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const TcpConnectionPool = require("./classes/TcpConnectionPool").TcpConnectionPool;
const tcpConnectionPool = new TcpConnectionPool();
let apm = false;
try {
apm = require('elastic-apm-node');
} catch(e) {
// ignore APM if it's not loaded
}
function sendLog(host, port, logObject) {
tcpConnectionPool.send(host, port, logObject);
}
function logstashTCP(config, layout) {
const type = config.logType ? config.logType : config.category;
Iif (!config.fields) {
config.fields = {};
}
function checkArgs(argsValue, logUnderFields) {
Eif ((!argsValue) || (argsValue === 'both')) {
return true;
}
if (logUnderFields && (argsValue === 'fields')) {
return true;
}
return (!logUnderFields) && (argsValue === 'direct');
}
function log(loggingEvent) {
let currentAPMTransaction = false
Iif(apm && apm.currentTransaction) {
currentAPMTransaction = apm.currentTransaction
}
/*
https://gist.github.com/jordansissel/2996677
{
'message' => 'hello world',
'@version' => '1',
'@timestamp' => '2014-04-22T23:03:14.111Z',
'type' => 'stdin',
'host' => 'hello.local'
}
@timestamp is the ISO8601 high-precision timestamp for the event.
@version is the version number of this json schema
Every other field is valid and fine.
*/
const fields = {};
Object.keys(config.fields).forEach((key) => {
fields[key] = typeof config.fields[key] === 'function' ? config.fields[key](loggingEvent) : config.fields[key];
});
// adding context to log messages as separate fields added by logger.addContext(key, value)
if(loggingEvent.context) {
if(loggingEvent.data.length === 1 || !loggingEvent.data[1]) {
loggingEvent.data[1] = {}
}
Eif(typeof loggingEvent.data[1] === 'object') {
loggingEvent.data[1] = {
...loggingEvent.context,
...loggingEvent.data[1]
}
}
}
/* eslint no-prototype-builtins:1,no-restricted-syntax:[1, "ForInStatement"] */
if (loggingEvent.data.length > 1) {
const secondEvData = loggingEvent.data[1];
Eif ((secondEvData !== undefined) && (secondEvData !== null)) {
Object.keys(secondEvData).forEach((key) => {
fields[key] = secondEvData[key];
})
;
}
}
fields.level = loggingEvent.level.levelStr;
fields.category = loggingEvent.categoryName;
const logObject = {
'@version': '1',
'@timestamp': (new Date(loggingEvent.startTime)).toISOString(),
// this allows to show logs generated by logging events together with APM events
...(currentAPMTransaction.ids || {}),
type: type,
message: layout(loggingEvent)//.data[0]
};
Eif (checkArgs(config.args, false)) {
Object.keys(fields).forEach((key) => {
logObject[key] = fields[key];
});
}
sendLog(config.host, config.port, logObject);
}
log.shutdown = function (cb) {
tcpConnectionPool.close(cb);
};
return log;
}
function configure(config, layouts) {
let layout = layouts.dummyLayout;
Iif (config.layout) {
layout = layouts.layout(config.layout.type, config.layout);
}
Iif(!layout) {
throw new Error('wrong and/or unknown layout chosen in log4js configuration', config.layout);
}
return logstashTCP(config, layout);
}
module.exports.configure = configure;
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