96 lines
3.0 KiB
JavaScript
96 lines
3.0 KiB
JavaScript
"use strict";
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var zlib = require('zlib');
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var layouts = require('../layouts');
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var levels = require('../levels');
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var dgram = require('dgram');
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var util = require('util');
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var debug = require('../debug')('GELF Appender');
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var LOG_EMERG=0; // system is unusable
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var LOG_ALERT=1; // action must be taken immediately
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var LOG_CRIT=2; // critical conditions
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var LOG_ERR=3; // error conditions
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var LOG_ERROR=3; // because people WILL typo
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var LOG_WARNING=4; // warning conditions
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var LOG_NOTICE=5; // normal, but significant, condition
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var LOG_INFO=6; // informational message
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var LOG_DEBUG=7; // debug-level message
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var levelMapping = {};
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levelMapping[levels.ALL] = LOG_DEBUG;
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levelMapping[levels.TRACE] = LOG_DEBUG;
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levelMapping[levels.DEBUG] = LOG_DEBUG;
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levelMapping[levels.INFO] = LOG_INFO;
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levelMapping[levels.WARN] = LOG_WARNING;
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levelMapping[levels.ERROR] = LOG_ERR;
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levelMapping[levels.FATAL] = LOG_CRIT;
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/**
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* GELF appender that supports sending UDP packets to a GELF compatible server such as Graylog
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*
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* @param layout a function that takes a logevent and returns a string (defaults to none).
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* @param host - host to which to send logs (default:localhost)
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* @param port - port at which to send logs to (default:12201)
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* @param hostname - hostname of the current host (default:os hostname)
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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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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 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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function preparePacket(loggingEvent) {
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var msg = {};
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msg.full_message = layout(loggingEvent);
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msg.short_message = msg.full_message;
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msg.version="1.0";
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msg.timestamp = msg.timestamp || new Date().getTime() / 1000 >> 0;
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msg.host = hostname;
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msg.level = levelMapping[loggingEvent.level || levels.DEBUG];
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msg.facility = facility;
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return msg;
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}
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function sendPacket(packet) {
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try {
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client.send(packet, 0, packet.length, port, host);
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} catch(e) {}
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}
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return function(loggingEvent) {
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var message = preparePacket(loggingEvent);
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zlib.gzip(new Buffer(JSON.stringify(message)), function(err, packet) {
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if (err) {
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console.error(err.stack);
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} else {
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if (packet.length > 8192) {
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debug("Message packet length (" + packet.length + ") is larger than 8k. Not sending");
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} else {
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sendPacket(packet);
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}
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}
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});
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};
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}
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function configure(config) {
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var layout;
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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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}
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exports.appender = gelfAppender;
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exports.configure = configure;
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