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Mads Kiilerich
celery: fix send_email to work with JSON encoding (Issue #363)

Long time ago, c935bcaf7086 introduced an optional User object parameter to the
send_email task and used the computed full_name_or_username property. Due to the
magic of pickle, that also worked when using Celery to run the task async.

Now, Celery 4 changed the default encoding from Pickle to JSON, which we
anticipated in e539db6cc0da. That broke send_email in some cases, for example
when a user comments on another user's changeset.

Fixed by passing the "From" name as string instead of passing the whole User
object.

Thanks to vyom for reporting.
.. _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.