Button dashboard code

dashboard.js

module['exports'] = function dashboard (hook) {
  
  function get(key, callback) {
    var datastore = hook.datastore;
    datastore.get(key, function (err, counter) {
      callback(counter || 0);
    });
  }
  
  get('counter', function (counter) {
    hook.res.end(counter);
  });
};