clustered.js
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"use strict";
var cluster = require('cluster');
var log4js = require('../log4js');
/**
* Takes a loggingEvent object, returns string representation of it.
*/
function serializeLoggingEvent(loggingEvent) {
// JSON.stringify(new Error('test')) returns {}, which is not really useful for us.
// The following allows us to serialize errors correctly.
for (var i = 0; i < loggingEvent.data.length; i++) {
var item = loggingEvent.data[i];
// Validate that we really are in this case
if (item && item.stack && JSON.stringify(item) === '{}') {
loggingEvent.data[i] = {stack : item.stack};
}
}
return JSON.stringify(loggingEvent);
}
/**
* Takes a string, returns an object with
* the correct log properties.
*
* This method has been "borrowed" from the `multiprocess` appender
* by `nomiddlename`
* (https://github.com/nomiddlename/log4js-node/blob/master/lib/appenders/multiprocess.js)
*
* Apparently, node.js serializes everything to strings when using `process.send()`,
* so we need smart deserialization that will recreate log date and level for further
* processing by log4js internals.
*/
function deserializeLoggingEvent(loggingEventString) {
var loggingEvent;
try {
loggingEvent = JSON.parse(loggingEventString);
loggingEvent.startTime = new Date(loggingEvent.startTime);
loggingEvent.level = log4js.levels.toLevel(loggingEvent.level.levelStr);
// Unwrap serialized errors
for (var i = 0; i < loggingEvent.data.length; i++) {
var item = loggingEvent.data[i];
if (item && item.stack) {
loggingEvent.data[i] = item.stack;
}
}
} catch (e) {
// JSON.parse failed, just log the contents probably a naughty.
loggingEvent = {
startTime: new Date(),
categoryName: 'log4js',
level: log4js.levels.ERROR,
data: [ 'Unable to parse log:', loggingEventString ]
};
}
return loggingEvent;
}
/**
* Creates an appender.
*
* If the current process is a master (`cluster.isMaster`), then this will be a "master appender".
* Otherwise this will be a worker appender, that just sends loggingEvents to the master process.
*
* If you are using this method directly, make sure to provide it with `config.actualAppenders`
* array of actual appender instances.
*
* Or better use `configure(config, options)`
*/
function createAppender(config) {
if (cluster.isMaster) {
var masterAppender = function(loggingEvent) {
if (config.actualAppenders) {
var size = config.actualAppenders.length;
for(var i = 0; i < size; i++) {
if (
!config.appenders[i].category ||
config.appenders[i].category === loggingEvent.categoryName
) {
// Relying on the index is not a good practice but otherwise
// the change would have been bigger.
config.actualAppenders[i](loggingEvent);
}
}
}
};
// Listen on new workers
cluster.on('fork', function(worker) {
worker.on('message', function(message) {
if (message.type && message.type === '::log-message') {
var loggingEvent = deserializeLoggingEvent(message.event);
// Adding PID metadata
loggingEvent.pid = worker.process.pid;
loggingEvent.cluster = {
master: process.pid,
worker: worker.process.pid,
workerId: worker.id
};
masterAppender(loggingEvent);
}
});
});
return masterAppender;
} else {
return function(loggingEvent) {
// If inside the worker process, then send the logger event to master.
if (cluster.isWorker) {
// console.log("worker " + cluster.worker.id + " is sending message");
process.send({ type: '::log-message', event: serializeLoggingEvent(loggingEvent)});
}
};
}
}
function configure(config, options) {
if (config.appenders && cluster.isMaster) {
var size = config.appenders.length;
config.actualAppenders = new Array(size);
for(var i = 0; i < size; i++) {
log4js.loadAppender(config.appenders[i].type);
config.actualAppenders[i] = log4js.appenderMakers[config.appenders[i].type](
config.appenders[i],
options
);
}
}
return createAppender(config);
}
exports.appender = createAppender;
exports.configure = configure;