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broker_external_storage.md

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Broker External Storage

The mem_broker supports external storage through HTTP API. The external storage may support multiple undermoon clusters at the same time, so there's a <name> argument in the path to differentiate these clusters.

Query data:

GET /api/v1/store/<name>

Response:
  HTTP 200: ExternalStore json
  HTTP 404: <name> not found

Update data:

PUT /api/v1/store/<name>
Basic Auth: <name>:<password>

Request: ExternalStore json
Response:
  HTTP 200 for success
  HTTP 404: <name> not found
  HTTP 409 for version conflict

The structure of ExternalStore is:

{
    "version": <string> or null,
    "store": <data>
}

In the undermoon-operator, this version is ResourceVersion of kubernetes object. The HTTP service should check the version before updating the data.