don't emit 'error' for non-fatal errors

README.md

@@ -45,10 +45,14 @@ var port = 6881
 
 var client = new Client(peerId, port, parsedTorrent)
 
-// you must add an 'error' event handler!
 client.on('error', function (err) {
+  // fatal client error!
   console.log(err.message)
+})
+
+client.on('warning', function (err) {
   // a tracker was unavailable or sent bad data to the client. you can probably ignore it
+  console.log(err.message)
 })
 
 // start getting peers from the tracker

client.js

@@ -388,7 +388,8 @@ Tracker.prototype._requestUdp = function (requestUrl, opts) {
   }
 
   function error (message) {
-    self.client.emit('error', new Error(message + ' (connecting to tracker ' + requestUrl + ')'))
+    // errors will often happen if a tracker is offline, so don't treat it as fatal
+    self.client.emit('warning', new Error(message + ' (' + requestUrl + ')'))
     cleanup()
   }
 
@@ -443,7 +444,7 @@ Tracker.prototype._handleResponse = function (requestUrl, data) {
   try {
     data = bencode.decode(data)
   } catch (err) {
-    return self.client.emit('error', new Error('Error decoding tracker response: ' + err.message))
+    return self.client.emit('warning', new Error('Error decoding tracker response: ' + err.message))
   }
   var failure = data['failure reason']
   if (failure) {