From e5684a1c3ac8635f658fbe4b5ae8f0bb071216c2 Mon Sep 17 00:00:00 2001
From: Petros Aggelatos <petrosagg@gmail.com>
Date: Mon, 23 Dec 2013 04:22:54 +0000
Subject: [PATCH] Promisify blink

---
 src/api.coffee   | 14 ++++++++------
 src/utils.coffee | 10 ++++++----
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/api.coffee b/src/api.coffee
index 2177ada8..50d813fd 100644
--- a/src/api.coffee
+++ b/src/api.coffee
@@ -1,15 +1,17 @@
-fs = require 'fs'
+Promise = require 'bluebird'
+fs = Promise.promisifyAll require 'fs'
+utils = require './utils'
 express = require 'express'
 dockerode = require 'dockerode'
 
 api = express()
 
 LED_FILE = '/sys/class/leds/led0/brightness'
-blink = (ms = 200, callback) ->
-	fs.writeFileSync(LED_FILE, 1)
-	setTimeout(->
-		fs.writeFile(LED_FILE, 0, callback)
-	, ms)
+
+blink = (ms = 200) ->
+	fs.writeFileAsync(LED_FILE, 1)
+		.then(-> utils.delay(ms))
+		.then(-> fs.writeFileAsync(LED_FILE, 0))
 
 api.post('/blink', (req, res) ->
 	interval = setInterval(blink, 400)
diff --git a/src/utils.coffee b/src/utils.coffee
index aa389d51..98704f14 100644
--- a/src/utils.coffee
+++ b/src/utils.coffee
@@ -1,7 +1,7 @@
-Promise = require('bluebird')
-fs = Promise.promisifyAll(require('fs'))
-os = require('os')
-crypto = require('crypto')
+Promise = require 'bluebird'
+fs = Promise.promisifyAll require 'fs'
+os = require 'os'
+crypto = require 'crypto'
 
 # Parses the output of /proc/cpuinfo to find the "Serial : 710abf21" line
 # or the hostname if there isn't a serial number (when run in dev mode)
@@ -16,3 +16,5 @@ exports.getDeviceUuid = ->
 		
 		return crypto.createHash('sha1').update(serial, 'utf8').digest('hex')
 	)
+
+exports.delay = (ms) -> new Promise (v) -> setTimeout(v, ms)