exposed errors for checkPortStatus

lib/portscanner.js

@@ -56,6 +56,7 @@ portscanner.checkPortStatus = function(port, host, callback) {
   host = host || 'localhost'
   var socket = new Socket()
     , status = null
+    , error = null
 
   // Socket connection established, port is open
   socket.on('connect', function() {
@@ -64,21 +65,25 @@ portscanner.checkPortStatus = function(port, host, callback) {
   })
 
   // If no response, assume port is not listening
-  socket.setTimeout(400)
+  timeout = 400
+  socket.setTimeout(timeout)
   socket.on('timeout', function() {
     status = 'closed'
+    error = new Error('Timeout (' + timeout + 'ms) occurred waiting for ' + host + ':' + port + ' to be available')
     socket.destroy()
   })
 
   // Assuming the port is not open if an error. May need to refine based on
   // exception
   socket.on('error', function(exception) {
+    error = exception
     status = 'closed'
   })
 
   // Return after the socket has closed
   socket.on('close', function(exception) {
-    callback(null, status)
+    if (exception) error = exception
+    callback(error, status)
   })
 
   socket.connect(port, host)