[Core Metadata] Add "parent" field to Device objects

[eaton-coreymutter]

🚀 Feature Request

Relevant Package [REQUIRED]

core-metadata, the Go and C SDKs

Description [REQUIRED]

Implementing the use case in the Device-Parent-Child-Relationships UCR.

Allow Device objects to have an optional "parent": "parent_device_name" property. Allow querying core-metadata for all descendants of a device.

Describe the solution you'd like

• Add the field, optional "parent":"(device name string)", to the Device objects
• Update the structures in the Go (go-mod-core-contracts?) and C SDKs.
• Update core-metadata to disallow deleting a device who is listed as parent of another.
• Update core-metadata API GET /device/all to add an optional parameter "descendants" with a device-name-string value. If provided, limit results to devices with that device as parent, grandparent, etc.
• Update Swagger and HTML docs appropriately.

Describe alternatives you've considered

Considered using labels instead in the UCR, decided it was better to have integrity enforcement and query-ability.

[cloudxxx8]

let's discuss in the Core/Device WG meeting

[cloudxxx8]

In the Core WG meeting today, our conclusion is prefer to just use top-level "parent":"(device name)" for reducing the complexity

[cloudxxx8]

@eaton-coreymutter the major work of this issue is the API implementation and C SDK work. Do you have any resource to work on this in this release version?

[eaton-coreymutter]

Just me, I've gotten started