RFC 2616 Sec 4.4 Message Length describes how the content-length and transfer-encoding headers interact. Basically, if chunked transfer encoding is used, the content-length header value is ignored and if the content-length header is present, and the request is not using chunked transfer-encoding, then the content-length must match the body length. The only Transfer-Coding value we support in the Transfer-Encoding header (to date) is "chunked". RFC 2616 Sec 14.41 specifies that if "multiple encodings have been applied to an entity, the transfer-codings MUST be listed in the order in which they were applied." Since we only supported "chunked". If the Transfer-Encoding header value has multiple transfer-codings, we return a 501 (Not Implemented) (see RFC 2616 Sec 3.6) without checking if chunked is the last one specified. Finally, if transfer-encoding is anything but "chunked", we return a 400 (Bad Request) to the client. This patch adds a new method, message_length, to the swob request object which will apply an algorithm based on RFC 2616 Sec 4.4 leveraging the existing content_length property. In addition to these changes, the proxy server will now notice when the message length specified by the content-length header is greater than the configured object maximum size and fail the request with a 413, "Request Entity Too Large", before reading the entire body. This work flows from https://review.openstack.org/27152. Change-Id: I5d2a30b89092680dee9d946e1aafd017eaaef8c0 Signed-off-by: Peter Portante <peter.portante@redhat.com>
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://doc.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.
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