resolved merge conflict

lib/RequestHandler.go

@@ -44,7 +44,7 @@ func ClickstreamProtobufEventHandler(request RequestObject, topic string) {
 	//getting the client which has sent this event
 	var result map[string]interface{}
 	json.Unmarshal(messageBytes, &result)
-	source := result["source"].(string)
+	source := getSource(result)
 	//log.Print(source)
 	// to be of the format [magicByte] + [schemaID] + [messageIndex] + [value]
 	recordValue := []byte{}
@@ -79,7 +79,7 @@ func ClickstreamJsonEventHandler(request RequestObject, topic string) {
 	//getting the client which has sent this event
 	var result map[string]interface{}
 	json.Unmarshal(messageBytes, &result)
-	source := result["source"].(string)
+	source := getSource(result)
 
 	// to be of the format [magicByte] + [schemaID] + [messageIndex] + [value]
 	recordValue := []byte{}
@@ -105,3 +105,10 @@ func ClickstreamJsonEventHandler(request RequestObject, topic string) {
 	metrics.EventProcessingTimeHist.WithLabelValues(topic, source).Observe(float64(utils.NanosToMillis(time.Now().UnixNano()) - eventProcessingStartTime))
 	producer_module.WriteMessageToKafkaAsync(message, source)
 }
+
+func getSource(event map[string]interface{}) string {
+	if event["source"] == nil {
+		return "UNKNOWN"
+	}
+	return event["source"].(string)
+}