winston logging to separate files - node.js

Question

I'm new in node.js and have such winson config
const winston = require('winston');
const transports = [];
if (process.env.NODE_ENV !== 'development') {
transports.push(new (winston.transports.DailyRotateFile)({
filename: path.resolve(__dirname, '../logs/%DATE%/source1.log'),
level: 'info',
datePattern: 'YYYY-MM-DD',
}));
transports.push(new (winston.transports.DailyRotateFile)({
filename: path.resolve(__dirname, '../logs/%DATE%/source2.log'),
level: 'info',
datePattern: 'YYYY-MM-DD',
}));
}
let logger = winston.createLogger({
level: 'info',
format: winston.format.json(),
transports,
exitOnError: true,
});
logger.log({
date: (new Date()).toString(),
level,
message,
source,
});
and I need logging to separate files depend on source (all source1 logs in file ../logs/%DATE%/source1.log' and same with source2)
How can do this?

Answer 1

by GoogleTraduction FR -> EN
Hello !
If you want your logs to be separated into several separate files I can offer you the following solution.
Note: this solution is based on log levels.
Winston: 3.0.0
Nodejs: 9.3.0
./logger/index.js
const winston = require('winston');
module.exports = (dirname) => {
const loggers = {
info: null,
warn: null,
query: null,
errDat: null,
errFun: null,
errInt: null,
};
for (let level of Object.keys(loggers)) {
loggers[level] = winston.createLogger({
levels: { [level]: 0 },
format: winston.format.combine(
winston.format.timestamp(),
winston.format.printf(info =>
`${info.timestamp}\t[${info.level}]\t${info.message}`
),
),
transports: [
new winston.transports.Console({
level
}),
new winston.transports.File({
dirname,
filename: `${level}.log`,
level,
format: winston.format.json(),
}),
]
})[level];
}
return loggers;
};
Other file
const path = require('path');
const { info, query, errInt, errDat, errFun } = require('./logger')(
path.join(__dirname, 'logs')
);
info(`Test`);
query(`Test`);
errDat(`Test`);
errInt(`Test`);
errFun(`Test`);