/
example.js
50 lines (43 loc) · 1.72 KB
/
example.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
'use strict';
const log4js = require('../lib/log4js');
// log the cheese logger messages to a file, and the console ones as well.
log4js.configure({
appenders: {
cheeseLogs: { type: 'file', filename: 'cheese.log' },
console: { type: 'console' },
},
categories: {
cheese: { appenders: ['cheeseLogs'], level: 'error' },
another: { appenders: ['console'], level: 'trace' },
default: { appenders: ['console', 'cheeseLogs'], level: 'trace' },
},
});
// a custom logger outside of the log4js/lib/appenders directory can be accessed like so
// log4js.configure({
// appenders: { outside: { type: 'what/you/would/put/in/require', otherArgs: 'blah' } }
// ...
// });
const logger = log4js.getLogger('cheese');
// only errors and above get logged.
const otherLogger = log4js.getLogger();
// this will get coloured output on console, and appear in cheese.log
otherLogger.error('AAArgh! Something went wrong', {
some: 'otherObject',
useful_for: 'debug purposes',
});
otherLogger.log('This should appear as info output');
// these will not appear (logging level beneath error)
logger.trace('Entering cheese testing');
logger.debug('Got cheese.');
logger.info('Cheese is Gouda.');
logger.log('Something funny about cheese.');
logger.warn('Cheese is quite smelly.');
// these end up only in cheese.log
logger.error('Cheese %s is too ripe!', 'gouda');
logger.fatal('Cheese was breeding ground for listeria.');
// these don't end up in cheese.log, but will appear on the console
const anotherLogger = log4js.getLogger('another');
anotherLogger.debug('Just checking');
// will also go to console and cheese.log, since that's configured for all categories
const pantsLog = log4js.getLogger('pants');
pantsLog.debug('Something for pants');