Support version list API

https://blueprints.launchpad.net/congress/+spec/api-version

The Congress API should be able to list current supported API versions.

Problem description

Users want to talk with Congress API, but no API support to query the supported versions, so users have no idea about which versions can be supported in the current Congress deployment.

Proposed change

Export the version list API, and show the current API details, include: id, status, update time, links, like other OpenStack project: nova, neutron and etc. Although Congress only support one version API(v1) currently, but the version list API make sense for future API evolution.

Alternatives

None

Policy

None

Policy actions

None

Data sources

None

Data model impact

None

REST API impact

  • Specification for the method

    • List the current supported API versions.

    • Method type: GET

    • Normal http response code(s): 200

    • Expected error http response code(s): None

    • /

    • Parameters which can be passed via the url: None

    • JSON schema definition for the body data if allowed: None

    • JSON schema definition for the response data if any:

    {
  "type": "object",
  "properties": {
      "versions": {
          "type": "array",
          "items": {
              "type": "object",
              "properties": {
                  "status": {
                      "type": "string"
                  },
                  "updated": {
                      "type": "string"
                  },
                  "id": {
                      "type": "string"
                  },
                  "links": {
                      "type": "array",
                      "items": {
                          "type": "object",
                          "properties": {
                              "href": {
                                  "type": "string"
                              },
                              "rel": {
                                  "type": "string"
                              }
                          },
                          "additionalProperties": false,
                          "required": ["href", "rel"]
                      }
                  }
              },
              "additionalProperties": false,
              "required": ["status", "updated", "id", "links"]
          }
      }
  },
  "additionalProperties": false,
  "required": ["versions"]
}

  • Example use case:

    GET /
{
  "versions": [{
      "status": "CURRENT",
      "updated": "2015-07-03T11:33:21Z",
      "id": "v1",
      "links": [{
          "href": "http://10.250.10.29:1789/v1/",
          "rel": "self"
      }]
  }]
}

  • There should not be any impacts to policy.json files for this change.

Security impact

None

Notifications impact

None

Other end user impact

The related works in python-congressclient will also be added.

After this modification, user could get the API version details, like this:

openstack congress version list

Performance impact

None

Other deployer impact

We modify api-paste.ini to add some stuff, so if the operator prepare to upgrade from old release, he need to add the new config items to old api-paste.ini file or override the old using new one.

Developer impact

None

Implementation

Assignee(s)

Primary assignee:

Work items

  • Adds Version class to assemble API versions response.

  • modify api-paste.ini to route the request to the new logic.

  • Make python-congressclient supporting this API.

Dependencies

None

Testing

Some unit tests should been added to cover the new API.

Documentation impact

The related content should be added in Congress API document.

References

None