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@ -35,21 +35,67 @@ levelMapping[levels.FATAL] = LOG_CRIT;
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* @param facility - facility to log to (default:nodejs-server)
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*/
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function gelfAppender (layout, host, port, hostname, facility) {
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var config, customFields;
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if (typeof(host) === 'object') {
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config = host;
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host = config.host;
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port = config.port;
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hostname = config.hostname;
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facility = config.facility;
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customFields = config.customFields;
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}
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host = host || 'localhost';
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port = port || 12201;
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hostname = hostname || require('os').hostname();
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facility = facility || 'nodejs-server';
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layout = layout || layouts.messagePassThroughLayout;
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var defaultCustomFields = customFields || {};
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var client = dgram.createSocket("udp4");
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process.on('exit', function() {
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if (client) client.close();
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});
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/**
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* Add custom fields (start with underscore )
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* - if the first object passed to the logger contains 'GELF' field,
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* copy the underscore fields to the message
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* @param loggingEvent
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* @param msg
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*/
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function addCustomFields(loggingEvent, msg){
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/* append defaultCustomFields firsts */
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Object.keys(defaultCustomFields).forEach(function(key) {
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// skip _id field for graylog2, skip keys not starts with UNDERSCORE
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if (key.match(/^_/) && key !== "_id") {
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msg[key] = defaultCustomFields[key];
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}
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});
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/* append custom fields per message */
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var data = loggingEvent.data;
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if (!Array.isArray(data) || data.length === 0) return;
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var firstData = data[0];
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if (!firstData.GELF) return; // identify with GELF field defined
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Object.keys(firstData).forEach(function(key) {
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// skip _id field for graylog2, skip keys not starts with UNDERSCORE
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if (key.match(/^_/) || key !== "_id") {
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msg[key] = firstData[key];
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}
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});
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/* the custom field object should be removed, so it will not be looged by the later appenders */
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loggingEvent.data.shift();
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}
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function preparePacket(loggingEvent) {
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var msg = {};
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addCustomFields(loggingEvent, msg);
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msg.full_message = layout(loggingEvent);
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msg.short_message = msg.full_message;
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@ -88,7 +134,7 @@ function configure(config) {
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if (config.layout) {
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layout = layouts.layout(config.layout.type, config.layout);
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}
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return gelfAppender(layout, config.host, config.port, config.hostname, config.facility);
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return gelfAppender(layout, config);
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}
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exports.appender = gelfAppender;
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