c0866ceaac
This commit tries to give the user a reason that their SLO manifest
was invalid instead of just saying "Invalid SLO Manifest File". It
doesn't get every error condition, but it's better than before.
Examples of things that now have real error messages include:
* bad keys in manifest (e.g. using "name" instead of "path")
* bogus range (e.g. "bytes=123-taco")
* multiple ranges (e.g. "bytes=10-20,30-40")
* bad JSON structure (i.e. not a list of objects)
* non-integer size_bytes
Also fixed an annoyance with unspecified-size segments that are too
small. Previously, if you uploaded a segment reference with
'{"size_bytes": null, ...}' in it and the referenced segment was less
than 1 MiB, you'd get a response that looked like this:
HTTP/1.1 400 Bad Request
Content-Length: 62
Content-Type: text/html; charset=UTF-8
X-Trans-Id: txd9ee3b25896642098e4d9-0055dd095a
Date: Wed, 26 Aug 2015 00:33:30 GMT
Each segment, except the last, must be at least 1048576 bytes.
This is true, but not particularly helpful, since it doesn't tell you
which of your segments violated the rule.
Now you get something more like this:
HTTP/1.1 400 Bad Request
Content-Length: 49
Content-Type: text/plain
X-Trans-Id: tx586e52580bac4956ad8e2-0055dd09c2
Date: Wed, 26 Aug 2015 00:35:14 GMT
Errors:
/segs/small, Too Small; each segment, except the last...
It's not exactly a tutorial on SLO manifests, but at least it names
the problematic segment.
This also changes the status code for a self-referential manifest from
409 to 400. The rest of the error machinery was using 400, and
special-casing self-reference would be really annoying. Besides, now
that we're showing more than one error message at a time, what would
the right status code be for a manifest with a self-referential
segment *and* a segment with a bad range? 400? 409? 404.5? It's much
more consistent to just say invalid manifest --> 400.
Change-Id: I2275683230b36bc273319254e37c16b9e9b9d69c
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