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core/budfox/budfox.js

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+// Budfox is the realtime market for Gekko!
+//
+// Read more here:
+// @link https://github.com/askmike/gekko/blob/stable/docs/internals/budfox.md
+//
+// > [getting up] I don't know. I guess I realized that I'm just Bud Fox.
+// > As much as I wanted to be Gordon Gekko, I'll *always* be Bud Fox.
+// > [tosses back the handkerchief and walks away]
+
+var _ = require('lodash');
+var async = require('async');
+
+var util = require(__dirname + '/../util');
+var dirs = util.dirs();
+
+var Heart = require(dirs.budfox + 'heart');
+var MarketDataProvider =  require(dirs.budfox + 'marketDataProvider');
+var CandleManager = require(dirs.budfox + 'candleManager');
+
+var BudFox = function(config) {
+  _.bindAll(this);
+
+  Readable.call(this, {objectMode: true});
+
+  // BudFox internal modules:
+  
+  this.heart = new Heart;
+  this.marketDataProvider = new MarketDataProvider(config);
+  this.candleManager = new CandleManager;
+
+  //    BudFox data flow:
+
+  // relay a marketUpdate event
+  this.marketDataProvider.on(
+    'marketUpdate',
+    e => this.emit('marketUpdate', e)
+  );
+
+  // relay a marketStart event
+  this.marketDataProvider.on(
+    'marketStart',
+    e => this.emit('marketStart', e)
+  );
+
+  // Output the candles
+  this.candleManager.on(
+    'candles',
+    this.pushCandles
+  );
+
+  // on every `tick` retrieve trade data
+  this.heart.on(
+    'tick',
+    this.marketDataProvider.retrieve
+  );
+
+  // on new trade data create candles
+  this.marketDataProvider.on(
+    'trades',
+    this.candleManager.processTrades
+  );
+
+  this.heart.pump();
+}
+
+var Readable = require('stream').Readable;
+
+BudFox.prototype = Object.create(Readable.prototype, {
+  constructor: { value: BudFox }
+});
+
+BudFox.prototype._read = function noop() {}
+
+BudFox.prototype.pushCandles = function(candles) {
+  _.each(candles, this.push);
+}
+
+module.exports = BudFox;