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Thomas De Schampheleire

model: handle redundant reviewers in add_reviewers

Don't attempt to add reviewers that are already a reviewer for the specified
PR (redundant reviewers).

Return the list of added and redundant reviewers, for the controller to
handle.

Under normal circumstances, the pullrequest controller already processes the
list of reviewers and only calls add_reviewers for new reviewers. But, there
could be ways were this checking fails, for example due to a race condition
between two simultaneous requests for the same pullrequest, or due to a bug
in the web server framework that causes the same request to be handled
again.

.. _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.