first commit

core/budfox/heart.js

@@ -0,0 +1,51 @@
+// The heart schedules and emit ticks every 20 seconds.
+
+var util = require(__dirname + '/../util');
+var log = require(util.dirs().core + 'log');
+
+var _ = require('lodash');
+var moment = require('moment');
+
+if (util.getConfig().watch.tickrate)
+  var TICKRATE = util.getConfig().watch.tickrate;
+else if(util.getConfig().watch.exchange === 'okcoin')
+  var TICKRATE = 2;
+else
+  var TICKRATE = 20;
+
+var Heart = function() {
+  this.lastTick = false;
+
+  _.bindAll(this);
+}
+
+util.makeEventEmitter(Heart);
+
+Heart.prototype.pump = function() {
+  log.debug('scheduling ticks');
+  this.scheduleTicks();
+}
+
+Heart.prototype.tick = function() {
+  if(this.lastTick) {
+    // make sure the last tick happened not to lang ago
+    // @link https://github.com/askmike/gekko/issues/514
+    if(this.lastTick < moment().unix() - TICKRATE * 3)
+      util.die('Failed to tick in time, see https://github.com/askmike/gekko/issues/514 for details', true);
+  }
+
+  this.lastTick = moment().unix();
+  this.emit('tick');
+}
+
+Heart.prototype.scheduleTicks = function() {
+  setInterval(
+    this.tick,
+    +moment.duration(TICKRATE, 's')
+  );
+
+  // start!
+  _.defer(this.tick);
+}
+
+module.exports = Heart;