8db22bdc1f
Correct documentation link address in README. Change-Id: I1f6ac13eebf05e5deb7fe07ae7a202e1dd4e544a
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155 lines
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========================
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Team and repository tags
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========================
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.. image:: https://governance.openstack.org/badges/swift.svg
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:target: https://governance.openstack.org/reference/tags/index.html
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.. Change things from this point on
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Swift
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=====
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A distributed object storage system designed to scale from a single
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machine to thousands of servers. Swift is optimized for multi-tenancy
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and high concurrency. Swift is ideal for backups, web and mobile
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content, and any other unstructured data that can grow without bound.
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Swift provides a simple, REST-based API fully documented at
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http://docs.openstack.org/.
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Swift was originally developed as the basis for Rackspace's Cloud Files
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and was open-sourced in 2010 as part of the OpenStack project. It has
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since grown to include contributions from many companies and has spawned
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a thriving ecosystem of 3rd party tools. Swift's contributors are listed
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in the AUTHORS file.
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Docs
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----
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To build documentation install sphinx (``pip install sphinx``), run
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``python setup.py build_sphinx``, and then browse to
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/doc/build/html/index.html. These docs are auto-generated after every
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commit and available online at
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http://docs.openstack.org/developer/swift/.
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For Developers
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--------------
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Getting Started
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~~~~~~~~~~~~~~~
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Swift is part of OpenStack and follows the code contribution, review, and testing processes common to all OpenStack projects.
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If you would like to start contributing, check out these
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`notes <CONTRIBUTING.rst>`__ to help you get started.
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The best place to get started is the
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`"SAIO - Swift All In One" <http://docs.openstack.org/developer/swift/development_saio.html>`__.
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This document will walk you through setting up a development cluster of
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Swift in a VM. The SAIO environment is ideal for running small-scale
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tests against swift and trying out new features and bug fixes.
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Tests
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~~~~~
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There are three types of tests included in Swift's source tree.
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#. Unit tests
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#. Functional tests
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#. Probe tests
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Unit tests check that small sections of the code behave properly. For example,
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a unit test may test a single function to ensure that various input gives the
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expected output. This validates that the code is correct and regressions are
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not introduced.
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Functional tests check that the client API is working as expected. These can
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be run against any endpoint claiming to support the Swift API (although some
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tests require multiple accounts with different privilege levels). These are
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"black box" tests that ensure that client apps written against Swift will
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continue to work.
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Probe tests are "white box" tests that validate the internal workings of a
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Swift cluster. They are written to work against the
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`"SAIO - Swift All In One" <http://docs.openstack.org/developer/swift/development_saio.html>`__
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dev environment. For example, a probe test may create an object, delete one
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replica, and ensure that the background consistency processes find and correct
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the error.
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You can run unit tests with ``.unittests``, functional tests with
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``.functests``, and probe tests with ``.probetests``. There is an
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additional ``.alltests`` script that wraps the other three.
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Code Organization
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~~~~~~~~~~~~~~~~~
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- bin/: Executable scripts that are the processes run by the deployer
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- doc/: Documentation
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- etc/: Sample config files
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- examples/: Config snippets used in the docs
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- swift/: Core code
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- account/: account server
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- cli/: code that backs some of the CLI tools in bin/
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- common/: code shared by different modules
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- middleware/: "standard", officially-supported middleware
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- ring/: code implementing Swift's ring
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- container/: container server
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- locale/: internationalization (translation) data
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- obj/: object server
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- proxy/: proxy server
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- test/: Unit, functional, and probe tests
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Data Flow
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~~~~~~~~~
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Swift is a WSGI application and uses eventlet's WSGI server. After the
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processes are running, the entry point for new requests is the
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``Application`` class in ``swift/proxy/server.py``. From there, a
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controller is chosen, and the request is processed. The proxy may choose
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to forward the request to a back- end server. For example, the entry
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point for requests to the object server is the ``ObjectController``
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class in ``swift/obj/server.py``.
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For Deployers
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-------------
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Deployer docs are also available at
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http://docs.openstack.org/developer/swift/. A good starting point is at
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http://docs.openstack.org/developer/swift/deployment_guide.html
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There is an `ops runbook <http://docs.openstack.org/developer/swift/ops_runbook/>`__
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that gives information about how to diagnose and troubleshoot common issues
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when running a Swift cluster.
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You can run functional tests against a swift cluster with
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``.functests``. These functional tests require ``/etc/swift/test.conf``
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to run. A sample config file can be found in this source tree in
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``test/sample.conf``.
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For Client Apps
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---------------
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For client applications, official Python language bindings are provided
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at http://github.com/openstack/python-swiftclient.
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Complete API documentation at
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http://developer.openstack.org/api-ref/object-store/
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There is a large ecosystem of applications and libraries that support and
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work with OpenStack Swift. Several are listed on the
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`associated projects <http://docs.openstack.org/developer/swift/associated_projects.html>`__
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page.
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--------------
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For more information come hang out in #openstack-swift on freenode.
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Thanks,
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The Swift Development Team
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