From 8276d87e2a86769c9f3da4cfc744617cbcb670b7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Ma=C5=82ecki?= <me@mmalecki.com>
Date: Wed, 16 Apr 2014 10:12:38 +0200
Subject: [PATCH] Add optional callback to `pollRate`

---
 lib/trader.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/trader.js b/lib/trader.js
index d7698e93..d7c958c7 100644
--- a/lib/trader.js
+++ b/lib/trader.js
@@ -182,15 +182,19 @@ Trader.prototype.pollBalance = function (callback) {
   });
 };
 
-Trader.prototype.pollRate = function () {
+Trader.prototype.pollRate = function (callback) {
   var self = this;
 
   var currency = self.config.exchanges.settings.currency;
   self.logger.info('polling for rate...');
   self.tickerExchange.ticker(currency, function(err, rate) {
-    if (err) return;
+    if (err) {
+      return callback && callback(err);
+    }
+
     self.logger.info('Rate update:', rate);
     self.rates[currency] = {rate: rate, timestamp: new Date()};
+    callback && callback(null, self.rates[currency]);
   });
 };