hubs_getBestRoom.js

// Get the URL of a Hubs room that is not empty nor at room capacity
// Warning: the proper API is being defined at https://github.com/mozilla/reticulum/pull/382
let getBestRoom = async () => {
  // by https://twitter.com/jamesckane for @paracreative worked on the #ApartPosters show.
  // let endpoint = "https://show.apartposters.com/api/v1/media/search?source=rooms&filter=public";
  let endpoint = "/api/v1/media/search?source=rooms&filter=public";
  let response = await fetch(endpoint);
  let json = await response.json();
  let rooms = json.entries;
  let bestRoom = {};
  rooms.forEach(room => {
    if (Object.keys(bestRoom).length === 0) bestRoom = room;
    let memberCount = room.member_count;
    let lobbyCount = room.lobby_count;
    let totalCount = memberCount + lobbyCount;
    let buffer = 5;
    let roomCapacity = room.room_size - buffer;
    if ((totalCount >= 0 && totalCount < roomCapacity)) {
      bestRoom = room;
    }
  });
  return bestRoom.url;
  // window.location.href = bestRoom.url; // to directly redirect and balance your server load
};

// PS: See also https://gist.github.com/camelgod/a712ce7d43f21260ae5b4971b9a58dfb
// to limit to a set of rooms via ID