refactor: factorize process event between udp and tcp

lib/logstash/inputs/gelf.rb

@@ -149,9 +149,7 @@ def tcp_listener(output_queue)
             event = self.class.new_event(data_in, client.peeraddr[3])
             next if event.nil?
 
-            remap_gelf(event) if @remap
-            strip_leading_underscore(event) if @strip_leading_underscore
-            decorate(event)
+            process_event(event)
             output_queue << event
           end
 
@@ -206,9 +204,7 @@ def udp_listener(output_queue)
       event = self.class.new_event(data, client[3])
       next if event.nil?
 
-      remap_gelf(event) if @remap
-      strip_leading_underscore(event) if @strip_leading_underscore
-      decorate(event)
+      process_event(event)
 
       output_queue << event
     end
@@ -236,6 +232,12 @@ def self.new_event(json_gelf, host)
     event
   end
 
+  def process_event(event)
+    remap_gelf(event) if @remap
+    strip_leading_underscore(event) if @strip_leading_underscore
+    decorate(event)
+  end
+
   # transform a given timestamp value into a proper LogStash::Timestamp, preserving microsecond precision
   # and work around a JRuby issue with Time.at loosing fractional part with BigDecimal.
   # @param timestamp [Numeric] a Numeric (integer, float or bigdecimal) timestampo representation