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Custom Logger Library with winston
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const { createLogger, format, transports } = require('winston') | |
const moment = require('moment') | |
// set default log level. | |
const logLevel = 'info' | |
var logger = createLogger({ | |
level: logLevel, | |
levels: { | |
fatal: 0, | |
crit: 1, | |
warn: 2, | |
info: 3, | |
debug: 4, | |
trace: 5 | |
}, | |
format: format.combine( | |
format.prettyPrint(), | |
format.timestamp({ | |
format: 'DD-MM-YYYY hh:mm:ss A' | |
}), | |
format.printf(nfo => { | |
return `${nfo.timestamp} - ${nfo.level}: ${nfo.message}` | |
}) | |
), | |
transports: [ | |
new transports.Console(), | |
new transports.File({ | |
filename: 'bot.log' | |
}) | |
] | |
}) | |
// Extend logger object to properly log 'Error' types | |
var origLog = logger.log | |
logger.log = function (level, msg) { | |
if (msg instanceof Error) { | |
var args = Array.prototype.slice.call(arguments) | |
args[1] = msg.stack | |
origLog.apply(logger, args) | |
} else { | |
origLog.apply(logger, arguments) | |
} | |
} | |
/* LOGGER EXAMPLES | |
var log = require('./log.js') | |
log.trace('testing') | |
log.debug('testing') | |
log.info('testing') | |
log.warn('testing') | |
log.crit('testing') | |
log.fatal('testing') | |
*/ | |
module.exports = logger | |
= |
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