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On 19/05/15 17:19 +0100, Daniel P. Berrange wrote:
>In Nova we are attempting to model[1] the glance image metadata and
>properties using the Nova object model (now oslo.versionedobjects).
>
>The one item I'm stuck on understanding is the 'locations' field
>and more specifically the 'metadata' element in each location
>entry
>
>
>In the file glance/api/v2/images.py I can see this description
>of the data format:
>
>        'locations': {
>            'type': 'array',
>            'items': {
>                'type': 'object',
>                'properties': {
>                    'url': {
>                        'type': 'string',
>                        'maxLength': 255,
>                    },
>                    'metadata': {
>                        'type': 'object',
>                    },
>                },
>                'required': ['url', 'metadata'],
>            },
>            'description': _('A set of URLs to access the image file kept in '
>                             'external store'),
>
>
>As you can see here, 'metadata' is just said to be of type 'object'.
>
>Is there somewhere that actually describes what is valid contents
>for this field ? Is it sufficient to assume the metadata will only
>ever be a dict of strings, or can the metadata be a complex type
>with arbitrarily nested data structures ?

It's just arbitrary metadata for now, we don't have a specific format.
I'm curious to know if there are folks using this field. We do (did)
have a use case for it.

Flavio
>
>Regards,
>Daniel
>
>[1] https://review.openstack.org/#/c/76234/
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Flavio Percoco
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