kibana-123/src/core_plugins/timelion/server/lib/classes/timelion_function.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

var _ = require('lodash');
var loadFunctions = require('../load_functions.js');
var fitFunctions  = loadFunctions('fit_functions');

module.exports = class TimelionFunction {
  constructor(name, config) {
    this.name = name;
    this.args = config.args || [];
    this.argsByName = _.indexBy(this.args, 'name');
    this.help = config.help || '';
    this.aliases = config.aliases || [];
    this.extended = config.extended || false;

    // WTF is this? How could you not have a fn? Wtf would the thing be used for?
    var originalFunction = config.fn || function (input) { return input; };

    // Currently only re-fits the series.
    this.originalFn = originalFunction;

    this.fn = function (args, tlConfig) {
      var config = _.clone(tlConfig);
      return Promise.resolve(originalFunction(args, config)).then(function (seriesList) {
        seriesList.list = _.map(seriesList.list, function (series) {
          var target = tlConfig.getTargetSeries();

          // Don't fit if the series are already the same
          if (_.isEqual(_.map(series.data, 0), _.map(target, 0))) return series;

          var fit;
          if (args.byName.fit) {
            fit = args.byName.fit;
          } else if (series.fit) {
            fit = series.fit;
          } else {
            fit = 'nearest';
          }

          series.data = fitFunctions[fit](series.data, tlConfig.getTargetSeries());
          return series;
        });
        return seriesList;
      });
    };
  }
};