Fixed hostname resolver and added comments and errors

src/client/tcp_dns.js

@@ -2,30 +2,59 @@ const net = require('net')
 const dns = require('dns')
 
 module.exports = function (client, options) {
+
+  // Default options
   options.port = options.port || 25565
   options.host = options.host || 'localhost'
 
   if (!options.connect) {
+
     options.connect = (client) => {
+
+      // Use stream if provided
       if (options.stream) {
         client.setSocket(options.stream)
         client.emit('connect')
-      } else if (options.port === 25565 && net.isIP(options.host) === 0 && options.host !== 'localhost') {
-        dns.resolveSrv('_minecraft._tcp.' + options.host, function (err, addresses) {
+        return;
+      } 
+      
+      // If port was not defined (defauls to 25565), host is not an ip neither localhost
+      if (options.port === 25565 && net.isIP(options.host) === 0 && options.host !== 'localhost') {
+
+        // Try to resolve SRV records for the comain
+        dns.resolveSrv('_minecraft._tcp.' + options.host, (err, addresses) => {
+
+          // Error resolving domain
           if (err) {
-            client.setSocket(net.connect(options.port, options.host))
-            return;
+
+            // Could not resolve SRV lookup, connect directly
+            if(err.code === 'ENODATA') {
+                client.setSocket(net.connect(options.port, options.host))
+                return;
+            } else {
+                // Something else happened
+                return client.emit('error', err)
+            }
+           
           }
+          
+          // SRV Lookup resolved conrrectly
           if (addresses && addresses.length > 0) {
             client.setSocket(net.connect(addresses[0].port, addresses[0].name))
-            return;
+          } else {
+            client.emit('error', new Error("Could not resolve hostname"));
           }
-          client.emit('error', 'Could not resolve server address');
           
         })
+        
       } else {
+        // Otherwise, just connect using the provided hostname and port
         client.setSocket(net.connect(options.port, options.host))
       }
+
+      
     }
+    
   }
+
 }