refactor code

The communication with the arduino is now handled by a designated module (called ar-com).

nodejs/ar-com/arduino.js

@@ -0,0 +1,55 @@
+var events = require('events'),
+    child  = require('child_process'),
+    util   = require('util'),
+    serial = require("serialport").SerialPort;
+
+var Arduino = function (baudrate) {
+  this.baudrate = baudrate && baudrate || 9600;
+  this.writeBuffer = [];
+  this.success;
+}
+
+Arduino.prototype.setup = function () {
+  child.exec('cd ../arduino && ino build && ino upload', function(err, stdout, stderr){
+    
+    if(err){console.log('Please install the ino utility and connect arduino!\nIf there are other open programs that communicate with the arduino, close them!'); return this.success = false;}
+
+    var buff = stdout.slice(stdout.indexOf('Guessing serial port ... ')+25);
+    buff = buff.slice(0, buff.indexOf('\n'));
+    console.log('Guessing serial port ... ' + buff);
+
+    this.serial = new serial(buff, {
+      baudrate: this.baudrate,
+      parser: serial.parsers.readline('\n')
+    }, false);
+    
+    this.serial.open(function (error) {
+      if ( error ) {
+        console.log('Please check arduino!')
+        return this.success = false;
+      }
+
+      serialPort.write(new Buffer('00000000'));
+    });
+    
+    this.success = true;
+    this.processWriteBuffer();    
+  });
+}
+
+Arduino.prototype.write = function (m) {
+  if (this.success) {
+    this.serial.write(m);
+  } else {
+    this.writeBuffer.push(m);
+    console.log('Board isn\'t available (yet?).')
+  }
+}
+
+Arduino.prototype.processWriteBuffer = function () {
+  while (this.writeBuffer.length > 0) {
+    this.write(this.writeBuffer.shift());
+  }
+}
+
+module.exports = Arduino;

nodejs/routes/index.js

@@ -1,32 +1,9 @@
 var express = require('express');
 var router = express.Router();
-var child = require("child_process");
+var Arduino = new require('../ar-com/arduino');
+var arduino = new Arduino();
 
-var SerialPort = require("serialport").SerialPort
+arduino.setup()
-var success;
-child.exec('cd ../arduino && ino build && ino upload', function(err, stdout, stderr){
-    
-  if(err){console.log('Please install the ino utility and connect arduino!\nIf there are other open programs that communicate with the arduino, close them!'); return success = false;}
-
-  var buff = stdout.slice(stdout.indexOf('Guessing serial port ... ')+25);
-  buff = buff.slice(0, buff.indexOf('\n'));
-  console.log('Guessing serial port ... ' + buff);
-
-  serialPort = new SerialPort(buff, {
-    baudrate: 9600
-  }, false);
-    
-  serialPort.open(function (error) {
-    if ( error ) {
-      console.log('Please check arduino!')
-      return successfalse;
-    } 
-  });
-
-  return success = true;    
-});
-
-//console.log(success);
 
 /* GET home page. */ 
 router.get('/', function(req, res, next) {
@@ -34,7 +11,7 @@ router.get('/', function(req, res, next) {
 });
 
 router.get('/toggleLight', function (req, res) {
-  if(success) { serialPort.write(new Buffer('~','ascii')); } else {console.log("arduino not connected")}
+  arduino.write(new Buffer('~','ascii'));
   res.send('switch light');
 });