wificonfig.js

"use strict";
var child_process = require('child_process');
var fs = require('fs');
var path = require('path');
var ejs = require ('ejs');
var log = require ('./log');

var settings;

var RASPBERRY = 'raspberry';
var ARDUINO_GALILEO = 'arduinogalileo';

var GALILEO = 'galileo';
// var RASPBERRY_PATH = '/boot/wyliodrin.json';
// var ARDUINO_GALILEO_PATH = '/media/card/wyliodrin.json';
// var CONFIG_FILE = path.join(__dirname,'conf/wyliodrin.json');

var RETRY_TIME = 2000;

var WIFICONF = path.join(__dirname, 'conf/wireless/wireless.conf');

function init(s, functie)
{
	settings = s;
	console.log('Starting Wyliodrin');
	isRaspberry(functie);
	isGalileo(functie);
}

/* Function checks if the board is a raspberry pi. 
		Step one. */
function isRaspberry(functie)
{
	console.log('Is it a Raspberry Pi?');
	var child  = child_process.exec('cat /proc/cpuinfo | grep BCM',
		function(error, stdout, stderr)
		{
			if(error != null)
				log.putError('\t not Raspberry Pi');
			if(stdout != '')
			{
				findConfigFile(RASPBERRY,functie);
			}
		});
}

/* Function checks if the board is a galileo. 
		Step one. */
function isGalileo(functie)
{
	console.log('Is it an Arduino Galileo?');
	var child  = child_process.exec('cat /proc/cpuinfo | grep GenuineIntel',
		function(error, stdout, stderr)
		{
			if(error != null)
				log.putError('\t not Arduino Galileo');
			if(stdout != '')
			{
				findConfigFile(ARDUINO_GALILEO,functie);
			}
		});
}

function findSSID (done)
{
	child_process.exec ('iwgetid -r', function (error, stdout, stderr)
	{
		if (!error)
		{
			done (stdout);
		}
		else
		{
			done (null);
		}
	});
}

/* Function searches for config file depending on the platform.  
	Step two. */
function findConfigFile(platform, functie)
{
	log.putLog ('Board is '+platform);
	log.putLog('Reading config file');
	settings = settings[platform];
	var JSON_PATH = settings.config_file;
	var d = null;
	var resetWIFI = false;
	var start = true;
	if(fs.existsSync(JSON_PATH))
	{
		var data = fs.readFileSync(JSON_PATH);
		try
		{
			var newJsonData = JSON.parse(data);
			findSSID (function (ssid)
			{
				if(newJsonData.ssid != '' && ssid!=newJsonData)
				{
					resetWIFI = true;
				}

				log.putLog ('Starting');
				/* resets wifi if data has changed */
				if(!resetWIFI)
				{
					// if(!fs.existsSync(WIFICONF))
					// 	wifi(newJsonData, functie);
					// else 
					functie(settings);
				}
				else
				{
					wifi(newJsonData, functie);
				}
			});
		}
		catch(e)
		{
			log.putError('Cannot load config file');
			start = false;
		}
	}
	else
	{
		start = false;
	}
	if (!start)
	{
		log.putLog ('Not starting, waiting to exit');
		setTimeout (function ()
		{
			process.exit (0);
		}, 600000);
	}
}

function wifi(d, functie)
{
	console.log('wifi');
	if(d != null)
	{
		var WIFIFORM = path.join(__dirname,'conf',d.gadget,'/wireless/wireless_form.conf');
		if (!fs.existsSync(WIFIFORM)) 
		{
			log.putLog ('Board specific WiFi Form not found, using default');
			WIFIFORM = path.join(__dirname,'conf/wireless/wireless_form.conf');
		}
		try
		{
			var wifiData = fs.readFileSync(WIFIFORM);
			var fileWifi = ejs.render (wifiData.toString(), {ssid:d.ssid, scan_ssid:d.scan_ssid, psk:d.psk});
			try
			{
				fs.writeFileSync(WIFICONF, fileWifi);
				child_process.exec ('sudo ifdown wlan0; sudo ifup wlan0', function (error, stdout, stderr)
				{
					if (error!=null) 
					{
						console.log("Error resetting Wifi, retrying "+stderr);
						/* retry after RETY_TIME miliseconds */
						setTimeout(function(){child_process.exec ('sudo ifdown wlan0; sudo ifup wlan0', function (error, stdout, stderr)
									{
										if (error!=null) 
										{
											/* retry after 2*RETRY_TIME miliseconds */
							
											setTimeout(function(){child_process.exec ('sudo ifdown wlan0; sudo ifup wlan0', function (error, stdout, stderr)
												{
													if (error!=null) 
													{
														log.putError('Wifi error' +stderr);	
													}
													else
													{
														functie(settings);
													}
												})}, 2*RETRY_TIME);
										}
										else
										{
											functie(settings);
										}
									})}, RETRY_TIME);							
					}
					else
					{
						functie(settings);
					}
				});
			}
			catch(e)
			{
				log.putError('Cannot write wifi file '+e);
				functie (settings);
			}
		}
		catch(e)
		{
			log.putError('Cannot read wifi file '+e);
			functie (settings);
		}
	}
	else
	{
		log.putError ('No cofiguration file');
	}		
}
exports.init = init;