fix(network): fix stun error on startup if no network available

Fixed #7

src/background/checkInternet.js

@@ -0,0 +1,10 @@
+// https://stackoverflow.com/questions/15270902/check-for-internet-connectivity-in-nodejs
+module.exports = function checkInternet(cb) {
+    require('dns').lookup('google.com',function(err) {
+        if (err && err.code == "ENOTFOUND") {
+            cb(false);
+        } else {
+            cb(true);
+        }
+    })
+}

src/background/config.js

@@ -15,7 +15,7 @@ let config = {
 	sitemapMaxSize: 25000,
 
 	sphinx: {
-	  host     : 'localhost',
+	  host     : '127.0.0.1',
 	  port     : 9306,
 	  connectionLimit: 30
 	},

src/background/spider.js

@@ -26,6 +26,8 @@ const balanceDebug = _debug('main:balance');
 const fakeTorrentsDebug = _debug('main:fakeTorrents');
 const quotaDebug = _debug('main:quota');
 
+const checkInternet = require('./checkInternet')
+
 const {torrentTypeDetect} = require('../app/content');
 
 const torrentClient = require('./torrentClient')
@@ -1062,6 +1064,9 @@ client.on('complete', function (metadata, infohash, rinfo) {
 	}
 });
 
+checkInternet((connected) => {
+	if(!connected)
+		return
 
 	const { STUN_BINDING_REQUEST, STUN_ATTR_XOR_MAPPED_ADDRESS } = stun.constants
 	const stunServer = stun.createServer()
@@ -1074,6 +1079,7 @@ stunServer.once('bindingResponse', stunMsg => {
 		p2p.ignoreAddresses.push(address)
 	})
 	stunServer.send(stunRequest, 19302, 'stun.l.google.com')	
+})
 
 let upnp
 if(config.upnp)