Zuul Internals
==============

While most people should not need to understand the details of Zuul's internal
data model, understanding the data model is essential for people writing
code for Zuul, and might be interesting to advanced users. The model is
defined in `zuul/model.py`_.

.. _zuul/model.py: http://git.openstack.org/cgit/openstack-infra/zuul/tree/zuul/model.py

Data Model
----------

It all starts with the :py:class:`~zuul.model.Pipeline`. A Pipeline is the
basic organizational structure that everything else hangs off.

.. autoclass:: zuul.model.Pipeline

Pipelines have a configured
:py:class:`~zuul.manager.PipelineManager` which controlls how
the :py:class:`Change <zuul.model.Changeish>` objects are enqueued and
processed.

There are currently two,
:py:class:`~zuul.manager.dependent.DependentPipelineManager` and
:py:class:`~zuul.manager.independent.IndependentPipelineManager`

.. autoclass:: zuul.manager.PipelineManager
.. autoclass:: zuul.manager.dependent.DependentPipelineManager
.. autoclass:: zuul.manager.independent.IndependentPipelineManager

A :py:class:`~zuul.model.Pipeline` has one or more
:py:class:`~zuul.model.ChangeQueue` objects.

.. autoclass:: zuul.model.ChangeQueue

A :py:class:`~zuul.model.Job` represents the definition of what to do. A
:py:class:`~zuul.model.Build` represents a single run of a
:py:class:`~zuul.model.Job`. A :py:class:`~zuul.model.JobTree` is used to
encapsulate the dependencies between one or more :py:class:`~zuul.model.Job`
objects.

.. autoclass:: zuul.model.Job
.. autoclass:: zuul.model.JobTree
.. autoclass:: zuul.model.Build

The :py:class:`~zuul.manager.base.PipelineManager` enqueues each
:py:class:`Change <zuul.model.Changeish>` into the
:py:class:`~zuul.model.ChangeQueue` in a :py:class:`~zuul.model.QueueItem`.

.. autoclass:: zuul.model.QueueItem

As the Changes are processed, each :py:class:`~zuul.model.Build` is put into
a :py:class:`~zuul.model.BuildSet`

.. autoclass:: zuul.model.BuildSet

Changes
~~~~~~~

.. autoclass:: zuul.model.Changeish
.. autoclass:: zuul.model.Change
.. autoclass:: zuul.model.Ref

Filters
~~~~~~~

.. autoclass:: zuul.model.ChangeishFilter
.. autoclass:: zuul.model.EventFilter


Tenants
~~~~~~~

An abide is a collection of tenants.

.. autoclass:: zuul.model.UnparsedAbideConfig
.. autoclass:: zuul.model.UnparsedTenantConfig

Other Global Objects
~~~~~~~~~~~~~~~~~~~~

.. autoclass:: zuul.model.Project
.. autoclass:: zuul.model.Layout
.. autoclass:: zuul.model.RepoFiles
.. autoclass:: zuul.model.Worker
.. autoclass:: zuul.model.TriggerEvent


Testing
-------

Zuul provides an extensive framework for performing functional testing
on the system from end-to-end with major external components replaced
by fakes for ease of use and speed.

Test classes that subclass :py:class:`~tests.base.ZuulTestCase` have
access to a number of attributes useful for manipulating or inspecting
the environment being simulated in the test:

.. autoclass:: tests.base.ZuulTestCase
   :members:

.. autoclass:: tests.base.FakeGerritConnection
   :members:
   :inherited-members:

.. autoclass:: tests.base.FakeGearmanServer
   :members:

.. autoclass:: tests.base.RecordingLaunchServer
   :members:

.. autoclass:: tests.base.FakeBuild
   :members:

.. autoclass:: tests.base.BuildHistory
   :members: