API already exposed some of this, but it wasn't implemented.

The web form for creating repos lacked these fields, but it was present in the
repo edit form. Just make these fields mandatory. There will thus not be any
defaults to apply in the model for creating repos.

.. _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.