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Thomas De Schampheleire

admin: fix 'Settings > Visual' form validation after commit 574218777086

Commit 574218777086 introduced a setting for 'SSH Clone URL' in 'Admin >
Settings > Visual' and placed it under a check 'if c.ssh_enabled', which
means that the corresponding form field is not present when SSH is not
enabled.
In this case, when trying to save the form (changing any or none setting),
form validation reports an error 'Missing value' without much detail. At the
top of the HTML document, even before the opening HTML tag, we can see:


<span class="error-message">Missing value</span><br />

Fix this problem by adding a hidden form field for clone_ssh_tmpl, with the
current value from the database, in case SSH is not enabled.

.. _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.