ninwa/libs/logger.js

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2022-02-15 04:33:19 +01:00
const config = require('../config.json');
const moment = require('moment');
// constants
const LOG_PREFIX_DEBUG = 'debug';
const LOG_PREFIX_INFO = 'info';
const LOG_PREFIX_WARNING = 'warning';
const LOG_PREFIX_ERROR = 'error';
const LOGLEVEL_DEBUG = 0;
const LOGLEVEL_INFO = 1;
const LOGLEVEL_WARNING = 2;
const LOGLEVEL_ERROR = 3;
// set loglevel on 'require'
const loglevel = function () {
switch (config.log.level) {
case LOG_PREFIX_DEBUG:
case LOGLEVEL_DEBUG:
return LOGLEVEL_DEBUG;
case LOG_PREFIX_INFO:
case LOGLEVEL_INFO:
return LOGLEVEL_INFO;
case LOG_PREFIX_WARNING:
case LOGLEVEL_WARNING:
return LOGLEVEL_WARNING;
case LOG_PREFIX_ERROR:
case LOGLEVEL_ERROR:
return LOGLEVEL_ERROR;
default:
return LOGLEVEL_INFO;
}
}();
// prefix log with 'info'
function info(message) {
if (loglevel > LOGLEVEL_INFO) {
return;
}
trace(message);
}
// prefix log with 'info'
function warn(message) {
if (loglevel > LOGLEVEL_WARNING) {
return;
}
trace(message, 'warning');
}
// prefix log with 'debug'
function debug(message) {
if (loglevel > LOGLEVEL_DEBUG) {
return;
}
trace(message, 'debug');
}
// prefix log with 'error'
function error(message) {
if (loglevel > LOGLEVEL_ERROR) {
return;
}
trace(message, 'error');
}
// default logging function
function trace(message, prefix) {
if (message === undefined || message === null || message.length === 0) {
return;
}
if (prefix === undefined || prefix === null || prefix.length === 0) {
prefix = 'info';
}
let print;
switch (prefix) {
case 'error':
print = console.error;
break;
case 'debug':
print = console.debug;
break;
case 'warning':
print = console.warn;
break;
default:
print = console.log;
}
message = moment().format(config.log.timestamp) + ' | ' + prefix + ' > ' + message;
print(message);
}
// exports
module.exports = {
info,
warn,
debug,
error
};