Fix undefined issue while logging from node-loggly-bulk library

lib/loggly/client.js

@@ -28,14 +28,20 @@ function stringify(msg) {
 //
 // function to truncate message over 1 MB
 // 
-function truncateLargeMessage(message) {  
+function truncateLargeMessage(message) {
   var maximumBytesAllowedToLoggly = EVENT_SIZE;
-  var bytesLengthOfLogMessage = Buffer.byteLength(message); 
+  var bytesLengthOfLogMessage = Buffer.byteLength(message);
+  var isMessageTruncated = false;
   if(bytesLengthOfLogMessage > maximumBytesAllowedToLoggly) {
     message = message.slice(0, maximumBytesAllowedToLoggly);
+    isMessageTruncated = true;
   }
-  return message;
+  return {
+    message: message,
+    isMessageTruncated: isMessageTruncated
+  };
 }
+
 //
 // function createClient (options)
 //   Creates a new instance of a Loggly client.
@@ -105,7 +111,18 @@ util.inherits(Loggly, events.EventEmitter);
 //  - http://www.loggly.com/docs/api-sending-data/
 //
 Loggly.prototype.log = function (msg, tags, callback) {
-  msg.message = truncateLargeMessage(msg.message)
+  // typeof msg is string when we are using node-loggly-bulk to send logs.
+  // If we are sending logs using winston-loggly-bulk, msg is object.
+  // Check if 'msg' is an object, if yes then stringify it to truncate it over 1MB.
+  var truncatedMessageObject = null;
+  if(typeof(msg) === 'object'){
+    var stringifiedMessage = JSON.stringify(msg)
+    truncatedMessageObject = truncateLargeMessage(stringifiedMessage);
+    msg = truncatedMessageObject.isMessageTruncated ? truncatedMessageObject.message : msg;
+  }else if (typeof(msg) === 'string') {
+    truncatedMessageObject = truncateLargeMessage(msg);
+    msg = truncatedMessageObject.isMessageTruncated ? truncatedMessageObject.message : msg;
+  }
   if (!callback && typeof tags === 'function') {
     callback = tags;
     tags = null;