118 lines
3.2 KiB
JavaScript
118 lines
3.2 KiB
JavaScript
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"use strict";
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var cluster = require('cluster');
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var log4js = require('../log4js');
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/**
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* Takes a loggingEvent object, returns string representation of it.
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*/
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function serializeLoggingEvent(loggingEvent) {
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return JSON.stringify(loggingEvent);
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}
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/**
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* Takes a string, returns an object with
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* the correct log properties.
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*
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* This method has been "borrowed" from the `multiprocess` appender
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* by `nomiddlename` (https://github.com/nomiddlename/log4js-node/blob/master/lib/appenders/multiprocess.js)
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*
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* Apparently, node.js serializes everything to strings when using `process.send()`,
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* so we need smart deserialization that will recreate log date and level for further processing by log4js internals.
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*/
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function deserializeLoggingEvent(loggingEventString) {
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var loggingEvent;
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try {
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loggingEvent = JSON.parse(loggingEventString);
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loggingEvent.startTime = new Date(loggingEvent.startTime);
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loggingEvent.level = log4js.levels.toLevel(loggingEvent.level.levelStr);
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} catch (e) {
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// JSON.parse failed, just log the contents probably a naughty.
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loggingEvent = {
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startTime: new Date(),
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categoryName: 'log4js',
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level: log4js.levels.ERROR,
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data: [ 'Unable to parse log:', loggingEventString ]
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};
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}
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return loggingEvent;
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}
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/**
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* Creates an appender.
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*
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* If the current process is a master (`cluster.isMaster`), then this will be a "master appender".
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* Otherwise this will be a worker appender, that just sends loggingEvents to the master process.
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*
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* If you are using this method directly, make sure to provide it with `config.actualAppenders` array
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* of actual appender instances.
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*
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* Or better use `configure(config, options)`
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*/
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function createAppender(config) {
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if (cluster.isMaster) {
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var masterAppender = function(loggingEvent) {
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if (config.actualAppenders) {
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var size = config.actualAppenders.length;
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for(var i = 0; i < size; i++) {
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config.actualAppenders[i](loggingEvent);
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}
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}
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}
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// Listen on new workers
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cluster.on('fork', function(worker) {
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worker.on('message', function(message) {
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if (message.type && message.type === '::log-message') {
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// console.log("master : " + cluster.isMaster + " received message: " + JSON.stringify(message.event));
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var loggingEvent = deserializeLoggingEvent(message.event);
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masterAppender(loggingEvent);
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}
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});
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});
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return masterAppender;
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} else {
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return function(loggingEvent) {
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// If inside the worker process, then send the logger event to master.
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if (cluster.isWorker) {
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// console.log("worker " + cluster.worker.id + " is sending message");
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process.send({ type: '::log-message', event: serializeLoggingEvent(loggingEvent)});
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}
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}
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}
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}
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function configure(config, options) {
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if (config.appenders && cluster.isMaster) {
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var size = config.appenders.length;
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config.actualAppenders = new Array(size);
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for(var i = 0; i < size; i++) {
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log4js.loadAppender(config.appenders[i].type);
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config.actualAppenders[i] = log4js.appenderMakers[config.appenders[i].type](config.appenders[i], options);
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}
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}
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return createAppender(config);
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}
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exports.appender = createAppender;
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exports.configure = configure;
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