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Swift
=====
A distributed object storage system designed to scale from a single
machine to thousands of servers. Swift is optimized for multi-tenancy
and high concurrency. Swift is ideal for backups, web and mobile
content, and any other unstructured data that can grow without bound.
Swift provides a simple, REST-based API fully documented at
http://docs.openstack.org/.
Swift was originally developed as the basis for Rackspace's Cloud Files
and was open-sourced in 2010 as part of the OpenStack project. It has
since grown to include contributions from many companies and has spawned
a thriving ecosystem of 3rd party tools. Swift's contributors are listed
in the AUTHORS file.
Docs
----
To build documentation install sphinx (``pip install sphinx``), run
``python setup.py build_sphinx``, and then browse to
/doc/build/html/index.html. These docs are auto-generated after every
commit and available online at
http://docs.openstack.org/developer/swift/.
For Developers
--------------
The best place to get started is the `"SAIO - Swift All In
One" <http://docs.openstack.org/developer/swift/development_saio.html>`__.
This document will walk you through setting up a development cluster of
Swift in a VM. The SAIO environment is ideal for running small-scale
tests against swift and trying out new features and bug fixes.
You can run unit tests with ``.unittests`` and functional tests with
``.functests``.
If you would like to start contributing, check out these
`notes <CONTRIBUTING.md>`__ to help you get started.
Code Organization
~~~~~~~~~~~~~~~~~
- bin/: Executable scripts that are the processes run by the deployer
- doc/: Documentation
- etc/: Sample config files
- swift/: Core code
- account/: account server
- common/: code shared by different modules
- middleware/: "standard", officially-supported middleware
- ring/: code implementing Swift's ring
- container/: container server
- obj/: object server
- proxy/: proxy server
- test/: Unit and functional tests
Data Flow
~~~~~~~~~
Swift is a WSGI application and uses eventlet's WSGI server. After the
processes are running, the entry point for new requests is the
``Application`` class in ``swift/proxy/server.py``. From there, a
controller is chosen, and the request is processed. The proxy may choose
to forward the request to a back- end server. For example, the entry
point for requests to the object server is the ``ObjectController``
class in ``swift/obj/server.py``.
For Deployers
-------------
Deployer docs are also available at
http://docs.openstack.org/developer/swift/. A good starting point is at
http://docs.openstack.org/developer/swift/deployment\_guide.html
You can run functional tests against a swift cluster with
``.functests``. These functional tests require ``/etc/swift/test.conf``
to run. A sample config file can be found in this source tree in
``test/sample.conf``.
For Client Apps
---------------
For client applications, official Python language bindings are provided
at http://github.com/openstack/python-swiftclient.
Complete API documentation at
http://docs.openstack.org/api/openstack-object-storage/1.0/content/
--------------
For more information come hang out in #openstack-swift on freenode.
Thanks,
The Swift Development Team
|
