Added UUID to payload

- closes snowplow#244

Author: fblundun

core/CHANGELOG

@@ -1,5 +1,6 @@
 Version 0.2.0 (2014-08-xx)
 --------------------------
+Added UUID to payload (#244)
 Added automatic timestamp generation (#243)
 Added setter methods (#242)
 Added timestamp parameter to tracker methods (#240)

core/lib/core.js

@@ -14,6 +14,7 @@
  */
 
 var payload = require('./payload.js');
+var uuid = require('uuid');
 
 module.exports = function trackerCore(base64, callback) {
 
@@ -77,6 +78,7 @@ module.exports = function trackerCore(base64, callback) {
 	 */
 	function track(sb, context, tstamp) {
 		sb.addDict(payloadPairs);
+		sb.add('eid', uuid.v4());
 		sb.add('dtm', tstamp || new Date().getTime());
 		if (context) {
 			sb.addJson('cx', 'co', completeContexts(context));			

core/package.json

@@ -24,6 +24,7 @@
   ],
   "license": "Apache-2.0",
   "dependencies": {
-    "JSON": "^1.0.0"
+    "JSON": "^1.0.0",
+    "uuid": "^1.4.1"
   }
 }

core/tests/core.js

@@ -24,6 +24,8 @@ define([
 	var tracker = core(false);
 
 	function compare(result, expected, message) {
+		assert.ok(result['eid'], 'A UUID should be attached to all events');
+		delete result['eid'];
 		assert.ok(result['dtm'], 'A timestamp should be attached to all events');
 		delete result['dtm'];
 		assert.deepEqual(result, expected, message);