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Thomas De Schampheleire
setup.py: support Paste 3.0.x

In a fresh virtualenv on the stable branch, pastescript 3.0.0 is installed
which depends on paste 3.0.x. Using this virtualenv to upgrade to the
default branch, using 'pip install --upgrade -e .' fails because on the
default branch, the paste version is restricted with '>= 2.0.3, < 3'.
Following error occurs:

pastescript 3.0.0 has requirement Paste>=3.0, but you'll have paste 2.0.3 which is incompatible.
...
Traceback (most recent call last):
File "<string>", line 1, in <module>
File ".../kallithea/kallithea-release/setup.py", line 160, in <module>
""",
File "/usr/lib64/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File ".../kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/develop.py", line 36, in run
self.install_for_development()
File ".../kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/develop.py", line 117, in install_for_development
self.run_command('egg_info')
File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
self.distribution.run_command(command)
File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File ".../kallithea/venv/kallithea-release/lib/python2.7/site-packages/setuptools/command/egg_info.py", line 270, in run
ep.require(installer=installer)
File ".../kallithea/venv/kallithea-release/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2307, in require
items = working_set.resolve(reqs, env, installer)
File ".../kallithea/venv/kallithea-release/lib/python2.7/site-packages/pkg_resources/__init__.py", line 854, in resolve
raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (Paste 2.0.3 (.../kallithea/venv/kallithea-release/lib/python2.7/site-packages), Requirement.parse('Paste>=3.0'))


The '< 3' restriction is introduced with commit
e1ab826131334150b1f003e26de3207c34fc6e67 in January 2017, at which point
2.0.3 was the latest version. Version 3.0.0 was introduced in October 2018.

Paste has a new maintainer and moved to github, after years of
inactivity (March 2016 -> Oct 2018). There have AFAICS not been
incompatible changes. This analysis is based on:
- the news file: https://pythonpaste.readthedocs.io/en/latest/news.html
- the commit message of the 3.0.0 release:
(https://github.com/cdent/paste/commit/9ceef07267ba83ea5c00533f85f9edf9ba38cd71)

"This is for the sake of getting something out there, including
fixes to get stuff working with Python 3.7."

- and a walk through the commits since 2.0.3 on github
(https://github.com/cdent/paste/commits/master).
.. _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.