log4js-node/lib/appenders/multiprocess.js

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var log4js = require('../log4js');
var layouts = require('../layouts');
var net = require('net');
var util = require('util');
var LogServer = function createLogServer(config) {
var actualAppender = config.actualAppender;
var server = net.createServer(function serverCreated(clientSocket) {
clientSocket.on('connect', function clientConnected() {
var logMessage = '';
clientSocket.on('data', function chunkReceived(chunk) {
logMessage += chunk;
});
clientSocket.on('end', function gotChunks() {
try {
var loggingEvent = JSON.parse(logMessage);
deserializeLoggingEvent(loggingEvent);
actualAppender(loggingEvent);
} catch (e) {
// JSON.parse failed, just log the contents probably a naughty.
actualAppender(createLoggingEvent('ERROR', 'Unable to parse log: ' + logMessage));
}
})
});
});
server.listen(config.loggerPort || 5000, config.loggerHost || 'localhost');
}
function createLoggingEvent(level, message) {
return {
startTime: new Date(),
categoryName: 'log4js',
level: { toString: function () {
return level;
}},
data: [ message ]
};
}
function deserializeLoggingEvent(loggingEvent) {
loggingEvent.startTime = new Date(loggingEvent.startTime);
loggingEvent.level.toString = function levelToString() {
return loggingEvent.level.levelStr;
};
}
function workerAppender(config) {
return function log(loggingEvent) {
var socket = net.createConnection(config.loggerPort || 5000, config.loggerHost || 'localhost');
socket.on('connect', function socketConnected() {
socket.end(JSON.stringify(loggingEvent), 'utf8');
});
};
}
function createAppender(config) {
if (config.mode === 'master') {
var server = new LogServer(config);
return config.actualAppender;
} else {
return workerAppender(config);
}
}
function configure(config) {
var actualAppender;
if (config.appender && config.mode === 'master') {
log4js.loadAppender(config.appender.type);
actualAppender = log4js.appenderMakers[config.appender.type](config.appender);
config.actualAppender = actualAppender;
}
return createAppender(config);
}
exports.name = 'multiprocess';
exports.appender = createAppender;
exports.configure = configure;