Currently, I am using express with log4js module like this, in any route file:
var log = require('log4jslogger.js').LOG;
log.info('this is log statement');
logger.js
var log4js = require('log4js');
log4js.configure(__base + "log4jsconfig.json");
var logger = log4js.getLogger('default');
Object.defineProperty(exports, "LOG", {
value : logger,
});
logs4jsconfig.json
{
"appenders": {
"out": {
"type": "stdout"
},
"default": {
"type": "dateFile",
"filename": "logs/default",
"pattern": "-yyyy-MM-dd.log",
"alwaysIncludePattern": true,
"keepFileExt": true
}
},
"categories": {
"default": {
"appenders": ["out",
"default"],
"level": "trace"
}
}
}
I want to add logged [username]
or [unauthenticated]
in all log statements. which I can get like req.user.id
.
How can we do this instead of adding this to all log statements?
In log4js docs, I found a use of layout using a token but did not get clearly how to form AuthLibrary.currentUser()
const currentUser = require("./authLibrary").currentUser;
log4js.configure({
replaceConsole: true,
appenders: {
stdout: {
type: 'console',
layout: {
type: "pattern",
pattern: "%d %p %c %x{user} %m%n",
tokens: {
user: function (logEvent) {
return `[auth:${currentUser().UserName || '-'} / ${currentUser().UserId || '-'}]`;
},
},
},
}
},
categories: { default: { appenders: ['stdout'], level: 'info' }, },
});
// authLibrary.js
let user = {};
const setCurrentUser = (_user) => {
user = _user;
}
const currentUser = () => user;
module.exports = { currentUser, setCurrentUser };
// test
(async (err, req, res, next) => {
const token = req.get('token')
const user = await authService(token)
req.currentUser = user;
require("../utils/authLibrary").setCurrentUser(user);
})(null, { get: (x) => "1697E29ADE8DA9F6F84E214CF66E" }, null, null)
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