scoreboard

scoreboard is a light weight leaderboard for node.js. It can be used keep score and ranks between multiple objects and scoring types. It is backed by Redis and sorted sets.

Where to use

• Trending Charts
• Realtime Charts
• Historical Charts
• Game mechanics

Installation

  $ npm install scoreboard

Example

Setup

var scoreboard = require('scoreboard')
var Score = scoreboard.Score;
var scores = new Score();

Redis Connection Settings

scoreboard.redis.createClient = function() {
  var client = redis.createClient(1234, '192.168.100.1');
  client.auth('somethingsecret');
  return client;
};

Indexing

Awarding point to an object is simple. Scoreboard supports multiple leaderboards, and is are partitioned by different a key

scores.index('monsters', 100, 'edward');
scores.index('aliens', 100, 'edward');
scores.index('monsters', 50, 'nancy');
scores.index('aliens', 200, 'nancy');

Leaderboard

To perform a query against the scoreboard to find the leaders, you simple use Score#leader with a list of keys, and invoke run with a callback to fetch the results

Single scoreboard

Find leader in just monsters

scores.leaders({keys:['monsters']}).run(function(err, leaderboard)) {
  console.log(leaderboard);
});

Results

['edward', 'nancy']

Multiple scoreboards

Find leader in both monsters and aliens. The scores across the two sets are totalled together

scores.leaders({keys:['monsters','aliens']}).run(function(err, leaderboard)) {
  console.log(leaderboard);
});

Results:

['nancy', 'edward']

Time series plus multiple scoreboards

Score are stored in Redis on two types of buckets, overall and days. Obviously the overall buckets are used to track scores thoughout the entire life of the scoreboard. But day buckets allow for more percise queries.

This will return the leaderboard for monsters and aliens between 1/1/2012 and 1/31/2012:

scores.leaders({ keys:['monsters','aliens'], date: {$start: new Date('1/1/2012'), $end: new Date('1/31/2012') } })
  .run(function(err, leaderboard)) {
    console.log(leaderboard);
  });

Results:

['nancy', 'edward']

Pagination

Paginations is super easy with scoreboard. All you need is skip and limit

This will return the top 0 - 100 of the time series leaderboard

scores.leaders({ keys:['monsters','aliens'], date: {$start: new Date('1/1/2012'), $end: new Date('1/31/2012') } })
  .skip(0)
  .limit(100)
  .run(function(err, leaderboard)) {
    console.log(leaderboard);
  });

License

(The MIT License)

Copyright (c) 2012 Edward Chan <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.