[Openstack] [Swift] How to get a list of devices from the ring in Java / Bash?

Matthew Oliver matt at oliver.net.au
Mon Jan 30 22:32:01 UTC 2017

Hey Alexandr,

If you wanted to do it using python, and you didn't have swift installed
you can use pickle and unpickle the builder. something like:

  import pickle
  builder = pickle.load(open('<path to builder>')

Then you'd have a python dict structure, where I think you can

or with swift installed you can use the RingBuilder class:

  from swift.common.ring.builder import RingBuilder
  builder = RingBuilder.load('<path to object.builder>')

Where builder.devs will be a list of dictionary objects. You could then
json-ify and output for java to read or put it into an easier to pass list.

There could be a much simpler way, but I'm a Python dev, so this is what
I'd do ;)


On Sat, Jan 28, 2017 at 6:21 AM, Alexandr Porunov <
alexandr.porunov at gmail.com> wrote:

> Hello,
> I need to get a list / array of devices in Java or Bash. Is it possible to
> get? Are there any API or something like that?
> I know we can obtain a list with the next command:
> swift-ring-builder object.builder
> But it return a string with the list of devices which are quite hard to
> parse. In the documentation there is an example how to get a list of
> devices with python:
> devices = list(self._iter_devs())
> But it doesn't show which library to use to get a list of devices and how
> to use that library.
> Sincerely,
> Alexandr
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