4f2ed8bcd0
This commit lets clients receive multipart/byteranges responses (see RFC 7233, Appendix A) for erasure-coded objects. Clients can already do this for replicated objects, so this brings EC closer to feature parity (ha!). GetOrHeadHandler got a base class extracted from it that treats an HTTP response as a sequence of byte-range responses. This way, it can continue to yield whole fragments, not just N-byte pieces of the raw HTTP response, since an N-byte piece of a multipart/byteranges response is pretty much useless. There are a couple of bonus fixes in here, too. For starters, download resuming now works on multipart/byteranges responses. Before, it only worked on 200 responses or 206 responses for a single byte range. Also, BufferedHTTPResponse grew a readline() method. Also, the MIME response for replicated objects got tightened up a little. Before, it had some leading and trailing CRLFs which, while allowed by RFC 7233, provide no benefit. Now, both replicated and EC multipart/byteranges avoid extraneous bytes. This let me re-use the Content-Length calculation in swob instead of having to either hack around it or add extraneous whitespace to match. Change-Id: I16fc65e0ec4e356706d327bdb02a3741e36330a0
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". 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 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