Storage backend (v2)

Warning

This backend is considered unstable and should be used for upstream development only.

In order to implement a storage backend for cloudkitty, you’ll have to implement the following abstract class:

class cloudkitty.storage.v2.BaseStorage(*args, **kwargs)

Abstract class for v2 storage objects.

abstract delete(begin=None, end=None, filters=None)

Deletes all data from for the given period and filters.

Parameters

• begin (datetime) – Start date

• end (datetime) – End date

• filters (dict) – Attributes to filter on. ex: {‘flavor_id’: ‘42’}

static get_retention()

Returns the retention period defined in the configuration.

Return type

datetime.timedelta

abstract init()

Called for storage backend initialization

abstract push(dataframes, scope_id=None)

Pushes dataframes to the storage backend

Parameters

dataframes ([cloudkitty.dataframe.DataFrame]) – List of dataframes

abstract retrieve(begin=None, end=None, filters=None, metric_types=None, offset=0, limit=1000, paginate=True)

Returns the following dict:

{
   'total': int, # total amount of measures found
   'dataframes': list of dataframes,
}

Parameters

• begin (datetime) – Start date

• end (datetime) – End date

• filters (dict) – Attributes to filter on. ex: {‘flavor_id’: ‘42’}

• metric_types (str or list) – Metric type to filter on.

• offset (int) – Offset for pagination

• limit (int) – Maximum amount of elements to return

• paginate (bool) – Defaults to True. If False, all found results will be returned.

Return type

dict

abstract total(groupby=None, begin=None, end=None, metric_types=None, filters=None, offset=0, limit=1000, paginate=True)

Returns a grouped total for given groupby.

Parameters

• groupby (list of strings) – Attributes on which to group by. These attributes must be part of the ‘groupby’ section for the given metric type in metrics.yml. In order to group by metric type, add ‘type’ to the groupby list.

• begin (datetime) – Start date

• end (datetime) – End date

• filters (dict) – Attributes to filter on. ex: {‘flavor_id’: ‘42’}

• metric_types (str or list) – Metric type to filter on.

• offset (int) – Offset for pagination

• limit (int) – Maximum amount of elements to return

• paginate (bool) – Defaults to True. If False, all found results will be returned.

Return type

dict

Returns a dict with the following format:

{
   'total': int, # total amount of results found
   'results': list of results,
}

Each result has the following format:

{
    'begin': XXX,
    'end': XXX,
    'rate': XXX,
    'groupby1': XXX,
    'groupby2': XXX
}

You’ll then need to register an entrypoint corresponding to your storage backend in the cloudkitty.storage.v2.backends section of the setup.cfg file.