meta-data endpoints

[bradrydzewski]

we should provide a set of endpoint for administrators to get meta-data, such as:

1. list of all active sessions
2. list of all subscriptions for a single session
3. list of all active handlers (topics, queues, etc)
4. list of all enqueues messages in a single queue
5. list of all subscribers to a single queue

[bradrydzewski]

some recent progress on this ...

list of active sessions:

GET /meta/sessions

[
  {
    "address": "127.0.0.1:60168",
    "username": "johnsmith",
    "headers": {
      "x-real-ip": "127.0.0.1"
    }
  },
  {
    "address": "127.0.0.1:60169",
    "username": "janedoe",
    "headers": {
      "x-real-ip": "127.0.0.1"
    }
  }
]

list of active handlers / destinations:

GET /meta/destinations

[
  {
    "destination": "\/topic\/events"
  },
  {
    "destination": "\/topic\/logs.28"
  },
  {
    "destination": "\/queue\/pending"
  }
  {
    "destination": "\/queue\/updates"
  }
]