From 5b2d840472c331c647b69b39196ebd66a49c7388 Mon Sep 17 00:00:00 2001
From: Jens John <dev@2ion.de>
Date: Thu, 10 Jul 2014 14:07:38 +0900
Subject: [PATCH] GELF appender: move facility key into a custom field if
 present

At the same time, don't assign a default value as the field is optional
according to the GELF spec v1.1.
---
 lib/appenders/gelf.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/appenders/gelf.js b/lib/appenders/gelf.js
index 8e075b5..e536462 100644
--- a/lib/appenders/gelf.js
+++ b/lib/appenders/gelf.js
@@ -48,7 +48,9 @@ function gelfAppender (layout, host, port, hostname, facility) {
   host = host || 'localhost';
   port = port || 12201;
   hostname = hostname || require('os').hostname();
-  facility = facility || 'nodejs-server';
+  if(facility) {
+    customFields['_facility'] = facility;
+  }
   layout = layout || layouts.messagePassThroughLayout;
 
   var defaultCustomFields = customFields || {};
@@ -103,7 +105,6 @@ function gelfAppender (layout, host, port, hostname, facility) {
     msg.timestamp = msg.timestamp || new Date().getTime() / 1000; // log should use millisecond 
     msg.host = hostname;
     msg.level = levelMapping[loggingEvent.level || levels.DEBUG];
-    msg.facility = facility;
     return msg;
   }