Leaderboards #

Leaderboards are a common feature in games to provide engagement and competitiveness among your player base, and Nakama provides a feature-rich implementation of leaderboards. The Hiro GDK wraps the features and functionality of the Nakama leaderboards system, and adds: built-in support for regional leaderboards, identified by their ISO Code, convenient display for friends leaderboards (using Nakama’s Friends feature), and a convenient way to fan-out score updates to multiple leaderboards.

Customization parameters #

The following JSON represents the customization parameters you can use to configure the default user experience for the leaderboard system.

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{
  "events": {
    "leaderboard_id1": {
      "name": "Chef Tournament",
      "description": "Play a tournament against other chefs for great rewards!",
      "operator": "set",
      "sort": "desc",
      "start_time": 0,
      "end_time": 0,
      "reset": "0 0 */3 * *", // At 12:00 AM, every 3 days.
      "score_target": 0,
      "max_reroll_count": 0,
      "bucket_size": 50,
      "resource_id": "",
      "cost": {
        "currencies": {
          "coins": 0
        }
      },
      "reward_ranges": [
        {
          "rank_start": 1,
          "rank_end": 1,
          "reward": {
            "currencies": {
              "gems": 100
            }
          }
        }
      ],
      "reward_ranges_team": [
        {
          "rank_start": 1,
          "rank_end": 1,
          "reward": {
            "currencies": {
              "gems": 100
            }
          }
        }
      ]
    }
  }
}

The JSON schema defines an events object which must contain an individual object for each leaderboard you wish to define in the system. You can configure as few or as many energy types as needed for your desired gameplay.

Each leaderboard is keyed by id and may define the following:

The rewards properties above (reward_ranges, reward_ranges_team) have the additional sub-properties:

Initializing the leaderboards system #

The leaderboards system relies on the Nakama System which must be passed in as dependency via the constructor. You can also pass an array of leaderboard Ids for which you would like to retrieve the initial leaderboard records for.

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var leaderboardsSystem = new LeaderboardsSystem(nakamaSystem, new [] { "<leaderboardId>" });
systems.Add(leaderboardsSystem);

Subscribing to changes in the leaderboards system #

You can listen for changes in the leaderboards system so that you can respond appropriately, such as updating the UI, by implementing the appropriate interface.

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var disposer = SystemObserver<LeaderboardsSystem>.Create(leaderboardsSystem, system => {
  Instance.Logger.Info($"System updated.");

  // Update UI elements etc as necessary here...
});

Refreshing the leaderboards system #

To ensure the leaderboards system has the latest information from Nakama you can refresh it.

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await leaderboardsSystem.RefreshAsync();

You can also refresh an individual leaderboard by passing it’s ID and optionally a cursor.

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await leaderboardsSystem.RefreshAsync("<leaderboardId>", "<optionalCursor>");

Getting leaderboard records #

You can get cached leaderboard records for a specific leaderboard.

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var records = leaderboardsSystem.GetRecords("<leaderboardId>");

Getting leaderboard records for specific users #

You can get leaderboard records for a specific set of users, by providing either an array of user Ids, a list of friends or a Team (as defined in the TeamNakamaSystem).

For specific users:

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var records = await leaderboardsSystem.GetRecordsAsync("<leaderboardId>", new[] { "<userId1>", "<userId2>" });

For friends:

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var friendsList = await _nakamaSystem.Client.ListFriendsAsync(_nakamaSystem.Session);
var records = await leaderboardsSystem.GetRecordsAsync("<leaderboardId>", friendsList);

For the user’s team:

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var records = await leaderboardsSystem.GetRecordsAsync("<leaderboardId", teamSystem);

Getting the user’s own leaderboard record #

You can get the user’s own leaderboard record.

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var record = leaderboardsSystem.GetRecord("<leaderboardId>");

Submitting a leaderboard score #

You can submit a leaderboard score for the user.

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var score = 100;
var subscore = 10;
var metadata = "<metadataJson>";

var record = await leaderboardsSystem.WriteScore("<leaderboardId>", score, subscore, metadata);